CN217297602U

CN217297602U - Rural domestic sewage biological treatment system

Info

Publication number: CN217297602U
Application number: CN202220358860.2U
Authority: CN
Inventors: 慕登琰
Original assignee: Shaanxi Shengyuan Environmental Technology Co Ltd
Current assignee: Shaanxi Shengyuan Environmental Technology Co Ltd
Priority date: 2022-02-22
Filing date: 2022-02-22
Publication date: 2022-08-26
Anticipated expiration: 2032-02-22

Abstract

The utility model discloses a rural domestic sewage biological treatment system, which comprises a pretreatment tank, a DTBT reactor, a DTBAF reactor and a clean water tank which are connected in sequence; the pretreatment tank is connected with a domestic sewage inlet pipe, and the middle part of the pretreatment tank is communicated with the DTBT reactor through a pipeline; the DTBT reactor comprises a tank body, and an aeration system is arranged at the bottom in the tank body; a water pump and a lifting pipeline are also arranged in the tank body, and the far end of the lifting pipeline is communicated with the DTBAF reactor; the DTBAF reactor comprises a reactor shell, the inner cavity of the reactor shell is divided into a first reaction chamber and a second reaction chamber, and the second reaction chamber is in overflow connection with the first reaction chamber; a biological filter material layer, a ceramsite filter material layer and a back washing system are sequentially arranged in the second reaction chamber from top to bottom; a treatment liquid outlet is arranged at the position of the second reaction chamber below the biological filter material layer and is connected with a clean water tank through a liquid discharge pipe; the back-flushing system is used for flushing impurities in the biological filter material layer and the ceramsite filter material layer.

Description

Rural domestic sewage biological treatment system

Technical Field

The utility model belongs to the technical field of the environmental protection equipment, concretely relates to sewage treatment system, more specifically relates to a rural domestic sewage biological treatment system.

Background

At present, most domestic sewage in rural areas of China is directly discharged, so that river and pond pollution is caused, the living environment of the rural areas is influenced, and the physical health of farmers is seriously threatened. At present, the problems of weak infrastructure construction, incomplete drainage system and sewage treatment construction and the like generally exist in rural areas. At present, rural sewage treatment mainly comprises two processes, one is a Membrane Bioreactor (MBR) process, and the other is an artificial wetland process. The membrane bioreactor is the combination of membrane separation technology and activated sludge biotechnology, and the high-efficiency solid-liquid separation of the membrane bioreactor ensures that the effluent has good water quality, suspended matters and turbidity are close to zero, and the domestic sewage can be directly recycled after being treated. The sewage is firstly anaerobically digested by a septic tank, and the organic matter load is reduced.

The rural domestic sewage treatment is an important measure for improving the rural living environment and realizing poverty removal and hardness removal in rural areas. Rural domestic sewage has the characteristics of dispersed layout, small scale, large water quantity change range and the like, so that the mature sewage treatment process in cities and towns is not suitable for rural sewage treatment. On the premise of considering the characteristics of rural domestic sewage and discharge landmarks, the project develops a sewage treatment technology with simple, mature and reliable process and realizes demonstration application. The demonstration project realizes the normal operation of the sewage treatment project on the premise of reducing investment and daily operation cost and reducing management difficulty, and explores a feasible way for the treatment of rural domestic sewage.

SUMMERY OF THE UTILITY MODEL

The utility model provides a rural domestic sewage biological treatment system, the purpose is to the dispersion of site selection among the rural domestic sewage treatment, the water yield water quality change is big, the scale is little, current domestic sewage treatment technique does not adapt to rural sewage treatment's actual conditions very much, the sewage treatment technique who is applicable to rural socioeconomic characteristics has been developed, with handling rural distributed resident domestic sewage and burying distributed sewage treatment and recycling technique for a rural domestic sewage treatment system that represents, in the day, the low consumption processing of sewage volume large amplitude variation in the year has been realized, improve and green development provides technical support for our provincial rural area rural human settlement environment.

