CN217459136U - A can dismantle membrane reactor for farmland drainage nitrogen and phosphorus removal - Google Patents
A can dismantle membrane reactor for farmland drainage nitrogen and phosphorus removal Download PDFInfo
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- CN217459136U CN217459136U CN202220333031.9U CN202220333031U CN217459136U CN 217459136 U CN217459136 U CN 217459136U CN 202220333031 U CN202220333031 U CN 202220333031U CN 217459136 U CN217459136 U CN 217459136U
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Abstract
A detachable membrane reactor for nitrogen and phosphorus removal of farmland drainage comprises a channel allowing water to flow, and a grit chamber, a coarse grid, a gravel wall, a fine grid, an aerobic reaction tank and an anaerobic reaction tank which are sequentially arranged in the channel along the water flow direction; the gravel wall is formed by stacking gravels, and the gaps of the gravels allow water flow to pass through; a water retaining partition plate is arranged between the fine grid and the aerobic reaction tank; the anaerobic reaction area is characterized in that a drain pipe is laid at the bottom of the anaerobic reaction area, the drain pipe is provided with a plurality of water inlet holes, the drain pipe is communicated with a drain concealed pipe, and a drain outlet of the drain concealed pipe is communicated with a downstream ditch. The utility model discloses convenient to use, and simple structure, the consumptive material is few, low in manufacturing cost.
Description
Technical Field
The utility model belongs to the technical field of sewage treatment device, in particular to a can dismantle membrane reactor for farmland drainage nitrogen and phosphorus removal.
Background
Agricultural non-point source pollution becomes an important factor influencing water environment, is becoming one of main reasons for deterioration of ecological environment in China, and seriously restricts sustainable development of agriculture and rural economic environment. In the process of precipitation or irrigation, nitrogen and phosphorus nutrient salts in the farmland are discharged into surface water through a farmland drainage 'canal-rural canal-bucket canal-branch canal-main canal' system, so that a large amount of nitrogen and phosphorus enter a water body, and water environment pollution is caused.
For the control of agricultural non-point source pollution, the "Best Management Practice (BMPS)" proposed by the United States Environmental Protection Agency (USEPA) is currently in widespread use. The currently proposed and applied technologies mainly comprise a buffer zone control technology, an oxidation pond technology, an artificial wetland technology and a farmland tail water ecological ditch and buffer zone combined purification technology. However, the engineering occupies a large area, and is easy to generate siltation and saturation phenomena, so that the ecological engineering is greatly limited by climatic conditions and vegetation growth conditions, and has unstable purification effect, and the application of the ecological engineering has great limitation. The traditional sewage treatment processes and the application thereof are more and more mature, but the processes have the limiting factors of high basic investment cost, high energy consumption and the like, and require special personnel to operate and maintain.
There is therefore a need for integration of the prior art and improvement of the existing processing devices. The method seeks a sewage treatment technology which is low in cost, high in efficiency and easy to operate, further expands the application range of sewage treatment, meets social and market demands, and particularly has a good application prospect and an important socially significant agricultural non-point source pollution treatment means for agricultural areas with various economic conditions and cultural backgrounds.
SUMMERY OF THE UTILITY MODEL
In order to overcome the defects in the prior art, the utility model aims to provide a detachable membrane reactor for nitrogen and phosphorus removal of farmland drainage.
In order to achieve the above objects and other related objects, the present invention provides a technical solution: a detachable membrane reactor for denitrification and dephosphorization of farmland drainage comprises a channel allowing water to flow, and a grit chamber, a coarse grid, a gravel wall, a fine grid, an aerobic reaction tank and an anaerobic reaction zone which are sequentially arranged in the channel along the water flow direction; the gravel wall is formed by stacking gravels, and the gaps of the gravels allow water flow to pass through; a water retaining partition plate is arranged between the fine grid and the aerobic reaction tank; the anaerobic reaction area is characterized in that a drain pipe is laid at the bottom of the anaerobic reaction area, the drain pipe is provided with a plurality of water inlet holes, the drain pipe is communicated with a drain concealed pipe, and a drain outlet of the drain concealed pipe is communicated with a downstream ditch.
The preferable technical scheme is as follows: the gravel wall is composed of a gabion net cage and gravel filled in the gabion net cage.
