CN210261455U - Intensive modular combined aquaculture tail water treatment system - Google Patents
Intensive modular combined aquaculture tail water treatment system Download PDFInfo
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- CN210261455U CN210261455U CN201920781130.1U CN201920781130U CN210261455U CN 210261455 U CN210261455 U CN 210261455U CN 201920781130 U CN201920781130 U CN 201920781130U CN 210261455 U CN210261455 U CN 210261455U
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Abstract
The utility model provides an intensive modularized combined aquaculture tail water treatment system, which comprises a sewage collection tank, a physical filtering device, an electrode-suspended filler coupling biofilter treatment unit and an air pump micropore oxygenation tank which are connected in sequence, wherein the sewage collection tank, the physical filtering device, the electrode-suspended filler coupling biofilter treatment unit and the air pump micropore oxygenation tank are all connected with a sludge concentration dehydration device; the suspended filler in the electrode-suspended filler coupling biological filter treatment unit is arranged in a biological filter, the direct-current positive and negative electrode array combination is arranged at the upper part of the biological filter, the electric stirring device is arranged at the lower part of the biological filter, the bottom of the biological filter is provided with a sludge hopper, the electric stirring device is arranged above the sludge hopper, and the carbon source supplementing device is connected to the biological filter through a pipeline. The utility model has the advantages of high nitrogen and phosphorus removal treatment efficiency, small occupied area, energy conservation, low cost, no secondary pollution, simple and convenient management and the like.
Description
[ technical field ] A method for producing a semiconductor device
The utility model relates to an intensive modularization combination aquaculture tail water processing system.
[ background of the invention ]
China is a big country for aquaculture, the aquaculture yield accounts for about 68% of the world aquaculture yield, the pond aquaculture yield accounts for about 45%, and the total area and the yield of fresh water pond aquaculture exceed those of seawater pond aquaculture. The tail water of the current pond culture and the tail water of the factory culture are basically untreatedDirectly discharged, and generally contains higher-concentration ammonia nitrogen, total phosphorus, permanganate index, Chemical Oxygen Demand (COD) and five-day Biochemical Oxygen Demand (BOD) in the culture tail water5Fecal coliform bacteria and suspended matters easily cause eutrophication pollution to the surrounding water area environment in different degrees. On the other hand, the heavy metals in the aquaculture source water meet the requirement of fishery aquaculture water, and the excessive heavy metals are not added basically during aquaculture, so that the concentration of the heavy metals in the aquaculture tail water can generally meet the requirement of environmental protection. In order to protect the ecological environment of a water area, the treatment of the culture tail water is required to be carried out by all levels of governments or society, so that the water quality of the discharged water can meet the relevant national environmental protection requirements, such as the III-class water quality standard in the tail water discharge requirement of freshwater culture (SC/T9101) and the quality standard of surface water environment in the state (GB 3838-2002). The current pond culture tail water or industrial culture tail water treatment technology mainly adopts an artificial wetland technology, an ecological pond technology and a comprehensive application chemical auxiliary phosphorus removal technology, such as aluminum chloride (PAC) auxiliary phosphorus removal and the like, and has the problems of large occupied area, low phosphorus and nitrogen removal treatment efficiency, higher operation cost, poor treatment effect stability, secondary pollution possibly caused by long-term use of a large amount of chemical agents and the like although a certain phosphorus and nitrogen removal effect is achieved. Many aquaculture farms are limited by land area and have high treatment cost, and tail water discharge treatment cannot be carried out, so that the environment of surrounding water areas is polluted or production is forcibly stopped due to unqualified environmental protection.
In addition, during the electrolysis of the existing electrode, the surface of the anode iron is easily passivated by a compact covering layer formed by oxides, so that the electrolysis cannot be normally carried out, and the anode iron needs to be regularly cleaned or replaced, which causes the production to be regularly interrupted, influences the working efficiency, and simultaneously generates new waste water and increases the cost.
