CN102757158A - Residence community domestic sewage treating system and method - Google Patents

Abstract

The invention relates to a domestic sewage treatment system in a residential quarter, comprising a black water collection system, an anaerobic acidification reaction tank, an anaerobic oxidation reaction tank and an aerobic contact oxidation tank. The lower part of the reaction tank is connected, the outlet of the anaerobic acidification reaction tank is connected with the inlet of the anaerobic oxidation reaction tank, the outlet of the anaerobic oxidation reaction tank is connected with the inlet of the aerobic contact oxidation tank, and the inlet of the aerobic contact oxidation tank is also connected with a brown Water collection system, the outlet of the aerobic contact oxidation tank is connected to the aerobic filter tower, the aerobic filter tower is equipped with a gray water collection system at the inlet, the anaerobic acidification reaction tank and the top of the anaerobic oxidation reaction tank are connected to a biogas collection tank, The biogas collection tank is connected to a gas boiler, and the gas boiler is connected to the anaerobic oxidation reaction pool through a pipeline, and the inlet of the anaerobic oxidation reaction pool is connected to an alkali solution addition system through a pipeline. The device of the invention is simple, has good sewage treatment effect, low engineering cost and occupies less land.

Description

Domestic sewage treatment system and method in residential quarters

technical field

The invention relates to the technical field of sewage treatment, in particular to a system and method for domestic sewage treatment in residential quarters.

Background technique

At present, the collection and treatment of sewage in most parts of our country adopts the centralized collection and treatment method, but the residential quarters built by remote industrial and mining enterprises far away from towns and cities, because they are far away from urban sewage treatment plants, the domestic sewage produced can only use septic tanks Such simple sewage treatment methods cannot meet the water reuse standard, which not only pollutes the environment, but also causes waste in areas where water resources are scarce.

Domestic sewage is divided into three categories according to its source and characteristics: ① black water, including fecal sewage from toilets or toilets; ② brown water, mainly kitchen wastewater; ③ gray water, including laundry, bathing wastewater, toilet wastewater and cleaning wastewater wait. Black water only accounts for a small part of domestic sewage. Black water is mixed with other domestic sewage for treatment, which not only increases the difficulty and cost of treatment, but also lowers the water quality after treatment. The domestic sewage separation treatment method adopts corresponding high-efficiency treatment methods for different water quality and water volume, so that the overall water treatment efficiency is greatly improved, so the corresponding investment cost and operating cost are much lower than traditional water treatment. The premise of domestic sewage separation and treatment is source separation and classified collection. At present, most of the residential buildings under construction in my country use two vertical sewage discharge pipes, one in the kitchen and one in the bathroom. In the future residential design, only Adding a discharge vertical pipe in the bathroom to collect gray water such as laundry and bathing can realize source separation and classified collection, and the initial investment increase is not much.

The Chinese patent "Separate Treatment System for Domestic Sewage" (application number: 200710120777.1) discloses a system device for the separation and treatment of domestic sewage, which has the advantages of compact structure and flexible installation. However, the patented device has the following defects: ①The process is long and there are many treatment facilities; ②The management and operation are complicated; ③There are many sewage pumps and the operating cost is high; ④The quality of domestic sewage is not fine.

Contents of the invention

The technical problem to be solved by the present invention is: in order to solve the technical problems of long domestic sewage treatment process, many equipments and high operating costs in the prior art, a domestic sewage treatment system and method in residential quarters can be provided, which can enter water in stages and carry out Sub-quality processing greatly shortens the process and improves processing efficiency.

The technical solution adopted by the present invention to solve the technical problem is: a domestic sewage treatment system in a residential area, including a black water collection system, an anaerobic acidification reaction tank, an anaerobic oxidation reaction tank and an aerobic contact oxidation tank, the black water The water collection system communicates with the lower part of the anaerobic acidification reaction tank through the black water inlet pipe, the outlet of the anaerobic acidification reaction tank communicates with the inlet of the anaerobic oxidation reaction tank, and the outlet of the anaerobic oxidation reaction tank communicates with the aerobic contact The inlet of the oxidation tank, the inlet of the aerobic contact oxidation tank is also connected with a brown water collection system, the outlet of the aerobic contact oxidation tank is connected with an aerobic filter tower, and the inlet of the aerobic filter tower is provided with a gray water collection system system, the top of the anaerobic acidification reaction pool and the anaerobic oxidation reaction pool are connected with a biogas collection tank, the biogas collection tank is connected with a gas boiler for heating the anaerobic oxidation reaction pool, and the gas boiler is connected to the anaerobic oxidation reaction pool through pipelines. In the oxygen oxidation reaction pool, the inlet of the anaerobic oxidation reaction pool is connected with an alkali solution addition system through a pipeline.

