CN112655643A - Industrial prawn culture wastewater treatment method - Google Patents
Industrial prawn culture wastewater treatment method Download PDFInfo
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- CN112655643A CN112655643A CN202110066549.0A CN202110066549A CN112655643A CN 112655643 A CN112655643 A CN 112655643A CN 202110066549 A CN202110066549 A CN 202110066549A CN 112655643 A CN112655643 A CN 112655643A
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Abstract
The invention relates to the field of aquatic waste treatment, and discloses a treatment method of industrial prawn culture wastewater, which comprises 11 steps: (1) building a wastewater treatment facility outdoors; (2) adding mud silt of the mud flat into the workshop wastewater; (3) removing organic particles in the wastewater in an adsorption tank; (4) adding dissolved oxygen to the wastewater in the aeration tank; (5) recovering the sediment in a sediment recovery tank; (6) oxidizing and decomposing the sediment in a sunning ground; (7) culturing phytoplankton in a biological purification pond by using nutrient salt contained in the wastewater; (8) arranging an oyster cultivation cage in a biological purification pond; (9) filtering and feeding phytoplankton and suspended particles by using oysters in a biological purification pond; (10) constructing an ecological food chain in a biological purification pond; (11) and (5) recycling the wastewater. The invention successfully realizes the removal of organic particles in water, the increase of dissolved oxygen in water, the consumption of nutrient salt in water, the construction of a pond food chain and the recycling of purified water, and has obvious environmental protection and economic benefits.
Description
Technical Field
The invention relates to the field of aquatic waste treatment, in particular to a method for treating industrial prawn culture wastewater.
Background
The industrial aquaculture of the penaeus vannamei boone is a aquaculture mode for the development of coastal fishery in China in recent years, the penaeus vannamei boone is bred out of season, sold on the market before spring festival, high in price and greatly beneficial, and has important significance for solving the production and life of coastal fishermen and maintaining the economic development of fishery. However, the industrial shrimp culture does have some problems which cannot be ignored.
Because the density of industrially cultured prawns is high, the culture water temperature is high, the input products in the culture pond are more, the produced residual baits and other wastes are more, the wastewater discharged in the process of culturing the prawns contains a large amount of organic particles, the content of inorganic salts such as ammonia nitrogen and the like is also high, and the content of dissolved oxygen is low. In the industrial prawn culture process, part of the bait is not eaten by the prawns in time or the bait is thrown too much to generate residual bait, so that harmful substances can be generated, the water environment of a prawn pond is influenced, the water quality is polluted, and the disease can be caused when the water environment is serious; moreover, a large amount of excrement is also generated during the growth of the prawns, the excrement is fully excreted in the pond, and the excrement and the residual bait are mixed in the pond water, so that the pollution of the pond water is aggravated, the water quality of the culture pond is further deteriorated, the death of the prawns is caused, and the loss is caused to the culture production of the prawns; the industrial shrimp culture needs to change water continuously, discharge waste water and enter new water. At present, the shrimp culture wastewater seriously pollutes the environment.
The industrial shrimp culture has the key that the shrimps cannot attack diseases, microorganisms in pond water must be controlled well, viruses, bacteria, parasites and the like cannot be propagated in a large quantity, and the viruses, the bacteria, the parasites and the like are controlled within a certain safe quantity range, so that the microorganisms for decomposing organic matters in the pond water are rare, a large quantity of organic matters in the pond water cannot be decomposed and converted, and new organic matters are generated every day; as the pond water is aerated all the time, organic matters in the pond water gradually become particles, so that a large amount of organic particles are suspended in the pond water, and the organic particles lead the discharged shrimp-farming wastewater to be seriously eutrophicated, cause oxygen deficiency in the water, lead other organisms in the water to be difficult to survive and often cause that the method for purifying the wastewater by utilizing organisms is difficult to implement. Therefore, the removal of organic particles in water is a key problem for the success of treating industrial shrimp culture wastewater. The organic particles are removed by a common method, the problems of difficult operation, high investment cost, new pollution and the like are caused, and the production practice is not implemented.
If the waste water for shrimp culture is not treated and is directly discharged, a pollution source is formed, the environment around the farm is polluted, and finally, the pollution of the nearby sea area is caused, and the offshore ecological crisis is caused.
