KR200293086Y1 - Environmentally Friendly Sewage Treatment Equipment - Google Patents

Abstract

The present invention has a volume for storing the sewage introduced into the sump (2), the sewage tank 2, the aerobic tank 20 and the aerobic tank 20 for treating the sewage in an aerobic atmosphere An anaerobic tank 50 having an anaerobic atmosphere is formed at the bottom of the bottom surface, and the aerobic tank 20 has a first height 52 and a predetermined height thereon for preventing sewage leakage from the bottom and the perimeter. The aggregate layer 31 in which the gravel and sand are laminated, the plant 22 planted on the aggregate layer 31, and the aggregate layer 31 under the aggregate layer 31 on which the plant 22 is planted ( At least one horizontal tube pipe 26 and the horizontal tube pipe buried in order to provide a movement path of the treated primary treated water through 31 and to supply oxygen to the aggregate layer 31 and the plant 22. 26) is connected to one side of the other side of the opposite side is open to the atmosphere At least one or more vertical pipes 24 through which air is introduced from the air, and installed in the horizontal pipes 26 to move the primary treated water collected into the horizontal pipes 26 to the anaerobic tank 50. Treated water inlet pipe 32, the anaerobic tank 50 is the treated water to guide the first treated water passing through the treated water inlet pipe 32 of the aerobic tank 20 to the anaerobic tank 50 Second treatment membrane 52 ′ provided to prevent discharge of the primary treatment water discharged from the treated water discharge pipe 36 and the discharge pipe 36 and the bottom and the circumference, and the primary treated water introduced from the treated water discharge pipe 36. It relates to a sewage treatment device comprising a partition 54 for guiding the flow path of the discharge, the discharge pipe 58 to move along the partition 54 and discharge the treated secondary treated water to the outside.

According to the present invention, pumps, agitators, blowers, etc., which are required in a general sewage treatment apparatus, are not required, and a professional operator who manages the devices is unnecessary, so that initial investment and maintenance costs are low, as well as a machine using power. Since there is no device, the interruption of sewage treatment due to a failure does not occur.

Description

Nature Friendly Sewage Treatment Equipment {Environmentally Friendly Sewage Treatment Equipment}

The present invention relates to an apparatus for treatment of domestic sewage, and more particularly, sewage is passed through a sand layer and a gravel layer where plants are planted to treat sewage using microorganisms present in the sand layer and gravel layer, and using the microorganisms. The present invention relates to a sewage treatment apparatus for treating sewage treated by inflow into a treatment tank having anaerobic treatment.

Due to the improvement of national living standards and industrial advancement, the amount of sewage and sewage such as living sewage, industrial waste, and livestock waste is rapidly increasing, polluting rivers, lakes and coastal waters, resulting in water pollution such as eutrophication, green algae and red tide. I'm making it.

The sources of these water pollutants are largely divided into point sources and nonpoint sources. The point sources include domestic sewage and industrial wastewater, and the nonpoint sources include rainfall drainage in forest areas and agricultural drainage in agricultural lands. Major water pollution sources account for about 60% of all pollutant sources, centering on domestic sewage.

For this reason, various kinds of sewage, industrial wastewater, and livestock wastewater from various household sewage and manure septic tanks are regulated to be discharged under the condition that BOD (biological oxygen demand) is discharged at all times due to environmental pollution. To this end, it is mandatory to install sewage and wastewater purification treatment devices in factories or large apartment complexes that discharge various sewage and wastewater, and if they are discharged without proper purification, they will seriously destroy the ecosystem. do.

The above-mentioned treatment equipment for sewage and sewage and wastewater purification is operated as a large-scale end-of-life treatment facility where an end-of-life treatment plant is installed and domestic sewage discharged from each home is collected and treated by sewage pipes. Also, the water quality of rivers, lakes and coasts is not easily improved, but deterioration is occurring, and leaks of sewage through the sewage pipes of sewage pipes and groundwater and seawater flow into the pipelines are pointed out that the sewage is not treated stably.

As a result, village-scale sewage treatment in village-scale sewage treatment around large-scale terminal treatment plants is expected to increase significantly in the future. Such a village-scale sewage treatment facility is usually 30 to 300m ³ / day, and there is a limitation that it must be operated unmanned because the burden of labor costs is very high to operate with a professional driver.

In addition, due to the absence of professional manpower, there is a problem that it is difficult to manage power facilities such as blowers, sewage and sludge that are used in various sewage treatment devices, pumps and agitators.

On the other hand, the treatment equipment for sewage and wastewater purification used up to now uses a biological treatment process to decompose contaminants by microorganisms. This is a typical floating biotreatment process known as activated sludge process, in which microorganisms float with sewage and decompose pollutants while consuming oxygen in the air supplied to the sewage. Sludge swelling occurs frequently during operation, resulting in a large amount of surplus sludge. It is difficult to cope with large load fluctuations, excessive maintenance costs due to continuous aeration and agitation, and long restart times due to sudden stops such as emergency stops.

In order to overcome the above-mentioned problems, a process for treating sewage and wastewater with a natural purification system that reduces the use of power, reduces maintenance costs, and does not require professional operation personnel, has been developed.

U.S. Patent No. 4,971,690 guides sewage and wastewater to a strata through a series of pipes, and sewage and wastewater directed to the top of the strata flows to the bottom of the strata, causing contaminants to be treated and treated. The method of collecting water is described through a collection pipe installed at the bottom of the strata.

On the other hand, the Republic of Korea Utility Model Publication No. 1998-0002862 plant plant in a volume of land that can sufficiently store the sewage, and the sewage is purified by sequentially passing the sewage from the upper layer of the ground where the plant is planted, the purification An apparatus for treating and discharging sewage into a water tank where water plants are planted in a predetermined volume of land is described.

However, in the case of the natural purification system of the method there is no way to remove the nitrogen and phosphorus when the wastewater, including nitrogen and phosphorus, etc. is introduced, the scope of application is limited according to the characteristics of sewage and wastewater. For example, a large amount of sewage discharged from pollutants increases the area of land required to treat the sewage.

In order to overcome this problem, the Republic of Korea Utility Model Registration No. 00273571 improves the ecological efficiency of planted aquatic plants by laying natural fiber mats on top of the filter media layer consisting of sand and gravel of artificial wetlands, and drawing sludge under the filter media layer. Install a tube to draw sludge if necessary, install an acid induction pipe in the vertical direction in the filter medium layer and install an aeration device in the acid induction pipe to supply oxygen to form a swirl flow in the artificial wetland layer Sewage and wastewater treatment systems comprising plants, filtration layers and aeration systems are described.