Further, a first three-phase separator is installed on the inner wall at the outlet of the anaerobic acidification reaction tank, and a first baffle is arranged in the anaerobic oxidation reaction tank, and the first baffle is higher than the anaerobic oxidation reaction tank. The pool mouth of the pool, the first baffle plate and the inner wall of the anaerobic oxidation reaction pool form an inlet pipeline for communicating with the anaerobic acidification reaction pool, the lower part of the anaerobic oxidation reaction pool is equipped with a heat exchanger, and the upper part is equipped with An acid-base online measuring device and a temperature online measuring device, the lye adding system controls the acid-base online measuring device, the gas boiler is provided with a control system for adjusting the amount of gas, the control system controls the temperature online measuring device, the gas boiler The heat exchanger is connected, and a second three-phase separator is installed on the inner wall at the outlet of the anaerobic oxidation reaction tank. The aerobic contact oxidation tank is provided with a second baffle, and the second baffle is higher than the aerobic contact oxidation tank. The pool mouth, the second baffle plate and the inner wall of the aerobic contact oxidation tank form an inlet pipeline for communicating with the anaerobic oxidation reaction tank, and the outlet of the inlet pipeline of the aerobic contact oxidation tank is provided with a third three-phase Separator, the middle part of the aerobic contact oxidation tank is arranged with filler, and the bottom of the aerobic contact oxidation tank is equipped with an aeration control system, and the aeration control system includes an aeration pan, an aeration pipe, a blower, a dissolved oxygen measuring device and Regulating device, the aeration pan is arranged in the bottom of the aerobic contact oxidation tank, the blower is arranged outside the aerobic contact oxidation tank and connected to the aeration pan through an aeration pipe, the dissolved oxygen measuring device is arranged under the water surface, The upper part of the aerobic contact oxidation tank, the control device regulates the work of the blower according to the data of the dissolved oxygen measuring device, and the fourth three-phase separator is installed on the inner wall of the outlet of the aerobic contact oxidation tank, and the fourth The outlet of the three-phase separator is connected with an overflow weir, and the aerobic filter tower is provided with a water distributor, a filter material and a filter material support frame, and the filter material and the filter material support frame form a filter material layer, and the water distributor The filter is set on the upper part of the aerobic filter tower, and a multi-layer filter material layer is set under the water distributor. Below the filter material layer is a sump. Water tank, the outlet pipe of the sump is connected with a clear water tank, and sludge discharge pipes are installed at the bottom of the anaerobic acidification reaction tank, anaerobic oxidation reaction tank and aerobic contact oxidation tank.

Further, the particle size of the filter material in each filter material layer gradually decreases from top to bottom in the aerobic filter tower. The particle size of the upper filter material layer is large, the gap is large, and the filtering effect is poor, and the particle size of the lower filter material layer is small, and the effect is good, ensuring that the water quality is getting better and better.

On the one hand, in order to enhance ventilation and avoid odor, on the other hand, for the convenience of observation and replacement of the filter material, the cross-section of the filter material support frame is an inverted trapezoidal shape, and each layer of filter material layer is embedded in the aerobic filter tower . When this layer of filter material is seriously clogged and the filtration rate is very low, it is only necessary to pull out the filter material layer for replacement.

In order to maximize resource utilization, the water outlet of the clear water pool is connected with a reuse water tie.

In order to sterilize the filtered water for subsequent use, disinfection equipment is also installed on the upper part of the sump.

In order to make the black water evenly distributed in the anaerobic acidification reaction tank after entering, the mouth of the black water inlet pipe in the anaerobic acidification reaction tank is set upwards, and above the mouth of the black water inlet pipe is also provided with a fixed anaerobic acidification reaction tank. The conical water distribution baffle on the inner wall of the pool, the tip of the water distribution baffle is set downward.

In order to provide more heat for the heat exchanger, the gas boiler is also connected with a natural gas pipeline.

In order to achieve efficient nitrogen and phosphorus removal, a sludge return pipe is installed at the bottom of the aerobic contact oxidation tank, and the sludge return pipe is connected to the anaerobic acidification reaction tank.

