CN116534983B - An ecological coupling system for efficiently treating rural gray water and its application - Google Patents
An ecological coupling system for efficiently treating rural gray water and its application Download PDFInfo
- Publication number
- CN116534983B CN116534983B CN202310487931.8A CN202310487931A CN116534983B CN 116534983 B CN116534983 B CN 116534983B CN 202310487931 A CN202310487931 A CN 202310487931A CN 116534983 B CN116534983 B CN 116534983B
- Authority
- CN
- China
- Prior art keywords
- layer
- water
- gravel
- coupling system
- thickness
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/005—Combined electrochemical biological processes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D24/00—Filters comprising loose filtering material, i.e. filtering material without any binder between the individual particles or fibres thereof
- B01D24/007—Filters comprising loose filtering material, i.e. filtering material without any binder between the individual particles or fibres thereof with multiple filtering elements in series connection
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D24/00—Filters comprising loose filtering material, i.e. filtering material without any binder between the individual particles or fibres thereof
- B01D24/02—Filters comprising loose filtering material, i.e. filtering material without any binder between the individual particles or fibres thereof with the filter bed stationary during the filtration
- B01D24/10—Filters comprising loose filtering material, i.e. filtering material without any binder between the individual particles or fibres thereof with the filter bed stationary during the filtration the filtering material being held in a closed container
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/02—Aerobic processes
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/32—Biological treatment of water, waste water, or sewage characterised by the animals or plants used, e.g. algae
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/105—Phosphorus compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/16—Nitrogen compounds, e.g. ammonia
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Water Supply & Treatment (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Organic Chemistry (AREA)
- Environmental & Geological Engineering (AREA)
- Biodiversity & Conservation Biology (AREA)
- Microbiology (AREA)
- Hydrology & Water Resources (AREA)
- Electrochemistry (AREA)
- Molecular Biology (AREA)
- Health & Medical Sciences (AREA)
- General Chemical & Material Sciences (AREA)
- Biotechnology (AREA)
- Botany (AREA)
- Biological Treatment Of Waste Water (AREA)
Abstract
本发明属于生活污水治理技术领域，具体涉及一种高效处理农村灰水的生态耦合系统及其应用。包括下行垂直潜流湿地主体和设置在湿地主体出水口的砂滤装置，湿地主体在竖直方向设置填料层、砾石层和承托层，填料层内部还设置有阴极层，砾石层和承托层之间设置有阳极层，阴极层和阳极层通过电路连接，构成耦合系统内的微生物燃料电池组；砂滤装置在竖直方向设置用于过滤处理水体的活性砂滤层和砾石承托层，底部设置耦合系统出水口。本发明提供的生态耦合系统能够对以有机物为主要污染物的生活灰水进行处理，处理后水质满足《城镇污水处理厂污染物排放标准》(GB 18918‑2002)一级A标准，解决农村生活灰水的净化与排放问题。
The invention belongs to the technical field of domestic sewage treatment, and specifically relates to an ecological coupling system for efficiently treating rural gray water and its application. It includes the main body of a downward vertical underflow wetland and a sand filter device installed at the outlet of the main body of the wetland. The main body of the wetland is provided with a packing layer, a gravel layer and a supporting layer in the vertical direction. There is also a cathode layer, a gravel layer and a supporting layer inside the packing layer. There is an anode layer between them, and the cathode layer and the anode layer are connected through a circuit to form a microbial fuel cell stack in the coupling system; the sand filter device is equipped with an active sand filter layer and a gravel support layer in the vertical direction for filtering and treating water bodies. A coupling system water outlet is provided at the bottom. The ecological coupling system provided by the invention can treat domestic gray water with organic matter as the main pollutant. The treated water quality meets the Class A standard of the "Pollutant Discharge Standard for Urban Sewage Treatment Plants" (GB 18918-2002), solving rural life problems. Gray water purification and discharge issues.
Description
Technical Field
The invention belongs to the technical field of domestic sewage treatment, and particularly relates to an ecological coupling system for efficiently treating rural grey water and application thereof.
Background
The rural domestic sewage mainly comprises toilet sewage (black water), bath water, washing water, wash basin water, kitchen sewage and the like, and is mainly generated in the living process of villagers, so that the sewage is mainly polluted by organic matters, nitrogen, phosphorus and the like, and basically does not contain toxic and harmful pollutants.
According to the generation source of rural domestic sewage, the rural domestic sewage can be divided into black water and grey water. As can be seen from the following table 1, the amounts of black water and grey water in the domestic sewage respectively account for 20% and 80% of the total domestic sewage; the nitrogen and the phosphorus in the black water account for about 90% of domestic sewage, and the gray water accounts for only 10%; in terms of organic matter (in terms of COD), the black water and the grey water account for 50% of each other. The domestic black water has high pollutant concentration, but small sewage quantity, has the characteristics of uniform discharge time period, stable discharge times and discharge quantity in one day, and is used for 4-6 times per day by adults. The domestic grey water has low pollutant concentration, but large water quantity, and has the characteristics of concentrated discharge time period, discharge times and fluctuation of discharge quantity in one day, wherein the discharge time period is concentrated in the morning and the evening, and the total discharge quantity of the domestic grey water is about 90 percent of that of the domestic grey water in one day. In addition, the daily discharge of grey water is related to the season as compared to domestic black water. In general, due to the change of water consumption in the links of washing, bathing and the like of villagers, the daily discharge amount of grey water in summer is higher than that in winter.