[ summary of the invention ]
The to-be-solved technical problem of the utility model lies in providing an intensive modularization combination aquaculture tail water processing system, and it has advantages such as nitrogen and phosphorus removal treatment effeciency height, area are little, energy-conservation, with low costs, no secondary pollution, management are simple and convenient.
The utility model discloses a realize like this:
an intensive modular combined aquaculture tail water treatment system comprises a sewage collecting tank, a physical filtering device, an electrode-suspended filler coupled biofilter treatment unit, an air pump microporous oxygenation tank and a sludge concentration and dehydration device; the sewage collecting tank, the physical filtering device, the electrode-suspended filler coupled biological filter treatment unit and the air pump micropore oxygenation tank are all connected with the sludge concentration and dehydration device;
the electrode-suspended filler coupled biofilter treatment unit comprises a biofilter, suspended fillers, a direct-current positive and negative electrode array combination, an electric stirring device and a carbon source supplementing device, wherein the suspended fillers are arranged in the biofilter, the direct-current positive and negative electrode array combination is arranged at the upper part of the biofilter, the electric stirring device is arranged at the lower part of the biofilter, a sludge hopper is arranged at the bottom of the biofilter, the electric stirring device is arranged above the sludge hopper, and the carbon source supplementing device is connected to the biofilter through a pipeline; in the direct current cathode and anode array combination, the anode is iron, and the cathode is iron, carbon or copper.
Further, the suspension filler is made of high-density polyethylene, and the specific surface area is more than 500m2/m3。
Further, the distance between adjacent electrodes of the direct current positive and negative electrode array combination is 2-30cm, and the operating voltage and current are respectively: the direct current voltage is 12-36V, and the micro-current density is 0.1-1.0 mA/cm2。
Furthermore, the biological filter is formed by combining more than 2 filter bodies in series, and a direct current positive and negative electrode array combination can be arranged on part or all of the filter bodies.
Further, the physical filtering device is an automatic backflushing screen filter, a micro-filter or a sieve bend.
Furthermore, the bottom of the air pump micropore aeration tank is provided with an aeration micropore aeration pipe.
The utility model has the advantages of as follows:
the utility model discloses mainly through the series physics that produces in the biological filter, chemistry and microbial action, synthesize iron cation phosphate precipitation reaction, iron cation hydrate and polymer to the flocculation and precipitation effect, nitration and the denitrification reaction etc. of phosphorus and other particulate matters, reach continuously, stable, efficient dephosphorization denitrogenation, degradation organic matter and reduce suspended solid concentration effect. Has the advantages of simple structure, less sludge production, no secondary pollution and the like. After the culture tail water is treated by the system, nitrogen, phosphorus, permanganate index, Chemical Oxygen Demand (COD) and five-day Biochemical Oxygen Demand (BOD) in the discharged water5The indexes of factors such as pH, dissolved oxygen, fecal coliform bacteria, suspended matters, sulfides, volatile phenol and the like can all meet the III-class water quality standard in the tail water discharge requirement of freshwater aquaculture (SC/T9101) or the national quality standard of surface water environment (GB 3838-2002).
[ description of the drawings ]
The invention will be further described with reference to the following examples with reference to the accompanying drawings.
Fig. 1 is a schematic structural diagram of the present invention.
FIG. 2 is a schematic diagram of the structure of the middle electrode-suspended filler coupled biofilter treatment unit and the air pump microporous aeration tank.
