CN102701448B - Rural domestic sewage reutilization treatment device - Google Patents

Abstract

The invention discloses a rural domestic sewage resource treatment device, which comprises a methane pool, a grid pretreatment unit, a buried anaerobic pool, an aerobic biological filter tower and a subsurface artificial wetland. The methane produced by the biogas digester can be denitrified and sulfate reduced under anaerobic conditions. Using methane as a carbon source to strengthen anaerobic biochemical treatment, the temperature increase of methane can improve the treatment efficiency, and the reflux after the tower biofilter can improve Nitrogen removal rate. The invention can effectively remove organic matter and efficiently remove nitrogen and phosphorus, has small footprint, low operating cost, adapts measures to local conditions, and realizes waste resource utilization.

Description

A rural domestic sewage resource treatment device

technical field

The invention relates to the field of environmental engineering, in particular to a device for treating rural domestic sewage as a resource.

Background technique

In recent years, with the development of my country's rural areas and the rapid improvement of rural people's living standards, the discharge of rural domestic sewage has continued to increase, and rural domestic sewage has become another serious pollution source next to urban sewage. At the same time, due to the scattered and wide-ranging pollution sources in rural areas, the small amount of sewage, and limited by natural conditions, rural domestic sewage is scattered and difficult to collect. It is difficult to lay sewage collection pipes on a large scale, making rural domestic sewage not included Large-scale centralized sewage plants conduct centralized treatment, and the harmless treatment rate of rural domestic sewage is very low. We can only find more suitable sewage treatment methods and processes with high efficiency and low energy consumption according to local conditions.

At present, the commonly used processes for rural domestic sewage treatment mainly include biochemical treatment systems (anaerobic, anoxic, aerobic) and ecological treatment systems, mainly unpowered anaerobic biological treatment, land treatment, and constructed wetland processes. This series of methods has disadvantages such as long residence time, poor treatment effect in winter, and poor removal effect of nitrogen and phosphorus in wastewater. For example, the simple biochemical treatment system has high operating costs and is difficult to adapt to the economic conditions in rural areas, and the ecological treatment technology also has poor seasonal treatment effects in winter. Therefore, the lack of existing rural domestic sewage treatment technology and excessive nitrogen and phosphorus discharge are the direct causes of the increasingly serious eutrophication of rural domestic sewage.

In order to adapt to the characteristics of rural areas, the development direction of rural domestic sewage treatment is to strengthen the anaerobic biochemical treatment system, or to combine aeration and oxygenation with sewage lifting, mixed liquid return, etc., and make full use of the ecological treatment system to fully Reduce operating costs and reduce the difficulty of maintenance management. At the same time, the latest research shows that under anaerobic conditions, it is feasible to use methane as a carbon source for nitrate denitrification and sulfate reduction, and can maintain a high denitrification rate.

Contents of the invention

The purpose of the present invention is to overcome the existing deficiencies, solve the problems of poor rural domestic sewage treatment effect and high operating costs, and provide a rural domestic sewage resource treatment device with high efficiency, low consumption, high pollution control efficiency and good environmental benefits.

The present invention adopts the scheme of following technology for realizing above-mentioned purpose:

A rural domestic sewage resource treatment device, including a biogas digester, a gas storage tank, a gas pressure regulator, a gas circulation pump, a gas pipeline, a grid treatment unit, a buried anaerobic tank, a tower biofilter, and a subsurface artificial wetland , lifting pump, flow meter, return pump, sewage pipeline, water inlet pipe, aeration device, biological filler, wetland plants, water outlet pipe; between the biogas digester and the gas storage tank, between the gas storage tank and the air pressure regulator, The gas pressure regulator and the gas circulation pump are connected through gas pipelines; between the grid treatment unit and the buried anaerobic tank, between the buried anaerobic tank and the tower biofilter, and between the tower biofilter It is connected with the subsurface constructed wetland through sewage pipes; the water inlet pipe is set at the front end of the grid treatment unit; the aeration device is set at the bottom of the buried anaerobic pool, and the aeration device is connected with the gas The circulation pump is connected; the gas pipeline between the air pressure regulator and the gas circulation pump is provided with a gas branch pipe, and the gas branch pipe is connected with the buried anaerobic tank; the lift pump is located at the buried anaerobic tank and on the sewage pipeline between the tower biofilter; the flow meter is arranged on the sewage pipeline between the tower biofilter and the subsurface flow constructed wetland; on the sewage pipeline between the tower biofilter and the flow meter The sewage branch pipe is connected to the bottom of the buried anaerobic tank, and the return pump is arranged on the sewage branch pipe; the wetland plants are arranged on the subsurface flow artificial wetland, and the outlet pipe is arranged at the end of the subsurface flow artificial wetland.