TABLE 1 Water quality and Water yield characteristics of fresh Living Black Water and Grey Water
In recent years, the construction and transformation of rural user sanitary toilets enable most rural areas mainly including dry toilets in China to treat excrement and urine independently and effectively, but how to solve domestic ash water except for the excrement and urine in the toilets is still a key problem of smooth promotion of improvement of living environment in the rural areas.
Rural domestic sewage treatment technology is various, and at present purifying tank A 2 The integrated treatment equipment such as O-MBR is the main technology of rural sewage treatment in China, but the main treatment object of the integrated equipment is rural sewage with black water and grey water completely mixed. According to the characteristics of the rural domestic grey water,if the facilities are used for treating the domestic gray water separated from the source, the construction and operation costs are high, and the energy waste and the like can be caused.
At present, most domestic grey water treatment technologies abroad adopt integrated combination technologies of power or micro-power, such as RBC (RBC) and UASB (upflow anaerobic sludge blanket) to treat the grey water, and most technologies are suitable for special occasions such as clubs, schools and the like.
Domestic technology for treating domestic grey water is relatively less studied. Patent CN214693789U discloses a porous composite filler device for rural grey water treatment, and grey water flows into in the first box after being filtered by the earthworm filtering pond, and remaining grease in the grey water can pile up at the surface of water, flows into the purification of microorganism in aquatic weed and porous composite filler in the second box after deoiling, but the device is furnished with the air pump, increases power consumption, has also increased the fortune dimension degree of difficulty in later stage simultaneously, and the device is inside to set up the oil absorption felt, needs frequent change, has also increased the degree of difficulty of later stage fortune dimension equally. Patent CN114605037A discloses an integrated treatment system for recycling rural grey water, the recycling way of treated sewage is mainly used for farmland, green land irrigation and living miscellaneous use, but the system has definite requirements on the inlet water living grey water, and the concentrations of COD, BOD, ammonia nitrogen, anionic surfactant and total escherichia coli in the inlet water are respectively not more than 150mg/L, 80mg/L, 25mg/L, 0.799mg/L and 2.4X10 4 And (3) the number of chlorine tablets per liter, which obviously limits the application of the facility, and meanwhile, the slow-release chlorine tablets are required to be added to the disinfection tank periodically, so that the later investment is increased, and the frequency of operation and maintenance is increased.
Therefore, a system with high efficiency, low cost and simple operation and maintenance is developed aiming at rural domestic grey water, so that the deep mineralization of organic matters in the rural domestic grey water after source separation is realized, the problems of purification and emission of the rural domestic grey water except toilet wastewater are solved, and the system is a very necessary work and has important significance.
Disclosure of Invention
In order to solve the technical problems, the invention firstly provides an ecological coupling system for efficiently treating rural grey water.
The invention adopts the following technical means:
the ecological coupling system for efficiently treating rural grey water comprises a downlink vertical subsurface flow wetland main body and a sand filtering device arranged at a water outlet of the wetland main body, wherein the downlink vertical subsurface flow wetland main body is respectively provided with a filler layer, a gravel layer and a supporting layer for filtering and treating water body from top to bottom in the vertical direction, the inside of the filler layer is also provided with a cathode layer, and the cathode layer is a stainless steel wire mesh; an anode layer is arranged between the gravel layer and the supporting layer, the anode layer is pyrite filler with a layer of stainless steel wire gauze buried in the anode layer, and the cathode layer and the anode layer are connected through a circuit to form a microbial fuel cell group in the coupling system;
the sand filter device is provided with an active sand filter layer and a gravel supporting layer for filtering and treating water body from top to bottom in the vertical direction, and the bottom of the sand filter device is provided with a water outlet of the coupling system.
Preferably, the thickness of the packing layer is 35cm, the position of the packing layer close to the top 2/3 of the thickness is set to be a gas-liquid interface, the thickness of the cathode layer is 1-3 mm, the cathode layer is arranged at the gas-liquid interface of the packing layer, and the bottom surface of the stainless steel wire mesh of the cathode layer is attached to the gas-liquid interface. Preferably, the thickness of the anode layer is 10cm, wherein the thickness of the stainless steel wire mesh is 1-3 mm, and the mesh number is 12; the pyrite filler used in the anode layer is pyrite particles with the particle size of 4-8 mm.
Preferably, the filler layer is formed by mixing quartz sand with the particle size of 0-4 mm, calcined eggshells and volcanic rock according to the volume ratio of 2:1:1; the gravel layer consists of gravels with the grain diameter of 5-10 mm, and the thickness of the gravel layer is 40-60 cm; the supporting layer consists of gravel with the particle size of 10-20 mm, and the thickness of the supporting layer is 10-20 cm.