However, in order to treat nitrogen and phosphorus, an advanced treatment method consisting of an anaerobic tank, a flow regulating tank, an aeration tank, an anoxic tank, a contact aeration tank, and a final sedimentation tank should be introduced. When the advanced treatment method is introduced, the wastewater treatment apparatus is maintained. Too much cost is required, and there is a problem that a professional driver must always reside in the wastewater treatment system.

Therefore, it is urgent to develop an unmanned manpower and an advanced treatment process that can effectively remove not only domestic sewage but also organic pollutants represented by BOD and COD and nitrogen and phosphorus, which are eutrophication causing substances, and minimize professional operation personnel and mechanical facilities. .

In addition, since most of the country is composed of mountains, considering the domestic situation where the available land area is relatively small, a sewage treatment device that requires less land area is required.

The present invention is to solve the above-mentioned problems, the sewage is passed from the upper layer of the soil in which plants are planted to the lower layer, the primary treatment of the sewage in aerobic atmosphere using microorganisms parasitic in the soil, There is a technical problem to produce a sewage treatment apparatus for introducing secondary treated water into a predetermined space having an anaerobic atmosphere provided at the lower end of the soil in which the plant and the like are planted, and performing secondary treatment.

In addition, the present invention has a technical problem to provide a path through which air can flow in order to supply oxygen necessary for the growth of microorganisms inside the soil in which the plant is planted.

In addition, the present invention has a technical problem of reducing the required area of the sewage treatment apparatus by placing the aerobic tank having an aerobic atmosphere and the anaerobic tank having an anaerobic atmosphere up and down.

1 is a cross-sectional view of the sewage treatment apparatus according to the present invention,

2 is a block diagram showing the configuration of the horizontal pipe and the vertical pipe of the sewage treatment apparatus according to the present invention,

3 is a plan view of the sewage treatment apparatus according to the present invention,

4 is a plan view of the anaerobic tank of the sewage treatment apparatus according to the present invention.

<Description of the symbols for the main parts of the drawings>

2: collection tank 4: sewage inlet pipe

6: screen bath 8: dispense tank

10 screen 12 distribution tube

20: aerobic tank 22: plant

24: vertical vent pipe 26: horizontal vent pipe

28: first gravel layer 30: first sand layer

30 ': second sand layer 31: aggregate layer

32: treated water inlet pipe 34: treated water tank

36: treated water discharge pipe 38: first hole

40: second hole 42: fine screen network

44: second gravel layer 50: anaerobic tank

52: first order film 52 ': second order film

54: bulkhead 56: treated water drain pipe

58: discharge pipe 60: discharge tank

62: concrete wall

In one aspect, the present invention is a collection tank (2) in which the sewage flows in, the aerobic tank (20) for treating the sewage in an aerobic atmosphere having a volume capable of sufficiently storing the sewage flow into the collection tank (2) and the aerobic An anaerobic tank 50 having an anaerobic atmosphere is formed at the bottom of the bottom surface of the tank 20, and the aerobic tank 20 has a first water repellent membrane 52 and an upper portion thereof for preventing sewage from leaking to the bottom and the perimeter. To the lower part of the aggregate layer 31 in which gravel and sand are laminated at a predetermined height, the plant 22 planted on the aggregate layer 31, and the plant layer 22 on which the plant 22 is planted. At least one horizontal tube (26) buried in order to pass through the aggregate layer (31) to provide a movement path of the treated primary treated water and to supply oxygen to the aggregate layer (31) and the plant (22), It is connected to one side of the horizontal pipe (26) and the other side opposite the At least one or more vertical pipes 24, which are opened to the atmosphere and air is introduced from the atmosphere, are installed in the horizontal pipes 26 and anaerobic tank 50 collects the primary treated water collected into the horizontal pipes 26. It consists of a treated water inlet pipe 32 for moving to, the anaerobic tank 50 is the first treated water passing through the treated water inlet pipe 32 of the aerobic tank 20 to the anaerobic tank 50 Induced from the treated water discharge pipe 36 and the second water repellent film 52 ′ provided to prevent the first treated water discharged from the treated water discharge pipe 36 from leaking around the bottom and the periphery of the treated water discharge pipe 36. The barrier rib 54 for guiding the flow path of the primary treated water and the discharge pipe 58 moving along the barrier 54 and discharging the treated secondary treated water to the outside is characterized in that it is configured.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

1 is a cross-sectional view of the sewage treatment apparatus according to the present invention, Figure 2 is a block diagram showing the configuration of the horizontal pipe and vertical pipe of the sewage treatment apparatus according to the present invention, Figure 3 is a plan view of the sewage treatment apparatus according to the present invention, 4 will be described together as a plan view of the anaerobic tank of the sewage treatment apparatus according to the present invention.

As shown in Figures 1 to 3, the sewage treatment apparatus according to the present invention largely collects the sewage generated in the village unit, the sewage collected in the collection tank (2) flows into the primary treatment It is composed of the anaerobic tank 50 which is provided at the lower end of the aerobic tank 20 and the aerobic tank 20 to be treated in the aerobic tank 20 to the secondary treatment.

At this time, the water tank 2 is provided with a screen tank 6 and the distribution tank 8 in sequence, the screen tank 6 is provided in front of the distribution tank 8 is sewage generated in the village unit Allow direct inflow.

On the other hand, a screen 10 is installed inside the screen tank 6 so that the sewage flowing into the screen tank 6 passes through the screen 10 and exists in the sewage, such as vinyl fragments, wood chips, etc. The coarse material is removed to prevent the coarse material from entering the distribution tank 8.

The distribution tank (8) is introduced into the aerobic tank (20) through the distribution pipe 12 provided on one side of the lower end of the distribution tank 8 is discharged from the screen tank 6, the distribution pipe 12 may be installed in plural numbers according to the size, shape and position of the aerobic tank 20 to distribute the sewage introduced into the distribution tank 8 evenly to the aerobic tank 20.

Here, the distribution tank (8) can be omitted if necessary, and when the distribution tank (8) is omitted, sewage from the screen tank (6) provided in front of the distribution tank (8) directly aerobic tank ( 20).