Therefore, the utility model adopts the following technical scheme:

a rural domestic sewage biological treatment system comprises a pretreatment tank, a DTBT reactor, a DTBAF reactor and a clean water tank which are connected in sequence;

the pretreatment tank is connected with a domestic sewage inlet pipe and used for removing large-volume and large-density impurities in the domestic sewage, and the middle part of the pretreatment tank is communicated with the DTBT reactor through a pipeline;

the DTBT reactor comprises a tank body, and an aeration system is arranged at the bottom in the tank body; a water pump and a lifting pipeline are also arranged in the tank body, and the far end of the lifting pipeline is communicated with the DTBAF reactor;

the DTBAF reactor comprises a reactor shell, the inner cavity of the reactor shell is divided into a first reaction chamber and a second reaction chamber, the second reaction chamber is in overflow connection with the first reaction chamber, and the lifting pipeline is connected with the first reaction chamber; a biological filter material layer, a ceramsite filter material layer and a back washing system are sequentially arranged in the second reaction chamber from top to bottom; a treatment liquid outlet is arranged at the position of the second reaction chamber, which is positioned below the biological filter material layer, the treatment liquid outlet is connected with a clean water tank through a liquid discharge pipe, and a liquid discharge valve is arranged on the liquid discharge pipe; the back flushing system is used for flushing impurities in the biological filter material layer and the ceramsite filter material layer, and a back flushing liquid outlet is formed in the position, above the biological filter material layer, of the second reaction chamber.

Further, the height of the outlet of the liquid discharge pipe is positioned between the bottom layer and the top layer of the biological filter material layer.

Furthermore, the back washing system comprises a liquid washing coil and an air washing coil, wherein the liquid washing coil is connected with a liquid spray head, and the air washing coil is connected with an air spray head.

Furthermore, the far end of the liquid flushing coil pipe is connected with a flushing pump, and a liquid inlet pipe of the flushing pump is connected with a clean water tank; the far end of the gas flushing coil is connected with a blower.

Furthermore, the height of the backwash liquid outlet is lower than that of the overflow liquid inlet of the second reaction chamber, and the backwash liquid outlet is communicated to the pretreatment tank through a sewage discharge pipeline.

Furthermore, a sewage draining outlet is formed in the bottom of the first reaction chamber and communicated to the pretreatment tank through a sewage draining pipeline.

Furthermore, a vertically downward guide pipe is arranged in the center of the first reaction chamber, and the lower end of the guide pipe extends to the lower part of the first reaction chamber; the outlet of the lifting pipeline is connected with the top of the flow guide pipe, and a conical liquid dispersion guide plate is arranged right below the outlet of the flow guide pipe.

Further, the bottom of the first reaction chamber is tapered.

Further, the pretreatment tank and the DTBT reactor are both arranged below the ground, and the DTBAF reactor and the clean water tank are arranged on the ground.

Further, the pretreatment tank comprises a grid tank and a grit chamber, and the grit chamber is in overflow connection with the grid tank; the domestic sewage inlet pipe is connected with the grid tank, and the middle part of the grit chamber is communicated with the DTBT reactor through a pipeline.

The haydite filtering material layer is produced with high quality pottery clay, solvent, etc. and through ball milling, sieving and calcining. The ceramsite filter material has the characteristics of hard surface, microporous interior, high porosity and the like. Aerobic activated sludge is used as inoculation, and the treatment effect can be achieved by feeding water for two weeks.

The biological filter material adopts spherical suspended filler, also called porous rotary spherical suspended filler, and the suspended ball filler is a latest series product developed in various fillers adopted in domestic sewage treatment and biomembrane treatment technologies. This patent product adopts in the wing 100mm specification.

The filler series is formed by injection molding of polypropylene materials, and is divided into an inner layer sphere and an outer layer sphere, wherein the outer part of the inner layer sphere is a hollow fishnet-shaped sphere, and the inner part of the inner layer sphere is a rotary sphere. The biological membrane carrier has the functions of a biological membrane carrier, also has the function of intercepting suspended matters, has the characteristics of strong biological adhesive force, large specific surface area, high porosity, good chemical and biological stability, durability, no harmful substances dissolved out, no secondary pollution, ultraviolet resistance, ageing resistance, strong hydrophilic performance and the like, and is easy to generate, easy to replace, resistant to acid and alkali, ageing resistant, free from water flow influence, long in service life, less in residual sludge and convenient to install in the using process.

The biological filter material and the ceramsite filter material are used as carriers for the survival of microorganisms, so that the microbial biomass is increased, and the efficiency of sewage treatment is improved.

The beneficial effects of the utility model reside in that:

1. in the whole treatment process, 1 air blower, 1 water pump and 1 flushing pump are used as electric equipment, so that the operation cost is saved, the failure rate is reduced, and the operation complexity is reduced;

2. the utility model is in an intermittent operation mode, and is automatically controlled by a PLC, aerated in the daytime and discharged at night, so that the water is discharged without being attended by a special person and is operated fully automatically, thereby solving the difficult points that the traditional integrated equipment needs to be operated by the special person and has high requirements on operators;

3. the utility model can better adapt to the practical problems of small seasonal water quantity and large fluctuation change of water quantity of rural sewage, and solves the problem that other processes can not normally operate;

4. the utility model discloses the carrier adopts the immobilized biotechnology, has that the mass transfer is effectual, and shock resistance load is strong, advantages such as practical year limit is long.

Drawings

FIG. 1 is a schematic diagram of the system of the present invention;

FIG. 2 is a schematic diagram of the DTBAF reactor of the present invention;

in the figure: 1-a grating pool, 101-a domestic sewage inlet pipe, 2-a grit chamber, 3-a DTBT reactor, 301-a tank body, 302-an aeration system, 303-a water pump, 304-a lifting pipeline, 4-a DTBAF reactor, 401-a first reaction chamber, 402-a second reaction chamber, 403-a guide pipe, 404-a liquid dispersion guide plate, 405-a biological filter material layer, 406-a ceramsite filter material layer, 407-a liquid flushing coil, 408-a gas flushing coil, 409-a liquid discharge pipe, 410-a sewage discharge pipe, 5-a clean water tank, 6-a flushing pump and 7-an air blower.

Detailed Description

The present invention will be further explained with reference to the accompanying drawings:

as shown in figure 1, the rural domestic sewage biological treatment system comprises a grating tank 1, a grit chamber 2, a DTBT reactor 3, a DTBAF reactor 4 and a clean water tank 5 which are connected in sequence. The top of the grid pond 1 and the top of the grit chamber 2 are flush with the ground surface, the main body part of the grid pond and the grit chamber is embedded in the soil body, the DTBT reactor 3 is integrally embedded in the soil body, and the DTBAF reactor 4 and the clean water tank 5 are arranged on the ground surface to the top.

The domestic sewage inlet pipe 101 is connected with the grid tank 1, and the grit chamber 2 is connected with the grid tank 1 in an overflowing way; the grid tank 1 and the grit chamber 2 are used for removing large-volume and high-density impurities in domestic sewage. The middle part of the grit chamber 2 is communicated with the DTBT reactor 3 through a pre-buried pipeline.

The DTBT reactor 3 includes a tank 301, and the tank 301 has a horizontal cylindrical shape. Two openings are arranged at the top of the tank body 301, one opening is used for introducing air, and the other opening is used for leading out the water body after reaction. An aeration system 302 is arranged at the bottom in the tank body 301, an air pipe is connected to the aeration system 302, and the air pipe is led out from an opening at the top of the tank body 301 and is connected with a blower 7. The tank 301 is also provided with a water pump 303 and a lifting pipe 304, and the lifting pipe 304 is led out through another opening at the top of the tank 301 and is communicated with the DTBAF reactor 4.

As shown in fig. 2, the DTBAF reactor 4 includes a reactor shell, the inner cavity of the reactor shell is divided into a first reaction chamber 401 and a second reaction chamber 402 by a partition, the first reaction chamber 401 and the second reaction chamber 402 have substantially equal volumes, and the second reaction chamber 402 is overflow connected with the first reaction chamber 401. A guide pipe 403 which is vertically downward is arranged in the center of the first reaction chamber 401, the lower end of the guide pipe 403 extends to the lower part of the first reaction chamber 401, and the outlet of the lifting pipe 304 is connected with the top of the guide pipe 403. A conical liquid dispersion guide plate 404 is arranged right below the outlet of the guide pipe 403, the bottom of the liquid dispersion guide plate 404 is connected with a vertical connecting rod, and the bottom of the first reaction chamber 401 is conical. The bottom of the first reaction chamber 401 is provided with a drain outlet, a drain valve is connected to the drain outlet, and the drain outlet is communicated to the grit chamber 2 through a drain pipe 410.