Preferably, in the sand filtering device, the active sand filtering layer consists of river sand with the particle size smaller than 1mm, and the thickness of the active sand filtering layer is 30cm; the gravel supporting layer consists of gravel with the particle size of 5-10 mm, and the thickness of the gravel supporting layer is 10cm.
Preferably, the surface of the river sand of the active sand filtering layer is provided with a microbial film layer, and the microbial film layer has the thickness of 0.1-2 mm and is formed by mixing one or more microorganisms in Proteus, actinomycetes, flat bacteria, acidobacter and Lvyiella.
Preferably, plants are planted in the packing layer and the active sand filter layer, the plants form a plant planting layer above the packing layer and the active sand filter layer, and the plants comprise emergent aquatic wetland plants and cold-resistant wetland plants.
Preferably, a water outlet is arranged at the bottom of the supporting layer, a clarification tank is further arranged between the water outlet and the sand filtering device, and the sand filtering device is connected with an overflow water outlet at the top of the clarification tank.
Preferably, the main body of the downward vertical subsurface flow wetland and the sand filtering device are arranged below the ground, and the surfaces of the packing layer and the active sand filtering layer are flush with the ground.
The invention also provides application of the ecological coupling system for efficiently treating rural grey water in rural domestic grey water treatment, and the water body treated by the microbial fuel cell type constructed wetland and the shallow active sand filter device of the pyrite reinforced anode, particularly rural domestic grey water, has COD (chemical oxygen demand) of effluent generally below 30mg/L and meets the first-level A standard of pollutant emission standard of urban sewage treatment plants (GB 18918-2002).
The working principle of the invention is as follows: the water body to be treated such as the domestic gray water automatically flows into the upper part of the microbial fuel cell type constructed wetland of the pyrite reinforced anode, and the structure and the position of the mixed filler layer with the fine particle size, the oxygenation of the inflow water, the oxygen secretion of the plant root system and the like provide good oxygen supply for the layer, so that part of organic matters, ammonia nitrogen, phosphate and the like in the domestic gray water are degraded or mineralized and removed; the cathode region is positioned at the gas-liquid interface, and compared with the anode, the oxygen is relatively sufficient, in which case, the supply of electron acceptors in the cathode region can be increased, and the electron transfer capability of the system can be further increased; the medium-grain size framework filler layer is a traditional gravel layer, the gravel layer is positioned below the liquid level, and because of lack of aeration measures, most of microorganisms covered on the surface of the gravel are anaerobic microorganisms, and pollutants such as organic matters are anaerobically degraded; the reinforcing material of the anode region is pyrite, and its main component is FeS 2 In an anaerobic environment, under the action of iron oxidation/reduction bacteria, through Fe 2+ /Fe 3+ Interconversion of the pair, the organic matter acting as an electron donor in an anaerobic environment, transferring part of the electrons to Fe 3+ Another part of electrons are transmitted to the cathode, fe 3+ After obtaining electrons, fe is converted 2+ ，Fe 2+ Under the action of iron oxidizing bacteria, electrons are lost to convert into Fe 3+ The repeated circulation is carried out in such a way, so that the microbial electrochemical degradation of pollutants such as organic matters in the grey water is promoted, and the pollutants are removed from the grey water; after the life lime water flows out of the clarification tank, the life lime water enters the sand filtering device, and aerobic microorganisms are inoculated to the surface of river sand of the active sand filtering layer, so that the starting period of degrading pollutants such as organic matters by the sand filtering can be shortened, free drainage of the sand filtering is also promoted, atmospheric reoxygenation is also promoted, good oxygen supply is maintained in the sand filtering system, and the removal of the pollutants is facilitated.
The beneficial effects of the invention are as follows:
according to the invention, an ecological coupling system for efficiently treating rural grey water is constructed by utilizing the microbial fuel cell type constructed wetland and shallow active sand filter device of the pyrite reinforced anode, and the wetland and sand filter device are connected in series, so that the advanced treatment of domestic grey water can be realized, and the water quality treatment effect is improved. The pyrite arranged in the microbial fuel cell type constructed wetland can strengthen the anode of the microbial fuel cell type constructed wetland, so that the quantity, abundance and activity of electrogenerated bacteria in the anode region are improved, and the removal efficiency of pollutants such as organic matters is further improved; the shallow active sand filter device is inoculated with aerobic microorganisms on one hand, shortens the starting period of sand filtration, and discharges water freely on the other hand, so that good atmospheric reoxygenation can be ensured, and the growth of the aerobic microorganisms is benefited.
The ecological coupling system is a power-free consumption system, and experiments prove that the effluent meets the first-level A standard of pollutant emission standard of urban sewage treatment plants (GB 18918-2002), and can be directly discharged or used for farmland irrigation, flushing of living miscellaneous uses and the like.
The ecological coupling system belongs to an ecological bioelectrochemical process, and has lower construction cost compared with the existing integrated facilities such as a purifying tank and the like; because the system has no power consumption, the domestic grey water flows in facilities by gravity flow, and therefore, the operation and maintenance cost is lower. Under the condition that the same water outlet standard is met, the facility construction cost of the system is only 1/2-1/7 of that of the integrated treatment facilities such as the purifying tank, the operation and maintenance cost is about 1/4-1/8 of that of the integrated treatment facilities, and the economic benefit is remarkable.