The aerobic tank 20 according to the present invention is composed of a first order membrane 52 and a concrete wall 62 which can prevent the leakage of sewage at the bottom and the wall surface, a predetermined height from the first order membrane 52 of the floor The first sand layer 30 is formed by stacking sand at a height of 5 to 15 cm, and a cylindrical tube is preferably horizontally installed on the first sand layer 30, preferably having a diameter of 10 to 20 cm. To form a horizontal tube 26, and vertically connected cylindrical tube having a diameter smaller than or equal to the diameter of the horizontal tube 26 to one side of the horizontal plane of the horizontal tube 26 to form a vertical tube 24 do.

Here, the vertical tube 24 connected to one side of the horizontal tube 26 in the longitudinal direction is open to the atmosphere so that the other side opposite to the one side connected to the horizontal tube 26 can enter the air, the opening The screen may be provided with a fine screen net 42 provided with a minute hole to prevent the dust and impurities present in the atmosphere.

Next, the first gravel layer 28 made of gravel or the like is formed from the horizontal tube 26 to a predetermined height. At this time, depending on the diameter of the gravel and the height of the first gravel layer 28, the retention time of sewage and air passing through the first gravel layer 28 is affected, the smaller the diameter of the gravel and the first gravel layer As the height of the 28 increases, the removal efficiency of the contaminants increases, but when the diameter of the gravel is too small, air gaps between the gravel may be blocked by the contaminants, causing a pressure drop, and the height of the first gravel layer 28 increases. As it increases, the pressure and weight delivered to the bottom increases, which lowers the removal efficiency of pollutants and reduces the stability of the facility. Therefore, the size of the gravel and the height of the first gravel layer 28 should be determined in consideration of the composition of the contaminants. Preferably, the diameter of the gravel is 1 to 2 cm, and the height of the first gravel layer 28 is 40 to 60 cm. It is good.

The sand having a diameter of 0.2 to 1 cm is stacked at a predetermined height on the first gravel layer 28 of the aerobic tank 20 to form a second sand layer 30 ', and the second sand layer 30' ) Is planted in (22), the contamination contained in the sewage flowing into the second sand layer (30 ') by the microorganisms growing around the root of the plant planted in the second sand layer (30'). The material is first subjected to oxidative decomposition.

Plant 22 according to the present invention means a plant that is planted in the aggregate layer 31 composed of the second sand layer 30 'and the first gravel layer 28 of the aerobic tank while providing a habitat for the microorganism, and use As a possible plant, any plant that grows well regardless of the nature of the sewage, and whose roots grow more than about 30 cm from the surface layer and which does not grow in the vertical direction but spreads in the horizontal direction of the left and right, may be used. Royal gourd is good.

On the other hand, in the present invention, the aggregate structure formed by sequentially stacking the first sand layer 30, the first gravel layer 28, and / or the second sand layer 30 'from the bottom surface of the aerobic tank 20 described above. It is called (31).

In addition, the aggregate layer 31 may omit the first sand layer 30 as necessary, and the aggregate layer by mixing sand and gravel constituting the first sand layer 30 and the first gravel layer 28. 31 can also be comprised.

On the other hand, the outer circumferential surface of the horizontal tube 26 is provided with a plurality of first holes 38 having a diameter of less than 1 cm to provide a movement path of air and primary treatment water, and the vertical tube 24 and the horizontal tube 26 The second hole 40 is provided on one side of the outer surface of the horizontal pipe (26) with a predetermined interval and the boundary surface is connected. In addition, the outside of the first hole 38 and the second hole 40 of the horizontal pipe 26 is wrapped with a nonwoven fabric to cover the horizontal pipe 26 through the first hole 38 and the second hole 40. Prevents the covering of gravel and sand from entering.

Here, the second hole 40 is cut in the shape of "V" so as to open upward on one side of the horizontal pipe 26 adjacent to the vertical pipe 24, the second cut in the shape of the "V" The hole 40 reduces the contact area that is in contact with the horizontal pipe 26 during the movement of the primary treated water, thereby reducing the flow rate of the primary treated water flowing through the second hole 40 cut in a "V" shape. Is increased. On the other hand, when the primary treated water passes quickly through the second hole 40, the pressure around the second hole 40 cut in a "V" shape is reduced, so that air flows into the vertical pipe 24 connected to the atmosphere. Easily flowed in, the air flowing into the vertical pipe 24 is sequentially passed through the horizontal pipe 26 and the first hole 38 provided in the horizontal pipe 26 and the first gravel layer 28 and / or Oxygen is supplied to the aggregate layer 31 composed of the second sand layer 30 '.

At this time, the second hole 40 cut into the "V" shape is preferably positioned to be close to the vertical tube 24, it is recommended that the vertical tube 24 and the horizontal tube 26 is connected It is good to be located about 25 to 35cm away from the interface.

On the other hand, the aforementioned horizontal tube (26) of the aerobic tank 20 provides a passage through which the treated primary treatment water flows through the aggregate layer 31 as well as the function of supplying oxygen to the aggregate layer 31 and The primary treatment water flowing into the horizontal tube 26 is disposed in the treatment tank 34 adjacent to the aerobic tank 20 through the treatment water inlet pipe 32 connected to the horizontal tube 26. Inflow.

One side of the treatment tank 34 according to the present invention is provided with a discharge pipe 36 to move the primary treatment water collected in the treatment tank 34 to the anaerobic tank 50.

Treatment tank 34 according to the present invention can be omitted, if necessary, if the treatment tank is omitted, anaerobic tank to the treatment water inlet pipe 32 is connected to the horizontal vent pipe 26 of the aerobic tank 20 It is connected to the treated water discharge pipe 36 of 50 to transfer the primary treated water treated by the aerobic tank 20 to the anaerobic tank 50.

Anaerobic tank 50 according to the present invention is installed on the lower portion of the aerobic tank 20 with the first order membrane 52 of the aerobic tank 20, the bottom and the wall surface of the anaerobic tank 50 In order to prevent the leakage of the treated water, a second order film 52 'and a concrete wall 62 are provided.

In addition, a plurality of partitions 54 are installed in the interior space of the anaerobic tank 50 to provide a movement path of the first treatment water, and the treatment water discharge pipe into which the primary treatment water discharged from the aerobic tank 20 flows. (36) and the secondary material treated in the anaerobic tank (50) is provided with a second gravel layer (44) made of gravel in a portion discharged to the outside of the anaerobic tank (50) suspended solids that can remain in the treated water At the same time, the residence time of the primary treated water is increased.