[ detailed description ] embodiments
Referring to fig. 1-2, the utility model relates to an intensive modular combined aquaculture tail water treatment system, which comprises a sewage collecting tank 1, a physical filtering device 2, an electrode-suspended filler coupling biofilter treatment unit 3, an air pump micropore oxygenation tank 4 and a sludge concentration dehydration device 5; the sewage collecting tank 1 is connected with a physical filtering device 2, the physical filtering device 2 is connected with an electrode-suspended filler coupled biological filter treatment unit 3, the electrode-suspended filler coupled biological filter treatment unit 3 is arranged adjacent to an air pump micropore oxygenation tank 4, and the sewage collecting tank 1, the physical filtering device 2, the electrode-suspended filler coupled biological filter treatment unit 3 and the air pump micropore oxygenation tank 4 are all connected with a sludge concentration and dehydration device 5;
the electrode-suspended filler coupled biofilter treatment unit 3 comprises a biofilter 31, suspended fillers 32, a direct current positive and negative electrode array combination 33, an electric stirring device 34 and a carbon source supplementing device 35, wherein the suspended fillers 32 are arranged in the biofilter 31, the direct current positive and negative electrode array combination 33 is arranged at the upper part of the biofilter 31, the electric stirring device 34 is arranged at the lower part of the biofilter 31, a sludge hopper 36 is arranged at the bottom of the biofilter 31, the electric stirring device 34 is arranged above the sludge hopper 36, and the carbon source supplementing device 35 is connected to the biofilter 31 through a pipeline;
the volume ratio of the suspended filler 32 to the water body in the biological filter 31 is 20-50%, and the density of the suspended filler 32 is 0.92-0.98 g/cm3(ii) a In the direct current cathode-anode array combination 33, the anode is iron, and the cathode is iron, carbon or copper; the rotating speed of the electric stirring device 34 is 100-300 r/min.
The suspension filler 32 is made of high-density polyethylene and has a specific surface area of more than 500m2/m3。
The distance between the adjacent electrodes of the direct current positive and negative electrode array combination 33 is 2-30cm, and the operating voltage and current are respectively as follows: the direct current voltage is 12-36V, and the micro-current density is 0.1-1.0 mA/cm2。
The biological filter 31 is formed by combining more than 2 filter bodies in series, and a direct current positive and negative electrode array combination 33 can be arranged on part or all of the filter bodies.
The physical filtering device 2 is an automatic backflushing screen filter, a micro-filter or a curved screen.
The bottom of the air pump micropore aeration tank 4 is provided with an aeration micropore aeration pipe 41.
The utility model discloses the working process is as follows: after the culture tail water enters a sewage collecting tank 1, the culture tail water is extracted by a water pump and enters a physical filtering device 2, the filtered water enters an electrode-suspended filler coupling biofilter treatment unit 3, and backwash water (less than or equal to 1.5%) containing large granular substances such as residual bait, excrement and the like enters a sludge concentration and dehydration device 5; forming sludge cake organic fertilizer in the sludge concentration and dehydration device 5, transporting the sludge out of the system, and returning the concentrated and dehydrated water to the sewage collection tank 1; in the electrode-suspended filler coupled biological filter treatment unit 3, the bottom of the biological filter 31 is provided with a sludge hopper 36 which can discharge sewage periodically, and the sludge water (less than or equal to 3 percent) is discharged into a sludge concentration dehydration device 5; the anoxic water treated by the electrode-suspended filler coupling biological filter treatment unit 3 flows into the air pump micropore oxygenation tank 4 for appropriate oxygenation, and then is discharged out of the system, wherein the air pump micropore oxygenation tank 4 is also provided with a sludge hopper which can discharge sewage periodically, and the sludge water (less than or equal to 0.5%) is discharged into a sludge concentration dehydration device 5.
The working principle of each device is as follows:
1. the sewage collecting pool 1 is mainly used for collecting culture tail water discharged from a culture pool, more than 2 submersible pumps (1 of which is standby) are arranged in the pool, and the pool water is extracted to the physical filtering device 2.
2. The physical filtering device 2 is a physical filtering device such as an automatic backflushing screen filter, a micro-filter or a sieve bend and the like, separates large granular substances in water, automatically leads the backflushing water (less than or equal to 1.5 percent) containing large granular substances such as residual bait, excrement and the like to enter the sludge dehydration and concentration device 5, and leads the water filtered by the screen to enter the electrode-suspended filler coupling biological filter processing unit 3.