Drawings
FIG. 1 is a schematic diagram of an ecological coupling system of the present invention;
FIG. 2 is a schematic diagram of an arrangement of a microbial fuel cell;
FIG. 3 shows the COD content change of the water body before and after the treatment of the domestic gray water by the ecological coupling system in the embodiment 2 of the invention;
fig. 4 shows LAS content change of water body before and after treatment of living grey water by the ecological coupling system in embodiment 3 of the present invention.
The meaning of the reference numerals in the figures is as follows:
10-wetland main body 11-water inlet 12-water outlet
20-packing layer 30-gravel layer 40-supporting layer
51-cathode layer 52-anode layer 53-stainless steel mesh 54-pyrite filler 55-circuit
60-plant growing layer
70-clarifier 71-overflow water outlet
80-sand filter device 81-active sand filter layer 82-gravel support layer 83-coupling system water outlet
Detailed Description
The technical scheme of the invention is described in more detail below with reference to examples.
Example 1
As shown in fig. 1-2, the ecological coupling system for efficiently treating rural grey water is characterized by comprising a downlink vertical subsurface flow wetland main body 10 and a sand filtering device 80 arranged at a water outlet 12 of the wetland main body, wherein the downlink vertical subsurface flow wetland main body 10 is respectively provided with a packing layer 20, a gravel layer 30 and a supporting layer 40 for filtering and treating water from top to bottom in the vertical direction, the inside of the packing layer 20 is also provided with a cathode layer 51, an anode layer 52 is arranged between the gravel layer 30 and the supporting layer 40, and the cathode layer 51 and the anode layer 52 are connected through a circuit 55 to form a microbial fuel cell group in the coupling system.
The filler layer 20 is formed by mixing quartz sand with the particle size of 0-4 mm, calcined eggshells and volcanic rock according to the volume ratio of 2:1:1, and the total thickness is 35cm; the above calcined eggshell is obtained by calcining at 900deg.C to convert calcium carbonate into calcium oxide. The gravel layer 30 consists of gravels with the particle size of 5-10 mm, and the total thickness is 40-60 cm; the supporting layer 40 is composed of gravel having a particle size of 10 to 20mm and a total thickness of 10 to 20cm.
The position of the packing layer 20 close to the top 2/3 of the thickness is set as a gas-liquid interface, the cathode layer 51 is arranged at the gas-liquid interface of the packing layer 20, the cathode layer 51 is a stainless steel wire net 53, the thickness is 1-3 mm, and the lower bottom surface of the stainless steel wire net 53 is attached to the gas-liquid interface. The gravel layer 30 is positioned below the liquid surface, belongs to anaerobic environment, the anode layer 52 is arranged below the gravel layer 30, the anode layer 52 is pyrite filler 54 with a layer of stainless steel wire mesh 53 buried inside, the thickness of the anode layer 52 is 10cm, and the thickness of the stainless steel wire mesh 53 is 1-3 mm. The pyrite filler used in the anode layer 52 is pyrite particles with the particle size of 4-8 mm, and the mesh numbers of the stainless steel wires in the cathode layer 51 and the anode layer 52 are 12 meshes. The sand filter device 80 is provided with an active sand filter layer 81 and a gravel supporting layer 82 for filtering and treating the water body from top to bottom in the vertical direction, and the bottom of the sand filter device 80 is provided with a coupling system water outlet 83.
The active sand filter layer 81 consists of river sand with the particle size smaller than 1mm, and the thickness of the active sand filter layer 81 is 30cm; the gravel support layer 82 is composed of gravel having a particle size of 5 to 10mm, and the thickness of the gravel support layer 82 is 10cm.
Plants are planted in the packing layer 20 and the active sand filter layer 81, and the plants form a plant planting layer 60 above the packing layer 20 and the active sand filter layer 81, wherein the plants comprise large emergent aquatic wetland plants with long growth periods such as reed and typha, and cold-resistant wetland plants such as flower-leaf reed, evergreen iris, and flowers. The plant density is selected according to the size of the wetland, for example 15-25 plants/m 2 Etc.
In the system, the bottom of the supporting layer 40 is provided with a water outlet 12, a clarification tank 70 is also arranged between the water outlet 12 and a sand filtering device 80, and the sand filtering device 80 is connected with an overflow water outlet 71 at the top of the clarification tank 70.
When the coupling system is used for treating rural domestic grey water such as washroom washing water, bath water, wash basin water, miscellaneous drain water, kitchen rinse water and the like, the domestic grey water firstly removes most suspended matters, then flows into the wetland main body 10 from the water inlet 11 of the wetland main body 10 by means of gravity, flows from top to bottom, passes through the upper part of the packing layer 20, the cathode layer 51, the lower part of the packing layer 20 and the gravel layer 30 which are arranged in the wetland system, and then enters the anode layer 52.