On the other hand, the discharge tank 60 is provided to be adjacent to the anaerobic tank 50 to one side of the bottom surface of the concrete wall 62 of the anaerobic tank 50, the inside of the discharge tank 60 to the anaerobic tank ( A treatment water drain pipe 56 connected to the anaerobic tank 50 is provided to allow the second treated water discharged from the tank 50 to flow into the other side facing the treated water drain pipe 56 of the discharge tank 60. The discharge pipe 58 is installed to discharge the secondary treatment water introduced into the discharge tank 60 to the outside.

In this case, the discharge tank 60 may be omitted as necessary. When the discharge tank 60 is omitted, the secondary treatment water discharged from the anaerobic tank 50 may be connected to the discharge pipe 58. Discharge to the outside. However, considering the improvement and maintenance of the sewage treatment apparatus according to the present invention, it is good to install the discharge tank (60).

On the other hand, the concrete wall 62 forming the walls of the aerobic tank 20 and the anaerobic tank 50 is to prevent the leakage of sewage, primary treatment water and secondary treatment water, the installation form of the sewage treatment apparatus For example, the first order layer 52 may be replaced depending on the case where the composition of the aerobic tank 20 and the anaerobic tank 50 can be easily formed.

Apparatus that can be added or subtracted from the sewage treatment apparatus according to the present invention, for example, the distribution tank (8), the treatment water tank 34 and the discharge tank (60) may be added or omitted depending on the initial investment, use and usage. However, in consideration of efficient operation and management of the sewage treatment device, it is preferable to add and use the distribution tank 8, the treatment water tank 34, and the discharge tank 60 constituting the sewage treatment device.

Referring to the operation of the sewage treatment device having the above-described configuration as follows.

First, when sewage is generated from each source of sewage and waste water such as villages, the generated sewage is moved to the screen tank 6 through the sewage inflow pipe 4. Meanwhile, the sewage moved to the screen tank 6 passes through the screen 10 installed inside the screen tank 6 to remove coarse substances such as vinyl fragments and wood fragments contained in the sewage. Inflow into the distribution tank (8) connected to the rear side of the screen tank (6), the sewage introduced into the distribution tank (8) through the distribution pipe 12 installed on one side of the distribution tank (8) It is conveyed to the top of 20.

Then, the sewage transferred to the upper portion of the aerobic tank 20 sequentially the second sand layer 30 ′, the first gravel layer 28 and the first sand layer 30 located above the aerobic tank 20. Passage removes the suspended substances contained in the sewage, and the organic pollutants contained in the sewage is the microorganisms present in the second sand layer 30 'and the first gravel layer 28 and the second sand layer 30' And the first gravel layer 28 are oxidatively decomposed by microorganisms attached to the roots of the plant 22 planted.

On the other hand, ammonia nitrogen in the sewage is oxidized to nitrate nitrogen by nitrifying bacteria or the like inhabiting the roots of the second sand layer 30 'and the first gravel layer 28 and the plant 22, and in the case of phosphorus, Ingested as microorganisms or plants 22, but most of the Ca ²⁺ , Mg ²⁺ , Al ³⁺ and Fe ³ present in the second sand layer 30 ', the first sand layer 30 and the first gravel layer 28 ^{It is} removed by combining with a cation such as ⁺ to form an insoluble compound.

Here, a part of the nitrate nitrogen generated by oxidizing ammonia nitrogen by the nitrifying bacteria is introduced into the anaerobic tank 50 and converted to nitrogen and removed.

In addition, when the sewage is passed through the second sand layer 30 'and the filtered organic suspended solids are decomposed by soil microorganisms inhabiting the second sand layer 30', the organic suspended solids are decomposed by the second sand layer 30. Suppresses the phenomenon of blocking voids.

In general, when the average concentration of suspended solids in the aerobic tank is 154.8 mg / L, and the total amount of sewage is 15m ³ / day, the total weight of the suspended solids is 2472 g. Considering that the specific gravity of the organic suspended solids is considered to be 0.5 to 1, when the specific gravity of the suspended solids is 0.5, the volume of the total suspended solids is 4.944 × 10 ⁻³ m ³ / day.

On the other hand, when the sewage containing the suspended substance is uniformly introduced into the surface of the layer of the aerobic tank 20, the air gap of the aggregate layer 31 composed of the second sand layer 30 'and the first gravel layer 28 by sludge The effective depth H that can be blocked is about 0.1 mm / day. Here, the effective depth was calculated by the following Equation 1, the total aerobic composition is 10m × 15m, the porosity was calculated as 0.3, the minimum value of the porosity.

Therefore, when the sewage containing suspended solids having a concentration of 164.8 mg / L in an aerobic tank having a size of 10 m × 15 m is introduced in an amount of 15 m ³ / day, the pores of the aggregate layer are blocked to a depth of 0.1 mm per day, and the closed The voids interfere with the flow of sewage flowing into the aerobic tank 20, and thus, the sewage flowing into the aerobic tank 20 may not flow into the anaerobic tank 50 and may overflow.

However, in the present invention, since the organic suspended solids contained in the sewage are ingested / decomposed by the microorganisms by the microorganisms growing in the roots of the plant 22, sewage is sequentially introduced to the surface of the aerobic tank 20. The sewage flows into the soil with good permeability adjacent to the pores blocked by the introduced sewage, and the sewage is uniformly distributed on all surfaces of the aerobic tank. Decomposition proceeds to secure voids.

In addition, an earthworm may be added to the second sand layer 30 ′ of the aerobic tank 20 according to the present invention to improve the removal efficiency of the aerobic tank 20. When introduced into the second sand layer 30 ', the sludge and suspended solids filtered in the second sand layer 30' can be decomposed and ingested to promote the removal of the sludge and the suspended solids, and an earthworm can remove the organic suspended solids. Since the voids of the second sand layer 30 'are continuously secured while moving, the water permeability of the sewage and air permeability are maintained.

When the suspended solids present in the sewage are removed by microorganisms and earthworms by the aforementioned microorganisms, sludge which is common in wastewater treatment by the activated sludge method, activated sludge method, etc. does not occur, and thus sludge is precipitated. This eliminates the need for a separate settling tank to be removed.

On the other hand, in the case of the aerobic tank 20 according to the present invention to continuously maintain the aerobic atmosphere by supplying oxygen to the microorganism in order to maintain the growth of the microorganism, predetermined in the horizontal tube 26 to satisfy this condition Since a plurality of vertical pipes 24 are installed at intervals, air is introduced into one side of the vertical pipes 24 open to the atmosphere, moved to the horizontal pipes 26, and the air moved to the horizontal pipes 26 is Oxygen is supplied to the aggregate layer 31 including the first gravel layer 28 and / or the second sand layer 30 'through the first hole provided in the horizontal pipe 26.

