KR101667932B1 - Apparatus and method for anaerobic wastewater treatment with membrane distillation - Google Patents

Abstract

The present invention relates to a membrane distillation type anaerobic wastewater treatment method capable of effectively improving the quality of treated water by combining membrane distillation with biological treatment, anaerobic treatment of wastewater and biogas production, An anaerobic bioreactor for anaerobic treatment of the wastewater and generating methane gas, and an anaerobic bioreactor for the outflow wastewater of the anaerobic bioreactor, characterized in that the anaerobic wastewater treatment apparatus comprises: An anaerobic membrane distillation separation tank for filtering wastewater by a separation membrane module and providing an additional anaerobic treatment space for wastewater; an immersion membrane module provided in the anaerobic membrane distillation separation tank for filtering wastewater; And the turbulence of the wastewater and the flow of the fluid medium are induced by the rotation And a flow path through which the cooling water moves is provided within the submerged membrane module, and the moisture of the wastewater is evaporated by the temperature difference between the wastewater and the cooling water, and the wastewater is filtered through the channel. .

Description

[0001] Apparatus and method for anaerobic wastewater treatment with membrane distillation [

The present invention relates to an apparatus and a method for treating membrane distillation-type anaerobic wastewater, and more particularly, to an apparatus and method for treating anaerobic wastewater by combining membrane distillation and biological treatment to improve treated water quality, anaerobic treatment of wastewater, The present invention relates to a membrane distillation-coupled anaerobic wastewater treatment apparatus and method capable of effectively inhibiting contamination of the surface of a separation membrane.

Recently, membrane bio-reactors (MBR) have been widely applied to the treatment of sewage and wastewater. Membrane bioreactor is a process to treat wastewater with high efficiency by combining biological treatment process typified by activated sludge and membrane, and it is possible to keep the concentration of microorganisms in the reaction tank high regardless of the settling property of sludge, There is an advantage that excellent treated water quality can be obtained. Particularly, a submerged membrane bioreactor in which a membrane is directly immersed in an aeration tank to suck out treated water is advantageously used due to its compactness and energy efficiency. Korean Patent Registration No. 315968, Korean Patent Publication No. 2000-0065883, 2000-0003714, 2002-0089255, 2003-0039038, and the like.

When such an immersion membrane bioreactor is applied, clogging of the membrane due to contamination of the membrane surface occurs inevitably. In order to prevent this, clogging of the membrane can be prevented by forming a turbulence by aeration. However, in this case, a much larger amount of aeration is required than the amount of air required for biological treatment, which results in a disadvantage of excessive energy consumption and maintenance cost.

To overcome these drawbacks, KH Ahn, KG Song, IT Yeom, KY Park, (2001). &Quot; Water Science and Technology, 1 (5-6), 315-323 ", and Korean Patent Publication 2007-0075947, " Performance Comparison of Direct Membrane Separation and Membrane Bioreactor for Domestic Wastewater Treatment and Water Reuse, We tried to suppress clogging of membrane by using membrane module. However, even in this method, in order to suppress clogging of the membrane, it is necessary to speed up the rotating disk or the propeller in order to form an effective turbulent flow, and therefore there is still a disadvantage in that energy consumption for rotation of the rotating disk or the propeller is still required .

On the other hand, biological treatment of wastewater is generally used for aerobic treatment to supply oxygen, but aerobic treatment is disadvantageous in that a considerable amount of energy is required to supply oxygen. On the other hand, the anaerobic treatment has an advantage of not only supplying oxygen but also producing biogas to produce available renewable energy. However, for the anaerobic treatment, it is important to keep the anaerobic microorganisms having a relatively low growth rate at a high concentration in the reactor, which can be solved by supplying a filter medium capable of adhering and growing anaerobic microorganisms and using a membrane bioreactor at the same time. In addition, the conventional membrane bioreactor generally uses a technology in which a microfilter (MF) is combined with a bioreactor. The microfiltration membrane has disadvantages that most of the dissolved or ionized materials can not be treated, There is a need for further technical problems.

