RU588U1 - Installation of deep biological treatment of domestic wastewater - Google Patents

Abstract

Installation of deep biological treatment of domestic wastewater, containing an anaerobic block, an aerobic block and a filtration block placed sequentially in the direction of movement of the treated water, as well as a system of process pipelines for the passage of treated water and sludge, characterized in that the anaerobic block consists of separate and sequentially placed anaerobic bioreactor and sump, interconnected by a return sludge pipe with a circulation pump and shut-off with an armature, the aerobic block includes two successively arranged steps, each of which contains aeration tank and settler arranged separately and arranged in series, interconnected by a return sludge pipeline, while an ejector-airlift system with a closed system is used in each aeration tank gas circuit, the filtration unit consists of a pressure-free filling filter equipped with an ejector-air-lift system for regenerating the load, and a sump, moreover, the drain pipe The filter wash water is connected to the sump, and the drain pipelines of the second stage sump of the aerobic block and the sludge of the filter block are connected to the filter through the ejector-air-lift recovery regeneration system, the filter also has a purified water drain pipe, while all the sumps are connected through a pipe connected to the circulation suction pipe pump, connected to the anaerobic bioreactor, and the sump of the anaerobic block has a pipeline to remove mineralized sediment.

Description

Installation of deep biological treatment of domestic wastewater

-u MKI from 02 I 3/00

The utility model relates to devices for biological treatment of domestic wastewater and can be used to equip l: large-scale sewage systems of small towns and small objects - boarding houses, hotels, etc.

Known Installation for microbiological wastewater treatment according to the author's certificate of the USSR No. 1754668 (L1). This installation contains an anaerobic water treatment unit with a heating system and an aerobic water treatment unit with an aeration system, made from a number of communicating sections and having a load of synthetic material,

The unit is equipped with a system of perforated air supply pipelines in the section of the aerobic block for aeration of the treated water, movement of wastewater, and so on for the purpose of periodic regeneration of the load;

Removal of excess biomass is provided from all sections of the aerobic block,

To achieve the required degree of wastewater treatment with this unit, either high energy consumption for the aeration system and high IE intensity of water circulation in the airlift channels or large dimensions of the anaerobic and aerobic blocks to create a sufficient number of consecutive sections in them is required, which leads to high static the characteristics of the installation, n It is also known and closest in technical rigidity Installation for microbiological wastewater treatment according to the author to the USSR Travel Agency No. 1161481 (12), the installation comprises an anaerobic water treatment unit, an aerobic water treatment unit, and a filtration unit. The anaerobic processing unit is equipped with a water heating system connected to the hot water line. This unit consists of a number of adjacent chambers with settling tanks, constructed in such a way that the possibility of sequential overflow of drains from chamber to chamber is ensured. The chambers are loaded with synthetic material to immobilize microorganisms in the form of cassettes, which are a set of foam plates. The aerobic processing unit is structurally similar to the .. anaerobic unit, except that it does not have a water heating system, and the chambers are equipped with water aeration devices connected to the compressed air line. The sedimentation tanks of the anaerobic and aerobic blocks are connected to common 1U at the sediment removal pipeline. The final purification and clarification of water takes place in the filtration unit.In this installation, the biological wastewater treatment process is mainly immobilized on microorganism loading cassettes in all chambers of the anaerobic and aerobic blocks, which is not efficient enough and significantly increases the mass-dimensional and cost characteristics of the structure. .

the process of disposal of disposable sediments due to their large amount, low degree of mineralization and high humidity.

The inventive utility model Installation of deep biological treatment of domestic wastewater is aimed at solving such problems as achieving high efficiency of sewage treatment, improving operational characteristics and reducing capital costs during construction.

The tasks are solved due to the fact that the installation of deep biological treatment of domestic wastewater, containing an anaerobic block, an aerobic block and a fishery block placed sequentially in the direction of movement of the treated water, as well as a system of process pipelines for the passage of treated water and sludge removal, has the following features

Anaerobic block consists of separately performed and sequentially placed anaerobic bioreactor and sump, interconnected by a return sludge pipeline with a circulation pump and shut-off and control valves.