As described above, the treated primary water passes through the aggregate layer 31 composed of the second sand layer 30 ′ and / or the first gravel layer 28 of the aerobic tank 20. Primary treatment water is introduced into the horizontal tube (26) through the plurality of first holes formed in the horizontal tube (26) evenly installed at the lower portion of the horizontal tube (26), and introduced into the horizontal tube (26). Is introduced into the treatment water inlet pipe 32 connected to one side of the treatment tank 34 along the horizontal pipe 26 to be collected into the treatment tank 32, and the primary collected by the treatment tank 32. The treated water is moved to the anaerobic tank 50 through the treated water discharge pipe 36 connected to the lower end side of the treated water tank 32.

The primary treated water moved to the anaerobic tank 50 passes through the second gravel layer 44 covering the treated water discharge pipe 36 and flows into the anaerobic tank 50. At this time, the second gravel layer 44 is to ensure the residence time of the primary treated water.

On the other hand, the primary treated water that is moved to the anaerobic tank 50 includes a portion of nitrate nitrogen oxidized by the nitrifying bacteria inhabiting the aggregate layer 31 and the root of the plant 22 of the aerobic tank 20. The anaerobic tank 50 is denitrated to remove the nitrate nitrogen contained in the primary treated water.

In general, anaerobic treatment compared with aerobic treatment requires a long residence time for the treated water to pass through the anaerobic tank 50 over a long time, the primary treated water introduced into the anaerobic tank 50 is shown in Figures 1 and 4 As shown in FIG. 1, the primary treatment water flows in a zigzag direction along the plurality of partition walls 54 provided in the anaerobic tank 50.

The secondary treated water that is moved and treated along the partition wall 54 passes through the treated water drain pipe 56 connected to one side of the anaerobic tank 50 and is moved to the discharge tank 60, and the discharge tank 60 is provided. It is discharged to the outside through the discharge pipe 58 provided on one side of).

Hereinafter, the present invention will be described in detail through examples. However, the following examples are only for illustrating the present invention in detail and are not intended to limit the scope of the present invention by these examples.

<Example 1>

As shown in Fig. 1, the aerobic tank of 10m in length, 15m in length and 1m in depth is installed and the lower part is 9.5m in width, the lower part is 8.5m in length, and the vertical length is 10m in depth. Installed a sewage treatment system consisting of 1.2 m anaerobic tank.

Here, after stacking a 10cm thick sand layer on the bottom surface of the aerobic tank, a horizontal pipe and a vertical pipe having a diameter of 15cm are installed on the sand layer, covering the nonwoven fabric on the horizontal pipe, and filling the gravel with a height of 50cm to form a corrugated layer. I was. Then, a sand layer was formed at a height of 20 cm in the gravel-filled gravel layer, and a reed was planted with the plant 22, and then a sand layer of 10 cm was formed thereon. On the other hand, to the left and right of the anaerobic tank, gravel was laminated at a height of 1 m.

Then, 15m ³ / day of sewage was injected into the aerobic tank, the characteristics of the initial sewage are shown in Table 1, and the atmospheric temperature was -1.2 ° C corresponding to winter time.

Then, the concentration of the initial sewage and the treatment of the treated primary water and the anaerobic tank through which the primary treated water flowed through the anaerobic tank was investigated.

The results are shown in Table 1.

Initial sewage (mg / L) Primary treated water (mg / L) Secondary treated water (mg / L) Total removal rate (%) pH 7.3 5.36 6.5 - DO 0.32 5.83 0.80 - BOD 152.4 12.2 6.6 95.7 COD 164.8 17.2 12.8 92.2 SS 124.6 0.9 0.9 99.3 Total nitrogen 74.2 43.8 7.9 89.3 A total person 5.2 0.27 0.16 96.9 Water temperature 10.5 ℃ 8.3 ℃ 8.5 ℃ -

As can be seen from Table 1, the sewage treatment apparatus according to the present invention had a BOD removal rate of 95.7%, a COD removal rate of 92.2%, a solid suspension (SS) removal rate of 99.3%, a total nitrogen concentration of 89.3%, and a total phosphorus concentration of The removal rate was 96.6%, and the water quality of the secondary treated water discharged through anaerobic tank was BOD 6.6mg / L, COD 12.8mg / L, suspended solids (SS) 0.9mg / L, TN 7.9mg / L , TP 0.16mg / L, much lower than BOD 20mg / L, COD 40mg / L, suspended solids (SS) 20mg / L, TN 60mg / L, TP 8mg / L Giving.

In particular, in the case of total nitrogen, the total nitrogen concentration of the initial sewage was 74.2 mg / L, of which the ammonia nitrogen concentration was 73.1 mg / L and the nitrate nitrogen concentration was 0.2 mg / L. The concentration of ammonia nitrogen decreased to 4.8 mg / L and the concentration of nitrate nitrogen increased to 65.4 mg / L. It is believed that the ammonia nitrogen was oxidized to nitrate nitrogen by microorganisms that pass through the aerobic tank and inhabit the roots, sand layers and gravel layers of reeds. Therefore, the concentration of total nitrogen present in the primary treated water is reduced to 48.3 mg / L and most of the nitrogen remains in the sand and gravel layers as mainly nitrate nitrogen.

On the other hand, since the concentration of dissolved oxygen (DO) in the influent is 0.32 mg / L, the dissolved oxygen of the primary treated water is 5.83 mg / L, and sufficient oxygen necessary for the oxidation of ammonia nitrogen is supplied to the aerobic tank. It seems to mean that it is.

In addition, the total amount of sewage introduced during the day was 15m ^3, but the total amount of discharged water discharged was 11.8m ³ . It is thought that about 21.3% (3.2m ³ ) of sewage evaporated by reed transpiration or on aerobic surface.

<Example 2>

It carried out in the same manner as in Example 1, the total amount of sewage flowing into the aerobic tank was 13.9m ³ , the atmospheric temperature was 15.5 ℃ corresponding to the spring weather.

The results are shown in Table 2.