The buried anaerobic tank is fully underground, adopts brick or concrete structure, and has a manhole for cleaning.

The methane in the gas storage tank is produced from a biogas digester. There are often biogas digesters in rural areas, and a part of the methane generated can be stored in the gas tank, and the flow is controlled by a pressure regulator when it is used;

The aeration gas of the aeration device is methane. The buried anaerobic tank uses an aeration device, a gas circulation pump and a gas pipeline to aerate by circulating methane.

The hydraulic retention time in the buried anaerobic tank is 20-30 hours, and the inoculum sludge comes from the anaerobic activated sludge of the local sewage treatment plant.

The grid processing unit is underground, and a fine grid is installed at the water inlet. The inclination angle of the fine grid is 40-60 degrees, and the gap between the grid bars is 20-40 mm.

The biological filler in the tower biofilter is a microporous biological filter material. In order to make the sewage contact with the microporous biological filter material and flow through the microporous biological filter material at a certain rate, while maintaining the purification effect, the bulk density is 600~1200g/cm3, the particle size of microporous biological filter material is 25~40 mm.

Compared with the prior art, the present invention has the following beneficial effects:

1. The device is equipped with biogas digesters, grid pretreatment units, buried anaerobic tanks, aerobic biological filter towers, and subsurface constructed wetlands, which can efficiently remove organic matter and nitrogen and phosphorus nutrients in rural domestic sewage.

2. The grille treatment unit and the buried anaerobic pool adopt the underground type, which is conducive to keeping warm in winter and reducing the impact of temperature.

3. The methane produced by the biogas digester can be denitrified and sulfate reduced under anaerobic conditions. Using methane as a carbon source to strengthen anaerobic biochemical treatment and maintain a high denitrification rate can be adapted to local conditions to realize waste resource utilization.

4. Because methane has a warming effect, it can simultaneously improve the treatment efficiency of the buried anaerobic tank and the tower biological filter, and the effect is remarkable.

5. The invention sets the reflux of the filtered mixed liquid, which can effectively improve the removal rate of COD, ammonia nitrogen and total nitrogen, and ensure the quality of effluent water and the stable operation of the system.

6. The device adopts automatic control, which is convenient for operation and management, and easy for maintenance. It only needs to arrange special personnel to regularly clean up the sundries at the grill outlet, and regularly check and maintain the water pump and control system.

Description of drawings

Fig. 1 is a schematic structural view of the rural domestic sewage recycling treatment device of the present invention.

In the figure: 1 is a biogas digester, 2 is a gas storage tank, 3 is a gas pressure regulator, 4 is a gas circulation pump, 5 is a gas pipeline, 6 is a grid processing unit, 7 is an underground anaerobic tank, and 8 is a tower type biological filter, 9 is subsurface constructed wetland, 10 is lift pump, 11 is flow meter, 12 is return pump, 13 is sewage pipe, 14 is water inlet pipe, 15 is aeration device, 16 is biological filler, 17 is wetland Plant, 18 are outlet pipes.

Detailed ways

Embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings.

Example 1

A rural domestic sewage resource treatment device, including a biogas digester 1, a gas storage tank 2, an air pressure regulator 3, a gas circulation pump 4, a gas pipeline 5, a grid treatment unit 6, an underground anaerobic tank 7, and a tower type Biological filter 8, submerged artificial wetland 9, lift pump 10, flow meter 11, return pump 12, sewage pipe 13, water inlet pipe 14, aeration device 15, biological filler 16, wetland plants 17, water outlet pipe 18; biogas digester 1 It is connected with the gas storage tank 2, between the gas storage tank 2 and the gas pressure regulator 3, and between the gas pressure regulator 3 and the gas circulation pump 4 through gas pipelines; the grid processing unit 6 and the buried anaerobic tank 7 between the buried anaerobic tank 7 and the tower biofilter 8, and between the tower biofilter 8 and the subsurface flow constructed wetland 9 are all connected by sewage pipes 13; The front end; the aeration device 15 is located at the bottom of the buried anaerobic tank 7, and the aeration device 15 is connected with the gas circulation pump 4 through the gas pipeline; on the gas pipeline between the air pressure regulator 3 and the gas circulation pump 4 A gas branch pipe is provided, and the gas branch pipe is connected to the buried anaerobic tank 7; the lift pump 10 is set on the sewage pipeline between the buried anaerobic tank 7 and the tower biofilter 8; the flow meter 11 is set on On the sewage pipeline between the tower biofilter 8 and the subsurface constructed wetland 9; on the sewage pipeline between the tower biofilter 8 and the flow meter 11, a sewage branch pipe is provided, and the sewage branch pipe is connected to the buried anaerobic pool 7 connected at the bottom, and the return pump 12 is set on the sewage branch pipe;

The buried anaerobic tank 7 is fully underground, adopts brick or concrete structure, and is provided with a manhole for cleaning.