Korean Patent No. 315968 Korean Patent Publication No. 2000-0065883 Korean Patent Publication No. 2000-0003714 Korean Patent Publication No. 2002-0089255 Korean Patent Publication No. 2003-0039038 Korean Patent Publication No. 2007-0075947

<K. H. Ahn, K. G. Song, I. T. Yeom, K. Y. Park, (2001). "Performance comparison of direct membrane separation and membrane bioreactor for domestic wastewater treatment and water reuse," Water Science and Technology, 1 (5-6), 315-323,

Disclosure of the Invention The present invention has been made in order to solve the above problems, and it is an object of the present invention to improve the quality of treated water by combining membrane distillation and biological treatment, to produce biogas by anaerobic treatment of wastewater, The present invention is directed to a membrane distillation-coupled anaerobic wastewater treatment apparatus and method capable of effectively inhibiting anaerobic wastewater treatment.

In order to accomplish the above object, there is provided an apparatus for treating membrane distillation-type anaerobic wastewater according to the present invention, comprising: an anaerobic bioreactor for anaerobic treatment of wastewater and methane gas; and an outflow wastewater of the anaerobic bioreactor, An anaerobic membrane distillation separation tank for filtering wastewater by a separation membrane module and providing an additional anaerobic treatment space for wastewater; an immersion membrane module provided in the anaerobic membrane distillation separation tank for filtering wastewater; And a rotary disc for inducing turbulent flow of the wastewater and a flow of the fluid material through the rotation, and a flow path through which the cooling water is moved is provided in the submerged membrane module, and the moisture of the wastewater due to the temperature difference between the wastewater and the cooling water And the wastewater is filtered through the passage. All.

The anaerobic bioreactor is provided with a plurality of first fluid filtration media, a plurality of second fluid filtration media are provided in the anaerobic membrane distillation separation tank, and anaerobic microorganisms are attached to the surfaces of the first and second fluid filter media .

The submerged separation membrane module is provided with a flow path forming plate having a flow path through which cooling water is moved and a unit separating membrane disposed on the front and back surfaces of the flow path plate for separating the flow path from the external environment, . In addition, the unit separation membrane is composed of a porous hydrophobic separation membrane, the moisture of the wastewater does not directly pass through the unit separation membrane, and only water vapor passes through the pores of the unit separation membrane.

Wherein the flow path forming plate includes a reference plate, a rectangular frame, and a central frame, and a rectangular frame is provided on the periphery of the reference plate orthogonal to the reference plate, And the space inside the reference plate forms a U-shaped flow path by the square frame and the center frame.

A square frame and a center frame are formed on the front and back surfaces of the reference plate, and the flow path forming plate is provided with a first flow path on the front surface thereof, and a second flow path on the rear surface thereof. In addition, a cooling water inlet and a cooling water outlet are provided on one side of the flow path plate, and the cooling water flowing through the cooling water inlet is discharged through the channel of the flow path plate through the cooling water outlet.

When the cooling water having a lower temperature than the wastewater is supplied to the channel inside the immersion membrane module, a temperature difference is generated between the first surface of the unit separation membrane contacting the wastewater and the second surface of the unit separation membrane contacting the cooling water, The moisture that is in contact with the first surface, which is relatively high temperature, is evaporated and changed into water vapor due to the temperature difference between the second surface and the water vapor passes through the unit separation membrane and moves to the second surface, The module is moved and merged with the cooling water.

The anaerobic bioreactor is operated in a downward flow. In addition, the operation of the anaerobic bioreactor may be such that the volume of the first fluid filtration media is expanded by 20 to 30% to supply the wastewater. In addition, the anaerobic bioreactor may be provided with any one of anaerobic granular sludge, sludge blanket, and immobilized anaerobic sludge instead of the first fluid filter medium, and the anaerobic bioreactor may be operated in an upward flow.

Wherein the first fluid medium or the second fluid medium is made of an organic polymer material having a porous surface, and the fluid medium is a hexahedron or a sphere made of any one of polyurethane, polypropylene, and polyethylene, or a polyurethane, a polypropylene, A sphere which is bundled with any one bundle of fiber yarns can be used. In addition, a plurality of rotary discs are provided apart from each other, and a separation membrane module is provided in a space between the rotary discs.