A biological filter material layer 405, a ceramsite filter material layer 406 and a back washing system are sequentially arranged in the second reaction chamber 402 from top to bottom. The second reaction chamber 402 is provided with a treatment liquid outlet below the biological filter material layer 405, the treatment liquid outlet is connected with the clean water tank 5 through a liquid discharge pipe 409, the liquid discharge pipe 409 is provided with a liquid discharge valve, and the outlet of the liquid discharge pipe 409 is positioned between the bottom layer and the top layer of the biological filter material layer 405. The back flushing system is used for flushing impurities in the biological filter material layer 405 and the ceramsite filter material layer 406 and comprises a liquid flushing coil 407 and a gas flushing coil 408, wherein the liquid flushing coil 407 is connected with a liquid spray nozzle, and the gas flushing coil 408 is connected with a gas spray nozzle. The far end of the liquid flushing coil 407 is connected with a flushing pump 6, and a liquid inlet pipe of the flushing pump 6 is connected with a clean water tank 5; the gas washout coil 408 is distally connected to a blower 7, which blower 7 simultaneously supplies the gas washout tray and the aeration system 302.

The second reaction chamber 402 is provided with a backwash liquid outlet above the biological filter material layer 405, the backwash liquid outlet is provided with a valve, the height of the backwash liquid outlet is lower than the height of an overflow liquid inlet of the second reaction chamber 402, when backwashing is prevented, a water body in the second reaction chamber 402 flows back to the first reaction chamber 401, and the backwash liquid outlet is communicated to the grit chamber 2 through a sewage discharge pipe 410.

In order to improve the automation effect, the water pump 303, the flushing pump 6, the blower 7 and valves of the system are controlled by a PLC (programmable logic controller), so that the system can operate automatically.

The working principle of the utility model is as follows:

domestic sewage firstly enters the grid pond 1, large floating objects are separated, and grid slag is cleaned regularly. After the grating separation, the gravity flow enters the cyclone grit chamber 2, the water flow enters from the tangential direction of the grit chamber 2, the water flow speed and the gravity of silt are utilized to realize the rapid silt separation, and the influence on the subsequent biochemical process is reduced. After passing through the grit chamber 2, sewage automatically flows into a first-stage liquid level lifting type bioreactor (DTBT reactor 3), and the DTBT reactor 3 can realize anoxic and aerobic alternate operation in a mode of intermittent aeration of an air blower 7 and intermittent operation of a water pump 303, so that good denitrification and dephosphorization effects are realized. Through time control, the water pump 303 is lifted to the second-stage alternative liquid level type DTBAF reactor 4, a biological carrier is installed in the DTBAF reactor 4, the carrier is submerged in the water inlet process, the carrier is exposed in the air after water inlet is finished, oxygen in the air is absorbed, microorganisms grow, and after the carrier is submerged in the microbial metabolism process and oxygen resources are consumed, an anoxic environment is generated, so that anoxic-aerobic alternative operation conditions can be generated, a good nitrogen and phosphorus removal effect is realized, meanwhile, the fan aeration is not used, and an energy-saving operation effect is achieved.

After a certain period of reaction, the impurities in the bio-filter layer 405 and the ceramsite filter layer 406 need to be cleaned. During cleaning, a drain valve on a drain pipe 409 is closed, a washing pump 6 and an air blower 7 are started, the water body in the clean water tank 5 is input into a liquid washing coil 407 by the washing pump 6, compressed air is input into a gas washing coil 408 by the air blower 7, washing water gradually submerges a ceramsite filtering material layer 406 and a biological filtering material layer 405, the ceramsite filtering material layer 406 and the biological filtering material layer 405 are cleaned, and finally the water is discharged through a back washing liquid outlet.