The preferable technical scheme is as follows: the distance between the bars of the thick grating is 1cm, and the distance between the bars of the thin grating is 4 mm.
The preferable technical scheme is as follows: the water retaining partition plate is arranged along the tank wall of one side of the aerobic reaction tank facing the fine grid.
The preferable technical scheme is as follows: the two inner side walls of the aerobic reaction tank are arranged at intervals of 1.5-2.5cm and are spaced by 0.4-0.6cm, the aerobic reaction tank is limited by steel nails, the aerobic reaction tank is directly connected to a single threaded frame during film hanging, and then the threaded frame is vertically inserted into the tank bottom; the net bag of the anaerobic reaction tank is filled with at least one of sawdust, oyster shell, hickory shell, slag or steel slag as filler.
The preferable technical scheme is as follows: the drain pipe is made of PVC, and the drain pipe is coated with a gauze.
Because of the application of the technical scheme, the utility model discloses the beneficial effect who has does:
the utility model discloses need not whole dismantlement, convenient to use, and simple structure, the consumptive material is few, low in manufacturing cost. The problems of difficult demoulding and unpowered aeration are effectively solved, the aerobic environment in the layer is ensured by good water and air permeability, and the degradation rate of organic matters is greatly improved. The anaerobic tank is designed to be convenient to disassemble because the filler is difficult to maintain the nitrogen and phosphorus removal effects for a long time. When the device is used daily, the handle is put down and buckled with the fixing bolts of the furrows and ridges together, and the device is fixedly clamped by matching with the batten limiting plate at the top of the furrows.
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
In the above drawings, 1, a grit chamber; 2. coarse grating; 3. a gravel wall; 4. fine grids; 5. an aerobic reaction zone; 6. an anaerobic reaction zone; firstly, a water retaining clapboard; secondly, ventilating and prefabricating a cover plate; thirdly, hermetically prefabricating a cover plate, and fourthly, forming a porous PVC pipe; fifthly, soft drainage concealed pipe.
Detailed Description
The following description is provided for illustrative purposes, and other advantages and features of the present invention will become apparent to those skilled in the art from the following detailed description.
Please refer to fig. 1. It should be understood that in the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate the position or positional relationship based on the position or positional relationship shown in the drawings, or the position or positional relationship that the product of the present invention is usually placed when in use, and are only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the device or element to which the term refers must have a specific position, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance. The terms "horizontal", "vertical", "overhang" and the like do not imply that the components are required to be absolutely horizontal or overhang, but may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.
In the description of the present invention, it should be further noted that, unless otherwise explicitly stated or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly and may include, for example, a fixed connection, a detachable connection, an integral connection, a mechanical connection, an electrical connection, a direct connection, an indirect connection via an intermediate medium, and a connection between two elements. The specific meaning of the above terms in the present invention can be understood as a specific case by those skilled in the art.
As shown in figure 1, the utility model discloses a can dismantle membrane reactor for farmland drainage nitrogen and phosphorus removal, farmland drainage flow through the upper reaches irrigation canals and ditches and get into grit chamber 1, realize the desanding and handle and realize getting rid of most absorption state pollutant, effectively get rid of granule absorption state phosphorus. Then, large-volume suspended matters such as weeds in water are filtered through the coarse grating 2. For gentle rivers, reduce the velocity of water flow, reduce the impact to nitrogen phosphorus reaction unit, guarantee certain water conservancy dwell time, the utility model discloses buffer unit gravel wall 3 has been set up. Before entering the denitrification and dephosphorization reaction unit, the farmland drainage water is filtered by a fine grid 4 to remove fine impurities with the thickness of more than 4mm in the drainage water. Then, water drop and oxygenation are carried out by utilizing the water level difference of the front side and the rear side of the water retaining partition plate, the water enters the aerobic reaction tank 5 to strengthen the nitrification of ammonia nitrogen, then water carrying nitrate nitrogen in the main nitrogen form enters the anaerobic reaction zone 6 to carry out denitrification, and the treated tail water enters the porous PVC pipe at the bottom of the tank, and is discharged to a downstream ditch through a plurality of soft drainage concealed pipes.
Before the reactor is arranged, the installation position of the reactor, the grit chamber and the size of the aerobic-anaerobic reaction tank are designed according to the current situations of the form, the flow rate, the silt content, the pollutant characteristics and the like of a farmland drainage ditch. The reactor is installed up and down according to the water flow direction, a grit chamber is excavated at the initial position of the reactor by manual or mechanical means, and an original ditch is reformed to form a certain gradient behind the grit chamber. Grid filter unit and gravel wall carry out spacingly through steel nail and spacing and resist water impact, only need during the installation with thick, thin grid and gravel string bag insert downwards, dismantle upwards take out can, thick grid 1cm x 1cm, thin grid 4mm x 4mm, the gravel wall screen panel intussuseption diameter is at the stone of about 10 cm. Then, a drop dam with a certain height is constructed by using a water retaining partition plate, a reaction tank with a certain volume is excavated at the downstream of the drop dam, steel nails which are arranged at intervals of 2cm and are spaced by 0.5cm are arranged on the two inner side walls of the aerobic reaction tank for limiting, the two inner side walls are directly connected to a single threaded frame during film hanging, and then the threaded frame is vertically inserted downwards; when demoulding is needed, all the thread frames are directly drawn out upwards. Then, the anaerobic reaction tank net bag is filled with a plurality of wastes such as sawdust, oyster shells, pecan shells, furnace slag, steel slag and the like, and the wastes are optimally combined and reasonably mixed, and are supplemented with efficient microbial strains to form the composite medium filler. This layer is for convenient dismantlement design, puts down the string bag handle during daily use and is in the same place with ditch ridge gim peg lock joint, and the cooperation ditch bottom stuff limiting plate carries out the fixing clip jail to the device, when the filler saturation back, mentions with the handle and can carry out the dismouting operation fast. Digging a plurality of ditches for laying the soft drainage concealed pipes at the rear side of the reaction tank according to the laying positions of the soft drainage concealed pipes, laying a porous PVC pipe with a gauze at the bottom of the reaction tank, and connecting and fixing the PVC pipe with a water inlet of the soft drainage concealed pipe.
In order to ensure the nitrogen and phosphorus removal capability of the reactor and not influence the flood discharge capability of a ditch, when the flow of rain and sewage mixed sewage is large in rainy season, water flow can directly flow through a prefabricated cover plate on the upper surface of the reaction tank, and normal flood discharge is not influenced. And all modules of the reactor can be detached, and if the water level in the reactor is higher than the highest water level in extreme weather, a detaching procedure is started. The coarse and fine grids are cleaned while the filler is periodically replaced in the anaerobic reaction tank, and the intercepted impurities are removed to prevent the drainage ditch from being blocked; and the silt accumulated in the grit chamber is removed, and the pollution risk of the adsorbed pollutants is effectively reduced.
The reactor has no requirement on water inlet and has wide treatment range.
The treatment method and the membrane reactor are used for treating farmland drainage, water flow, temperature, treatment time and the like, and please explain in detail.
The hydraulic retention time is more than 24 hours, and the length of the aerobic-anaerobic pool is determined according to the maximum drainage water amount of farmland leakage, so as to meet the requirement of certain hydraulic retention time.
The ditch is used as a part of a natural ecological system and has a purification function, and the reduction rate of pollutants is 20-30%. The purification effect is obviously improved after the modification, and the concentration reduction rate of each pollutant is over 60 percent.
The concrete preparation method, the use method and the replacement method of the anaerobic tank filler are concretely explained.
The anaerobic tank filler is formed by optimally combining and reasonably mixing various wastes such as oyster shells, pecan shells, sawdust, furnace slag, steel slag and the like, the medium has wide sources and low price, and efficient microbial strains are supplemented to form the composite medium filler.
(6) The method of operation and the advantages of "removable" are specified.
In order to ensure the nitrogen and phosphorus removal capability of the reactor and not influence the flood discharge capability of the ditch, all modules of the reactor can be disassembled, and if the water level in the reactor is higher than the highest water level in extreme weather, a disassembling procedure is started. Grid filter unit and gravel wall carry on spacingly through steel nail and spacing strip and resist the rivers impact, only need during the installation with thick, thin grid and gravel string bag insert downwards, dismantle upwards take out can. Two inner side walls of the aerobic tank are provided with a group of steel nails with intervals of 0.5cm every 2cm, so that the threaded frame can be embedded into the steel nails for limiting, and 20 groups are provided. When the film is hung on the layer of device, the layer of device is directly connected to the single threaded frame, then the threaded frame is vertically inserted downwards, and the threaded frame is limited by the groove; when demoulding is needed, all the thread frames are directly drawn out upwards. The whole disassembly is not needed, the use is convenient, the structure is simple, the material consumption is less, and the manufacturing cost is low. The problems of difficult demoulding and unpowered aeration are effectively solved, the aerobic environment in the layer is ensured by good water and air permeability, and the degradation rate of organic matters is greatly improved. The anaerobic tank is designed to be convenient to disassemble because the filler is difficult to maintain the nitrogen and phosphorus removal effects for a long time. When the device is used daily, the handle is put down and buckled with the fixing bolts of the furrows and ridges together, and the device is fixedly clamped by matching with the batten limiting plate at the top of the furrows.
Agricultural non-point source pollution mainly occurs in rural areas, and the capital investment and management level of the areas in the aspect of water pollution control are limited, so the technical requirements of applying the agricultural non-point source pollution to the water pollution control are low-investment and easy-to-manage process methods. The invention provides a farmland drainage nitrogen and phosphorus removal treatment device which does not occupy land, has low capital investment, wide medium source, low price, no power aeration, no running cost, no human supervision, simple and convenient operation and management, convenient device disassembly and demoulding, high nitrogen and phosphorus removal efficiency, strong impact resistance and wide adaptability, and is particularly suitable for the non-point source pollution control of the agriculture in China.
The farmland drainage canal is used as a sink of upstream agricultural non-point source pollution and a source of pollutants in downstream water, and greatly influences the water quality of water bodies such as downstream lakes and rivers. The device is directly installed in a main channel of a centralized discharge point of a drainage ditch, does not occupy the land, carries out on-site interception and treatment on sewage, combines a physical/chemical method with a membrane method, and increases the removal of nitrogen and phosphorus nutritive salts by a ditch and pond system. The problems of large limitation of climate conditions and vegetation growth conditions, unstable purification effect, excessive farmland occupation, high capital construction cost and the like caused by other methods are effectively solved.
The invention is based on an anaerobic/aerobic (A/O for short) biological dephosphorization process.
Two inner side walls of the aerobic tank are provided with a group of steel nails with intervals of 0.5cm every 2cm, so that the threaded frame can be embedded into the steel nails for limiting, and 20 groups are provided. When the film is hung on the layer of device, the layer of device is directly connected to the single threaded frame, then the threaded frame is vertically inserted downwards, and the threaded frame is limited by the groove; when demoulding is needed, all the thread frames are directly pulled out upwards. The whole disassembly is not needed, the use is convenient, the structure is simple, the material consumption is less, and the manufacturing cost is low. Meanwhile, the threaded frames are arranged at intervals, so that the contact area and the contact time with air are greatly improved, the automatic reoxygenation performance of the equipment is improved, and the problem of unpowered aeration is solved.
The anaerobic tank utilizes a plurality of media to be mixed in different volume proportions, and is assisted by efficient microbial strains to form a composite media filler. Under the combined action of the filler and the microorganisms in the filler, the pollutants in the farmland drainage combine a physical/chemical method with a membrane method, so that the pollutants can be gradually adsorbed, degraded and converted, and finally the high-efficiency purification of the sewage is realized. The filler is difficult to maintain the denitrification and dephosphorization effects for a long time, so the layer device is of a detachable design. When the filler is saturated, the filler can be quickly disassembled and assembled to replace the filler. When the device is used, the lifting handle is put down and buckled with the fixing bolts of the furrows and ridges together, and the limiting plate made of the wood strips at the top of the furrows is matched to fix and firmly clamp the device so as to resist extreme weather.