The method for treating membrane distillation-coupled anaerobic wastewater according to the present invention comprises a first step of introducing wastewater into an anaerobic bioreactor provided with anaerobic microorganisms, anaerobic treatment of the wastewater and methane gas generation, Is supplied to the anaerobic membrane distillation separator provided with the submerged membrane module and the second flowable filter medium, and the second step is carried out in which the wastewater filtration is performed by the submerged membrane module and the anaerobic membrane addition treatment in the anaerobic membrane distillation tank And a third step in which methane gas is generated. The rotary disk provided on both sides of the submerged membrane module is rotated to flow the wastewater of the turbulent flow and the second fluid filter media The method of claim 1, further comprising the step of removing contaminants, When the cooling water having a lower temperature than the wastewater is supplied to the flow path inside the submerged membrane module, the first surface of the unit separation membrane in contact with the wastewater and the second surface of the unit separation membrane in contact with the cooling water in the third step And the moisture that is in contact with the first surface, which is relatively high temperature, is evaporated and changed into water vapor by the temperature difference between the first surface and the second surface of the unit separation membrane, and the water vapor permeates through the unit separation membrane, And moves to the surface of the submerged separation membrane module, which finally contacts the second surface, and joins with the cooling water to filter the wastewater.

The apparatus and method for treating membrane distillation combined type anaerobic wastewater according to the present invention have the following effects.

The quality of the treated water can be improved by combining the bioreactor with the membrane distillation process. In addition, by applying a rotating disk and a flowable filter medium, it is possible to effectively reduce the contamination on the surface of the immersion membrane module even by using low energy, and by operating the bioreactor in an anaerobic state, biogas can be additionally obtained, .

In addition, since the anaerobic bioreactor section, in which the biological treatment is mainly performed, and the anaerobic membrane distillation separation tank, which mainly filters the treated water, are separated, The anaerobic bioreactor to be treated can maintain the absolute anaerobic condition, and it is possible to perform anaerobic treatment efficiently even when the membrane is replaced or repaired. In addition, since the operation conditions such as the residence time can be separated and managed optimally in each group, it is possible to operate according to each group characteristic, and the overall efficiency can be optimized.

1 is a perspective view of a membrane distillation-coupled anaerobic wastewater treatment apparatus according to an embodiment of the present invention.
2 is a perspective view of an anaerobic membrane distillation separation tank according to an embodiment of the present invention.
3 is a front view of an anaerobic membrane distillation separation tank according to an embodiment of the present invention.
4 is a side view of an anaerobic membrane distillation / separation vessel according to an embodiment of the present invention.
5 is an exploded perspective view of an immersion membrane module according to an embodiment of the present invention;
6 is a reference view for explaining a membrane distillation process using the submerged membrane module according to one embodiment of the present invention.

The present invention discloses a technique in which a membrane distillation process is combined with a biological treatment process. In the membrane distillation process, a difference in temperature is applied to both ends of the separation membrane to induce vaporization of water, and a vaporized water vapor is condensed and extracted, thereby remarkably improving the quality of the treated water. In the present invention, a membrane module is immersed in an anaerobic membrane separation tank, and detailed configuration and channel configuration of a membrane module for an optimal membrane distillation process are presented.

In addition, the present invention proposes a technique for generating biogas by operating an anaerobic membrane separation tank with an anaerobic tank, wherein a rotary disk is provided on both sides of the separation membrane module, and the rotary disk is rotated to contact the surface of the separation membrane The present invention proposes a technique capable of minimizing the adherence of contaminants to the surface of a separation membrane by providing a flowable filter medium in the anaerobic membrane separation tank.

In addition, according to the present invention, the anaerobic bioreactor is provided at the front end of the anaerobic membrane separation tank so that the biological treatment proceeds in the anaerobic bioreactor, and the filtration of the wastewater is progressed in the anaerobic membrane separation tank, And to improve the filtration efficiency of wastewater.

Hereinafter, an apparatus and a method for treating membrane distillation-combined anaerobic wastewater according to an embodiment of the present invention will be described in detail with reference to the drawings.

1, a membrane distillation-coupled anaerobic wastewater treatment apparatus according to an embodiment of the present invention includes an anaerobic bioreactor 110 and an anaerobic membrane distillation bio-reactor 200, do.