Initial sewage (mg / L) Primary treated water (mg / L) Secondary treated water (mg / L) Total removal rate (%) pH 6.9 6.1 6.7 - DO 0.95 4.1 1.28 - BOD 144.6 7.6 5.9 95.9 COD 98.5 10.2 7.9 92.0 SS 129.6 1.1 1.0 99.2 Total nitrogen 54.7 30.5 7.7 85.9 A total person 5.62 0.45 0.28 95.9 Treated water temperature 13.5 ℃ 11.9 ℃ 12.1 ℃ -

<Example 3>

It carried out in the same manner as in Example 1, the total amount of sewage flowing into the aerobic tank was 17.8m ³ , the atmospheric temperature was 19.6 ℃ corresponding to spring weather.

The results are shown in Table 3.

Initial sewage (mg / L) Primary treated water (mg / L) Secondary treated water (mg / L) Total removal rate (%) pH 7.1 6.5 6.9 - DO 0.13 5.48 0.90 - BOD 99.6 6.1 5.0 95.0 COD 98.5 10.2 7.9 90.2 SS 84.6 0.32 0.30 99.6 Total nitrogen 26.9 11.6 3.8 85.9 A total person 5.24 0.28 0.15 97.1 Treated water temperature 23.2 ℃ 22.1 ℃ 22.3 ℃ -

<Example 4>

It carried out in the same manner as in Example 1, the total amount of sewage flowing into the aerobic tank was 23.5m ³ , the atmospheric temperature was 28 ℃ corresponding to the summer weather.

The results are shown in Table 4.

Initial sewage (mg / L) Primary treated water (mg / L) Secondary treated water (mg / L) Total removal rate (%) pH 6.9 6.0 6.6 - DO 0.04 3.82 1.21 - BOD 141.8 8.5 6.8 95.2 COD 102.5 10.2 8.1 92.1 SS 118.9 0.9 0.9 99.2 Total nitrogen 58.9 30.2 8.18 86.2 A total person 8.65 0.6 0.24 97.2 Treated water temperature 24 ℃ 24.3 ℃ 22.8 ℃ -

Example 5

It carried out in the same manner as in Example 1, the total amount of sewage flowing into the aerobic tank was 16.1m ³ , the atmospheric temperature was -5.1 ℃ corresponding to cold winter weather.

The results are shown in Table 5.

Initial sewage (mg / L) Primary treated water (mg / L) Secondary treated water (mg / L) Total removal rate (%) pH 7.2 6.3 6.9 - DO 0.75 4.16 1.35 - BOD 99.4 6.5 4.9 95.1 COD 105.2 9.9 7.8 92.6 SS 125.5 1.1 1.0 99.2 Total nitrogen concentration 46.6 25.7 7.0 85.0 Total phosphorus concentration 11.3 0.42 0.26 97.7 Treated water temperature 13.2 ℃ 7.5 ℃ 7.2 ℃ -

<Example 6>

It carried out in the same manner as in Example 1, the total amount of sewage flowing into the aerobic tank was 16.2m ³ , the atmospheric temperature was -1.0 ℃ corresponding to winter weather.

The results are shown in Table 6.

Initial sewage (mg / L) Primary treated water (mg / L) Secondary treated water (mg / L) Total removal rate (%) pH 7.2 5.5 6.5 - DO 0.29 5.50 0.91 - BOD 139.5 10.2 5.6 95.6 COD 142.6 15.4 10.9 92.3 SS 101.6 0.9 0.9 99.1 Total nitrogen 68.5 36.5 6.3 90.8 A total person 5.1 0.28 0.17 96.7 Treated water temperature 10.4 ℃ 8.4 ℃ 7.6 ℃ -

<Example 7>

It carried out in the same manner as in Example 6, the total amount of sewage flowing into the aerobic tank was 35.3m ³ , 2.1 times that of Example 6, the atmospheric temperature was -1.3 ℃ similar to Example 6.

The results are shown in Table 7.

Initial sewage (mg / L) Primary treated water (mg / L) Secondary treated water (mg / L) Total removal rate (%) pH 7.1 5.4 6.7 - DO 0.21 4.96 0.79 - BOD 146.2 10.9 7.2 95.1 COD 138.3 12.5 10.6 92.3 SS 98.1 1.0 1.0 99.0 Total nitrogen 65.6 39.2 7.8 88.1 A total person 6.8 0.25 0.21 96.9 Treated water temperature 9.6 ℃ 8.4 ℃ 8.1 ℃ -

<Example 8>

In the same manner as in Example 6, the total amount of sewage flowing into the aerobic tank was 50.3m ³ , which is about three times that of Example 6, and the atmospheric temperature was -1.8 ° C. similar to that of Example 6.

The results are shown in Table 8.

Initial sewage (mg / L) Primary treated water (mg / L) Secondary treated water (mg / L) Total removal rate (%) pH 7.2 5.6 6.9 - DO 0.3 5.6 1.2 - BOD 129.3 15.2 10.9 91.6 COD 132.2 13.1 10.7 91.9 SS 99.5 1.0 1.0 99.0 Total nitrogen concentration 70.2 40.7 12.6 82.1 Total phosphorus concentration 6.6 0.72 0.62 90.6 Treated water temperature 10.3 ℃ 8.4 ℃ 8.3 ℃ -

Example 9

In the same manner as in Example 1, the height of the gravel layer located in the aerobic tank and anaerobic tank of Example 1 was reduced to 37.5 cm in the aerobic tank, 75 cm in the anaerobic tank. On the other hand, the total amount of sewage flowing into the aerobic tank was 15.9 m ³ , and the atmospheric temperature was 15 ° C. corresponding to spring weather.

The results are shown in Table 9.

Initial sewage (mg / L) Primary treated water (mg / L) Secondary treated water (mg / L) Total removal rate (%) pH 7.24 6.50 6.71 - DO 0.21 4.31 0.91 - BOD 152.6 11.9 7.6 95.0 COD 96.4 12.5 9.2 90.4 SS 121.3 1.2 1.1 99.1 Total nitrogen 54.6 21.6 7.1 87.0 A total person 9.3 0.70 0.31 96.7 Treated water temperature 21 ℃ 17.4 ℃ 15.5 ℃ -

<Example 10>

In the same manner as in Example 9, the height of the first gravel layer and the second gravel layer located in the aerobic tank and anaerobic tank of Example 9 was reduced to 16.7 cm for aerobic tank, to 33.3 cm for anaerobic tank. On the other hand, the total amount of sewage flowing into the aerobic tank was 16.1 m ³ , and the atmospheric temperature was 14 ° C. corresponding to spring weather.