Disclosure of Invention
Aiming at the technical problems, the invention provides a method for treating industrial prawn culture wastewater, which comprises the following steps:
(1) building a wastewater treatment facility outdoors: constructing an adsorption pond, an air exchange pond, a sediment recovery pond and a biological purification pond outside an industrial prawn culture workshop; the adsorption pool is sequentially connected with the air exchange pool and the biological purification pool through a water pipeline provided with a valve; the sediment recovery tank is respectively connected with the adsorption tank and the air exchange tank through water pipelines provided with valves; between the wastewater treatment facilities, wastewater naturally flows in and out by virtue of water level difference;
(2) adding mud silt of the mud flat into the workshop wastewater: when wastewater is discharged from a culture pond of an industrial prawn culture workshop, muddy silt is thrown at an outlet of a wastewater discharge channel of the whole workshop; the muddy silt is fully mixed in the wastewater and then suspended in the water, so that the turbid wastewater flows into an adsorption tank; replenishing muddy silt to the outlet of the waste water discharge channel in time, and cleaning impurities remained at the outlet of the waste water discharge channel in time;
(3) removing organic particles in the wastewater in an adsorption tank: suspended matters formed by adsorbing organic particles by muddy silt in the wastewater are deposited in an adsorption tank, and the wastewater becomes clear; flushing the sediment at the bottom of the adsorption tank by using a water pump to ensure that the changed clear wastewater is turbid again and then deposited and changed into clear; repeating the above steps for 2-3 times to fully coagulate and deposit the wastewater, i.e. the organic particles in the wastewater are combined with the muddy silt to deposit on the bottom of the tank; removing organic particles from the wastewater, then clearing the wastewater, and discharging the cleared wastewater into a ventilation tank;
(4) adding dissolved oxygen to the wastewater in the aeration tank: the time for storing the wastewater in the ventilation tank is more than 24 hours; adding dissolved oxygen to the wastewater by means of natural wind blowing and solarization, wherein the dissolved oxygen is used for oxidizing harmful substances in the wastewater; the wastewater after the dissolved oxygen is added is discharged into a biological purification pond;
(5) recovering the sediment in a sediment recovery tank: after the waste water changed into clear in the adsorption tank is discharged, flushing the sediment in the adsorption tank to a sediment recovery tank; then, discharging the waste water on the sediment of the sediment recovery tank to a ventilation tank;
(6) and (3) oxidizing and decomposing the deposit in a sunning ground: transporting the sediments in the sediment recovery pond to an open space of a sunning ground for flat paving and insolation; the sediments are dried in the sun and are flapped into powder, so that organic particles in the sediments are oxidized, decomposed and converted into nutrient salt for the rich water of aquaculture, and the cyclic utilization of substances and energy is realized;
(7) culturing phytoplankton in a biological purification pond by utilizing nutrient salts contained in the wastewater: the industrial prawn culture wastewater is rich in nutritive salt, and after the wastewater is discharged into the biological purification pond from the ventilation pond, phytoplankton in the biological purification pond absorbs the nutritive salt brought by the wastewater to rapidly propagate and grow, so that the nutritive salt contained in the wastewater is consumed, and the water quality of the biological purification pond is purified;
(8) an oyster cultivation cage is arranged in the biological purification pond: after the oysters are placed into the oyster cultivation cage, floating balls are placed in the net bags on the uppermost surface of the oyster cultivation cage, the net bags are supported into a cage shape by the floating balls, and bag openings are tied; fixing the oyster cultivation cage in a triangular frame, placing the oyster cultivation cage in a biological purification pond, tying a sinker at the bottom of the triangular frame, and enabling the oyster cultivation cage to stand in water by adjusting the sinker, wherein the floating ball is exposed out of the water surface; the middle part of the oyster cultivation cage is tied with a pull rope, and the other end of the pull rope is fixed on a raft rope of the biological purification pond; with the increase of the weight of the oyster, the oyster cultivation cage sinks, and sinkers are lightened in time;
(9) filtering phytoplankton and suspended particles in a biological purification pond by using oysters: the oysters filter and feed a large amount of phytoplankton as biological bait to promote the growth and development of the oysters; meanwhile, the oysters also filter suspended particles in the water body, gather the suspended particles at gills and continuously discharge the particles out of the body in the form of false feces; the oyster cultivation cage floats and shakes with breeze blown by the air in water like a tumbler, excrement and false excrement generated by the oysters are discharged out of the cage, the water permeability of the oyster cultivation cage is improved, the growth environment of the oysters is improved, and the oysters are healthily filtered and eaten; the excrement and the false excrement of the oysters sink to the bottom of the pond, so that the water quality of the pond is purified;
(10) constructing an ecological food chain in a biological purification pond: stocking omnivorous fishes and carnivorous fishes in the biological purification pond; the oyster feces which sink to the bottom of the pool are eaten by the omnivorous fishes, so that ecological utilization is realized; meanwhile, carnivorous fishes eat weak organisms in the biological purification pond, so that the ecological balance of the biological purification pond is maintained;
(11) recycling wastewater: the industrial prawn culture wastewater is treated by an adsorption tank, an air exchange tank, a sediment recovery tank and a biological purification pond, so that organic particles and nutritive salt in the wastewater are removed, and the water quality is purified; and the water quality detection is carried out after reaching the standard, and then the water is recycled, so that the water resource is saved, and the pressure on the ecological environment is reduced.
