CN211644786U - Biochemical wetland ecological purification system for new rural domestic sewage - Google Patents

Abstract

The utility model relates to a new rural domestic sewage biochemical wetland ecological purification system, which comprises a regulating tank, a hydrolysis and acidification tank, a multi-stage anaerobic tank, a contact oxidation tank, a sedimentation tank, an artificial underflow wetland, a field pond, a filter tank and a disinfection tank which are connected in sequence. ; The bottom of the sedimentation tank and the contact oxidation tank is equipped with a connected sludge pump, and the outlet of the sludge pump is connected to the sludge thickening tank; the supernatant produced by the sludge thickening tank flows back into the adjustment tank. The utility model combines high-efficiency anaerobic, aerobic, constructed wetland and field ponds simultaneously, the pollutant removal rate is high, and the effluent quality is good; the high-efficiency anaerobic gas production is good, and biogas is produced as fuel, thereby realizing productivity increase; The constructed wetland is set as subsurface flow, which is less affected by climate, has good sanitary conditions, and the ground can be used for landscape greening, which has a good removal effect of organic pollutants and heavy metals. Seasonal temperature is cool and warm, plants are growing, and aeration is reduced, which not only saves energy and reduces consumption, but also ensures emission standards.

Description

New rural domestic sewage biochemical wetland ecological purification system

technical field

The utility model relates to the technical field of waste/sewage treatment and purification, in particular to a new rural domestic sewage biochemical wetland ecological purification system.

Background technique

The lack of water resources and water pollution in China are seriously restricting the healthy and sustainable development of my country's overall economy. The lagging infrastructure and low management level have inhibited the improvement and improvement of the quality of life of residents in rural areas. The state is stepping up efforts to support new rural water reform projects. Water environment management in rural areas should become an important part of my country's comprehensive environmental management.

In the vast rural areas, there are a lot of production waste (sewage) water discharged from the production of products (including livestock, poultry, aquaculture and required feed) using animals and plants as raw materials, as well as domestic sewage generated by human activities. These sewage are discharged without treatment, which will pollute the environment.

Utility model content

The utility model aims to provide a new rural domestic sewage biochemical wetland ecological purification system, which can purify the new rural domestic sewage.

In order to achieve the above object, the ecological technology adopted by the present utility model, the scheme is as follows:

The new rural domestic sewage biochemical wetland ecological purification system includes successively connected adjustment tanks, hydrolysis and acidification tanks, multi-stage anaerobic tanks, contact oxidation tanks, sedimentation tanks, artificial wetlands, field ponds and filter tanks. grids and/or nets.

Further, a sludge discharge pump is provided at the bottom of the sedimentation tank, and the outlet of the sludge discharge pump is connected with a sludge pipe to discharge sludge to the sludge thickening tank; the supernatant liquid produced by the sludge thickening tank flows back into the adjustment tank for reprocessing.

Further, the biogas generated by the multi-stage anaerobic tank is passed into the gas-water separation device, the water outlet of the gas-water separation device is connected to the adjustment tank, the exhaust port of the gas-water separation device is connected to the desulfurization device, and the exhaust port of the desulfurization device is connected to gas tank.

Preferably, the multi-stage anaerobic pond is a two-stage anaerobic pond.

Further, the water flow between the pools adopts gravity flow to reduce the buried depth of the pipeline as much as possible, and avoid setting up a lifting pump station in the middle, which can reduce energy consumption.

Alternatively, the multi-stage anaerobic tank is a three-stage anaerobic tank.

Further preferably, the three-level anaerobic tanks are respectively: the first-level anaerobic composite sludge bed high-efficiency anaerobic tank, the second-level down-flow fixed biofilm high-efficiency anaerobic tank, and the third-level up-flow anaerobic filtration high-efficiency tank. Anaerobic pool.

Further, a pressure regulating tank is set between the anaerobic tanks.

Further, a disinfection tank is set behind the filter tank, and there is an ultraviolet sterilizer in the disinfection tank, and the effluent is reused or discharged after advanced treatment by a solar ultraviolet sterilizer to kill germs and viruses in the disinfection tank.

Preferably, the sedimentation tank is provided with an inclined tube area, and the upper part of the liquid surface of the contact oxidation tank is provided with a return pipeline to the lower part of the inclined tube area in the sedimentation tank, so as to return the bacteria, strengthen the treatment, and achieve high efficiency.