The results are shown in Table 10.

Initial sewage (mg / L) Primary treated water (mg / L) Secondary treated water (mg / L) Total removal rate (%) pH 6.95 6.11 6.16 - DO 0.19 4.38 0.92 - BOD 145.5 21.6 15.4 89.4 COD 96.4 12.5 9.2 84.9 SS 109.6 1.3 1.2 98.9 Total nitrogen 62.1 29.9 14.2 77.1 A total person 9.2 2.3 1.7 81.5 Treated water temperature 20.5 ℃ 17.2 ℃ 15.1 ℃ -

<Example 11>

In the same manner as in Example 2, but 10 earthworms per unit area was added to the sand layer located on the top of the aerobic tank. On the other hand, the total amount of sewage flowing into the aerobic tank was 15.5 m ³ . Atmospheric temperatures were 16 ° C., corresponding to spring weather.

The results are shown in Table 11.

Initial sewage (mg / L) Primary treated water (mg / L) Secondary treated water (mg / L) Total removal rate (%) pH 7.0 6.0 6.7 - DO 0.89 5.98 1.30 - BOD 168.4 7.1 3.2 98.1 COD 102.7 10.1 5.4 94.7 SS 136.2 1.0 0.9 99.3 Total nitrogen 57.2 28.3 5.1 91.1 A total person 6.26 0.38 0.19 97.0 Treated water temperature 14.1 ℃ 12.4 ℃ 12.6 ℃ -

Compared with Example 2, which was conducted under similar conditions as in Example 11, it was found that the removal efficiency was further improved when the earthworm was put in the sand layer of the aerobic tank.

In particular, it can be seen that the dissolved oxygen amount (DO) of the primary treated water of the present Example 11 in which the earthworm was introduced is higher than the dissolved oxygen amount of the primary treated water of Example 2 (4.1 mg / L). It is considered that this is because when the earthworm is put on the surface of the aerobic tank, the pores of the sand layer and the gravel layer are secured due to the earthworm moving to ingest organic pollutants.

<Example 12>

It carried out in the same manner as in Example 11, the total amount of sewage flowing into the aerobic tank was 18.4m ³ , the atmospheric temperature was -4.6 ℃ corresponding to the winter weather.

The results are shown in Table 12.

Initial sewage (mg / L) Primary treated water (mg / L) Secondary treated water (mg / L) Total removal rate (%) pH 7.1 6.2 6.8 - DO 0.68 5.99 1.42 - BOD 112.4 4.8 3.2 97.2 COD 125.5 9.5 5.7 95.5 SS 131.6 0.8 0.7 99.5 Total nitrogen concentration 53.6 26.2 5.0 90.7 Total phosphorus concentration 12.6 0.30 0.16 98.7 Treated water temperature 13.6 ℃ 8.2 ℃ 8.0 ℃ -

As can be seen from Examples 1 to 12, the amount of suspended solids (SS) contained in the primary treated water and the secondary treated water compared to the amount of suspended solids (ss) contained in the initial sewage of all the examples. You can see this very small. This may be because various suspended solids contained in the initial sewage are filtered through the porous layer of the aerobic aggregate layer.

Comparative Example 1

In order to construct a wastewater treatment apparatus having the same structure as that described in Korean Utility Model Publication No. 1998-0002862, sewage flows into the ground at the bottom of the same area as the aerobic tank having a length of 10 m, a length of 15 m, and a depth of 1 m in Example 1 After the installation of a repellent film for preventing the formation of the aggregate layer in the same manner as in Example 1 on the upper portion of the aggregate layer was provided with a reed tank. In addition, a plurality of horizontal pipes were installed in the lower portion of the aggregate layer of the reed tank and vertical pipes were installed vertically to the horizontal pipes to supply air to the aggregates layer from the atmosphere.

Then, on one side of the reed tank was installed a pipe for collecting the treated water in the reed tank to move to the water weeding tank. At this time, the myelin sheath tank is installed in the same size as the anaerobic tank of Example 1 having a horizontal length of 9.5m, a vertical length of 10m and a depth of 1.2m, the water curtain is installed at the lower end, and filled with aggregate on the top Bud, stringer, sol iris, sassopcho, rush, iris, etc.) were planted.

Then, 15.6 m ³ / day of sewage was injected into the wastewater treatment device into the reed tank, and the atmospheric temperature was -1.2 ° C. corresponding to winter time.

Then, the concentration of the treated reed tank and the treated reed tank was passed through the reed tank treated with the concentration of the initial sewage and the reed tank was examined.

Initial sewage (mg / L) Reed bath treatment water (mg / L) Water treatment tank (mg / L) Total removal rate (%) pH 7.5 5.62 6.3 - DO 0.37 4.12 2.34 - BOD 143.8 21.4 10.2 92.9 COD 159.2 29.5 20.1 87.4 SS 116.4 1.1 1.0 98.9 Total nitrogen concentration 64.3 38.6 18.6 71.1 Total phosphorus concentration 3.9 0.31 0.17 95.6 Treated water temperature 10.2 ℃ 8.2 ℃ 4.5 ℃ -

As shown in Table 13, the BOD removal rate of Comparative Example 1 was 92.9%, the COD removal rate was 84.7%, the solid suspension (ss) removal rate was 98.9%, the total nitrogen concentration was removed at 71.1%, and the total phosphorus concentration. Removal rate was 95.6%.

This is inferior in treatment efficiency when compared with Table 1 of Example 1 of the present invention performed under similar conditions.

In addition, the concentration value of DO representing the dissolved oxygen content of the reed tank in Table 13 is 4.12mg / L, the DO concentration value in Table 1 of Example 1 is 5.83mg / L from the point of the sewage treatment apparatus according to the present invention The flow of air to the aggregate layer is considered to be smoother.

On the other hand, considering that the DO value of the water tank in the table 13 is 2.34mg / L, it is determined that the water tank does not maintain an anaerobic state, which is not effective biological denitrification process in the water tank It is not believed.

Comparative Example 2

It carried out in the same manner as in Comparative Example 1, the total amount of sewage flowing into the reed tank was 13.5m ³ / day, the atmospheric temperature was 15.5 ℃ corresponding to the spring weather. Here, the conditions are similar to Example 2.

The results are shown in Table 14.