The 2/3 part of the filler layer 20 is positioned above the gas-liquid interface, so that good atmospheric reoxygenation can be performed, and the aerobic degradation of organic matters and the nitration reaction of nitrogen are facilitated. The volcanic rock in the packing layer 20 has stronger adsorption efficiency on ammonia nitrogen in the domestic grey water, and the calcium content of the calcined eggshells is increased, so that the adsorption of phosphorus in the domestic grey water is facilitated. Through adding volcanic rock and eggshells into quartz sand serving as framework filler, the removal of ammonia nitrogen and total phosphorus in the domestic grey water is enhanced.
The anode layer 52 is a pyrite-reinforced anode region, and the stainless steel wire mesh 53 is placed in the middle of the pyrite filler 54, so that iron-oxidizing bacteria and iron-reducing bacteria can easily grow in the natural environment in the presence of iron. Production of Fe by pyrite 2+ ，Fe 2+ /Fe 3+ Under the action of electricity in anaerobic environment, the enriched iron oxidizing bacteria/iron reducing bacteria are mutually transformed under natural conditions, so that not only can the abundance and activity of the electrogenesis bacteria in the anode region be improved, but also the internal resistance of the system can be reduced, and the degradation of pollutants such as organic matters in water can be accelerated. The effluent then passes through the supporting layer 40, enters the clarifying tank 70 from the water outlet 12, then enters the shallow active sand filter device 80 from the overflow water outlet 71 of the clarifying tank 70, wherein the thickness of the active sand filter layer 81 in the sand filter device 80 is only 30cm, and the active sand filter device is in a free drainage state, so that pollutants such as undegraded soluble organic matters and the like can be subjected to aerobic degradation, the river sand surface of the active sand filter layer 81 is provided with a microbial film layer, the microbial film layer can be arranged by using living ash water inoculated with aerobic microorganisms to flow through the active sand filter layer 81, the thickness of the microbial film layer is 0.1-2 mm, and the microbial film layer is formed by Protebacter (Protebacter), actinomycetes (actinomycetes), planocomycetes (Planocomycetes), acidobacter (Acidobacter) and greenOne or more microorganisms in the Curvularia (Chloroflex) are formed, and the arrangement of the microbial film layer can shorten the starting period of degrading organic matters by sand filtration. The living grey water is in a free drainage state in the active sand filter layer 81, which is favorable for natural reoxygenation and aerobic degradation of undegraded pollutants such as soluble organic matters. The sand filter device 80 is used for deeply purifying the water discharged from the microbial fuel cell type constructed wetland of the pyrite reinforced anode, and finally the discharged water meets the first grade A standard GB18918-2002 of pollutant emission standards of urban sewage treatment plants.
The main body 10 of the downward vertical subsurface flow wetland, the clarifier 70 and the sand filter device 80 can be arranged below the ground, and the surfaces of the packing layer 20 and the active sand filter layer 81 are flush with the ground. In a specific case, the water inlet 11 of the downward vertical subsurface flow wetland main body 10 is provided with a water inlet pipe, the inner diameter of the water inlet pipe is 110mm, and the center of the water inlet pipe is 30cm lower than the ground.
The ecological coupling system provided by the invention can be selectively manufactured into prefabricated members with or without plant planting layers. The wet land main body 10, the clarifier 70 and the sand filtering device 80 are processed to a desired size using stainless steel plates or PVC plates, and a packing layer 20, a gravel layer 30, a supporting layer 40, and cathode and anode layers 51 and 52, an active sand filtering layer 81 and a gravel supporting layer 82 of the microbial fuel cell are respectively provided.
Example 2
The rural grey water is treated, the rural grey water and black water are subjected to source separation, the black water is used as fertilizer to recycle farmlands, domestic grey water enters a pretreatment unit firstly, larger particle pollutants are removed, meanwhile, partial pollutants such as organic matters are subjected to anaerobic degradation, then the domestic grey water enters a descending vertical subsurface flow wetland main body 10 through a water inlet 11, at a fine particle size packing layer 20, partial pollutants are trapped by the packing layer 20, then enter a medium particle size gravel layer 30, the gravel layer 30 belongs to a framework packing layer of the wetland, most of the pollutants are degraded by microbial films on the surface layer of gravel, finally enter a supporting layer 40, flow into a clarification tank 70 from a water outlet 12, enter a sand filtering device 80 after being clarified through the clarification tank 70, the non-removed pollutants mainly adopt soluble organic matters, further purification is obtained after the domestic grey water enters a shallow active sand filtering facility, and finally the effluent flows out from a coupling system water outlet 83 to be received and utilized.
The index range of the quality of the inflow water of the domestic gray water generated by a certain rural family is as follows: COD: 125-429 mg/L, LAS 7.1-20.6 mg/L, TN 12.2-44.8 mg/L, ammonia nitrogen: 9.6-22.8 mg/L, TP: 1.1-2.5 mg/L, SS: 80-253 mg/L, turbidity: 71.6 to 211.9NTU, pH:6.91 to 7.46.
As shown in fig. 3 and 4, the treatment of the microbial fuel cell type wetland reinforced by iron and carbon is performed, and the effluent indexes during the stable effluent period are as follows: COD:32mg/L, LAS: the removal rate is 89.3 percent and 99.3 percent respectively at 0.09mg/L, and meets the first-level A standard of GB18918-2002 of pollutant emission Standard of urban wastewater treatment plants.