The anaerobic bioreactor 110 anaerobically processes the wastewater to generate biogas such as methane gas and treats pollutants in the wastewater. Specifically, the anaerobic bioreactor 110 is constructed in a cylindrical shape and operates in an anaerobic state, and has a plurality of first fluid filtering media 120 therein. The baffle 130 prevents the first fluid media 120 from separating from the upper and lower portions of the anaerobic bioreactor 110 and induces circulation and expansion of the first fluid filter media 120. Since the anaerobic microorganism is attached to the surface of the first fluid filter media 120, methane gas is generated simultaneously with the anaerobic treatment of the wastewater.

A biogas piping (not shown) for extracting biogas such as methane gas generated by the anaerobic microorganisms of the first fluid filter media 120 is provided at one side of the upper portion of the anaerobic bioreactor 110, The biogas is stored in the first biogas storage tank 140 via the biogas piping. In addition, a level sensor 150 for detecting the level of the anaerobic bioreactor 110 is provided at one side of the anaerobic bioreactor 110.

The wastewater flows into the upper part of the anaerobic bioreactor 110 and descends downward to discharge the effluent water from the lower part of the anaerobic bioreactor. The effluent of the anaerobic bioreactor 110 is supplied to the anaerobic membrane distillation / separation vessel 200 do. The wastewater flowing into the anaerobic bioreactor 110 is anaerobically treated with anaerobic microorganisms adhering to and growing on the surface of the first fluid filter media 120 and simultaneously produces biogas such as methane gas. During the downflow operation of the anaerobic biological reactor 110, a certain pressure is applied to expand the volume of the first fluid filter media 120 to a certain level, thereby expanding the surface area of the first fluid filter media 120 and increasing the activity of the anaerobic microorganism 120 Thereby increasing the treatment efficiency of the pollutants and the methane gas production efficiency. It is preferable to apply the pressure so that the expansion of the first flowing medium 120 is increased by 20 to 30% of the initial volume. In addition, it is preferable that the first fluid filtration media 120 is designed to be filled with the first fluid media 120 of 40 to 60% of the total volume of the anaerobic bioreactor 110.

The anaerobic bioreactor 110 may have various configurations. The anaerobic bioreactor 120 may be provided in the anaerobic bioreactor 110 so that anaerobic treatment of the wastewater can be performed. However, in the anaerobic bioreactor 110, the granular sludge, the sludge blanket, , And immobilized anaerobic sludge may be provided so that the wastewater can be anaerobically treated. When any one of the granular sludge, the sludge blanket, and the immobilized anaerobic sludge is used, the wastewater is supplied in the anaerobic bioreactor 110 as an upward flow. In addition, it is also possible to provide anaerobic suspended sludge in the anaerobic bioreactor 110. In this case, an agitation device is additionally provided in the anaerobic bioreactor 110.

Meanwhile, the anaerobic membrane distillation / separation unit 200 filters the wastewater discharged from the anaerobic bioreactor 110 using the separation membrane module, and further performs anaerobic treatment of the wastewater to induce generation of biogas. In order to maintain the anaerobic state, the anaerobic membrane distillation and separation vessel 200 is blocked from the external environment, and an air supply device provided in a conventional MBR tank, such as an aeration tank, is excluded.

2 to 4, the submerged membrane module 10 provided in the anaerobic membrane distillation / separation vessel 200 functions to filter contaminants in the wastewater through a membrane distillation process. The membrane distillation process is basically a process of filtering the contaminated water by applying a temperature difference to both ends of the separation membrane to evaporate and recover the water of the contaminated water. In the present invention, in order to realize the membrane distillation process, ) In detail are as follows.

The submerged membrane module 10 includes a flow path plate 210 and a unit separation membrane 220 (see FIG. 5). A flow path is formed on both sides of the flow path forming plate 210 and the unit separating film 220 is provided on both sides of the flow path forming plate 210. Here, the 'flow path' refers to the moving path of the cooling water, and the cooling water includes the treated water condensed through membrane distillation.

The flow path forming plate 210 includes a reference plate 211, a rectangular frame 212, and a center frame 213 in detail. The reference plate 211 is a flat plate having a predetermined area and a rectangular frame 212 is provided on the periphery of the reference plate 211 in a form orthogonal to the reference plate 211. The space inside the reference plate 211 is separated from the space outside the reference plate 211 by the rectangular frame 212 and the height of the square frame 212 is formed inside the reference plate 211 Is formed.

The center frame 213 is a linear frame having a predetermined height and a predetermined length. The center frame 213 is disposed in parallel with both sides of the rectangular frame 212 at the center of the reference plate 211. The center frame 213 is shorter than the length of the rectangular frame 212 arranged in parallel so that one end of the center frame 213 is connected to the square frame 212, And the other end is not extended to one end of the reference plate 211. With this structure, the space inside the reference plate 211 is formed into a U-shape by the square frame 212 and the central frame 213, and the space of the U- it means.

A square frame 212 and a center frame 213 are formed on one surface of the reference plate 211 so as to form a U-shaped flow path. Shaped square frame 212 and a central frame 213 to form a flow path. That is, a U-shaped channel is provided on both sides of the reference plate 211 as a center. In other words, the flow path forming plate 210 is provided with a first flow path on the front surface, a second flow path on the rear surface, and a reference plate 211 as a center. The rectangular frame 212 may be integrally formed on the front surface and the rear surface of the reference plate 211. The rectangular frame 212 may have a rectangular shape, And can be configured in various forms.

On the other hand, a cooling water inlet 214 and a cooling water outlet 215 are provided on the upper side of the rectangular frame 212. The cooling water is introduced through the cooling water inlet 214, and the introduced cooling water is discharged through the cooling water outlet 215 through the U-shaped channel. At this time, the cooling water inlet 214 and the cooling water outlet 215 are spatially connected to both the first flow path and the second flow path of the flow path forming plate 210. That is, the cooling water introduced through the cooling water inlet 214 is distributed to the first flow path and the second flow path, and the cooling water of the first flow path and the second flow path is discharged through one cooling water discharge port 215.

The unit separating film 220 is provided on the square frame 212 on the front and back sides of the flow path plate 210. [ The unit separation membrane 220 is in close contact with the rectangular frame 212 so that the flow paths of the flow path forming plate 210 (the first flow path and the second flow path) are isolated from the external environment. The unit separating membrane 220 is a porous hydrophobic separating membrane, and water can not directly pass through the unit separating membrane 220, and only water vapor can pass through the pores of the unit separating membrane 220.

The membrane distillation process using the submerged membrane module 10 in the state that the submerged membrane module 10 of the present invention has the above-described configuration will be described below (see FIG. 6).

The cooling water in the cooling tank 40 flows through the cooling water inflow port 214 of the flow path forming plate 210 to the first flow path and the second flow path through the cooling water inflow port 214 of the flow path forming plate 210 in the state where the wastewater discharged from the anaerobic membrane distillation / It is supplied in Euro. The cooling water supplied to the first flow path and the second flow path is discharged through the cooling water discharge port 215 through the U-shaped flow path, and the discharged cooling water is conveyed to the cooling tank 40. The cooling water is circulated repeatedly to the cooling tank 40 - the cooling water inlet 214 - the first flow path and the second flow path - the cooling water outlet 215 - the cooling tank 40.

The first surface 221 of the unit separation membrane 220 is in contact with the wastewater and the second surface 222 of the unit separation membrane 220 is connected to the cooling water flowing through the first and second flow paths. A temperature difference is generated between the first surface 221 and the second surface 222 of the unit separation membrane 220 as the cooling water is low in the temperature of the wastewater.

The moisture that is in contact with the first surface 221 which is relatively hot due to the temperature difference between the first surface 221 and the second surface 222 of the unit separation membrane 220 is evaporated and changed into water vapor, And then flows to the second surface 222 and finally to the first flow path and the second flow path in contact with the second surface 222 to join the cooling water. That is, the contaminants of the wastewater are filtered on the first surface 221 of the unit separation membrane 220, and only moisture is evaporated to move along the pores of the unit separation membrane 220, 222 to join the cooling water that moves through the first flow path and the second flow path. The wastewater is filtered through the process of generating steam by the temperature difference, the movement through the unit separation membrane 220, and the joining process with the cooling water. That is, the membrane distillation process using the submerged membrane module 10 of the present invention it means.