The methane in the gas storage tank 2 is produced from the biogas digester 1, and the flow is controlled by the air pressure regulator 3;

The aeration gas of the aeration device 15 is methane. The buried anaerobic tank 7 utilizes the aeration device 15, the gas circulation pump 4 and the gas pipeline 5 to perform aeration by circulating methane.

The hydraulic retention time in the buried anaerobic tank 7 is 20-30 hours, and the inoculum sludge comes from the anaerobic activated sludge of the local sewage treatment plant.

The grid processing unit 6 is an underground type, and a fine grid is installed at the water inlet, the inclination angle of the fine grid is 40-60 degrees, and the gap between the grid bars is 20-40 mm.

The biological filler 16 in the tower biofilter 8 is a microporous biological filter material with a bulk density of 600-1200 g/cm3 and a particle size of 25-40 mm.

Example 2

A rural domestic sewage resource treatment device, including a biogas digester 1, a gas storage tank 2, an air pressure regulator 3, a gas circulation pump 4, a gas pipeline 5, a grid treatment unit 6, an underground anaerobic tank 7, and a tower type Biological filter 8, submerged artificial wetland 9, lift pump 10, flow meter 11, return pump 12, sewage pipe 13, water inlet pipe 14, aeration device 15, biological filler 16, wetland plants 17, water outlet pipe 18; biogas digester 1 It is connected with the gas storage tank 2, between the gas storage tank 2 and the gas pressure regulator 3, and between the gas pressure regulator 3 and the gas circulation pump 4 through gas pipelines; the grid processing unit 6 and the buried anaerobic tank 7 Between them, between the buried anaerobic tank 7 and the tower biofilter 8, between the tower biofilter 8 and the subsurface constructed wetland 9 are all connected by sewage pipes 13; Water pipe 14; aeration device 15 is located at the bottom in the buried anaerobic tank 7; and aeration device 15 is connected with gas circulation pump 4 through gas pipeline; A gas branch pipe is provided, and the gas branch pipe is connected to the buried anaerobic tank 7; the lifting pump 10 is arranged on the sewage pipeline between the buried anaerobic tank 7 and the tower biofilter 8; the tower biofilter A flowmeter 11 is provided on the sewage pipeline between 8 and the subsurface constructed wetland 9; a sewage branch pipe is provided on the sewage pipeline between the tower biofilter 8 and the flowmeter 11, and the sewage branch pipe is connected to the buried anaerobic pool 7 The bottom of the submerged flow constructed wetland 9 is connected to each other, and the sewage branch pipe is provided with a return pump 12; wetland plants 17 are arranged on the subsurface flow constructed wetland 9, and an outlet pipe 18 is provided at the end of the subsurface flow constructed wetland 9.

The buried anaerobic tank 7 is fully underground, adopts brick or concrete structure, and is provided with a manhole for cleaning.

The methane in the gas storage tank 2 is produced from the biogas digester 1, and the flow is controlled by the air pressure regulator 3;

The buried anaerobic tank 7 uses the aeration device 15, the gas circulation pump 4 and the gas pipeline 5 to aerate through the mode of circulating methane, and the hydraulic retention time is 24 hours. The inoculated sludge comes from the anaerobic active sewage of the local sewage treatment plant. mud.

The grid processing unit 6 is an underground type, and a fine grid is installed at its water inlet, the inclination angle of the fine grid is 60 degrees, and the gap between the grid bars is 40 mm.

The biological filler 16 in the tower biofilter 8 is a microporous biological filter material with a bulk density of 1000 g/cm ³ and a particle size of 40 mm.