Other indices TN:6.4mg/L, ammonia nitrogen: 4.8mg/L, TP:0.9mg/L, SS:6mg/L, turbidity: the 2NTU, except TP meets the first-level B standard, and the other indexes meet the first-level A standard.
After the system is operated for a long time and the domestic grey water is continuously treated for about 150 days, the ecological coupling system can still normally operate without blocking and other phenomena.
The system ionizes Fe by pyrite based on the traditional microbial fuel cell type constructed wetland 2+ The electron transfer speed of the anode region is enhanced, the abundance, the quantity and the activity of electrogenesis bacteria of the anode region are further improved, and the removal performance of pollutants such as organic matters of the anode region is improved. On the basis of ordinary sand filtration, the facility is used for inoculating aerobic microorganisms into the domestic grey water, so that the surface of river sand is covered with a layer of aerobic biomembrane, and simultaneously, the function of air reoxygenation is enhanced and the environment required by the growth of the aerobic microorganisms is maintained by adding the function of free drainage, thereby achieving the purpose of further removing pollutants such as organic matters in the domestic grey water.
Example 3
A representative rural family is selected in a nest lake river basin to develop pilot scale research on treating rural grey water by using a microbial fuel cell type constructed wetland and shallow active sand filtration coupling process with iron ore as an anode reinforcing material, and a research area is located in Dan Tangzhen horse collection community in Feidong county of the combined fertilizer city. Firstly analyzing the water quantity and water quality characteristics of rural grey water after rural family source separation, and secondly evaluating the operation effect of the ecological coupling process for treating the rural grey water, thereby providing reference for further popularization and application of the process in the rural area.
The microbial fuel cell type constructed wetland for the pyrite reinforced anode for experiments and the outer body of the shallow active sand filtration facility are manufactured by stainless steel plates, and are built by burying, and wetland plants planted on the planting layer are reed and four-season iris.
The quality index of the inlet water of the domestic gray water is as follows: COD: 111-478 mg/l, LAS 6.9-32.6 mg/l, TN 10.951.7mg/l, ammonia nitrogen: 7.8-28.1 mg/l, TP: 0.7-2.7 mg/l, SS: 76-276 mg/l, turbidity: 56.9 to 232.3NTU, pH value: 6.87 to 7.51.
The microbial fuel cell type constructed wetland and shallow active sand filtration facility treatment of pyrite reinforced anode are adopted, the average concentration values of main pollution indexes COD and LAS in the effluent are respectively 28mg/L and 0.05mg/L, the removal rates are respectively 90.6.3% and 99.7%, the first-level A standard of pollutant emission standard of urban sewage treatment plants (GB 18918-2002) is met, and the average values of other indexes TN, ammonia nitrogen, TP, SS and turbidity are respectively 5.1mg/L, 3.9mg/L, 0.4mg/L, 5mg/L and 1NTU, all of which meet the first-level A standard. After the facility runs for about 160 days, the facility still runs normally, and no phenomena such as blockage and the like occur.
According to the ecological coupling system provided by the invention, when the microbial fuel cell type constructed wetland and the shallow active sand filtration treatment facility of the pyrite reinforced anode treat rural domestic grey water with organic matters as main pollutants, under the condition of meeting the same effluent standard, if the first-level A or B standard is met, the construction cost and the operation and maintenance cost of the facility are far lower than those of the existing integrated sewage treatment equipment such as a purifying tank, and good economic benefits can be obtained; meanwhile, the whole process of the invention adopts ecological and microbial electrochemical processes to treat the domestic gray water, and no extra power is consumed, so that good ecological benefits can be obtained.
The above embodiments are only for illustrating the technical scheme of the present invention, and are not limiting to the present invention; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (5)
1. The ecological coupling system for efficiently treating rural grey water is characterized by comprising a downlink vertical subsurface flow wetland main body (10) and a sand filtering device (80) arranged at a water outlet (11) of the wetland main body, wherein the downlink vertical subsurface flow wetland main body (10) is respectively provided with a packing layer (20), a gravel layer (30) and a supporting layer (40) for filtering and treating water body from top to bottom in the vertical direction, the inside of the packing layer (20) is also provided with a cathode layer (51), and the cathode layer (51) is a stainless steel wire mesh (53); an anode layer (52) is arranged between the gravel layer (30) and the supporting layer (40), the anode layer (52) is a pyrite filler (54) with a layer of stainless steel wire mesh (53) buried inside, and the cathode layer (51) and the anode layer (52) are connected through a circuit (55) to form a microbial fuel cell stack in a coupling system;
the thickness of the packing layer (20) is 35cm, the position, close to the top, of the packing layer (20) with the thickness of 2/3 is set to be a gas-liquid interface, the thickness of the cathode layer (51) is 1-3 mm, the cathode layer (51) is arranged at the gas-liquid interface of the packing layer (20), and the lower bottom surface of a stainless steel wire mesh (53) of the cathode layer (51) is attached to the gas-liquid interface; the packing layer (20) is formed by mixing quartz sand with the particle size of 0-4 mm, calcined eggshells and volcanic rock according to the volume ratio of 2:1:1; the gravel layer (30) consists of gravels with the particle size of 5-10 mm, and the thickness of the gravel layer (30) is 40-60 cm; the supporting layer (40) consists of gravel with the particle size of 10-20 mm, and the thickness of the supporting layer (40) is 10-20 cm;
the sand filtering device (80) is provided with an active sand filtering layer (81) and a gravel supporting layer (82) for filtering and treating a water body respectively from top to bottom in the vertical direction, and the bottom of the sand filtering device (80) is provided with a coupling system water outlet (83); the active sand filter layer (81) consists of river sand with the particle size smaller than 1mm, and the thickness of the active sand filter layer (81) is 30cm; the gravel supporting layer (82) consists of gravel with the particle size of 5-10 mm, and the thickness of the gravel supporting layer (82) is 10 cm; the surface of the river sand of the active sand filtering layer (81) is provided with an aerobic microbial film layer, the thickness of the microbial film layer is 0.1-2 mm, and the microbial film layer is formed by mixing one or more microorganisms in Proteus, actinomycetes, flat bacteria, acidomycota and Curvularia;
plants are planted in the packing layer (20) and the active sand filter layer (81), the plants form a plant planting layer (60) above the packing layer (20) and the active sand filter layer (81), and the plants comprise emergent aquatic wetland plants and cold-resistant wetland plants.