The aerobic block includes two successively arranged steps, each of which contains aeration tank and sump arranged separately and arranged in series, connected by a return sludge pipeline, while an ejector-airlift system with a closed gas circuit is used as an aeration system in each aeration tank.

The filtration unit consists of a pressure-free filling filter equipped with an ejector-airflow charge recovery system, and a sump, moreover, the drain pipe for the filter wash water is connected to the sump, and the drain pipelines of the second stage sump of the aerobic block and the block sump

filtration through an ejector-air-lift. The regeneration system of the load is connected to the filter. The filter also has a purified water discharge pipe,

All sedimentation tanks through a pipeline connected to the suction pump of the inlet pump (at pump nozzle 1, are connected to an anaerobic bioreactor,

and the sump of the anaerobic block has a pipeline to remove mineralized sediment.

The inventive installation allows you to implement a four-stage sewage treatment shed.

The use of two successive aerobic steps, where the first stage aeration tank works in high mode and the second stage aeration tank works in low load on biomass, provides a deeper cleaning effect. This is achieved due to the fact that various biological conditions are created in aerotanks that are characteristic of the corresponding degree of pollution of sewage. Moreover, in the biomass of the aeration tank of the first stage, mainly bacteria function, and in the second stage, the simplest microorganisms that process the organic matter of dead bacterial cells, which leads to an improvement in the quality of purification and to a decrease in the growth of sludge (LZ),

The use of a circulation pump in the anaerobic block ensures the removal of part of the return moisture from all settlers into the bioreactor, as well as maintaining the biomass of the microorganisms of the bioreactor in suspension by the upward circulation flow. At the same time, good contact of microorganisms with pollutants is achieved.

The use of ejector-airlift systems in both stages of the aerobic block as aeration systems allows for the intensive circulation of the water-silt mixture in aeration tanks, providing intensive mass transfer between gas and: liquid, as well as between microorganisms and pollutants.

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In addition, the gas-lift and hydraulic lift effects arising in ejector-airlift systems provide a continuous supply of part of the return sludge from. sedimentation tanks in aeration tanks without the use of additional technical means. In this case, ejector-airlift systems; characterized by the simplicity and reliability of the equipment, and the use of a closed gas circuit can significantly reduce energy consumption.

Equipping a pressureless fjätter operating according to a super-downward circuit with an ejector-air-lift loading regeneration system makes it possible to carry out this regeneration in a continuous mode, which eliminates the need for a periodic stop of the filtering unit for washing rinsing after the end of each filter cycle.

The implementation of all sedimentation tanks in the form of separate structural units is associated with the need to calm the intense circulation flows of the water-sludge mixture in them, and also allows to simplify the processes of manufacturing, transportation and installation of units of the Unit,

In the Installation, the water removal scheme is constructed in such a way that part of the return sludge from the sumps in both steps of the aerobic block is returned to its aerotanks, and the other part is sent to the bioreactor. All the sludge from the sump of the filtration unit and part of the sludge from the sump of the anaerobic block are sent. This only removes the mineralized sediment from the sedimentation tank of the anaerobic block. Such a scheme can significantly alleviate the problem of sludge utilization, since anaerobic treatment of excess biomass results in 5-10 times less than aerobic treatment (13), while mineralized sludge can be further dehydrated much more easily. Regulating valves allow regulating the flow of sludge returned from sedimentation tanks in the bioreactor, and the amount of sediment removed from the installation. As a result, the implementation of the Installation described in the way allows you to solve the tasks - achieving a high degree

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sewage treatment, improved performance, reduced capital costs during construction.

On Fig presents a functional diagram of the Installation of deep biological treatment of domestic wastewater, and in Fig, 2 - its technological scheme.

The deep biological treatment plant for household wastewater consists of an anaerobic block (I), an aerobic block (2) and a filtration block (3) arranged in series in the direction of movement of the treated water, connected by a system of process pipelines for passing the treated water (4) and sludge (5) ,

The anaerobic block (I) consists of a sequentially placed anaerobic bioreactor (6) and a sump (7), interconnected by a return sludge pipeline with shut-off and control valves (not shown in FIG. 1) and a cirque pump (8),

The aerobic block (2) includes two sequentially located steps (I and P), which can have the same design

Each of the two steps (I and P) of the aerobic block (2), respectively, consists of a successively placed aeration tank (9 and 12) with an ejector-airlift aeration system (10 and 13) and a sump (II and 14) connected by a return sludge pipeline

The filtration unit (3) consists of a pressure-free filter (15) equipped with an ejector-air-lift system (16) for regenerating the load and a sump (17). Moreover, the drain pipe for washing the filter water (15) is connected to the sump (17), and the drain pipes of the sumps (14 and 17) through the ejector-erogift system (16) are connected to the filter (15) 7 In addition, the filter (15)

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mites the drainage pipe for purified water.