Compared with the prior art, the utility model has the following remarkable effects:

1. The sewage of the present utility model adopts gravity flow, which reduces the buried depth of the pipeline as much as possible, avoids setting up a pumping station in the middle, and can reduce energy consumption;

2, the utility model combines high-efficiency anaerobic and aerobic at the same time, the pollutant removal rate is high, and the effluent water quality is good; its gas production is good, and biogas is generated as fuel, so as to achieve increased production efficiency and reduce pollution;

3. The aerobic contact is complementary to the aquatic plant treatment technology in the field pond, which can reduce the aeration according to the temperature of the season and the growth of the plants, which not only saves energy and reduces consumption, but also ensures that the discharge meets the standard;

4. The constructed wetland is set as subsurface flow, which is less affected by climate, has good sanitation conditions, and the ground can be used for landscape greening, which has good removal effect on organic pollutants and heavy metals.

Description of drawings

1 is a schematic structural diagram of Embodiment 1;

Fig. 2 is the schematic diagram of three-stage anaerobic tank in embodiment two;

Figure 3 is a sectional view of a constructed wetland;

Fig. 4 is a plan view of a water distributor of a constructed wetland.

Detailed ways

In order to make the objectives, ecological technical solutions and advantages of the present utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings.

Example 1

As shown in Figure 1, the new rural domestic sewage biochemical wetland ecological purification system disclosed in this embodiment includes a regulating tank 1, a hydrolysis and acidification tank 2, a multi-stage anaerobic tank, a contact oxidation tank 5, a sedimentation tank 6, an artificial Wetland 7, field pond 8 and filter tank 9, a disinfection tank 10 is set behind filter tank 9, and there is an ultraviolet sterilizer in the disinfection tank.

A grille and a net 15 are provided at the entrance of the conditioning tank 1 . There are two grids, one with a gap of 10mm and the other with a gap of 5mm. Sewage flows through the grille to remove coarse floating slag, so as not to block the subsequent treatment facilities and equipment, which is beneficial to affect the treatment effect. In order to save costs, manual slag cleaning can be used regularly.

The adjustment tank 1 makes the quality of the treated influent water uniform and the water quantity relatively stable, and can improve the rate of degrading pollutants in the subsequent biochemical treatment tank. A water distributor 12 is arranged at the bottom of the hydrolysis and acidification tank 2 , and a filler 14 is arranged above the water distributor 12 .

As shown in FIG. 1 , this embodiment includes two-stage anaerobic tanks; the first-level anaerobic tank 3 and the second-level anaerobic tank 4 are respectively.

The biogas generated by the multi-stage anaerobic tank is passed into the gas-water separation device 16, the water outlet of the gas-water separation device 16 is connected to the regulating tank 1, the exhaust port of the gas-water separation device 16 is connected to the desulfurization device 17, and the exhaust port of the desulfurization device 17 is connected. Connect the air tank 19.

The bottom of the contact oxidation tank 5 is equipped with a jet aerator 51, and the mixed liquid of low-concentration wastewater and sewage entering the tank is filled with aerobic biofilm area and activated sludge area that is in line with the dissolved oxygen index through aeration and oxygenation, so that the wastewater can be mixed with the activated sludge. The sewage mixture is digested by sufficient vigorous aerobic bacteria, and its removal efficiency is high and stable.

There is an inclined tube area 61 in the sedimentation tank 6, and a return pipe is arranged above the liquid surface of the contact oxidation tank 5 to the bottom of the inclined tube area 61 in the sedimentation tank, so as to return the bacteria, strengthen the treatment, and achieve high efficiency. The bottom of the sedimentation tank 6 is provided with a sludge pump 62, the outlet of the sludge pump 62 is connected to a sewage pipe, the sewage pipe is connected to the sludge concentration tank 13, and the liquid outlet of the sludge concentration tank 13 is communicated with the adjustment tank 1, so that the sludge The supernatant is returned to conditioning tank 1 for reprocessing.

In another embodiment, the bottom of the sedimentation tank and the contact oxidation tank is provided with a connected sludge discharge pump, so that the sludge at the bottom of the sedimentation tank and the contact oxidation tank is discharged into the sludge thickening tank 13 .

The supernatant of the sedimentation tank 6 flows into the large-area constructed wetland 7, and the effluent from the constructed wetland 7 enters the field pond 8 for preliminary advanced treatment, and then passes through the filter tank 9 and the disinfection tank 10 for advanced treatment, and is reused or reused after reaching the discharge standard. Efflux.