A sewage treatment method using a domestic sewage treatment system in a residential area has the following steps:

a. Collect black water, brown water and gray water in different collection systems;

b. Black water anaerobic acidification treatment: pass the black water into the anaerobic acidification reaction tank for treatment, and use the first three-phase separator to separate sludge and sewage to obtain organic acids and a small amount of gas;

c. Anaerobic oxidation treatment of black water: control the temperature in the anaerobic oxidation reaction tank, monitor the temperature in the anaerobic oxidation reaction tank through an online temperature measurement device, and the control system controls the temperature of the gas-fired boiler by regulating the amount of gas to make anaerobic oxidation The water temperature in the reaction tank is kept within the range of 35°C to 38°C, the pH value in the anaerobic oxidation reaction tank is controlled, the acidified sewage is passed into the anaerobic oxidation reaction tank, and lye is added in the anaerobic oxidation reaction tank , the PH value in the anaerobic oxidation reaction tank is adjusted through the lye addition system and the acid-base online measuring device, so that the PH value is controlled at 6.8-7.2, and methane gas is obtained after organic acid treatment;

d: gas collection: the gas in step b and step c is collected in the biogas collection tank for fuel gas;

e. Brown water aerobic treatment: the brown water in the brown water collection system and the anaerobic treated sewage are mixed and aerated in the aerobic contact oxidation tank, and the aeration volume of the aeration control system needs to be maintained in the aerobic contact oxidation tank The dissolved oxygen in water should not be lower than 2mg/L.

f. Gray water treatment: mix the gray water in the gray water collection system with the sewage after aerobic treatment, and then enter the aerobic filter tower for filtration to obtain clean water;

g, the clear water obtained by filtering in step f is pumped into the clear water pool from the sump by the water pump, and the water outlet of the clear water pool is connected to the water return tie for other purposes;

h. Sludge reflux and discharge: the excess sludge in the anaerobic acidification reaction tank, anaerobic oxidation reaction tank and aerobic contact oxidation tank is discharged through the sludge discharge pipe, and part of the sludge in the aerobic contact oxidation tank passes through The sludge return pipe returns to the anaerobic acidification reaction tank.

Further, the lye in the step c is lime water or sodium hydroxide solution.

The beneficial effect of the present invention is that the present invention adopts black water, brown water, and gray water to be classified and collected, and the water is fed in stages for separate treatment, which reduces the volume of the anaerobic reaction tank, reduces the engineering cost, and reduces the land occupation . At the same time, the acidification and gasification process is carried out in stages to ensure that the temperature and pH value of the gasification stage are under the optimal conditions for the growth of methane bacteria, so that the gasification stage is greatly shortened, the volume of the anaerobic reaction tank is further reduced, and the project cost is reduced. The invention has less sewage lifting, the sewage treatment unit relies on gravity self-flow, the operating cost is very low, the system device structure is simple, the installation and operation are convenient, it solves the pollution problem of domestic sewage in residential quarters built by remote industrial and mining enterprises far away from towns, and at the same time realizes Sewage reuse saves tap water for irrigation of green land, flowers and trees.

Description of drawings

The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

Fig. 1 is the flow chart of residential area domestic sewage treatment system of the present invention;

Fig. 2 is a structural schematic diagram of the domestic sewage treatment system in residential quarters of the present invention.

In the figure: 1. Black water collection system, 1-1. Black water inlet pipe, 2. Anaerobic acidification reaction tank, 2-1. First three-phase separator, 2-2. Water distribution baffle, 3. Anaerobic Oxygenation reaction tank, 3-1. First baffle, 3-2. Heat exchanger, 3-3. Acid-base online measuring device, 3-4. Temperature online measuring device, 3-5. Second three-phase Separator, 4. Aerobic contact reaction tank, 4-1. Second baffle, 4-2. Third three-phase separator, 4-3. Packing, 4-4. Aeration disc, 4-5. Aeration Air pipe, 4-6. Blower, 4-7. Dissolved oxygen measuring device, 4-8. Control device, 4-9. Fourth three-phase separator, 5. Brown water collection system, 6. Aerobic filter tower, 6-1. Water distributor, 6-2. Filter material, 6-3. Filter material support frame, 6-4. Filter material layer, 6-5. Water collection tank, 7. Gray water collection system, 8. Biogas collection Tank, 9. Alkali addition system, 10. Overflow weir, 11. Sludge discharge pipe, 12. Sludge return pipe, dotted arrows indicate sludge discharge, dotted arrows indicate sludge return.