3. The sludge concentration and dehydration device 5 adopts a sludge filter press device or is provided with a water filtering layer drying pool facility, sludge after concentration and dehydration is formed into a sludge cake (organic fertilizer) and is transported out of the system, and the filtered water returns to the sewage collecting pool 1.
4. The air pump micropore aeration tank 4 is adjacent to the biological filter 31 of the electrode-suspended filler coupling biological filter processing unit 3, the anoxic water processed by the electrode-suspended filler coupling biological filter processing unit 3 flows into the air pump micropore aeration tank 4, an aeration micropore aeration pipe 41 is arranged at the bottom layer of the water body of the air pump micropore aeration tank 4, the aeration micropore aeration pipe 41 is connected with an air pump outside the tank through a pipeline, and air is input into the aeration micropore aeration pipe to oxygenate the tank water.
5. The working principle of the electrode-suspended filler coupled biofilter treatment unit 3 is as follows:
(1) due to the action of the DC electric field of the DC positive and negative electrode array combination 33, iron (anode) generates a large amount of iron cations, and a large amount of Fe is generated2+And Fe3+Carrying out precipitation reaction with phosphate in the culture tail water to form granular and insoluble substances which are deposited in a bottom sludge hopper 36 of the biological filter 31; meanwhile, iron cations are subjected to a series of hydrolytic polymerization reactions, and Fe2+And Fe3+And their hydrates such as ferric hydroxide have strong flocculation and precipitation effects on phosphorus, and can also generate polymer with adsorption coagulation effect, such as part of Fe3+Produced by hydrolysis, e.g. [ Fe ]2(OH)2]4+、[Fe3(OH)4]5+、[Fe5(OH)9]6+The polynuclear hydroxyl complex can play the role of a flocculating agent, can be subjected to the sedimentation with suspended substances (containing suspended phosphorus, including biological phosphorus and indissolvable phosphate particles), granular substances, electrolytes and the like in the culture tail water, and is settled in a bottom sludge hopper 36 of the biological filter 31.
(2) Dissolved oxygen contained in the culture tail water and oxygen generated by electrolyzing water by the iron anode can provide dissolved oxygen required for nitrification reaction for a large amount of nitrosation and nitrifying bacteria in a biological membrane attached to the suspended filler 32, so that ammonia nitrogen is converted into nitrite nitrogen and nitrate nitrogen, and an air pump is not needed for increasing oxygen; meanwhile, due to the rapid consumption of dissolved oxygen, the water body in the pool, particularly the lower layer of the pool water, rapidly forms an anoxic or anaerobic water environment to promote the denitrification reaction.
(3) Heterotrophic denitrifying bacteria in the pond utilize an organic carbon source in culture water as an electron donor to perform denitrification reaction, so that nitrate nitrogen is finally generated through denitrification reaction to overflow the system and is removed.
(4) The hydrogen generated by cathode electrolysis of water can be used as an electron donor of hydrogen autotrophic denitrifying bacteria, and CO in tail water2Can provide inorganic carbon source for the autotrophic bacteria to generate autotrophic denitrification reaction, so that nitrate nitrogen is generated through denitrification reaction to generate nitrogen gas which overflows the system and is removed.
In addition, the hydrogen generated by the electrolyzed water can stimulate the growth and metabolism of autotrophic denitrifying bacteria attached to the surface of the suspended filler 32, and meanwhile, redox substances generated by electrolysis provide a suitable environment for the growth and propagation of microorganisms, provide an inorganic carbon source and an electron donor for the denitrification process of the autotrophic denitrifying bacteria, and further promote the autotrophic denitrification process, thereby improving the removal of total nitrogen.