2. The ecological coupling system for efficiently treating rural grey water according to claim 1, wherein the thickness of the anode layer (52) is 10-cm, the thickness of the stainless steel wire mesh (53) is 1-3 mm, the mesh number is 12, and the pyrite filler used for the anode layer (52) is pyrite particles with the particle size of 4-8 mm.
3. The ecological coupling system for efficiently treating rural greywater according to claim 1, wherein a water outlet (12) is arranged at the bottom of the supporting layer (40), a clarification tank (70) is further arranged between the water outlet (12) and a sand filtering device (80), and the sand filtering device (80) is connected with an overflow water outlet (71) at the top of the clarification tank (70).
4. An ecological coupling system for efficiently treating rural greywater as claimed in claim 1, wherein said main body (10) and sand filter (80) of said downgoing vertical subsurface flow wetland are both disposed below the ground, and the surfaces of the filler layer (20) and active sand filter (81) are flush with the ground.
5. Use of the ecological coupling system for efficiently treating rural greywater according to claim 1 in rural domestic greywater treatment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310487931.8A CN116534983B (en) | 2023-04-28 | 2023-04-28 | An ecological coupling system for efficiently treating rural gray water and its application |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310487931.8A CN116534983B (en) | 2023-04-28 | 2023-04-28 | An ecological coupling system for efficiently treating rural gray water and its application |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN116534983A CN116534983A (en) | 2023-08-04 |
| CN116534983B true CN116534983B (en) | 2023-12-01 |
Family
ID=87453635
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310487931.8A Active CN116534983B (en) | 2023-04-28 | 2023-04-28 | An ecological coupling system for efficiently treating rural gray water and its application |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116534983B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117466459A (en) * | 2023-08-30 | 2024-01-30 | 中国科学院南京土壤研究所 | Method for building sewage treatment system of multi-step constructed wetland |
| CN120681845B (en) * | 2025-06-13 | 2025-12-16 | 中国环境科学研究院 | Iron-carbon micro-electrolysis coupling soil infiltration system, application and sewage treatment method |
Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102249423A (en) * | 2011-07-13 | 2011-11-23 | 东南大学 | Structure for simultaneously realizing ecological sewage treatment and microbiological fuel cell electrogenesis |
| CN106745772A (en) * | 2016-12-29 | 2017-05-31 | 东南大学 | Row array type microbiological fuel cell artificial marsh sewage treatment system |
| CN108706735A (en) * | 2018-05-25 | 2018-10-26 | 兰州交通大学 | A kind of landscape type kitchen refuse ecologic processor |
| CN109081426A (en) * | 2018-08-29 | 2018-12-25 | 东华大学 | A kind of Microbial fuel cell type combined artificial wetland of low internal resistance |
| CN110854420A (en) * | 2019-11-29 | 2020-02-28 | 南京大学盐城环保技术与工程研究院 | Microbial fuel cell with straw and sludge as matrix, construction method thereof and sludge treatment method |
| CN112174293A (en) * | 2020-08-25 | 2021-01-05 | 兰州理工大学 | An Electro-Enhanced Bioretention System for Removing Low-Concentration Antibiotics |
| CN113024039A (en) * | 2021-03-19 | 2021-06-25 | 南京市市政设计研究院有限责任公司 | Bioelectricity-enhanced subsurface flow wetland system and pollutant treatment method |
| CN113044963A (en) * | 2021-03-15 | 2021-06-29 | 广东昂为环保产业有限公司 | Active biological filter material and preparation method and application thereof |
| CN113321369A (en) * | 2021-02-08 | 2021-08-31 | 重庆大学 | Tidal flow artificial wetland capable of simultaneously removing nitrogen and phosphorus |
| CN114906922A (en) * | 2022-05-16 | 2022-08-16 | 贵州大学 | Rural sewage biochemical treatment system based on constructed wetland microbial fuel cell |
| CN114956245A (en) * | 2022-05-18 | 2022-08-30 | 杭州霖波环保科技有限公司 | Sewage treatment mixed filter material, preparation method and application thereof, and sewage treatment system |
| CN218879614U (en) * | 2023-02-13 | 2023-04-18 | 中交七鲤古镇(赣州)文化旅游有限公司 | Constructed wetland-microbial fuel cell system |
-
2023
- 2023-04-28 CN CN202310487931.8A patent/CN116534983B/en active Active