Detailed ways

The present invention is described in further detail now in conjunction with accompanying drawing. These drawings are all simplified schematic diagrams, which only illustrate the basic structure of the present invention in a schematic manner, so they only show the configurations related to the present invention.

Example

As shown in Figure 1 and Figure 2, the present invention includes a black water collection system 1, anaerobic acidification reaction tank 2, anaerobic oxidation reaction tank 3 and aerobic contact oxidation tank 4, and black water collection system 1 passes through black water inlet pipe 1 -1 communicates with the lower part of the anaerobic acidification reaction tank 2, the outlet of the anaerobic acidification reaction tank 2 communicates with the inlet of the anaerobic oxidation reaction tank 3, and the outlet of the anaerobic oxidation reaction tank 3 communicates with the inlet of the aerobic contact oxidation tank 4, good The inlet of the oxygen contact oxidation tank 4 is also connected to a brown water collection system 5, the outlet of the aerobic contact oxidation tank 4 is connected to an aerobic filter tower 6, and the inlet of the aerobic filter tower 6 is provided with a gray water collection system 7 for anaerobic acidification The top of the reaction pool 2 and the anaerobic oxidation reaction pool 3 is connected with a biogas collection tank 8, and the biogas collection tank 8 is connected with a gas boiler for heating the anaerobic oxidation reaction pool 3, and the gas boiler is connected to the anaerobic oxidation reaction pool 3 through a pipeline. In the chemical reaction pool 3, the gas boiler is also connected with a natural gas pipeline, and the inlet of the anaerobic oxidation reaction pool 3 is connected with an alkali solution addition system 9 through a pipeline, and the black water inlet pipe 1-1 in the anaerobic acidification reaction pool 2 The mouth is set upwards, and the top of the mouth of the black water inlet pipe 1-1 is also provided with a conical water distribution baffle 2-2 fixed on the inner wall of the anaerobic acidification reaction tank 2, and the tip of the water distribution baffle 2-2 faces Next settings. The influent is evenly distributed in the anaerobic acidification reaction tank 2, and the organic matters in the sewage are converted into organic acids in the acidification tank.

A first three-phase separator 2-1 is installed on the inner wall at the outlet of the anaerobic acidification reaction tank 2, and a first baffle 3-1 is arranged in the anaerobic acidification reaction tank 3, and the first baffle 3-1 is higher than The pool mouth of the anaerobic oxidation reaction pool 3, the first baffle plate 3-1 and the inner wall of the anaerobic oxidation reaction pool 3 form an inlet pipeline for communicating with the anaerobic acidification reaction pool 2, and the lower part of the anaerobic oxidation reaction pool 3 A heat exchanger 3-2 is installed, an acid-base online measuring device 3-3 and a temperature online measuring device 3-4 are installed on the upper part, the lye adding system 9 controls the acid-base online measuring device 3-3, and the gas boiler is provided with an adjustment Gas volume control system, the control system controls the temperature online measuring device 3-4, the gas boiler is connected to the heat exchanger 3-2, and the second three-phase separator 3-5 is installed on the inner wall of the outlet of the anaerobic oxidation reaction tank 3 , the aerobic contact oxidation tank 4 is provided with a second baffle 4-1, the second baffle 4-1 is higher than the pool mouth of the aerobic contact oxidation tank 4, the second baffle 4-1 is connected to the aerobic contact oxidation tank 4 The inner wall forms the inlet pipeline for communicating with the anaerobic oxidation reaction tank 3, the third three-phase separator 4-2 is arranged at the outlet of the inlet pipeline of the aerobic contact oxidation tank 4, and the middle part of the aerobic contact oxidation tank 4 is arranged with Filler 4-3, an aeration control system is installed at the bottom of the aerobic contact oxidation tank 4, the aeration control system includes aeration pan 4-4, aeration pipe 4-5, blower 4-6, dissolved oxygen measuring device 4- 7 and the control device 4-8, the aeration pan 4-4 is arranged in the bottom of the aerobic contact oxidation tank 4, the air blower 4-6 is set outside the aerobic contact oxidation tank 4 and connected to the aeration pan through the aeration pipe 4-5 4-4, the dissolved oxygen measuring device 4-7 is located under the water surface, on the upper part of the aerobic contact oxidation tank 4, and the regulating device 4-8 regulates the work of the blower 4-6 according to the data of the dissolved oxygen measuring device 4-7, and the aerobic A fourth three-phase separator 4-9 is installed on the inner wall of the outlet of the contact oxidation tank 4, and the outlet of the fourth three-phase separator 4-9 is connected with an overflow weir 10, and the aerobic filter tower 6 is provided with a water distributor 6-1, filter material 6-2 and filter material support frame 6-3, filter material 6-2 and filter material support frame 6-3 form filter material layer 6-4, filter material support frame 6-3 section is inverted Trapezoidal shape, each filter material layer 6-4 is embedded and inserted in the aerobic filter tower 6, the water distributor 6-1 is set on the upper part of the aerobic filter tower 6, and multi-layer filter materials are arranged under the water distributor 6-1 Layer 6-4, the particle size of the filter material 6-2 in each layer of filter material layer 6-4 gradually decreases from top to bottom in the aerobic filter tower 6, and the bottom of the filter material layer 6-4 is a water collection tank 6-5 , the outlet of the overflow weir 10 is connected to the water distributor 6-1 through the pipeline and the outlet pipe of the gray water collection system 7, the outlet pipe of the sump 6-5 is connected with a clear water pool, and the outlet of the clear water pool is connected with a reuse water plug.

A sludge discharge pipe 11 is installed at the bottom of the anaerobic acidification reaction tank 2, anaerobic oxidation reaction tank 3 and aerobic contact oxidation tank 4, and a sludge return pipe 12 is also installed at the bottom of the aerobic contact oxidation tank 4, and the sludge The return pipe 12 is connected to the anaerobic acidification reaction tank 2 . In this way, it can be used to discharge excess sludge and sludge backflow. When the reuse water is only used for watering lawns, flowers and trees, etc., no sludge return pipe is required. The treated sewage retains some nutrients such as nitrogen and phosphorus; When the water quality requirements are high, a sludge return pipe is set to return the sludge from the aerobic contact oxidation tank 4 to the anaerobic acidification reaction tank 2, so as to achieve efficient nitrogen and phosphorus removal and improve the water quality of the reused water.

A method of utilizing sewage treatment has the following steps:

a. Collect black water, brown water and gray water in different collection systems;

b. Black water anaerobic acidification treatment: pass the black water into the anaerobic acidification reaction tank 2 for treatment, and use the first three-phase separator 2-1 to separate sludge and sewage to obtain organic acids and a small amount of gas;

c. Anaerobic oxidation treatment of black water: control the temperature in the anaerobic oxidation reaction pool 3, monitor the temperature in the anaerobic oxidation reaction pool 2 through the temperature online measuring device 3-4, and the control system controls the gas boiler by regulating the amount of gas Temperature, keep the water temperature in the anaerobic oxidation reaction tank 3 within the range of 35 ° C ~ 38 ° C, control the pH value in the anaerobic oxidation reaction tank 3, and pass the acidified sewage into the anaerobic oxidation reaction tank 3. Add lye to the anaerobic oxidation reaction pool 3, adjust the pH value in the anaerobic oxidation reaction pool 3 through the lye addition system 9 and the acid-base online measuring device 3-3, so that the pH value is controlled at 6.8 to 7.2 , methane gas is obtained after organic acid treatment;

d: gas collection: the gas in step b and step c is collected in the biogas collection tank 8 for fuel gas;

e. Brown water aerobic treatment: the brown water in the brown water collection system 5 and the anaerobic treated sewage are mixed and aerated in the aerobic contact oxidation tank 4, and the aeration volume of the aeration control system needs to maintain aerobic contact The dissolved oxygen in the water in the oxidation pond 4 is not less than 2mg/L.

f, gray water treatment: the gray water in the gray water collection system 7 is mixed with the sewage after aerobic treatment, and then enters the aerobic filter tower 6 for filtration to obtain clear water;

g, the clear water obtained by filtering in the step f is pumped into the clear water pool from the sump 6-5 by the water pump, and the water outlet of the clear water pool is connected to the water return tie for other purposes;

h. Sludge backflow and discharge: the excess sludge in the anaerobic acidification reaction tank 2, anaerobic oxidation reaction tank 3 and aerobic contact oxidation tank 4 is discharged through the sludge discharge pipe 11, and the aerobic contact oxidation tank 4 The middle part of the sludge is returned to the anaerobic acidification reaction tank 2 through the sludge return pipe 12 .

The organic acid is converted into methane and other gases in the anaerobic oxidation reaction tank 3, and the best living conditions of the methane bacteria are a temperature of 35° C. to 38° C. and a pH value of 6.8 to 7.2. The anaerobic oxidation reaction tank 3 is provided with a heat exchanger 3-2, an online temperature measuring device 3-4 and an online pH measuring device 3-3, and is connected to an external control system. The heat for temperature control comes from the gas boiler. The gas comes from the methane gas produced by gasification and the external natural gas. The heat exchanger 3-2 is filled with water and pumped for water circulation. The temperature of the gas boiler is controlled by regulating the amount of gas. The gas boiler is connected to The heat exchanger 3-2 arranged in the anaerobic oxidation reaction tank 3 keeps the water temperature in the anaerobic oxidation reaction tank 3 within the range of 35°C to 38°C. The PH value of the sewage from the anaerobic acidification reaction tank 2 is low, and lye is added at the entrance of the gasification tank to control the PH value within the range of 6.8 to 7.2. The lye is lime water or sodium hydroxide solution, and anaerobic The volume of the acidification reaction tank 3 is determined according to the hydraulic retention time and the volume of the acidification tank.

The mixed black water and brown water at the entrance of the aerobic contact oxidation tank 4 enter the aerobic contact oxidation tank 4 along the third three-phase separator 4-2 middle gap at the bottom of the aerobic contact oxidation tank 4 entrance, and set the first The purpose of the three-phase separator 4-2 is to prevent the air sprayed by the aeration pan 4-4 arranged at the bottom from mixing into the water inlet to form a reverse flow. The amount of aeration needs to keep the dissolved oxygen in the water in the aerobic contact oxidation tank 4 not lower than 2mg/L. The volume of the aerobic contact oxidation tank 4 is determined according to the volume of the anaerobic acidification reaction tank 2, the brown water volume and the hydraulic retention time.

The sewage after aerobic treatment enters the water distributor 6-1 at the upper part of the multi-layer aerobic filter tower 6 through the overflow weir 10 and the gray water inlet pipe under the action of the fourth three-phase separator 4-9. The aerobic filter tower 6-1 adopts multi-layer arrangement, and the particle size of the filter material 6-2 becomes smaller gradually from top to bottom. The filter material support frame 6-3 of each filter tower layer 6-4 is designed as an inverted trapezoidal drawer type. On the one hand, it strengthens ventilation and avoids odor. On the other hand, it is convenient to observe and replace the filter material. , when filtration rate is very low, only need this layer filter material layer 6-4 is extracted out to replace and get final product, the bottom of aerobic filter tower 6 is provided with air inlet, sump 6-5 and outlet pipe. In order to sterilize the filtered water to meet subsequent use, a disinfection device is also installed on the upper part of the sump 6-5 for disinfection.

The present invention adopts black water, brown water and gray water to be classified and collected, and the water is fed in stages to carry out quality separation treatment, thereby reducing the volume of the anaerobic reaction tank, reducing the engineering cost and occupying an area. At the same time, the acidification and gasification process is carried out in stages to ensure that the temperature and pH value of the gasification stage are under the optimal conditions for the growth of methane bacteria, so that the gasification stage is greatly shortened, the volume of the anaerobic reaction tank is further reduced, and the project cost is reduced. The invention has less sewage lifting, the sewage treatment unit relies on gravity self-flow, the operating cost is very low, the system device structure is simple, the installation and operation are convenient, it solves the pollution problem of domestic sewage in residential quarters built by remote industrial and mining enterprises far away from towns, and at the same time realizes Sewage reuse saves tap water for irrigation of green land, flowers and trees.

Inspired by the above-mentioned ideal embodiment according to the present invention, through the above-mentioned description content, relevant workers can make various changes and modifications within the scope of not departing from the technical idea of the present invention. The technical scope of the present invention is not limited to the content in the specification, but must be determined according to the scope of the claims.

Claims (11)

1. A domestic sewage treatment system in a residential area, characterized in that: it includes a black water collection system (1), an anaerobic acidification reaction tank (2), an anaerobic oxidation reaction tank (3) and an aerobic contact oxidation tank (4 ), the black water collection system (1) communicates with the lower part of the anaerobic acidification reaction tank (2) through the black water inlet pipe (1-1), and the outlet of the anaerobic acidification reaction tank (2) is connected to the anaerobic oxidation reaction tank (2) The inlet of the reaction tank (3) is connected, the outlet of the anaerobic oxidation reaction tank (3) is connected to the inlet of the aerobic contact oxidation tank (4), and the inlet of the aerobic contact oxidation tank (4) is also connected to the brown water collection system (5), the outlet of the aerobic contact oxidation tank (4) is connected with an aerobic filter tower (6), and the inlet of the aerobic filter tower (6) is provided with a gray water collection system (7), the The top of the anaerobic acidification reaction tank (2) and the anaerobic oxidation reaction tank (3) is connected with a biogas collection tank (8), and the biogas collection tank (8) is connected with a heat supply for the anaerobic oxidation reaction tank (3). A gas-fired boiler, the gas-fired boiler is connected to the anaerobic oxidation reaction pool (3) through a pipeline, and the inlet of the anaerobic oxidation reaction pool (3) is connected to an alkali solution addition system (9) through a pipeline. 2. The domestic sewage treatment system in residential quarters according to claim 1, characterized in that: a first three-phase separator (2-1) is installed on the inner wall at the outlet of the anaerobic acidification reaction tank (2), and the The anaerobic oxidation reaction tank (3) is provided with a first baffle (3-1), the first baffle (3-1) is higher than the pool mouth of the anaerobic oxidation reaction tank (3), and the first The baffle (3-1) and the inner wall of the anaerobic oxidation reaction tank (3) form an inlet pipeline for connecting the anaerobic acidification reaction tank (2), and the lower part of the anaerobic oxidation reaction tank (3) is installed with The heat exchanger (3-2), the upper part is equipped with an acid-base online measuring device (3-3) and a temperature online measuring device (3-4), and the lye adding system (9) controls the acid-base online measuring device (3 -3), the gas boiler is equipped with a control system for adjusting the amount of gas, the control system controls the temperature online measurement device (3-4), the gas boiler is connected to the heat exchanger (3-2), and the anaerobic oxidation reaction A second three-phase separator (3-5) is installed on the inner wall of the outlet of the tank (3), and a second baffle (4-1) is installed in the aerobic contact oxidation tank (4), and the second baffle (4-1) is higher than the pool mouth of the aerobic contact oxidation tank (4), and the second baffle (4-1) is formed with the inner wall of the aerobic contact oxidation tank (4) to communicate with the anaerobic oxidation reaction tank ( 3), the inlet pipeline of the aerobic contact oxidation tank (4) is provided with a third three-phase separator (4-2) at the outlet of the inlet pipeline, and the middle part of the aerobic contact oxidation tank (4) is arranged with Filler (4-3), an aeration control system is installed at the inner bottom of the aerobic contact oxidation tank (4), and the aeration control system includes an aeration pan (4-4), an aeration pipe (4-5), a blower (4-6), dissolved oxygen measuring device (4-7) and control device (4-8), the aeration pan (4-4) is arranged in the bottom of the aerobic contact oxidation tank (4), and the blower (4-6) is set outside the aerobic contact oxidation tank (4) and connected to the aeration pan (4-4) through the aeration pipe (4-5), and the dissolved oxygen measuring device (4-7) is set on the water surface Bottom, the upper part of the aerobic contact oxidation tank (4), the control device (4-8) regulates the work of the blower (4-6) according to the data of the dissolved oxygen measurement device (4-7), and the aerobic contact oxidation A fourth three-phase separator (4-9) is installed on the inner wall of the outlet of the pool (4), and the outlet of the fourth three-phase separator (4-9) is connected with an overflow weir (10). The oxygen filter tower (6) is equipped with a water distributor (6-1), a filter material (6-2) and a filter material support frame (6-3), and the filter material (6-2) and filter material support frame (6-3) Form a filter material layer (6-4), the water distributor (6-1) is set on the upper part of the aerobic filter tower (6), and multi-layer filter material is set under the water distributor (6-1) Layer (6-4), under the filter material layer (6-4) is the sump (6-5), the outlet of the overflow weir (10) is connected with the outlet pipe of the gray water collection system (7) through the pipeline It is connected to the water distributor (6-1), and the outlet pipe of the sump (6-5) is connected to a clear water pool A sludge discharge pipe (11) is installed at the bottom of the anaerobic acidification reaction tank (2), anaerobic oxidation reaction tank (3) and aerobic contact oxidation tank (4). 3. The domestic sewage treatment system in residential quarters according to claim 2, characterized in that: the particle size of the filter material (6-2) in each layer of filter material layer (6-4) is less than that of the aerobic filter tower (6 ) gradually decreases from top to bottom. 4. The domestic sewage treatment system in residential quarters as claimed in claim 2, characterized in that: the cross-section of the filter material support frame (6-3) is an inverted trapezoidal shape, and each layer of filter material layer (6-4) is embedded Type inserted in the aerobic filter tower (6). 5. The domestic sewage treatment system in residential quarters as claimed in claim 2, characterized in that: the water outlet of the clean water pool is connected with a reuse water hook. 6. The domestic sewage treatment system in residential quarters according to claim 2, characterized in that: the upper part of the sump (6-5) is also equipped with disinfection equipment. 7. The domestic sewage treatment system in residential quarters according to claim 1 or 2, characterized in that: the mouth of the black water inlet pipe (1-1) in the anaerobic acidification reaction tank (2) is set upward, and the There is also a conical water distribution baffle (2-2) fixed on the inner wall of the anaerobic acidification reaction tank (2) above the mouth of the black water inlet pipe (1-1). The water distribution baffle (2-2) set with the tip facing down. 8. The domestic sewage treatment system in residential quarters according to claim 1 or 2, characterized in that: the gas boiler is also connected with a natural gas pipeline. 9. The domestic sewage treatment system of residential quarters according to claim 1 or 2, characterized in that: a sludge return pipe (12) is installed at the bottom of the aerobic contact oxidation tank (4), and the sludge returns The pipe (12) is connected to the anaerobic acidification reaction tank (2). 10. A sewage treatment method utilizing the residential quarter domestic sewage treatment system described in any one of claims 1 to 9, characterized in that it has the following steps: a. Collect black water, brown water and gray water in different collection systems; b. Black water anaerobic acidification treatment: pass the black water into the anaerobic acidification reaction tank (2) for treatment, and use the first three-phase separator (2-1) to separate sludge and sewage to obtain organic acids and a small amount of gas; c. Anaerobic oxidation treatment of black water: control the temperature in the anaerobic oxidation reaction tank (3), monitor the temperature in the anaerobic oxidation reaction tank (2) through the temperature online measuring device (3-4), and control the temperature of the anaerobic oxidation reaction tank (2) through the control system The gas volume is used to control the temperature of the gas-fired boiler, so that the water temperature in the anaerobic oxidation reaction pool (3) is kept within the range of 35°C to 38°C, and the pH value in the anaerobic oxidation reaction pool (3) is controlled, and the acidification treatment The sewage is passed into the anaerobic oxidation reaction pool (3), and lye is added in the anaerobic oxidation reaction pool (3), and the anaerobic acid is adjusted through the lye addition system (9) and the acid-base online measuring device (3-3). The pH value in the oxygen oxidation reaction tank (3) is controlled at 6.8 to 7.2, and methane gas is obtained after organic acid treatment; d: gas collection: the gas in step b and step c is collected in the biogas collection tank (8) for gas use; e. Brown water aerobic treatment: mix and aerate the brown water in the brown water collection system (5) and the anaerobically treated sewage in the aerobic contact oxidation tank (4), and the aeration volume of the aeration control system needs to be Keep the dissolved oxygen in the water in the aerobic contact oxidation tank (4) not lower than 2mg/L. f. Gray water treatment: mix the gray water in the gray water collection system (7) with the sewage after aerobic treatment, and then enter the aerobic filter tower (6) for filtration to obtain clean water; g. Pump the clear water filtered in step f into the clear water pool from the sump (6-5) by the water pump, and connect the water outlet of the clear water pool to the water return tie for other purposes; h. Sludge return and discharge: Pass the excess sludge in the anaerobic acidification reaction tank (2), anaerobic oxidation reaction tank (3) and aerobic contact oxidation tank (4) through the sludge discharge pipe (11) discharge, part of the sludge in the aerobic contact oxidation tank (4) is returned to the anaerobic acidification reaction tank (2) through the sludge return pipe (12). 11. The sewage treatment method according to claim 10, characterized in that: the lye in the step c is lime water or sodium hydroxide solution.

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