The above technical solution can be further optimized as follows:
and (3) adopting cement pools for the adsorption pool, the ventilation pool and the sediment recovery pool in the step (1).
And (2) the water pipeline in the step (1) is made of PVC.
The depth of the aeration pool in the step (1) is 30 cm, and the water level of the contained wastewater is 20 cm.
And (3) selecting the omnivorous fishes from the pikes in the step (10).
The mullet single bar weighs 240-260 grams.
28-32 mullets are bred on the water surface per mu.
And (3) selecting weever as the carnivorous fish in the step (10).
The weever strip weighs 240-260 g.
16-20 weever are put in the whole pond water surface for breeding.
Compared with the prior art, the invention mainly has the following remarkable advantages:
1. according to the principle of 'ecology, health and circulation', the aquaculture wastewater treatment facility is upgraded and reformed, and the industrial shrimp culture wastewater is treated step by means of technical innovation, comprehensive application of physical adsorption, ecological utilization and the like, so that the aims of removing organic particles in water, increasing dissolved oxygen of water, promoting conversion of nutritive salt, biologically purifying water quality and recycling purified water are successfully fulfilled, and the treatment level of the industrial shrimp culture wastewater is obviously improved.
2. The technical route adopted by the invention aiming at the condition that organic particles in industrial prawn culture wastewater cause pollution is as follows: organic particles are deposited in an adsorption tank, sediment is collected in a sediment recovery tank, the sediment is spread in a sunning ground, is subjected to oxidative decomposition through exposure and heating, is beaten into powder to generate nutritive salt, is thrown into a culture pond to be absorbed by algae to generate a large amount of plankton, and is ingested and utilized by organisms cultured in the pond. The concrete measures are as follows: the muddy silt taken from the mud flat is used at a wastewater discharge port of an industrial prawn culture workshop, the muddy silt is suspended in the wastewater in the adsorption tank, the muddy silt in the wastewater is adsorbed together with organic particles and is gathered into new particle bodies to sink to the bottom of the tank, the muddy silt on the mud flat is flushed for multiple times, the turbid wastewater is gradually cleared, and the organic particles suspended in the wastewater are deposited to the bottom of the tank and are mixed in the muddy silt at the bottom of the tank; collecting and transporting pool bottom sediments generated when wastewater is treated in the adsorption pool to a sunning ground, spreading and exposing to the sun, and carrying out exposure heating, oxidative decomposition and beating on organic particles mixed in the muddy silt into powder to convert the organic particles into nutritive salt, wherein the nutritive salt is a good fertilizer for aquaculture rich water and is beneficial to the growth of plankton.
3. The technical route of the invention aiming at the conditions of oxygen deficiency and rich nutrient salt in industrial prawn culture wastewater is as follows: the shrimp culture wastewater without organic particles is transferred into a ventilation pool to increase dissolved oxygen, wind blows and insolates to remove harmful substances, phytoplankton is cultivated in a biological purification pond to consume nutrient salt contained in the wastewater, oysters filter and eat to purify the water quality of the pond, artificial manure of the oysters sinks to the bottom of the pond to be consumed by feeding of omnivorous fishes, the carnivorous fishes clean organisms, the water quality index meets the discharge standard, and the wastewater is recycled. The concrete measures are as follows: the waste water from the adsorption tank passes through an air exchange tank, and is dried by natural wind to increase oxygen and remove harmful substances in water; then the wastewater enters a purification pond for culturing oysters and omnivorous fishes, nutrient salt in the wastewater is absorbed and consumed by algae in the pond, and phytoplankton in the pond is propagated and grown in a large quantity; oysters ingest a large amount of phytoplankton, larger organic particles which cannot be eaten are discharged out of the body in the form of false manure, and the false manure of the oysters sinks to the bottom of the pond to be ingested and utilized by omnivorous fishes; the carnivorous fish cleans up weak organisms and maintains the ecological balance of the pond; therefore, a food chain of the pond biosphere is constructed, and the conversion of materials and energy is completed.
4. The invention has three innovative bright points: firstly, a method for removing organic particles in shrimp culture wastewater; secondly, a method for utilizing the oyster false feces by the omnivorous fishes; thirdly, the oyster cultivation cage rocks along with waves in the pond, so that false dung is prevented from blocking meshes of the cultivation cage, and the internal environment of the oyster cultivation cage serving as a place where oysters inhabit and grow is kept in an aerobic state.
5. The method is reasonable, is simple and convenient to operate, has obvious environmental protection benefit and economic benefit, and has good popularization prospect.
Drawings
FIG. 1 is a schematic diagram of the structural layout and wastewater flow direction of an industrial prawn farming workshop;
FIG. 2 is a schematic view of the structural layout and wastewater flow direction of an outdoor wastewater treatment facility;
FIG. 3 is a schematic diagram of the structure and layout of an oyster cultivation cage;
in the figure: 1-an industrial prawn culture workshop, 2-a culture pond, 3-a wastewater discharge channel, 4-a wastewater discharge channel outlet, 5-an adsorption pond, 6-a water pump, 7-a valve, 8-a water pipeline, 9-an air exchange pond, 10-a pond water inlet valve, 11-a sediment recovery pond, 12-a mullet, 13-a weever, 14-a raft rope, 15-an oyster culture cage, 16-a pond water outlet valve, 17-a biological purification pond, 18-a triangular frame, 19-a sunning ground, 20-an oyster, 21-a sinker, 22-a floating ball, 23-a pull rope and 24-a water surface.
Detailed Description
The present invention will be described in detail below with reference to the following examples and accompanying drawings.
Example 1
See fig. 1, 2 and 3. A treatment method of industrial prawn culture wastewater comprises the following steps:
(1) building a wastewater treatment facility outdoors: an adsorption pond 5, a ventilation pond 9, a sediment recovery pond 11 and a biological purification pond 17 are built outside an industrial prawn culture workshop 1; the adsorption tank 5 is sequentially connected with a ventilation tank 9 and a biological purification pond 17 through a water pipeline 8 provided with a valve 7; the sediment recovery tank 11 is respectively connected with the adsorption tank 5 and the ventilation tank 9 through a water pipeline 8 provided with a valve 7; between the wastewater treatment facilities, wastewater naturally flows in and out by virtue of water level difference;
(2) adding mud silt of the mud flat into the workshop wastewater: when wastewater is discharged from a culture pond 2 of an industrial prawn culture workshop 1, muddy silt is thrown at an outlet 4 of a wastewater discharge channel of the whole workshop; the muddy silt is fully mixed in the wastewater and then suspended in the water, so that the turbid wastewater flows into the adsorption tank 5; supplementing muddy silt to the outlet 4 of the wastewater discharge channel in time, and cleaning impurities remained at the outlet 4 of the wastewater discharge channel in time;
