CN210261261U - Efficient nitrogen and phosphorus removal system for treating aquaculture tail water - Google Patents
Efficient nitrogen and phosphorus removal system for treating aquaculture tail water Download PDFInfo
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- CN210261261U CN210261261U CN201920781079.4U CN201920781079U CN210261261U CN 210261261 U CN210261261 U CN 210261261U CN 201920781079 U CN201920781079 U CN 201920781079U CN 210261261 U CN210261261 U CN 210261261U
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Abstract
The utility model provides a handle high-efficient nitrogen and phosphorus removal system of aquaculture tail water, the system includes tail water treatment biological filter, suspended filler, direct current negative and positive electrode array combination, electronic agitating unit and carbon source supplement unit, suspended filler sets up in tail water treatment biological filter, direct current negative and positive electrode array combination sets up the upper portion of tail water treatment biological filter, electronic agitating unit sets up the lower part of tail water treatment biological filter, the bottom of tail water treatment biological filter is provided with the sludge bucket, electronic agitating unit sets up above the sludge bucket, carbon source supplement unit is connected to tail water treatment biological filter through the pipeline; the volume ratio of the suspended filler to the water body in the tail water treatment biological filter is 20-50%. The utility model has the advantages of high nitrogen and phosphorus removal treatment efficiency, small occupied area, no need of air pump oxygenation, 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 a handle high-efficient nitrogen and phosphorus removal system of aquaculture tail water.
[ background of the invention ]
China is a big aquaculture country, and the aquaculture yield accounts for about 68% of the world aquaculture yield, wherein the pond aquaculture yield accounts for about 45%. However, the pond culture tail water and the industrial culture tail water are both discharged directly without being treated basically, and because the culture tail water generally contains higher nitrogen and phosphorus, eutrophication pollution to the surrounding water area environment is caused to different degrees. 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), the surface water environment quality standard of the state (GB3838-2002), the tail water discharge requirement of seawater culture (SC/T9103) and the like. 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.
[ Utility model ] content
The to-be-solved technical problem of the utility model lies in providing a handle high-efficient nitrogen and phosphorus removal system of aquaculture tail water, it has nitrogen and phosphorus removal treatment effeciency height, area are little, need not air pump oxygenation, energy-conservation, with low costs, no secondary pollution, advantage such as the management is simple and convenient.
The utility model discloses a realize like this:
a high-efficiency nitrogen and phosphorus removal system for treating aquaculture tail water comprises a tail water treatment biological filter, 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 tail water treatment biological filter, the direct-current positive and negative electrode array combination is arranged at the upper part of the tail water treatment biological filter, the electric stirring device is arranged at the lower part of the tail water treatment biological filter, a sludge hopper is arranged at the bottom of the tail water treatment biological filter, the electric stirring device is arranged above the sludge hopper, and the carbon source supplementing device is connected to the tail water treatment biological filter through a pipeline;
the volume ratio of the suspended filler to the water body in the tail water treatment 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.
Further, the suspension filler is made of high-density polyethylene, and the specific surface area is more than 500m2/m3。
Further, the distance between the adjacent electrodes of the direct current positive and negative electrode array combination is 2-30 cm.
Furthermore, the tail water treatment biological filter is formed by combining 2-3 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.
The utility model has the advantages of as follows:
the utility model discloses mainly through series physics, chemistry and the microbial action that produces in breeding the tail water treatment pond, synthesize iron cation phosphate precipitation reaction, iron cation hydrate and polymer to the flocculation and precipitation effect of phosphorus and other particulate matters, nitration reaction and denitrification reaction etc. reach and last, stabilize, 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. The resulting small amount of precipitated sludge can be removed from the system by periodic blowdown.
[ 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 view of a high-efficiency denitrification and dephosphorization system for treating aquaculture tail water.
[ detailed description ] embodiments
Referring to fig. 1, the utility model relates to a handle high-efficient nitrogen and phosphorus removal system of aquaculture tail water, the system includes tail water treatment biofilter 1, suspension filler 2, direct current negative and positive electrode array combination 3, electric stirring device 4 and carbon source supplement unit, suspension filler 2 sets up in tail water treatment biofilter 1, direct current negative and positive electrode array combination 3 sets up the upper portion of tail water treatment biofilter 1, electric stirring device 4 sets up the lower part of tail water treatment biofilter 1, the bottom of tail water treatment biofilter 1 is provided with sludge bucket 5, electric stirring device 4 sets up above sludge bucket 5, carbon source supplement unit is connected to tail water treatment biofilter 1 through pipeline 6;
the volume ratio of the suspended filler 2 to the water body in the biological filter 1 for tail water treatment is 20-50%, and the density of the suspended filler 2 is 0.92-0.98 g/cm3(ii) a In the direct current cathode-anode array combination 3, the anode is iron, and the cathode is iron, carbon or copper; the rotating speed of the electric stirring device 4 is 100-300 r/min.