Claims

1. A rural domestic sewage biological treatment system is characterized by comprising a pretreatment tank, a DTBT reactor (3), a DTBAF reactor (4) and a clean water tank (5) which are connected in sequence;

the pretreatment tank is connected with a domestic sewage inlet pipe (101), the pretreatment tank is used for removing large-volume and large-density impurities in the domestic sewage, and the middle part of the pretreatment tank is communicated with the DTBT reactor (3) through a pipeline;

the DTBT reactor (3) comprises a tank body (301), and an aeration system (302) is arranged at the bottom in the tank body (301); a water pump (303) and a lifting pipeline (304) are also arranged in the tank body (301), and the far end of the lifting pipeline (304) is communicated with the DTBAF reactor (4);

the DTBAF reactor (4) comprises a reactor shell, the inner cavity of the reactor shell is divided into a first reaction chamber (401) and a second reaction chamber (402), the second reaction chamber (402) is in overflow connection with the first reaction chamber (401), and the lifting pipeline (304) is connected with the first reaction chamber (401); a biological filter material layer (405), a ceramsite filter material layer (406) and a back washing system are sequentially arranged in the second reaction chamber (402) from top to bottom; a treatment liquid outlet is arranged at the position, below the biological filter material layer (405), of the second reaction chamber (402), the treatment liquid outlet is connected with the clean water tank (5) through a liquid discharge pipe (409), and a liquid discharge valve is arranged on the liquid discharge pipe (409); the back flushing system is used for flushing impurities in the biological filter material layer (405) and the ceramsite filter material layer (406), and a back flushing liquid outlet is formed in the position, above the biological filter material layer (405), of the second reaction chamber (402).

2. The biological rural domestic sewage treatment system according to claim 1, wherein the outlet height of the drain pipe (409) is between the bottom layer and the top layer of the biological filter material layer (405).

3. The rural domestic sewage biological treatment system according to claim 1, wherein the back flushing system comprises a liquid flushing coil (407) and a gas flushing coil (408), a liquid spray nozzle is connected to the liquid flushing coil (407), and a gas spray nozzle is connected to the gas flushing coil (408).

4. The biological treatment system for rural domestic sewage according to claim 3, wherein the distal end of the liquid flushing coil (407) is connected with a flushing pump (6), and a liquid inlet pipe of the flushing pump (6) is connected with a clean water tank (5); the far end of the gas flushing coil pipe (408) is connected with a blower (7).

5. The biological treatment system for rural domestic sewage according to claim 3, wherein the height of the backwash liquid outlet is lower than that of the overflow liquid inlet of the second reaction chamber (402), and the backwash liquid outlet is communicated to the pretreatment tank through a sewage discharge pipe (410).

6. The biological treatment system for rural domestic sewage according to claim 5, wherein a sewage draining outlet is arranged at the bottom of the first reaction chamber (401) and communicated to the pretreatment tank through a sewage draining pipe (410).

7. The rural domestic sewage biological treatment system according to claim 1, wherein the first reaction chamber (401) is provided with a vertical downward draft tube (403) in the center, and the lower end of the draft tube (403) extends to the lower part of the first reaction chamber (401); the outlet of the lifting pipeline (304) is connected with the top of the guide pipe (403), and a conical liquid dispersion guide plate (404) is arranged right below the outlet of the guide pipe (403).

8. The rural domestic sewage biological treatment system according to claim 7, wherein the bottom of the first reaction chamber (401) is tapered.

9. The biological treatment system for rural domestic sewage according to claim 1, wherein the pretreatment tank and the DTBT reactor (3) are both disposed below ground, and the DTBAF reactor (4) and the clean water tank (5) are disposed above ground.

10. The rural domestic sewage biological treatment system according to claim 1, wherein the pretreatment tank comprises a grid tank (1) and a grit chamber (2), and the grit chamber (2) is in overflow connection with the grid tank (1); the domestic sewage inlet pipe (101) is connected with the grid tank (1), and the middle part of the grit chamber (2) is communicated with the DTBT reactor (3) through a pipeline.