(3) removing organic particles in the wastewater in an adsorption tank 5: suspended matters formed by adsorbing organic particles by muddy silt in the wastewater are deposited in the adsorption tank 5, and the wastewater becomes clear; flushing up the sediment at the bottom of the adsorption pool 5 by a water pump 6 to make the changed clear wastewater turbid again and then deposited and changed into clear; generally, the operation is repeated for 2 times, if the suspended matters are obviously more, the operation is repeated for 3 times, so that the wastewater is fully coagulated and deposited, namely, the organic particles in the wastewater are combined with muddy silt to be deposited at the bottom of the pool; the waste water is cleared after organic particles are removed, and the cleared waste water is discharged into a ventilation pool 9;
(4) adding dissolved oxygen to the wastewater in the aeration tank 9: the waste water storage time of the aeration tank 9 is not less than 24 hours; adding dissolved oxygen to the wastewater by means of natural wind blowing and solarization, wherein the dissolved oxygen is used for oxidizing harmful substances in the wastewater; the wastewater after the increase of the dissolved oxygen is discharged into a biological purification pond 17;
(5) recovering the sediment in the sediment recovery tank 11: after the wastewater of the adsorption tank 5 is discharged, the sediment of the adsorption tank 5 is flushed to a sediment recovery tank 11; then, discharging the waste water on the sediment of the sediment recovery tank 11 to the aeration tank 9;
(6) oxidative decomposition of the deposits in the sunburn 19: the sediment in the sediment recovery pond 11 is transported to a sunning ground 19 to be laid and exposed in the open air; the sediments are dried in the sun and are flapped into powder, so that organic particles in the sediments are oxidized, decomposed and converted into nutrient salt for the rich water of aquaculture, and the cyclic utilization of substances and energy is realized;
(7) the phytoplankton are cultivated in the biological purification pond 17 by utilizing the nutrient salt contained in the wastewater: the industrial prawn culture wastewater is rich in nutritive salt, and after the wastewater is discharged into the biological purification pond 17 from the ventilation pond 9, phytoplankton in the biological purification pond 17 absorbs the nutritive salt brought by the wastewater to rapidly propagate and grow, so that the nutritive salt contained in the wastewater is consumed, and the water quality of the biological purification pond 17 is purified;
(8) an oyster cultivation cage 15 is arranged in the biological purification pond 17: after the oysters 20 are placed into the oyster cultivation cage 15, floating balls 22 are placed in the uppermost mesh bag of the oyster cultivation cage 15, the mesh bag is supported into a cage shape by the floating balls 22, and a bag opening is tied; the oyster cultivation cage 15 is fixed in a triangular frame 18 and placed in a biological purification pond 17, a sinker 21 is tied at the bottom of the triangular frame 18, the oyster cultivation cage 15 is erected in water by adjusting the sinker 21, and a floating ball 22 is exposed out of the water; the middle part of the oyster cultivation cage 15 is tied with a pull rope 23, and the other end of the pull rope 23 is fixed on a raft rope 14 of the biological purification pond 17; with the increase of the weight of the oyster 20, the oyster cultivation cage 15 sinks, and the sinkers 21 are lightened in time;
(9) the phytoplankton and suspended particles are filtered in the biological purification pond 17 by using oysters 20: the oyster 20 is prepared by filtering and feeding phytoplankton as biological bait to promote growth and development; meanwhile, the oyster 20 also filters suspended particles in the water body, gathers the suspended particles at gills and continuously discharges the particles out of the body in the form of false feces; the oyster cultivation cage 15 floats and shakes with the breeze blown by the air in the water like a tumbler, and excrement and false excrement generated by the oysters 20 are discharged out of the cage, so that the water permeability of the oyster cultivation cage 15 is increased, the growth environment of the oysters 20 is improved, and the oysters 20 are healthily filtered and eaten; the excrement and the false excrement of the oysters 20 sink to the bottom of the pond, so that the water quality of the pond is purified;
(10) an ecological food chain is constructed in the biological purification pond 17: feeding omnivorous and carnivorous fishes in the biological purification pond 17; the oyster feces which sink to the bottom of the pool are eaten by the omnivorous fishes, so that ecological utilization is realized; meanwhile, carnivorous fishes eat weak organisms in the biological purification pond 17, so that the ecological balance of the biological purification pond 17 is maintained;
(11) recycling wastewater: the industrial prawn culture wastewater is treated by the adsorption tank 5, the ventilation tank 9, the sediment recovery tank 11 and the biological purification pond 17, so that organic particles and nutritive salt in the wastewater are removed, and the water quality is purified; and the water quality detection is carried out after reaching the standard, and then the water is recycled, so that the water resource is saved, and the pressure on the ecological environment is reduced.
Example 2
See fig. 1, 2 and 3. On the basis of the technical scheme recorded in the embodiment 1, the adsorption tank 5, the ventilation tank 9 and the sediment recovery tank 11 in the step (1) are cement tanks, so that the industrial prawn culture wastewater treatment method is firm and durable, is convenient to clean and saves cost; the water pipeline 8 in the step (1) is made of PVC, so that the water pipeline is anticorrosive and cheap.
Example 3
See fig. 1, 2 and 3. On the basis of the technical scheme recorded in the embodiment 1, the depth of a pool 9 of the air exchange pool in the step (1) is 30 cm, the water level of the contained wastewater is 20 cm, and the shallow water level is favorable for rapidly increasing the dissolved oxygen concentration of the wastewater.
Example 4
See fig. 1, 2 and 3. An industrial prawn culture wastewater treatment method, based on the technical scheme recorded in the embodiment 1, the method comprises the steps of (10) selecting a pike 12 as a omnivorous fish; the weight of a single pike 12 is about 250 g, and the pike can be actually controlled at 240-260 g; the mullets 12 are bred on the water surface of each mu by about 30, and can be actually controlled by 28-32 mullets.
Example 5
See fig. 1, 2 and 3. An industrial prawn culture wastewater treatment method, on the basis of the technical scheme recorded in the embodiment 1, the carnivorous fish in the step (10) selects weever 13; the weight of each weever 13 strip is about 250 g, and the weever can be actually controlled at 240-260 g; the perches 13 are bred in about 18 strips on the whole pond water surface, and 16 to 20 strips can be actually mastered.
Claims (10)
1. A treatment method of industrial prawn culture wastewater is characterized by comprising the following steps:
(1) building a wastewater treatment facility outdoors: constructing an adsorption pond, an air exchange pond, a sediment recovery pond and a biological purification pond outside an industrial prawn culture workshop; the adsorption pool is sequentially connected with the air exchange pool and the biological purification pool through a water pipeline provided with a valve; the sediment recovery tank is respectively connected with the adsorption tank and the air exchange tank through water pipelines provided with valves; between the wastewater treatment facilities, wastewater naturally flows in and out by virtue of water level difference;
(2) adding mud silt of the mud flat into the workshop wastewater: when wastewater is discharged from a culture pond of an industrial prawn culture workshop, muddy silt is thrown at an outlet of a wastewater discharge channel of the whole workshop; the muddy silt is fully mixed in the wastewater and then suspended in the water, so that the turbid wastewater flows into an adsorption tank; replenishing muddy silt to the outlet of the waste water discharge channel in time, and cleaning impurities remained at the outlet of the waste water discharge channel in time;
(3) removing organic particles in the wastewater in an adsorption tank: suspended matters formed by adsorbing organic particles by muddy silt in the wastewater are deposited in an adsorption tank, and the wastewater becomes clear; flushing the sediment at the bottom of the adsorption tank by using a water pump to ensure that the changed clear wastewater is turbid again and then deposited and changed into clear; repeating the above steps for 2-3 times to fully coagulate and deposit the wastewater, i.e. the organic particles in the wastewater are combined with the muddy silt to deposit on the bottom of the tank; removing organic particles from the wastewater, then clearing the wastewater, and discharging the cleared wastewater into a ventilation tank;
(4) adding dissolved oxygen to the wastewater in the aeration tank: the time for storing the wastewater in the ventilation tank is more than 24 hours; adding dissolved oxygen to the wastewater by means of natural wind blowing and solarization, wherein the dissolved oxygen is used for oxidizing harmful substances in the wastewater; the wastewater after the dissolved oxygen is added is discharged into a biological purification pond;
(5) recovering the sediment in a sediment recovery tank: after the waste water changed into clear in the adsorption tank is discharged, flushing the sediment in the adsorption tank to a sediment recovery tank; then, discharging the waste water on the sediment of the sediment recovery tank to a ventilation tank;
(6) and (3) oxidizing and decomposing the deposit in a sunning ground: transporting the sediments in the sediment recovery pond to an open space of a sunning ground for flat paving and insolation; the sediments are dried in the sun and are flapped into powder, so that organic particles in the sediments are oxidized, decomposed and converted into nutrient salt for the rich water of aquaculture, and the cyclic utilization of substances and energy is realized;