Referring to fig. 1, in the denitrification and dephosphorization reactor, farmland drainage water flows through an upstream ditch and enters a grit chamber 1, so as to realize desanding treatment and remove most of adsorbed pollutants, and effectively remove granular adsorbed phosphorus. Then, large-volume suspended matters such as weeds in water are filtered through the coarse grating 2. In order to smooth the water flow, reduce the water flow speed, reduce the impact on the nitrogen and phosphorus reaction unit and ensure a certain hydraulic retention time, the invention is provided with a buffer unit gravel wall 3. Before entering the denitrification and dephosphorization reaction unit, the farmland drainage water is filtered by a fine grid 4 to remove fine impurities with the thickness of more than 4mm in the drainage water. Then, water drop and oxygenation are carried out by utilizing the water level difference of the front side and the rear side of the water retaining partition plate, the water enters the aerobic reaction tank 5 to strengthen the nitrification of ammonia nitrogen, then water carrying nitrate nitrogen in the main nitrogen form enters the anaerobic reaction zone 6 to carry out denitrification, and the treated tail water enters the porous PVC pipe at the bottom of the tank, and is discharged to a downstream ditch through a plurality of soft drainage concealed pipes.
All modules of the reactor can be detached, the highest water level of the reactor is 20-30cm lower than the top surface of the ditch, and if the water level in the reactor is higher than the highest water level in extreme weather, a detaching procedure is started to facilitate flood discharge.
The nitrogen and phosphorus nutrient salt in the farmland is discharged into surface water through a farmland drainage 'rough canal-rural canal-bucket canal-branch canal-main canal' system, so that a large amount of nitrogen and phosphorus enter a water body, and water environment pollution is caused. The drainage ditch is used as a transition zone between a farmland and a river system, is not only an initial collection land for farmland drainage, but also an output land for nitrogen and phosphorus nutritive salts of a downstream water body, and plays double roles of drainage and ecological interception. The device is directly installed in a main channel of a centralized discharge point of a drainage ditch to carry out on-site interception and treatment, and the removal of nitrogen and phosphorus nutritive salts by a ditch and pond system is increased. No land occupation, low capital construction cost and simple and convenient operation. Effectively solves the problems of large external limitation, unstable and non-lasting treatment effect and the like caused by other methods, and is suitable for the agricultural non-point source pollution control in China.
The phosphorus in the farmland drainage morphologically comprises granular phosphorus and soluble phosphorus. Wherein, the soluble phosphorus is a direct source of phosphorus required by the growth of algae in the water body, and the granular phosphorus is a potential source of phosphorus required by the continuous growth of the algae in the water body and is a main phosphorus form for water eutrophication. And excavating a grit chamber 1 with a depth of 0.5m and a 60-degree inclination angle at the initial position of the device by manual or mechanical means. The farmland drainage water passes through the grit chamber to realize desanding treatment, and the removal of most of the adsorption pollutants is realized, so that the granular adsorption phosphorus is effectively removed. And the accumulated silt in the grit chamber is removed while the filler is replaced, so that the pollution risk of the adsorbed pollutants is effectively reduced.
Suspended matters such as straws, weeds, leaves and the like are often mixed in farmland drainage, and in order to prevent the subsequent reaction units from being silted and blocked, a grating filtering unit is arranged before the farmland drainage enters the whole device. The farmland drainage flows through the coarse grating 2 to filter large-volume suspended matters such as weeds in water, and then the fine grating 4 filters fine impurities with the size of more than 4mm in the drainage water. The thick and thin grating is cleaned while the filler is periodically replaced in the anaerobic tank, and the intercepted impurities are removed to prevent the blockage of the drainage ditch.
In order to smooth the water flow, the water flow speed is reduced, the impact on the nitrogen and phosphorus reaction unit is reduced, and a certain hydraulic retention time is ensured. The invention is provided with the gravel wall 3 of the buffer unit, stones with the diameter of about 10cm are filled in the detachable net bag to be used as buffer substances, water flows through stone joints, the water flow is gentle after passing through the buffer unit, the flow speed is reduced, and the reaction and the adsorption of nitrogen and phosphorus substances in water are facilitated.
The sewage continuously passes through the aerobic zone 5 and the anaerobic zone 6 in the flowing process, and continuous aerobic and anaerobic zones are formed in the reactor, so that the coexistence of microbial communities with different functions is facilitated, and the treatment efficiency is high. The length of the aerobic-anaerobic pool is determined according to the leakage drainage water quantity of the farmland, so as to meet the requirement of certain hydraulic retention time.