The submerged membrane module 10 of the present invention and the membrane distillation process using the submerged membrane module 10 have been described above. A plurality of the submerged membrane module 10 may be provided and the space between the cooling tank 40 and the cooling water inlet 214 and between the cooling tank 40 and the cooling water outlet 215 may be connected through a cooling water pipe 41 have. In addition, the temperature of the cooling water may be increased as the water condensed water is discharged to the cooling water. In order to keep the temperature of the cooling water constant, the cooling tank 40 may be controlled by a separate cooling device. At the same time, a treatment tank 50 for storing a predetermined amount of treated water may be provided at one side of the cooling tank 40.

On the other hand, as the membrane distillation process using the submerged membrane module 10 proceeds, the surface of the submerged membrane module 10, that is, the first surface 221, may be contaminated by the filtered contaminants. In order to prevent this, a rotating disk 20 and a second fluid filter medium 30 are provided in the anaerobic membrane distillation and separation tank 200.

Specifically, a rotary disk 20 is provided on both sides of the submerged membrane module 10. The rotary disk 20 is rotated by a motor 22 connected to one side and the rotation of the rotary disk 20 induces turbulent flow of the wastewater and ultimately removes contaminants attached to the surface of the separation membrane module 10 Thereby suppressing the adhesion of contaminants to the surface of the membrane module 10. The rotary disk 20 and the separator module 10 are spaced apart from each other by a predetermined distance and two rotary disks 20 provided on both sides of the separation membrane module 10 are connected to the motor 22 so that the two rotary disks 20 are simultaneously rotated by the driving of the motor 22. In another embodiment, it is also possible to independently drive each rotary disc 20 by connecting a motor 22 to each rotary disc 20. Meanwhile, the rotary disk 20 can be continuously installed on the shaft 21 with the separator module 10 interposed therebetween in accordance with the number of the separator module 10 installed. That is, a plurality of rotary discs 20 are provided apart from each other, and a separation membrane module 10 is provided in a space between the rotary discs 20.

The contamination of the separation membrane module 10 can be suppressed through the rotation of the rotary disk 20 and the second fluid filtering medium 30 can be added to further improve the contamination reduction effect of the separation membrane module 10. [ Specifically, a plurality of second fluid filter media 30 having a predetermined unit size is provided in the anaerobic membrane distillation and separation vessel 200, and the turbulent flow generated by the rotation of the rotary disk 20 2 flowable material 30 can be caused to flow so that the effect of desorbing the contaminant by the flow of the second flowable filter material 30 and the desorption of the contaminant through contact with the surface of the second flowable filter material 30 can be obtained .

The second fluid filter medium 30 is made of a porous material and the anaerobic microorganisms adhere to and grow on the surface and the pores of the second fluid filter media 30 to treat pollutants in the anaerobic membrane distillation / It is possible to generate biogas such as methane. Particularly, since the contaminants are treated by the anaerobic microorganisms on the surface of the second fluid filter media 30 and the concentration of the anaerobic microorganisms can be maintained at a high concentration, the concentration of the antioxidant substances Can be remarkably lowered and contamination of the submerged membrane module 10 can be remarkably reduced in comparison with an existing membrane-separation bioreactor in which the microorganisms are treated by the suspended microorganisms.

In addition, the second fluid filter media 30 may be a porous material to act as a habitat for the anaerobic microorganisms, and may be formed of a soft material such as polyurethane, polypropylene, or polyethylene, which does not damage the membrane when the membrane rubs against the surface of the membrane. , And the filter material has a diameter of 1 to 20 mm or a sphere, or a bundle of fiber yarns of the above-mentioned material is formed into a sphere.

A baffle (not shown) for preventing the second fluid filter media 30 from rising above the upper end of the separation membrane module 10 is provided on the upper part of the anaerobic membrane distillation and separation vessel 200. The anaerobic membrane distillation and separation vessel 200 is provided at one side thereof with a biogas piping (not shown) for extracting biogas such as methane gas generated through the anaerobic treatment process in the anaerobic membrane distillation and separation vessel 200 And the extracted biogas is stored in the second biogas storage tank 60 via the biogas piping. In addition, a level sensor for detecting the level of the anaerobic membrane distillation / separation vessel 200 is provided at one side of the anaerobic membrane distillation / separation vessel 200.

The configuration of the membrane distillation-coupled anaerobic wastewater treatment apparatus according to one embodiment of the present invention has been described above. Next, the operation of the membrane distillation-combined-type anaerobic wastewater treatment apparatus will be described.

When the wastewater flows into the anaerobic bioreactor 110, anaerobic treatment and methane generation of the wastewater proceeds. Specifically, when the wastewater flows into the anaerobic bioreactor 110 for a predetermined time as the anaerobic bioreactor 110 is operated in the anaerobic state, the anaerobic microorganisms flowing in the anaerobic bioreactor 110 and the first flowing filtration media 120 ) The anaerobic microorganisms attached to the surface react with the wastewater to decompose organic matter and generate methane gas. In carrying out anaerobic treatment and methane generation in the anaerobic bioreactor 110, the wastewater flowing into the anaerobic bioreactor 110 is transported downward, and the first fluidized filter media 120) is expanded by 20 to 30%.

As described above, the anaerobic bioreactor 110 may be a method of using either the granular sludge, the sludge blanket, or the immobilized anaerobic sludge in addition to the method of using the first fluidized filter material with the anaerobic microorganism attached thereto, It is also possible to use cast sludge.

The effluent discharged from the lower portion of the anaerobic bioreactor 110 is supplied to the anaerobic membrane distillation and separation tank 200. When the effluent of the anaerobic bioreactor 110 is supplied to the anaerobic membrane distillation and separation vessel 200, anaerobic treatment of the wastewater is performed in the anaerobic membrane distillation and separation vessel 200. As described above, the anaerobic membrane distillation and separation tank 200 maintains the anaerobic state in which the air supply is interrupted, the wastewater is retained in the anaerobic membrane distillation separation tank 200 for a predetermined time, and the anaerobic membrane distillation separation tank 200 ) And the anaerobic microorganisms attached to the surface of the second fluid filter media 240 are decomposed by the reaction of the anaerobic microorganisms and the biogas such as methane gas is generated and the generated biogas is stored in the biogas storage tank Lt; / RTI &gt;

As the anaerobic treatment process proceeds, a membrane distillation process is performed by the submerged membrane module 10, and contaminants of the wastewater are filtered by the submerged membrane module 10 by a membrane distillation process. Specifically, when cooling water having a temperature lower than that of the wastewater is supplied to the flow paths (first flow path and second flow path) in the submerged membrane module 10, the first surface 221 of the unit separation membrane 220 contacting with the wastewater, A temperature difference is generated between the second surface 222 of the unit separating film 220 and the first surface 221 of the unit separating film 220 and the second surface 222 of the unit separating film 220, The water contacting the surface 221 is evaporated and turned into water vapor and the water vapor passes through the unit separation membrane 220 and moves to the second surface 222 to finally reach the second surface 222, 2 &lt; / RTI &gt; and merged with the cooling water. The moisture of the wastewater is evaporated by water vapor, finally condensed and merged with the cooling water, and is discharged to the cooling tank 40, and contaminants of the wastewater are filtered by the unit separation membrane 220.

Meanwhile, the anaerobic treatment process and the membrane distillation process are performed, and the pollutant removal process on the surface of the submerged membrane module 10 proceeds. The second fluid filter media 30 is filled in the anaerobic membrane distillation and separation vessel 200 and the rotary disk 20 provided at both sides of the separation membrane module 10 is rotated so that the separation membrane module 10 And at the same time, contaminants on the surface of the membrane module 10 are removed through the second fluid filter media 30, which flows by the rotation of the rotary disk 20. The rotation of the rotary disk 20 is operated during the filtration process, and may be intermittently operated.