(7) culturing phytoplankton in a biological purification pond by utilizing nutrient salts contained in the wastewater: the industrial prawn culture wastewater is rich in nutritive salt, and after the wastewater is discharged into the biological purification pond from the ventilation pond, phytoplankton in the biological purification pond absorbs the nutritive salt brought by the wastewater to rapidly propagate and grow, so that the nutritive salt contained in the wastewater is consumed, and the water quality of the biological purification pond is purified;
(8) an oyster cultivation cage is arranged in the biological purification pond: after the oysters are placed into the oyster cultivation cage, floating balls are placed in the net bags on the uppermost surface of the oyster cultivation cage, the net bags are supported into a cage shape by the floating balls, and bag openings are tied; fixing the oyster cultivation cage in a triangular frame, placing the oyster cultivation cage in a biological purification pond, tying a sinker at the bottom of the triangular frame, and enabling the oyster cultivation cage to stand in water by adjusting the sinker, wherein the floating ball is exposed out of the water surface; the middle part of the oyster cultivation cage is tied with a pull rope, and the other end of the pull rope is fixed on a raft rope of the biological purification pond; with the increase of the weight of the oyster, the oyster cultivation cage sinks, and sinkers are lightened in time;
(9) filtering phytoplankton and suspended particles in a biological purification pond by using oysters: the oysters filter and feed a large amount of phytoplankton as biological bait to promote the growth and development of the oysters; meanwhile, the oysters also filter suspended particles in the water body, gather the suspended particles at gills and continuously discharge the particles out of the body in the form of false feces; the oyster cultivation cage floats and shakes with breeze blown by the air in water like a tumbler, excrement and false excrement generated by the oysters are discharged out of the cage, the water permeability of the oyster cultivation cage is improved, the growth environment of the oysters is improved, and the oysters are healthily filtered and eaten; the excrement and the false excrement of the oysters sink to the bottom of the pond, so that the water quality of the pond is purified;
(10) constructing an ecological food chain in a biological purification pond: stocking omnivorous fishes and carnivorous fishes in the biological purification pond; the oyster feces which sink to the bottom of the pool are eaten by the omnivorous fishes, so that ecological utilization is realized; meanwhile, carnivorous fishes eat weak organisms in the biological purification pond, so that the ecological balance of the biological purification pond is maintained;
(11) recycling wastewater: the industrial prawn culture wastewater is treated by an adsorption tank, an air exchange tank, a sediment recovery tank and a biological purification pond, so that organic particles and nutritive salt in the wastewater are removed, and the water quality is purified; and the water quality detection is carried out after reaching the standard, and then the water is recycled, so that the water resource is saved, and the pressure on the ecological environment is reduced.
2. The industrial prawn culture wastewater treatment method according to claim 1, wherein the adsorption tank, the aeration tank and the sediment recovery tank in the step (1) are cement tanks.
3. The industrial prawn culture wastewater treatment method according to claim 1, wherein the water pipeline in the step (1) is made of PVC.
4. The method for treating industrial prawn culture wastewater as claimed in claim 1, wherein the aeration pool in step (1) is 30 cm deep and contains wastewater at a level of 20 cm.
5. The industrial prawn culture wastewater treatment method according to claim 1, wherein the omnivorous fishes in the step (10) are mullets.
6. The method for treating industrial prawn culture wastewater as claimed in claim 5, wherein the weight of the single stick of the pike is 240-260 g.
7. The method for treating industrial prawn culture wastewater as claimed in claim 6, wherein 28-32 mullets are put on each mu of water surface.
8. The industrial prawn culture wastewater treatment method according to claim 1, wherein the carnivorous fish in the step (10) is selected from weever.
9. The method for treating industrial prawn culture wastewater as set forth in claim 8, wherein the weever single stick weighs 240-260 g.
10. The method for treating industrial prawn culture wastewater as claimed in claim 9, wherein 16-20 weever fish are released and cultured on the whole pond water surface.
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| CN114731979A (en) * | 2022-04-15 | 2022-07-12 | 浙江万里学院 | Pond culture system based on water body recycling |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114731979B (en) * | 2022-04-15 | 2022-12-23 | 浙江万里学院 | Pond culture system based on water cyclic utilization |
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