In this embodiment, the artificial wetland 7 is an artificial submerged wetland, which is less affected by the climate, has good sanitation conditions, and the ground can be used for landscape greening, and has a good removal effect on organic pollutants and heavy metals.

As shown in Figure 3, the constructed wetland 7 includes a plain soil compacted layer 71, a 100mm-thick C15 cushion layer 72, an SBS waterproof layer 73, a 200mm-thick C20 concrete bottom plate 74, a 600mm-thickness, and a φ50-φ100mm wetland special filler set from bottom to top 75. Geotextile 76, 200mm thick wetland plant special planting soil 77. The thickness of each layer can be reasonably set according to actual needs. Wetland special filler 75 can be selected from pebbles, gravel, river sand, etc.; can be planted with wetland plants such as parasol, sedge, reliflower, black algae, and big drift.

As shown in Figures 3 and 4, a water distributor 78 is arranged in the wetland special filler 75, the main pipe of the water distributor 78 is connected to the water inlet 79, and the branch pipe 781 of the water distributor 78 is cut with a 5cm interval of 5mm wide and 4cm deep. Geotextile cover for mouth wrapping.

The principle of the present utility model is as follows:

The domestic sewage flows into the grid well, and after the sewage passes through the grid 15, its coarse, sinkable solids and floating objects are intercepted;

The self-flow enters the hydrolysis and acidification tank 2, and the hydrolysis and acidification tank 2 decomposes the macromolecular organic matter into small molecular easily degradable organic matter, which plays a good auxiliary role for the subsequent anaerobic biological treatment.

The effluent from the hydrolysis and acidification tank 2 flows into the water distributor 12 in the bottom area of the first-stage anaerobic tank 3, and the water distributor 12 distributes the sewage to the filler 14 of the first-stage anaerobic tank 3. The first-stage anaerobic tank 3 The effluent flows into the water distributor 12 in the bottom area of the second-stage anaerobic tank 4, and the water distributor 12 distributes the sewage to the filler 14 of the second-stage anaerobic tank 4, thereby treating the high-concentration organic matter in the sewage. , decompose most of the organic matter in the sewage under the action of anaerobic bacteria in the two-stage anaerobic tank;

The treated sewage flows into the contact oxidation tank 5, and under the action of aerobic bacteria, the residual organic matter in the sewage is removed;

The water after microbial treatment in the previous stage flows into the sedimentation tank 6, and the clean water after sedimentation in the sedimentation tank 6 flows into the artificial wetland 7. After passing through a large area of artificial subsurface wetland, the COD, BOD, SS and other pollutants are basically degraded and removed.

The effluent from the constructed wetland 7 flows into the field pond 8 for preliminary advanced treatment, and then passes through the filter tank 9 and the disinfection tank 10 for advanced treatment, and is reused or discharged after reaching the discharge standard. The water from the disinfection tank 10 is lifted and reused by the lift pump 11 .

The clear liquid in the sludge thickening tank 13 is introduced into the conditioning tank 1 to continue the microbial treatment, the sludge is concentrated, and the solids in the sludge concentration tank 13 are manually transported out for disposal.

In this embodiment, gravity flow is used for the sewage, the buried depth of the pipeline is reduced as much as possible, and the installation of a midway lifting pump station is avoided, which can reduce energy consumption.

The utility model combines high-efficiency anaerobic and aerobic at the same time, the pollutant removal rate is high, and the effluent quality is good; the gas production is good, and biogas is produced as fuel, so as to realize the increase of production capacity and reduce pollution; The aquatic plant treatment technologies are complementary, which can reduce aeration according to seasonal temperature and plant growth, which not only saves energy and reduces consumption, but also ensures discharge standards; , The ground can be used for landscape greening, and the removal effect of organic pollutants and heavy metals is good.

Embodiment 2

As shown in FIG. 2 , the multi-stage anaerobic tank in this embodiment is a three-stage anaerobic tank. The three-level anaerobic tanks are: the first-level anaerobic composite sludge bed high-efficiency anaerobic tank, the second-level down-flow fixed biofilm high-efficiency anaerobic tank, and the third-level up-flow anaerobic filtration high-efficiency anaerobic tank. The first-stage anaerobic composite sludge bed high-efficiency anaerobic tank is a combination of activated sludge bed and anaerobic filter, and down-flow anaerobic filter filter material biofilm bed of the up-flow anaerobic sludge bed reactor. The water distributor is composed of a "UASB+AF" reactor, referred to as the first-stage UASB+AF. The lower 1.0m of the reactor is the activated sludge bed, and the bottom of the bed is installed with a water distributor connected to the incoming water from the forepond, and above it is a 1.0-3.0m filter (packing) biofilm bed. The above dimensions are provided for reference in this embodiment, and the specific dimensions should be determined according to the amount of water and the effective water depth of the pool. The anaerobic granular sludge is safely enriched in the anaerobic tank, which can greatly improve the unit volume load and pollutant removal rate, reduce the tank capacity, reduce the floor space, and reduce investment and operating costs.

The core of the second-stage downflow fixed biofilm high-efficiency anaerobic tank and the third-stage up-flow anaerobic filtration high-efficiency anaerobic tank is the filter (packing) biofilm bed, which does not consume energy, produces biogas, and is easy to manage. The second-stage downflow fixed biofilm high-efficiency anaerobic tank is referred to as the second-stage DSFF; the third-stage up-flow anaerobic filtration high-efficiency anaerobic tank is referred to as the third-stage AF. A pressure regulating tank is set between the anaerobic tanks.

The utility model is reliable in technology, reasonable in arrangement, simple in operation, convenient in management, reasonable in economy, saves land occupation and energy, and has good economic and social benefits.

The present utility model can also have other various embodiments, and those skilled in the art can make various corresponding changes and deformations according to the present utility model without departing from the spirit and essence of the present utility model.

Claims (10)

1. New rural domestic sewage biochemical wetland ecological purification system, its characterized in that: the device comprises an adjusting tank, a hydrolysis acidification tank, a multistage anaerobic tank, a contact oxidation tank, a sedimentation tank, an artificial subsurface wetland, a field pond and a filter tank which are sequentially communicated, wherein a grid and/or a net is arranged at an inlet of the adjusting tank.

2. The biochemical wetland ecological purification system for the new rural domestic sewage according to claim 1, characterized in that: a sludge discharge pump is arranged at the bottom of the sedimentation tank, and the outlet of the sludge discharge pump is connected with a sludge pipe to discharge sludge to a sludge concentration tank; and supernatant produced by the sludge concentration tank flows back to the regulating tank.

3. The biochemical wetland ecological purification system for the new rural domestic sewage according to claim 1, characterized in that: biogas generated by the multistage anaerobic tank is introduced into a gas-water separation device, a water outlet of the gas-water separation device is communicated with the regulating tank, an exhaust port of the gas-water separation device is communicated with a desulfurization device, and an exhaust port of the desulfurization device is connected with a gas storage tank.

4. The biochemical wetland ecological purification system for the new rural domestic sewage according to claim 1, characterized in that: the multi-stage anaerobic tank is a two-stage anaerobic tank.

5. The system for ecologically purifying the domestic sewage in the new rural area by the biochemical wetland according to the claim 1, 2, 3 or 4, is characterized in that: the water flow among the pools adopts gravity flow.

6. The biochemical wetland ecological purification system for the new rural domestic sewage according to claim 1, characterized in that: the multistage anaerobic tank is a three-stage anaerobic tank.

7. The biochemical wetland ecological purification system for new rural domestic sewage according to claim 6, characterized in that: the three-stage anaerobic tank comprises: the anaerobic composite sludge bed comprises a first-stage anaerobic composite sludge bed high-efficiency anaerobic tank, a second-stage down-flow type fixed biological membrane high-efficiency anaerobic tank and a third-stage up-flow type anaerobic filtration high-efficiency anaerobic tank.

8. The biochemical wetland ecological purification system for new rural domestic sewage according to claim 7, characterized in that: a pressure regulating tank is arranged between the anaerobic tanks.

9. The biochemical wetland ecological purification system for the new rural domestic sewage according to claim 1, characterized in that: a disinfection tank is arranged behind the filter tank, and an ultraviolet sterilizer is arranged in the disinfection tank.

10. The biochemical wetland ecological purification system for the new rural domestic sewage according to claim 1, characterized in that: and an inclined pipe area is arranged in the sedimentation tank, and a return pipe is arranged on the upper part of the liquid surface of the contact oxidation tank and is arranged below the inclined pipe area in the sedimentation tank.

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