This device is used for rural domestic sewage treatment. In actual work, when the concentration of CODcr in the rural domestic sewage is 350mg/L, the concentration of NH ₃ -N is 32mg/L, the concentration of TN is 59mg/L, and the concentration of TP is 3mg/L, the sewage to be treated will flow from the water inlet pipe (14 ) into the buried anaerobic tank (7) after being pretreated by the grid treatment unit (6), where organic matter in the water is decomposed and removed under the action of anaerobic bacteria, and at the same time, methane is used as a carbon source for denitrification and sulfate Reduction, aeration is carried out by circulating methane. The aeration rate of methane is 2L/h. After staying for 24 hours, the sewage enters the tower biofilter (8) through the lift pump (10) to further remove organic matter and nitrogen and phosphorus. The tower The filtered water of the type biological filter (8) is returned to the buried anaerobic tank (7) through the return pump (12), and the return ratio is 100%. Stop the backflow, let the effluent from the tower biofilter (8) enter the subsurface constructed wetland (9) for further phosphorus removal, and at the same time remove nitrogen to a certain extent. The wetland plant (17) is canna, and the subsurface constructed wetland (9) uses pebbles and blast furnaces Filled with slag, the sewage finally flows out from the outlet pipe (18) at the end of the subsurface constructed wetland (9). After being treated by this device, the concentration of CODcr in the effluent is 33mg/L, the removal rate is 90.6%, and the concentration of NH ₃ -N is 4mg/L. The removal rate is 87.5%, the TN concentration is 9mg/L, the removal rate is 84.7%, the TP concentration is 0.6mg/L, the removal rate is 80.0%, and the treated effluent meets the discharge standard.

Claims (6)

1. a domestic sewage in rural areas by using processing equipment for recycling comprises methane-generating pit (1), gas-holder (2), air pressure regulator (3), gas recycle pump (4), gas pipeline (5), grid processing unit (6), buried anaerobic pond (7), tower biological filter (8), drowned flow artificial wet land (9), lift pump (10), under meter (11), reflux pump (12), sewer line (13), water inlet pipe (14), aerating apparatus (15), biologic packing material (16), wetland plant (17), rising pipe (18); It is characterized in that: between described methane-generating pit (1) and the gas-holder (2), between gas-holder (2) and the air pressure regulator (3), all be connected by gas pipeline between air pressure regulator (3) and the gas recycle pump (4); Between described grid processing unit (6) and the buried anaerobic pond (7), between buried anaerobic pond (7) and tower biological filter (8), all connect by sewer line (13) between tower biological filter (8) and the drowned flow artificial wet land (9); Described water inlet pipe (14) is located at the front end of grid processing unit (6); Described aerating apparatus (15) is located at the bottom in the buried anaerobic pond (7), and aerating apparatus (15) is connected with gas recycle pump (4) by gas pipeline; Gas pipeline between described air pressure regulator (3) and the gas recycle pump (4) is provided with gas service pipe, and this gas service pipe links to each other with buried anaerobic pond (7); Described lift pump (10) is located on the sewer line between buried anaerobic pond (7) and tower biological filter (8); Described under meter (11) is located on the sewer line between tower biological filter (8) and the drowned flow artificial wet land (9); Sewer line between tower biological filter (8) and the under meter (11) is provided with branch sewer, and this branch sewer links to each other with the bottom of buried anaerobic pond (7), and reflux pump (12) is located on the branch sewer; Described wetland plant (17) is located on the drowned flow artificial wet land (9), and described rising pipe (18) is located at the tail end of drowned flow artificial wet land (9).

2. a kind of domestic sewage in rural areas by using processing equipment for recycling according to claim 1, it is characterized in that: described buried anaerobic pond (7) is full underground type, adopts brick or concrete structure, and is provided with the manhole for cleaning.

3. a kind of domestic sewage in rural areas by using processing equipment for recycling according to claim 1, it is characterized in that: the gas of described aerating apparatus (15) aeration is methane.

4. a kind of domestic sewage in rural areas by using processing equipment for recycling according to claim 1 is characterized in that: hydraulic detention time is 20 ~ 30 hours in the described buried anaerobic pond (7), and its seed sludge is from local sewage work anaerobic activated sludge.

5. a kind of domestic sewage in rural areas by using processing equipment for recycling according to claim 1, it is characterized in that: described grid processing unit (6) is underground type, and fine fack is installed in its water inlet place, and the fine fack angle of inclination is the 40-60 degree, and the grizzly bar gap is the 20-40 millimeter.

6. a kind of domestic sewage in rural areas by using processing equipment for recycling according to claim 1 is characterized in that: the biologic packing material (16) in described tower biological filter (8) is the micropore biofilter material, and tap density is 600 ~ 1200g/cm ³, the particle diameter of micropore biofilter material is 25 ~ 40 millimeters.

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