The suspension filler 2 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 3 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 tail water treatment biological filter 1 is formed by connecting 2-3 filter bodies in series, and a direct current positive and negative electrode array combination 3 can be arranged on part or all of the filter bodies.
The working principle of the utility model is as follows:
(1) due to the action of the DC electric field of the DC positive and negative electrode array combination 3, iron (anode) generates a large amount of iron cations, and a large amount of Fe is generated2+And Fe3+Precipitating with phosphate in the tail water to form granular and insoluble matterThe bottom of the material filter 1 is arranged in a sludge hopper 5; 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 sludge hopper 5 at the bottom of the tail water treatment biological filter 1.
(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 2, 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, hydrogen generated by electrolyzing water can stimulate the growth and metabolism of autotrophic denitrifying bacteria attached to the surface of the suspended filler 2, meanwhile, redox substances generated by electrolysis provide a suitable environment for the growth and propagation of microorganisms, an inorganic carbon source and an electron donor are provided for the denitrification process of the autotrophic denitrifying bacteria, and the autotrophic denitrification process is further promoted, so that the removal of total nitrogen is improved.
(5) The density (0.92-0.98 g/cm) of the suspended filler 2 is utilized3) Close to fresh water, a uniform suspended state is easily formed in the water body of the tail water treatment biofilter, meanwhile, a fluidized state can be formed under the continuous slow stirring of the electric stirring device 4 and the flowing of water flow, so that a biological film attached to the suspended filler 2 is easily in continuous flowing contact with pollutants in the aquaculture wastewater, the speed of nitration reaction and denitrification reaction is favorably improved, the suspended filler 2 is favorably continuously rubbed with the water flow and flows through the surface of an electrode, 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 2, 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) Because the organic carbon concentration in the culture tail water is generally low, the organic carbon is quickly consumed, and in order to promote the heterotrophic denitrification reaction in the pond, a supplementary carbon source such as brown sugar and the like is added. 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 6 so as to continuously and quickly 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 system and the method, the culture tail water denitrification and dephosphorization treatment pool is constructed, deep treatment of nitrogen, phosphorus and organic matters is carried out on the tail water of pond culture and industrial culture of eels, and the result data is as follows:
remarking: the inlet water refers to the culture tail water, and the outlet water refers to the discharge water treated by the treatment tank.
In conclusion, the maximum removal rate of ammonia nitrogen in the culture tail water treated by the utility model is 99.4%; the highest removal rate of total nitrogen is: 96.6 percent, and the highest removal rate of the total phosphorus is 96 percent.
In a word, the utility model discloses mainly through series physics, chemistry and the microbial action that produces in breeding the tail water treatment pond, synthesize iron cation phosphate precipitation reaction, iron cation hydrate and polymer to the flocculation and precipitation effect, nitration reaction and the denitrification reaction etc. of phosphorus and other particulate matters, 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 sewage treatment efficiency 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 tail water of breeding is through using the utility model discloses the effluent after the system is handled, its ammonia nitrogen, total phosphorus and permanganate index etc. have all reached III class water quality standards in the national "surface water environment quality standard" (GB3838-2002), and some have even reached II class water quality standards. 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 (4)
1. The utility model provides a handle high-efficient nitrogen and phosphorus removal system of aquaculture tail water which characterized in that: the system comprises a tail water treatment biological filter, 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 tail water treatment biological filter, the direct-current positive and negative electrode array combination is arranged at the upper part of the tail water treatment biological filter, the electric stirring device is arranged at the lower part of the tail water treatment biological filter, a sludge hopper is arranged at the bottom of the tail water treatment biological filter, the electric stirring device is arranged above the sludge hopper, and the carbon source supplementing device is connected to the tail water treatment biological filter through a pipeline;
the volume ratio of the suspended filler to the water body in the tail water treatment 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. The system of claim 1, wherein the system comprises: the suspension filler is made of high-density polyethylene and has a specific surface area of more than 500m2/m3。
3. The system of claim 1, wherein the system comprises: the distance between the adjacent electrodes of the direct current positive and negative electrode array combination is 2-30 cm.
4. The system of claim 1, wherein the system comprises: the tail water treatment biological filter is formed by connecting 2-3 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.
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| CN110240257A (en) * | 2019-05-28 | 2019-09-17 | 集美大学 | A kind of high-efficient denitrification and dephosphorization system handling aquaculture tail water |
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