(5) The density (0.92-0.98 g/cm) of the suspended filler 32 is utilized3) Close to fresh water, a uniform suspended state is easily formed in the water body of the biological filter, and simultaneously, a fluidized state can be formed under the continuous slow stirring of the electric stirring device 34 and the flowing of water flow, so that the biological membrane attached to the suspended filler 32 is easily in continuous flowing contact with pollutants in the culture wastewater, the speed of nitration reaction and denitrification reaction is improved, the continuous friction and the flowing through of the suspended filler 32 and the water flow on the surface of an electrode are facilitated, and the density is 0.92-0.98 g/cm under the same volume3The friction force of the suspended filler is larger, the surface of the (anode) iron can be better removed by the oxide, the surface of the (anode) iron is prevented from being passivated by the oxide which forms a compact covering layer, the normal operation of electrode electrolytic reaction is influenced, and the passivation problem of the (anode) iron is effectively solved.
(6) The micro-current can strengthen the microorganisms such as bacteria and the like in the biological membrane on the suspended filler 32, can change the permeability of the bacterial cell membrane, is beneficial to the enzyme in the bacterial cell membrane to carry out a series of enzymatic reactions in the wastewater through the cell membrane, increases the contact between the enzyme in the cell membrane and a reaction substrate in the water, and further enhances the effect of degrading nitrogen and phosphorus in the aquaculture wastewater to a certain extent; in addition, the micro-current can also directly stimulate and strengthen the activity of extracellular enzymes secreted by certain bacteria and promote the degradation of nitrogen, phosphorus and other pollutants in water.
(7) As the concentration of organic carbon in the culture tail water is generally low and is consumed quickly, in order to promote the heterotrophic denitrification reaction in the pond, the carbon source supplementing device 35 is used for supplementing carbon sources such as brown sugar and the like. An automatic feeding device can be configured, a certain amount of brown sugar is added into the solution barrel at regular intervals, the stirring machine is started to dissolve, and the brown sugar is automatically fed into the tank through a metering pump according to a certain amount through a pipeline so as to continuously and rapidly promote the heterotrophic denitrification reaction.
The reaction rate of heterotrophic denitrification is several times (about 7 times) faster than that of autotrophic denitrification reaction, and meanwhile, the population growth and propagation speed of heterotrophic denitrifying bacteria are higher than that of autotrophic denitrifying bacteria. Therefore, organic carbon sources such as brown sugar and the like are added to supplement the nitrogen, so that denitrification can be obviously accelerated.
The TP removal rate and the TN removal rate have a certain positive correlation, namely when the TN removal effect is good, the TP also has a good removal effect. The utility model discloses in, the iron electrode can provide the electron that the denitrification reaction needs, has certain enhancement denitrification effect, promotes NO3 -The mass concentration of-N and TN is reduced, which is beneficial to promoting the biological phosphorus removal of phosphorus-accumulating bacteria in the filler biomembrane and the water body and synergistically promoting the removal of TP. Furthermore, the utility model discloses a supplementary carbon source high efficiency promotes denitrification device has greatly promoted going on of denitrification, promotes NO3 -Decrease in the mass concentration of N and TN. The synergy promotes sustained deep removal of TP concentration. Therefore, the utility model discloses an electrode-suspension filler coupling technique promotes the integrated integration of denitrification technique with supplementary carbon source high efficiency and fuses integratively, in coordination mutually, has promoted nitrogen and phosphorus removal efficiency and clearance.
The present invention will be further described with reference to the following specific examples.
By applying the method and the device, an intensive modular combined aquaculture tail water standard discharge treatment system is constructed, eel pond culture and industrial culture tail water are treated, the quality of the treated discharge water meets the requirements, and the monitoring result data is as follows:
remarking: the water inlet refers to culture tail water, and the water outlet refers to discharge water treated by the treatment system.