Initial sewage (mg / L) Reed Chorizo (mg / L) Water treatment tank (mg / L) Total removal rate (%) pH 7.0 6.4 6.5 - DO 0.96 3.80 2.42 - BOD 145.8 18.3 9.6 93.4 COD 97.7 18.4 12.6 87.1 SS 126.5 1.2 1.1 99.1 Total nitrogen concentration 52.8 30.3 15.4 70.8 Total phosphorus concentration 5.56 0.52 0.30 94.6 Treated water temperature 13.6 ℃ 12.0 ℃ 12.0 ℃ -

Comparative Example 3

It carried out in the same manner as in Comparative Example 1, the total amount of sewage flowing into the reed tank was 17.6 m ³ / day, the atmospheric temperature was 19.4 ℃ corresponding to the spring time. Here, the conditions are similar to Example 3.

The results are shown in Table 15.

Initial sewage (mg / L) Reed Chorizo Water treatment tank (mg / L) Total removal rate (%) pH 7.0 6.8 6.9 - DO 0.14 4.68 2.52 - BOD 100 10.9 8.4 91.6 COD 98.4 15.8 10.2 89.6 SS 85.4 0.46 0.32 99.6 Total nitrogen concentration 25.9 18.5 10.2 60.6 Total phosphorus concentration 5.22 0.31 0.2 96.2 Treated water temperature 23.6 ℃ 21.4 ℃ 19.8 ℃ -

Comparative Example 4

It carried out in the same manner as in Comparative Example 1, the total amount of sewage flowing into the reed tank was 22.8m ³ / day, the atmospheric temperature was 27 ℃ corresponding to the summer season. Here, the conditions are similar to Example 4.

The results are shown in Table 16.

Initial sewage (mg / L) Reed Chorizo Water treatment tank (mg / L) Total removal rate (%) pH 7.0 6.5 6.6 - DO 0.05 1.98 1.72 - BOD 140.6 24.6 13.2 90.6 COD 100.9 25.4 19.6 80.6 SS 124.2 1.2 1.0 99.2 Total nitrogen concentration 45.8 26.2 15.7 65.7 Total phosphorus concentration 10.9 0.63 0.41 96.2 Treated water temperature 23.6 ℃ 21.4 ℃ 19.8 ℃ -

As described above, those skilled in the art will understand that the present invention can be implemented in other specific forms without changing the technical spirit or essential features. Therefore, the exemplary embodiments described above are to be understood as illustrative in all respects and not as restrictive. The scope of the present invention should be construed that all changes or modifications derived from the meaning and scope of the following claims and equivalent concepts thereof are included in the scope of the present invention rather than the above detailed description.

The sewage treatment apparatus according to the present invention secures a passage through which air can flow in an aggregate layer of an aerobic tank in an oxygen atmosphere, and then grows a microorganism capable of removing contaminants in the aggregate layer by planting the plant in the aggregate layer. After forming the anaerobic tank lacking oxygen at the lower end of the aerobic tank, the sewage, etc. are firstly treated by passing the aerobic tank, and the first treated water is passed through the anaerobic tank for the second treatment, thereby providing a pump required for a general sewage treatment apparatus. It does not require devices such as stirrers, blowers, etc., and it does not require specialized operating personnel to manage the devices, so it requires less initial investment and maintenance costs. It works.

On the other hand, the sewage treatment apparatus according to the present invention has an effect that can reduce the use of the site for installing the treatment apparatus because it is configured in the form of an anaerobic tank in an oxygen-free atmosphere to the lower end of the aerobic tank requiring oxygen.

In addition, when the earthworm is put on the upper end of the aerobic tank, the sludge and suspended solids generated during the treatment of sewage are removed by the earthworm and the microorganism, so that the treatment cost of the sludge does not occur.

Claims (6)

In the sewage treatment apparatus for treating sewage, Sewer tank 2 into which sewage flows, aerobic tank 20 and a bottom surface of the aerobic tank 20 having a volume capable of sufficiently storing the sewage flowing into the sump tank 2 and treating the sewage in an aerobic atmosphere An anaerobic tank 50 having an anaerobic atmosphere is formed at a lower end thereof, and the aerobic tank 20 has a first water repellent film 52 for preventing sewage leakage from the bottom and the periphery, and gravel and sand at a predetermined height thereon. Aggregate layer 31 is laminated to the aggregate layer 31, the plant 22 planted on top of the aggregate layer 31, the aggregate layer 31 to the lower portion of the aggregate layer 31, the plant 22 is planted. At least one horizontal tube 26 and the horizontal tube 26 which are buried in order to provide a movement path of the treated primary treated water and to supply oxygen to the aggregate layer 31 and the plant 22. It is connected to one side and the other side opposite is opened to the atmosphere At least one vertical tube 24 into which the air flows in is connected to the horizontal tube 26, and the primary treatment water collected in the horizontal tube 26 is transferred to the anaerobic tank 50 to flow into the anaerobic tank 50. Constitution of the pipe 32, the anaerobic tank 50 is the treated water discharge pipe for guiding the first treatment water passing through the treated water inlet pipe 32 of the aerobic tank 20 to the anaerobic tank (50) ) And a second water repelling membrane 52 'provided at the bottom and the circumference of the treated water discharge pipe 36 so as not to leak, and a flow path of the first treated water introduced from the treated water discharge pipe 36. The sewage treatment device, characterized in that consisting of a discharge pipe (58) for guiding the discharge, moving along the partition (54) and discharge the treated secondary treatment water to the outside. The method of claim 1, A treatment tank capable of collecting the primary treated water treated in the aerobic tank 20 between the treated water inlet pipe 32 of the aerobic tank 20 and the treated water discharge pipe 36 of the anaerobic tank 50 ( Sewage treatment apparatus characterized in that the 34 is further provided. The method of claim 1, Sewage treatment apparatus further comprises a discharge tank (60) for collecting the secondary treated water treated in the anaerobic tank (50) between the anaerobic tank (50) and the discharge pipe (58). The method of claim 1, Sewage treatment, characterized in that the treated water discharge pipe 36 of the anaerobic tank 50 and the second gravel layer 44 is laminated with gravel where the second treated water treated in the anaerobic tank 50 is discharged. Device. The method of claim 1, Sewage treatment apparatus characterized in that the earthworm is put into the upper portion of the aggregate layer 31 of the aerobic tank (20). The method according to any one of claims 1 to 5, The second hole 40 cut in a "V" shape so as to open upwardly on one side of the outer surface of the horizontal tube 26 with a boundary between the vertical tube 24 and the horizontal tube 26 connected to each other. Sewage treatment apparatus characterized in that the provided.