110: Anaerobic bioreactor 120: First fluidized filter media
130: Baffle 140: First biogas storage tank
150: Level sensor
10: Deposition membrane module 20: Rotary disk
21: shaft 22: motor
30: second fluid filter media 40: cooling tank
41: cooling water piping 50: treated water tank
60: Second biogas storage tank 200: Bioreactor
210: flow path forming plate 211: reference plate
212: square frame 213: central frame
214: cooling water inlet 215: cooling water outlet
220: unit separation membrane 221: first surface of the unit separation membrane
222: second surface of the unit separation membrane

Claims (18)

An anaerobic bioreactor for anaerobic treatment of wastewater and generating methane gas;
An anaerobic membrane distillation separation tank for subjecting the outflow wastewater of the anaerobic bioreactor to wastewater filtration by an immersion membrane module and an additional anaerobic treatment space of wastewater;
An immersion separation membrane module provided in the anaerobic membrane distillation separation tank for filtering wastewater; And
And a rotatable disk provided on both sides of the submerged membrane module for inducing turbulent flow of the wastewater and flow of the fluid medium through rotation,
And a flow path through which the cooling water is moved is provided in the submerged membrane module, and the water of the wastewater is evaporated by the temperature difference between the wastewater and the cooling water,
The submerged membrane module may include:
A flow path forming plate in which a flow path through which the cooling water is moved is formed,
And a unit separator provided on the front and back surfaces of the flow path plate for separating the flow path from the external environment and filtering contaminants in the wastewater,
The flow path plate includes a reference plate, a rectangular frame, and a central frame,
A rectangular frame is provided on the periphery of the reference plate so as to be orthogonal to the reference plate, the center frame is disposed in parallel with both sides of the rectangular frame at a central portion of the reference plate,
Wherein the space inside the reference plate forms a U-shaped flow path by the square frame and the center frame.
2. The anaerobic bioreactor according to claim 1, wherein the anaerobic bioreactor includes a plurality of first fluid filter media, a plurality of second fluid filter media in the anaerobic membrane distillation /
Wherein the anaerobic microorganisms are attached to the surfaces of the first fluid filtration media and the second fluid filtration media.
delete delete [2] The apparatus as claimed in claim 1, wherein a square frame and a center frame are provided on the front surface and the rear surface of the reference plate, and a first flow path is provided on the front surface of the flow path plate, Wherein the anaerobic wastewater treatment apparatus is a membrane distillation combined type anaerobic wastewater treatment apparatus.
2. The membrane separation apparatus according to claim 1, wherein a cooling water inlet and a cooling water outlet are provided on one side of the flow path plate, and the cooling water introduced through the cooling water inlet is discharged through a channel of the channel forming plate through a cooling water outlet. Type anaerobic wastewater treatment device.
[3] The membrane-separation membrane module of claim 1, wherein the unit separation membrane comprises a porous hydrophobic separation membrane, the moisture of the wastewater can not pass through the unit separation membrane, and only water vapor passes through the pores of the unit separation membrane. Anaerobic wastewater treatment system.
The method of claim 1, wherein when the cooling water having a lower temperature than the wastewater is supplied to the flow path inside the submerged membrane module, a temperature difference is generated between the first surface of the unit separation membrane in contact with the wastewater and the second surface of the unit separation membrane in contact with the cooling water, The moisture that is in contact with the first surface, which is relatively high temperature, is evaporated and changed into steam due to the temperature difference between the first surface and the second surface of the separation membrane. The water vapor passes through the unit separation membrane and moves to the second surface, Wherein the submerged membrane module contacting the surface of the submerged membrane module is moved and merged with the cooling water.
The apparatus for treating anaerobic wastewater according to claim 1, wherein the anaerobic bioreactor is operated in a downward flow.
3. The membrane distillation-coupled anaerobic sewage treatment system according to claim 2, wherein the operation of the anaerobic bioreactor is such that the volume of the first fluid filter medium is expanded by 20 to 30% to supply the wastewater.
The anaerobic bioreactor according to claim 1, wherein the anaerobic bioreactor is provided with any one of anaerobic granular sludge, sludge blanket, and immobilized anaerobic sludge, and the anaerobic bioreactor is operated in an upward flow direction. Wastewater treatment device.
[Claim 3] The method of claim 2, wherein the first fluid medium or the second fluid medium comprises an organic polymer material having a porous surface,
Wherein the fluid filter material is a hexahedron or a sphere made of any one of polyurethane, polypropylene and polyethylene, or a sphere formed of a bundle of any one of polyurethane, polypropylene and polyethylene fibers. Wastewater treatment device.
The apparatus for treating anaerobic wastewater according to claim 1, wherein a plurality of rotary discs are spaced apart and a separation membrane module is provided in a space between the rotary discs.
delete delete delete delete delete

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