In a word, the utility model discloses mainly through the series physics that produce in the biological filter, chemistry and microbiological action, synthesize iron cation phosphate precipitation reaction, iron cation hydrate and polymer to the flocculation and precipitation effect, nitration and the denitrification of phosphorus and other particulate matters etc. reach and last, stabilize, efficient dephosphorization denitrogenation, degradation organic matter and reduce suspended solid concentration effect. And the passivation caused by oxide attached to the surface of the anode iron can be avoided, the normal operation of electrode electrolysis reaction is ensured, and the treatment efficiency of the aquaculture sewage is improved. Has the advantages of simple structure, less sludge production, no secondary pollution and the like. The resulting small amount of precipitated sludge can be removed from the system by periodic blowdown.
And the culture tail water is treated by the treatment system of the utility model, the ammonia nitrogen, the total phosphorus, the permanganate index, the chemical oxygen demand COD and the five-day biochemical oxygen demand BOD of the wastewater are all treated5pH, dissolved oxygen, fecal coliform bacteria, suspended matters, sulfides, volatile phenol and the like all reach the III type water quality standard in the national 'quality standard of surface water environment' (GB3838-2002), and even reach the II type water quality standard in some cases. And also meets the first-level discharge standard specified in the requirements for tail water discharge of freshwater aquaculture (SC/T9101).
Although specific embodiments of the present invention have been described, it will be understood by those skilled in the art that the specific embodiments described are illustrative only and are not limiting upon the scope of the invention, and that equivalent modifications and variations can be made by those skilled in the art without departing from the spirit of the invention, which is to be limited only by the claims appended hereto.
Claims (6)
1. An intensive modular combined aquaculture tail water treatment system is characterized in that: the tail water treatment system comprises a sewage collecting tank, a physical filtering device, an electrode-suspended filler coupling biological filter treatment unit, an air pump microporous oxygenation tank and a sludge concentration and dehydration device; the sewage collecting tank, the physical filtering device, the electrode-suspended filler coupled biological filter treatment unit and the air pump micropore oxygenation tank are all connected with the sludge concentration and dehydration device;
the electrode-suspended filler coupled biofilter treatment unit comprises a biofilter, suspended fillers, a direct-current positive and negative electrode array combination, an electric stirring device and a carbon source supplementing device, wherein the suspended fillers are arranged in the biofilter, the direct-current positive and negative electrode array combination is arranged at the upper part of the biofilter, the electric stirring device is arranged at the lower part of the biofilter, a sludge hopper is arranged at the bottom of the biofilter, the electric stirring device is arranged above the sludge hopper, and the carbon source supplementing device is connected to the biofilter through a pipeline; the volume ratio of the suspended filler to the water body in the biological filter is 20-50%; in the direct current cathode and anode array combination, the anode is iron, and the cathode is iron, carbon or copper.
2. An intensive modular combined aquaculture tail water treatment system according to claim 1, characterized in that: the suspension filler is made of high-density polyethylene and has a specific surface area of more than 500m2/m3。
3. An intensive modular combined aquaculture tail water treatment system according to claim 1, characterized in that: the distance between the adjacent electrodes of the direct current positive and negative electrode array combination is 2-30 cm.
4. An intensive modular combined aquaculture tail water treatment system according to claim 1, characterized in that: the biological filter is formed by combining more than 2 filter bodies in series, and a part or all of the filter bodies can be combined by arranging a direct current positive and negative electrode array.
5. An intensive modular combined aquaculture tail water treatment system according to claim 1, characterized in that: the physical filtering device is an automatic back-flushing screen filter, a micro-filter or a curved screen.
6. An intensive modular combined aquaculture tail water treatment system according to claim 1, characterized in that: and an aeration micropore aeration pipe is arranged at the bottom of the air pump micropore aeration tank.
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| CN110240354A (en) * | 2019-05-28 | 2019-09-17 | 集美大学 | A kind of intensive style modular combination aquaculture tail water treatment system |
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