The sumps (7,11,14,17) of all units of the Unit are connected through the pipeline connected to the suction pipe of the circulation pump (8) to the anaerobic bioreactor (6), and the sump (7) of the anaerobic block has a pipe for

removal from the Installation of mineralized sediment, Bioreactor (6) of the anaerobic block (1)

a metal container, made, for example, in a forile of a rectangular parallelepiped having a catchment tray with a spillway in the upper part. In this case, the sewage supply pipe and the pressure pipe of the circulation pump (8) are connected to the lower part of the bioreactor body.

All sedimentation tanks (7,11,14,17) of the Unit may be of the same design, representing, for example, a metal tank consisting of an upper rectangular parallelepiped and a lower part in the form of an overturned truncated pyramid. In the upper part of each of the settlers there is a pipeline for supplying purified water with a feed tray, and at the opposite end of the corusus there is a collection tray with a spillway. A sludge drain pipe is connected to the pyramidal part of the base of each settler.

By accelerating the process of sedimentation of sludge, thin-layer modules can be installed in sedimentation tanks.

As a circulation pump (8), for example, a typical fecal pump of the grade Zh can be used.

Aerotanks (9 and 12) of both steps of the aerobic block can be identical and made, for example, in the form of open metal containers, similar to the capacity of an anaerobic bioreactor (6),

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The ejector-airlift aeration systems (10 and 13) used in both steps of the aerobic block (2) are similar, each of them (cm, fng, 2) consists of a vertical airlift pipe (18 and 23) and a water-air ejector (19 and 24), respectively ), circulation pump (20 and 25), gas cap (21 and 26) and water seal (22 and 27)

At the same time, in the center of each of the aeration tanks (9 and 12), a vertical airlift pipe (18 and 23, respectively) is installed with a lower diffuser located at a certain distance from the bottom and an upper diffuser located above the water level in the aeration tank,

The water-air ejector (19 and 24) consists of a cone, in the cone nozzle, an inlet chamber. And an elongated cylindrical mixing chamber QE is located above the water level in the aeration tank and is equipped with a drain pipe connected to the central part of the lower diffuser of the airlift pipe (18 and 23 respectively).

The suction pipe of the circulation pump (20 and 25) is located in the lower part of the aeration tank housing (9 and 12, respectively), and the pressure pipe of the pump (20 and 25) is connected to the nozzle of the water-air ejector (19 and 24, respectively), as circulation pumps (20 and 25) can be used, for example, typical Zh-type fecal pumps. A gas cap (21 and 26, respectively) is mounted over the airlift pipe (18 and 23) in the form of an overturned cylinder with a cone-shaped tip lowered under the water level in the aeration tank,

The air cavity of the gas cap (21 and 26) is connected respectively to the suction pipe of the water-air ejector (19 and 24) and the discharge pipe of the hydraulic seal

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(22 and 27), the latter is made in the form of a pipe segment, muffled from above and lowered the lower open end under the water level in the aeration tank. The discharge pipe is connected to the upper plugged1 end of the hydraulic lock, and the supply air pipe is passed through it and lowered at one end to the water level in the hydraulic lock. The second end of the air supply pipe is connected to the atmosphere. To the lower diffuser of the airlift pipe (18 and 23), in addition to the pipe for supplying purified water from the previous unit (7 and II), a pipe for returning sludge from its own sump (II and 14) is also connected. To intensify the cleaning process in the middle part of the bioreactor (6) and aeration tanks (9 and 12), submersible flat nozzles can be installed to fix microorganisms. In this case, the regeneration of the nozzles will occur automatically, thanks to the intensively circulating flow of wastewater, washing away “the excess biomass from the nozzles

The filter (15) of the filtration unit (3) is (see FIG. 2) an open metal container consisting, for example, of an upper rectangular parallelepiped having a catchment tray with a spillway in the upper part and the lower part in the form of an overturned truncated pyramid,

The filter capacity is partially filled with a granular load (28), for which, for example, quartz sand of a certain size can be used. In the lower part of the pyramidal base of the filter there is a drainage cap and a pipe for discharging purified water,

The ejector-airlift system (16) for continuous regeneration of the filter load (15) is basically similar to the ejector-airlift aeration systems (10 and 13) of aeration tanks (9 and 12, respectively) of both stages of the aerobic block (2). It consists of a vertical airlift pipe (E9), a water-air ejector (30), a gas cap (31), a water trap (32) and a circulation pump (33), located mainly as in an aerobic block. The difference lies in the fact that two drain pipes of the sump (17) of the filtration unit and sump (14) are connected to the suction pipe of the circulation pump (33) at the stage of the aerobic block, and the drain pipe of the ejector is not located three or three but outside the filter body (15 )at

As shut-off and control valves, fittings traditionally used in the equipment of internal sewerage networks - valves, valves, taps, - for example (see, fig. 2), in the form of two valves (34 and 35), installed respectively on the pressure and the suction pipelines of the circulation pump (8) of the anaerobic block, the tap (36) on the return sludge pipe, leaving the sump (7) and the tap (37) on the outlet pipe for removing sludge from the Unit.

Installation works as follows. The movement of purified water through all the bio-units of the Unit is carried out by gravity due to the appropriate location of its units in height. Mechanical wastewater that has undergone preliminary purification enters through the pipeline (4) to the lower part of the bioreactor (6) of the anaerobic block (I). The bioreactor (6) operates in the continuous mixing mode of the mixture of purified water and sediment (sludge) in the upward flow layer. The sludge circulation in the bioreactor (6) and the supply of return sludge to it from the settlers of all blocks is provided by a pump (8)

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anaerobic block

The purified water is collected in the upper part of the bioreactor by a collection tray with a spillway. From the bioreactor (6), the purified water with sludge enters the sump (7), where the intensive circulation flows of the sludge mixture are calmed and the water is separated from the sediment. In this case, the sludge mixture with the help of the upper feed tray is evenly distributed over the cross section of the sump, and the purified water is collected by a collection tray.

The sediment enters the pyramidal part of the sump (7) - the compaction zone, part of it is returned to the bioreactor via Tpy6onpoBOj y of return sludge to intensify the cleaning process, and the excess is removed from the Unit through the outlet pipe; -.

From the anaerobic block (I), the treated wastewater enters the aerobic block (2) through the water supply pipe.In the aerotank (9) of the first stage, aerobic biological treatment of the wastewater is carried out under high load on the biomass, which helps to reduce the duration of the process in it. Here the processes of oxidation of easily oxidized organic substances and the conversion of difficultly oxidized organic substances to a dissolved state take place. Cleaning is carried out by a set of microorganisms in suspension in the form of activated sludge (bacterial cells that are at the stage of exponential growth).

The required amount of oxygen is supplied to the aeration tank and the sludge mixture is circulated in it using an ejector-airlift aerator (18,19,21,22) working with a circulation pump (20) “When the circulation pump

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pump (20) the sludge mixture through the suction pipe is taken from the aeration tank (9) and fed to the nozzle of the water-air ejector (19). The ejector sucks the gas mixture from under the gas cap (21), creating a corresponding vacuum under it, due to which the water level in the gas the cap (21) rises above the water level in the aeration tank (9), Atmospheric air automatically enters under the gas cap (21) through a water seal (22), the Tazoyl mixture through the drain pipe of the ejector (19) is transferred to the lower part of the airlift pipe (18), due to airlift effect him when the allocation of air bubbles in the airlift pipe (18), formed by an upward movement of sludge CMecKs Issuing from the gas cap (21) gas-sludge mixture flows into the annulus of the aeration tank, between the housing and the airlift pipe where it is mixed with the supplied cleaning waste water.

In the annular space, a downward movement of the sludge mixture is formed, which is sucked into the airlift pipe (18). In this case, the downward flow picks up tiny gas bubbles with a whirling speed lower than the speed of the circulation flow. High multiplicity of circulation provides intensive mass transfer in the aeration tank (9),

The purified water is collected in the upper part of the aeration tank by a collection tray with a spillway, after which it flows through the pipeline to the sump (II),

In the sump (II) of the I stage of the aerobic block (2), the sediment is separated from the purified water after passing the aeration tank (9), The principle of operation of the sump (II) is similar to the sump (7) of the anaerobic block (I), while part of the sludge discharged from the sump ( II) through the return sludge pipeline under the influence of gas-lift and hydraulic lift effects

16- 3D37 1

back to the aeration tank (9) to increase its oxidative power. After passing the I stage, the purified water enters the P stage of the aerobic block (2), the principle of which is similar to the I stage.

After passing through the aerobic block (2), biologically purified water is supplied to the filtration block (3), where it is finally treated and clarified. At the same time, water from the sump (14) through a circulation pump (33) through the ejector (30) enters the lower part of the filter housing (15), under the lower diffuser of the airlift pipe (29). The principle of operation of the ejector-air-lift system (29,30,31,32,33) of the filter (15) is similar to the work of the ejector-air-lift system of the aerobic block (2). Filtration is carried out through a granular charge (28) according to the top-down scheme. regeneration of the load (28), carried away into the airlift pipe (29) under the influence of gas-lift and hydraulic lift effects. Dirty water is collected by a collection tray and gravity is discharged through a wash water pipeline to a sump (17), and the loading particles are returned to the filtration zone. Wash water from the sump (17) through the drain pipe using a pump (33) is returned to the filter (15), where it is treated and clarified. The purified water through the drainage cap enters the pipeline for the removal of purified water.

From the output of the Unit, treated wastewater after its disinfection can be discharged directly into water bodies of drinking water without additional dilution with clean water.

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pump (8) into the anaerobic bioreactor (6), where it is mineralized. The mineralized sludge is removed from the Unit through an outlet pipeline leaving the anaerobic block from the sump (7). At the same time, the shut-off and control valves in the valve gate (34 and 35) and valves (36 and 37) provide the ability to control sludge flows and the optimal operating mode of the anaerobic block () "

USEFUL USE GIVEN

H. Inclusion of the invention to the author’s CEE Office of the USSR No. 1754668 Installation for microbiological treatment: wastewater, GZhJ02 3/00, priority from I6.IO, 90rv, publ. B Of.Bvzl,) 30 from 15.08.92gv

2. Description of the invention to the author's certificate of the USSR No. II6I48I Installation for microbiological wastewater treatment, 1ZHI C02 3/00, priority from 07/13/83, published in Office No. 22 from 06/15/85 GW

Z. Razumovsky E, S. Deep wastewater treatment, Uzh 628.31, Water Supply and Sanitary Technique 6, 1992

4; Semenovsky Yu.V., Strizhov A.M.Ejector-airlift aerators, UDC 628.356.3, the Journal of Water Supply and Sanitary Engineering No. 6, 1992

„/ Out.

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Claims (1)

Installation of deep biological treatment of domestic wastewater, containing an anaerobic block, an aerobic block and a filtration block placed sequentially in the direction of movement of the treated water, as well as a system of process pipelines for the passage of treated water and sludge, characterized in that the anaerobic block consists of separate and sequentially placed anaerobic bioreactor and sump, interconnected by a return sludge pipe with a circulation pump and shut-off with an armature, the aerobic block includes two successively arranged steps, each of which contains aeration tank and sump arranged separately and arranged in series, interconnected by a return sludge pipeline, while an ejector-airlift system with a closed system is used in each aeration tank gas circuit, the filtration unit consists of a pressure-free filling filter equipped with an ejector-air-lift system for regenerating the load, and a sump, moreover, the drain pipe The filter wash water is connected to the sump, and the drain pipelines of the second stage sump of the aerobic block and the sludge of the filter block are connected to the filter through the ejector-air-lift recovery regeneration system, the filter also has a purified water drain pipe, while all the sumps are connected through a pipe connected to the circulation suction pipe pump, connected to the anaerobic bioreactor, and the sump of the anaerobic block has a pipeline to remove mineralized sediment.