The aerobic zone improves the automatic reoxygenation performance of the equipment through drop oxygenation, and further improves the pollutant removal capacity of the device. When the film is hung on the layer of device, the layer of device is directly connected to the single threaded frame, then the threaded frame is vertically inserted downwards, and the threaded frame is limited by steel nails; when demoulding is needed, all the thread frames are directly drawn out upwards. The whole disassembly is not needed, the use is convenient, the structure is simple, the material consumption is less, and the manufacturing cost is low. The problems of difficult demoulding and unpowered aeration are effectively solved, the aerobic environment in the layer is ensured by good water and air permeability, and the degradation rate of organic matters is greatly improved.
The anaerobic tank filler is formed by optimally combining and reasonably mixing various wastes such as oyster shells, pecan shells, sawdust, furnace slag, steel slag and the like, the medium has wide sources and low price, and efficient microbial strains are supplemented to form the composite medium filler. The rough surface of the medium has good adhesiveness to microorganisms and is beneficial to the growth of microbial communities, and the large specific surface area causes large surface energy and greatly enhances the physical adsorption capacity. Meanwhile, calcium carbonate in the oyster shell is continuously dissolved out in the anaerobic acidification process, so that phosphate in sewage can be removed in a chemical phosphorus removal mode. Oxidative decomposition of wood chips to produce CO 2 The nitrification of ammonia nitrogen is enhanced. Under the combined action of the filler and the microorganisms in the filler, the pollutants in the farmland drainage combine a physical/chemical method with a membrane method, so that the pollutants can be gradually adsorbed, degraded and converted, and finally the high-efficiency purification of the sewage is realized. The filler is difficult to maintain the nitrogen and phosphorus removal effects for a long time, so that the layer is designed to be convenient to disassemble. When the filler is saturated, the filler can be quickly disassembled and assembled, and the filler can be replaced regularly. The coarse and fine grids are cleaned while the filler is replaced, and the intercepted impurities are removed, so that a drainage ditch is prevented from being blocked; and the silt accumulated in the grit chamber is removed, and the pollution risk of the adsorbed pollutants is effectively reduced. When the device is used daily, the handle is put down and buckled with the fixing bolts of the furrows and ridges together, and the device is matched with the batten limiting plate at the top of the furrows and is arrangedThe fixing and clamping are performed.
Both biological denitrification and dephosphorization utilize anaerobic conditions. The biological nitrogen removal mechanism is that serial ammoniation, nitrification and denitrification are carried out in the anaerobic tank and the aerobic tank, so as to achieve the purpose of nitrogen removal. After the nitrification of ammonia nitrogen is completed by flowing through the aerobic tank 5, the enhanced denitrification reaction is carried out in the anaerobic reaction tank 6 in the anaerobic and carbon-rich environment. The aerobic-anaerobic and carbon-rich continuous habitat constructed by the reactor also plays a role in strengthening other denitrification processes such as completely autotrophic denitrification, anaerobic ammonium oxidation and the like. The denitrifying phosphorus removal is to utilize denitrifying phosphorus removal bacteria to absorb phosphate in sewage by using nitrate as an electron acceptor under the anaerobic condition so as to remove phosphorus under the anaerobic condition. The denitrifying phosphorus removal is used as a biological phosphorus removal mode in the anaerobic and aerobic process, and has a synergistic effect with the traditional biological phosphorus removal mode that phosphorus is absorbed by the phosphorus accumulating bacteria excessively under the aerobic condition, and the phosphorus removal effect of the anaerobic and aerobic process can be effectively improved by adopting a reasonable optimization design. The chemical phosphorus removal is Ca dissolved out by phosphate radical and oyster shell 2+ Form a more stable precipitate Ca 2 HPO 4 (OH) 2 With Ca 5 (PO 4 ) 3 OH is removed. Under the combined action of the filler and microorganisms in the filler, the phosphorus in the farmland drainage combines physical adsorption, chemical precipitation and a membrane method, and the soluble phosphorus is stably, efficiently and durably removed. The reactor realizes the removal of granular phosphorus and soluble phosphorus, and effectively cuts off the direct and potential sources of phosphorus required by water eutrophication.
A farmland drainage channel is selected in a farmland area in Qinhuang island city in Hebei province, and the construction method is modified, wherein the original channel has a trapezoidal section, the upper width is 135cm, the lower width is 80cm, the height is 95cm, and the length is 180 m. Annual water collection amount is about 2 ten thousand square meters, and the maximum flow is 0.15m E And/s, the water quality exceeds the standard limit value of the water area (class V) required by agricultural water areas and general landscapes in the environmental quality standard of surface water (GB 3838-2002). And a denitrification and dephosphorization membrane reactor is constructed in the middle section of the ditch, and the reactor is constructed in a flexible and detachable modular form. Excavating a 50cm grit chamber with a deep inclination angle of 60 degrees at an initial position, wherein the grit chamber is a thick grid of 1cm x 1cm and a thin grid of 4mmx 4mm, and stones with the diameter of about 10cm are filled in the gravel wall mesh enclosure. The total volume of the aerobic-anaerobic reaction tank is designed to be 120m according to the water cut-off time of 12h 3 . The aerobic reaction tank limits the threaded frame by two steel nails with an interval of 0.5cm, and 100 groups are formed every 2 cm. The anaerobic tank filler is formed by mixing sawdust and oyster shells. The reactor sludge is taken from an aeration tank of a municipal sewage treatment plant, and the operation of film hanging is selected in the period of agricultural cultivation. And (3) introducing water after 3 days of closed aeration at the initial stage of biofilm formation, stabilizing the removal rate of nitrogen and phosphorus for about 1 month, finishing the biofilm formation operation, and then entering a stable operation stage. Water quality monitoring is respectively carried out before and after modification, and the monitoring results are as follows.
Comparison of results of TN and TP removal rates before and after construction of the Table reactor
The above embodiments are merely illustrative of the principles and effects of the present invention, and are not to be construed as limiting the invention. Modifications and variations can be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which may be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.
Claims (6)
1. The utility model provides a can dismantle membrane reactor for farmland drainage nitrogen and phosphorus removal which characterized in that: comprises a channel allowing water to flow, and a grit chamber, a coarse grid, a gravel wall, a fine grid, an aerobic reaction tank and an anaerobic reaction zone which are sequentially arranged in the channel along the water flow direction; the gravel wall is formed by stacking gravels, and the gaps of the gravels allow water flow to pass through; a water retaining partition plate is arranged between the fine grid and the aerobic reaction tank; the anaerobic reaction area is characterized in that a drain pipe is laid at the bottom of the anaerobic reaction area, the drain pipe is provided with a plurality of water inlet holes, the drain pipe is communicated with a drain concealed pipe, and a drain outlet of the drain concealed pipe is communicated with a downstream ditch.
2. The removable membrane reactor for nitrogen and phosphorus removal in farmland drainage of claim 1, wherein: the gravel wall is composed of a gabion net cage and gravel filled in the gabion net cage.
3. The removable membrane reactor of claim 1, wherein the removable membrane reactor is configured to remove nitrogen and phosphorus from farmland drainage water: the distance between the bars of the thick grating is 1cm, and the distance between the bars of the thin grating is 4 mm.
4. The removable membrane reactor of claim 2, wherein the removable membrane reactor is configured to remove nitrogen and phosphorus from farmland drainage water: the water retaining partition plate is arranged along the tank wall of one side of the aerobic reaction tank facing the fine grid.
5. The removable membrane reactor of claim 1, wherein the removable membrane reactor is configured to remove nitrogen and phosphorus from farmland drainage water: the two inner side walls of the aerobic reaction tank are arranged at intervals of 1.5-2.5cm and are spaced by 0.4-0.6cm, the aerobic reaction tank is limited by steel nails, the aerobic reaction tank is directly connected to a single threaded frame during film hanging, and then the threaded frame is vertically inserted into the tank bottom; sawdust, oyster shells, pecan shells, furnace slag or steel slag as fillers are filled in the net bag of the anaerobic reaction tank.
6. The removable membrane reactor of claim 1, wherein the removable membrane reactor is configured to remove nitrogen and phosphorus from farmland drainage water: the drain pipe is made of PVC, and the drain pipe is coated with a gauze.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202220333031.9U CN217459136U (en) | 2022-02-18 | 2022-02-18 | A can dismantle membrane reactor for farmland drainage nitrogen and phosphorus removal |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202220333031.9U CN217459136U (en) | 2022-02-18 | 2022-02-18 | A can dismantle membrane reactor for farmland drainage nitrogen and phosphorus removal |
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| CN217459136U true CN217459136U (en) | 2022-09-20 |
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