Patent Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102249423A (en) * | 2011-07-13 | 2011-11-23 | 东南大学 | Structure for simultaneously realizing ecological sewage treatment and microbiological fuel cell electrogenesis |
| CN106745772A (en) * | 2016-12-29 | 2017-05-31 | 东南大学 | Row array type microbiological fuel cell artificial marsh sewage treatment system |
| CN108706735A (en) * | 2018-05-25 | 2018-10-26 | 兰州交通大学 | A kind of landscape type kitchen refuse ecologic processor |
| CN109081426A (en) * | 2018-08-29 | 2018-12-25 | 东华大学 | A kind of Microbial fuel cell type combined artificial wetland of low internal resistance |
| CN110854420A (en) * | 2019-11-29 | 2020-02-28 | 南京大学盐城环保技术与工程研究院 | Microbial fuel cell with straw and sludge as matrix, construction method thereof and sludge treatment method |
| CN112174293A (en) * | 2020-08-25 | 2021-01-05 | 兰州理工大学 | An Electro-Enhanced Bioretention System for Removing Low-Concentration Antibiotics |
| CN113321369A (en) * | 2021-02-08 | 2021-08-31 | 重庆大学 | Tidal flow artificial wetland capable of simultaneously removing nitrogen and phosphorus |
| CN113044963A (en) * | 2021-03-15 | 2021-06-29 | 广东昂为环保产业有限公司 | Active biological filter material and preparation method and application thereof |
| CN113024039A (en) * | 2021-03-19 | 2021-06-25 | 南京市市政设计研究院有限责任公司 | Bioelectricity-enhanced subsurface flow wetland system and pollutant treatment method |
| CN114906922A (en) * | 2022-05-16 | 2022-08-16 | 贵州大学 | Rural sewage biochemical treatment system based on constructed wetland microbial fuel cell |
| CN114956245A (en) * | 2022-05-18 | 2022-08-30 | 杭州霖波环保科技有限公司 | Sewage treatment mixed filter material, preparation method and application thereof, and sewage treatment system |
| CN218879614U (en) * | 2023-02-13 | 2023-04-18 | 中交七鲤古镇(赣州)文化旅游有限公司 | Constructed wetland-microbial fuel cell system |
Non-Patent Citations (1)
| Title |
|---|
| 以黄铁矿为阳极材料的人工湿地-微生物燃料电池性能的研究;陈健;中国优秀硕士学位论文全文数据库（工程科技I辑）;第B015-1253页 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN116534983A (en) | 2023-08-04 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101973637B (en) | River channel purification system for processing rural domestic sewage | |
| CN101928096B (en) | Sewage treatment method and system in ecological sensitive areas | |
| CN101671092B (en) | Sewage treatment system and method for combined tidal flow artificial wetland | |
| CN103449658B (en) | Sewage treatment method | |
| CN102351378B (en) | Method and system for processing rural sewage in artificial wetlands | |
| CN102775025B (en) | Municipal life wastewater treatment system with high efficiency and low energy consumption | |
| CN101481194B (en) | town domestic sewage treatment process | |
| CN107055754B (en) | Circulating zero-valent iron biofilter for strengthening treatment of rural domestic sewage | |
| CN105502825A (en) | Integrated domestic sewage treatment equipment and treatment method | |
| CN101928095A (en) | A kind of decentralized domestic sewage treatment method | |
| CN203768124U (en) | Ecological filter for micro-polluted water treatment | |
| CN102923860A (en) | Method for enhanced nitrogen removal of tidal flow-horizontal subsurface flow hybrid constructed wetland and system thereof | |
| CN101186416A (en) | Packaged staged membrane bioreactor device for treating sewage or slightly polluted raw water | |
| CN103951064A (en) | Ecological filter used for micro-polluted water treatment | |
| CN102976548A (en) | Zero emission district sewage resource treatment apparatus | |
| CN116534983B (en) | An ecological coupling system for efficiently treating rural gray water and its application | |
| CN111204927A (en) | Ecological public toilet sewage treatment circulating system and sewage treatment and recycling method | |
| CN108178438A (en) | A kind of rural domestic sewage treatment system and purification method | |
| CN205398371U (en) | Rural miniaturized integration sewage treatment unit | |
| CN211644786U (en) | Biochemical wetland ecological purification system for new rural domestic sewage | |
| CN210656590U (en) | Buried rural domestic sewage treatment system | |
| CN103183446A (en) | Treatment device for piggery wastewater | |
| CN112299654A (en) | Movable black smelly water treatment equipment | |
| CN107529525A (en) | A kind for the treatment of method for rural sewage and system | |
| CN102515434A (en) | Method for sewage treatment in compound tower-type ecological filtering pool |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |