Mariculture tail water treatment system

Abstract

The utility model discloses a mariculture tail water treatment system. The mariculture tail water treatment system comprises a pretreatment unit, an ultrafiltration unit, a disinfection unit and a control unit, pollutants such as residual feed, excrement, granular dirt, soluble organic matters, SS (suspended solids), COD (chemical oxygen demand), BOD (biochemical oxygen demand), ammonia nitrogen, total nitrogen, total phosphorus and the like in the aquaculture tail water are removed by the pretreatment unit; the ultrafiltration membrane is used as a core, the filtering precision is high, and the quality of produced water is good; the ultrafiltration membrane can remove float sludge and harmful microorganisms in natural seawater without generating harmful by-products, and the turbidity of water produced by ultrafiltration is low, so that the sterilization effect of the ultraviolet sterilizer is improved; in conclusion, the tail water treatment device can meet various types of mariculture tail water treatment, and is simple to operate, low in operation pressure, good in effluent quality, large in flux and free of secondary pollution.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of seawater culture tail water treatment systems. BACKGROUND

[0002] The seawater culture technology of our country is relatively backward, and the offshore aquaculture density is increasing, which brings a series of environmental problems, such as red tide and bottom mud layer deterioration. The discharge of seawater culture tail water is undoubtedly a great harm, which contains feces, leftover feed, organic pollutants, etc., and most of the tail water is directly discharged into the sea after simple natural sedimentation. This leads to the increasing of nitrogen, phosphorus and COD content in the offshore sea area, which far exceeds the environmental carrying capacity of the water environment, resulting in long-term eutrophication of the water body and deterioration of the bottom, causing great harm to the marine environment. Studies have shown that during the process of shellfish, fish and shrimp culture, the absorption of nitrogen accounts for 33%, 36% and 15% of the solid granular feed, respectively, and the absorption of phosphorus accounts for 22%, 33% and 10% of the solid granular feed, respectively. The Second National Pollution Source Census Bulletin released in 2020 shows that the pollution intensity of water product breeding output of aquaculture industry is: chemical oxygen demand 13.6 kg / t, ammonia nitrogen 0.45 kg / t, total nitrogen 2.02 kg / t, and total phosphorus 0.33 kg / t. The China Fishery Environmental and Ecological Status Bulletin (2018) shows that the main substances exceeding the standard in the seawater key breeding area are inorganic nitrogen and active phosphate.

[0003] For the discharge of seawater culture tail water, the Ministry of Agriculture has issued the Discharge Requirements for Seawater Culture (SCT 9103-2007), and some provinces have also issued local standards, such as Fujian Province, Hunan Province, Hainan Province, Jiangsu Province and Guangdong Province.

[0004] Traditional seawater tail water treatment technology can be divided into three categories: physical method, chemical method and biological method. The physical method mainly uses sedimentation, filtration, foam separation and other methods to remove visible suspended solids and particulate matter in the culture tail water. The chemical method includes electrochemical technology, ozone oxidation, coagulation and sedimentation, oxidation and reduction, chlorine oxidation disinfection, chemical neutralization and other methods. The biological method mainly uses the absorption and decomposition of organisms to achieve tail water purification, which currently mainly includes aquatic plants, aquatic animals and microbial treatment methods. However, traditional tail water treatment technology has limitations, and single technology cannot completely treat pollutants. Therefore, it is particularly important to develop low-cost and effective seawater culture tail water treatment technology. UTILITY MODEL CONTENT

[0005] The utility model aims to provide a kind of seawater culture tail water treatment system.

[0006] The technical scheme of the utility model is as follows:

[0007] A mariculture tail water treatment system comprises:

[0008] A pretreatment unit comprising a microfilter, a protein separator, an intermediate water tank and a biological aerated filter connected in series, for removing leftover feed, feces, particulate dirt, soluble organic matter, SS, COD, BOD, ammonia nitrogen, total nitrogen and total phosphorus in mariculture tail water;

[0009] An ultrafiltration unit for removing floating sludge and harmful microorganisms in the water produced by the pretreatment unit;

[0010] A disinfection unit for removing residual bacteria in the water produced by the ultrafiltration unit;

[0011] And a control unit for controlling the cooperative work of the pretreatment unit, the ultrafiltration unit and the disinfection unit.

[0012] In a preferred embodiment of the present application,

[0013] The ultrafiltration unit comprises an immersed ultrafiltration device,

[0014] The disinfection unit comprises an ultraviolet sterilizer,

[0015] The mariculture tail water is communicated to the inlet of the microfilter through a first electric control valve, the outlet of the microfilter is communicated to the inlet of the protein separator through a second electric control valve, the outlet of the protein separator is communicated to the inlet of the intermediate water tank through a third electric control valve, the outlet of the intermediate water tank is communicated to the inlet of the biological aerated filter through a fourth electric control valve, a water inlet pump and a fifth electric control valve in sequence, the outlet of the biological aerated filter is communicated to the inlet of the immersed ultrafiltration device, the water outlet of the immersed ultrafiltration device is communicated to the inlet of the ultraviolet sterilizer through a sixth electric control valve, a water outlet pump, a first one-way valve and a seventh electric control valve in sequence, the outlet of the ultraviolet sterilizer is communicated to subsequent discharge through an eighth electric control valve; the control unit is electrically connected with the first to eighth electric control valves, the water inlet pump, the water outlet pump and the ultraviolet sterilizer.

[0016] Further preferably, the sewage outlet of the microfilter is communicated to subsequent sewage through a ninth electric control valve, and the control unit is electrically connected with the ninth electric control valve.

[0017] Further preferably, the protein separator comprises a body, a circulating pump and a venturi, the upper section of the body has an inlet and a blowdown port, the top has a backwash port and a tail gas outlet, the lower part has an outlet, a vent port, a circulating outlet and a circulating inlet; the blowdown port is communicated with the subsequent vent, the tail gas outlet and the external ozone gas source are respectively communicated with the first inlet of the venturi through a tenth electric control valve and an eleventh electric control valve, the circulating outlet is communicated with the inlet of the circulating pump through a twelfth electric control valve, the outlet of the circulating pump is communicated with the second inlet of the venturi through a thirteenth electric control valve, the outlet of the venturi is respectively communicated with the backwash port and the circulating inlet through a fourteenth electric control valve and a fifteenth electric control valve, and the vent port is communicated with the subsequent vent through a sixteenth electric control valve; the control unit is in electric connection with the tenth to sixteenth electric control valves and the circulating pump.

[0018] Further preferably, the biological aerated filter comprises a tank body, a first fan and a pipeline mixer, the tank body has an anoxic section and an aerobic section from bottom to top, the lower part of the aerobic section has an air inlet, the lower part of the anoxic section has a backwash gas inlet, the lower part of the tank body has an inlet and a backwash port, and the upper part of the tank body has an outlet, which serves as the outlet of the biological aerated filter; the first fan is respectively communicated with the air inlet and the backwash gas inlet through a seventeenth electric control valve and an eighteenth electric control valve, the water inlet pump is communicated with the inlet of the pipeline mixer through the fifth electric control valve, the outlet of the biological aerated filter is respectively communicated with the inlet and the backwash port of the pipeline mixer through a nineteenth electric control valve and a twentieth electric control valve, and the outlet of the pipeline mixer is communicated with the inlet of the biological aerated filter; the control unit is in electric connection with the seventeenth to twentieth electric control valves and the first fan.

[0019] Further preferably, the immersed ultrafiltration device comprises a membrane tank, at least one immersed ultrafiltration unit, a backwash tank, a backwash pump, a sodium dosing tank and a second fan;

[0020] At least one submerged ultrafiltration unit is arranged in the membrane tank, and water outlets of the submerged ultrafiltration units are connected to form a water outlet of the submerged ultrafiltration device; the water outlet of the submerged ultrafiltration device is connected to the inlet of the ultraviolet sterilizer in sequence through the sixth electric control valve, a water production pump, a first one-way valve, a twenty-first electric control valve and a seventh electric control valve; the water production pump is connected to the inlet of the backwashing tank in sequence through the first one-way valve, the twenty-first electric control valve and a twenty-second electric control valve, and is connected to the inlet of the secondary sodium dosing tank in sequence through the first one-way valve, the twenty-first electric control valve and a twenty-third electric control valve; the outlet of the backwashing tank is connected to the water outlet of the submerged ultrafiltration device in sequence through a twenty-fourth electric control valve, a twenty-fifth electric control valve, a backwashing pump, a second one-way valve, a twenty-sixth electric control valve and a twenty-seventh electric control valve, and is connected to subsequent emptying in sequence through the twenty-fourth electric control valve and a twenty-eighth electric control valve; the outlet of the secondary sodium dosing tank is connected to the pipeline between the twenty-sixth electric control valve and the twenty-seventh electric control valve; a second fan is connected to the air inlet of the at least one submerged ultrafiltration unit; the outlet of the membrane tank is connected to subsequent emptying through a twenty-ninth electric control valve, and the inlet of the membrane tank is the inlet of the submerged ultrafiltration device; the control unit is electrically connected with the twenty-first to twenty-ninth electric control valves, the backwashing pump and the second fan.

[0021] More preferably, the ultrafiltration membrane used by the at least one submerged ultrafiltration unit is a hollow fiber ultrafiltration membrane or a flat plate ceramic ultrafiltration membrane.

[0022] More preferably, the hollow fiber ultrafiltration membrane has a specification that a molecular weight cut-off is 60000-150000D, a transmembrane pressure difference is 0.01-0.5bar and a flux is 10-30LMH; and a single set of membrane group has an area of 10-2600 square meters.

[0023] More preferably, the flat plate ceramic ultrafiltration membrane has a specification that a molecular weight cut-off is 60000-150000D, a transmembrane pressure difference is 0.01-0.5bar and a flux is 10-30LMH; and a single set of membrane group has an area of 10-2600 square meters.

[0024] The utility model discloses the beneficial effect is:

[0025] 1, the residual feed and the breeding biological metabolite are the main source of phosphorus in the breeding tail water. In addition, the residual feed and the excrement contain 30%~60% of the nitrogen that is not used in the breeding process of the breeding animal, and the unused nitrogen exists in the form of organic nitrogen, ammonia nitrogen, nitrite nitrogen and nitrate nitrogen in the breeding water body, and the utility model utilizes the solid-liquid separation performance of the microfiltration machine to remove the residual feed and the excrement in the breeding tail water.

[0026] 2, the utility model utilizes the protein separator to remove various granular dirt and soluble organic matter.

[0027] 3, the utility model discloses a biological aerated filter to remove SS, COD, BOD, ammonia nitrogen, total nitrogen, total phosphorus and other pollutants.

[0028] 4, the utility model discloses a ultrafiltration membrane as the core, and the filtration precision is high, and the water quality is good, and the ultrafiltration membrane can remove floating sludge and harmful microorganism in natural seawater, and no harmful byproduct is produced.

[0029] 5, the utility model discloses can satisfy various seawater culture tail water treatment, and simple operation, and low operating pressure, and good water quality, and large flux, and no secondary pollution.

[0030] 6, the utility model discloses submerged ultrafiltration water turbidity is low, and it is favorable to improve the bactericidal effect of ultraviolet disinfection device. DRAWINGS

[0031] Figure 1 It is the structural schematic diagram of the utility model. CONCRETE IMPLEMENTING METHOD

[0032] The technical scheme of the utility model will be further explained and described in the following through concrete implementing method combining with the drawings.

[0033] As shown in Figure 1 A seawater culture tail water treatment system, comprising:

[0034] A pretreatment unit, comprising a microfilter 1, a protein separator 2, an intermediate water tank 3 and a biological aerated filter 4, for removing leftover feed, feces, particulate dirt, soluble organic matter, SS, COD, BOD, ammonia nitrogen, total nitrogen and total phosphorus in seawater culture tail water;

[0035] An ultrafiltration unit for removing floating sludge and harmful microorganisms in the water produced by the above-mentioned pretreatment unit;

[0036] A disinfection unit for removing residual bacteria in the water produced by the above-mentioned ultrafiltration unit;

[0037] And a control unit (not shown in the figure) for controlling the cooperative work of the above-mentioned pretreatment unit, ultrafiltration unit and disinfection unit.

[0038] Further, the ultrafiltration unit comprises an immersed ultrafiltration device 5, the disinfection unit comprises an ultraviolet disinfection device 6, and in addition, first to twenty-ninth electric control valves 701-729 are further included.

[0039] The aquaculture tail water is connected to the inlet of the microfilter 1 through the first electric control valve 701, the outlet of the microfilter 1 is connected to the inlet of the protein separator 2 through the second electric control valve 702, the outlet of the protein separator 2 is connected to the inlet of the intermediate water tank 3 through the third electric control valve 703, the outlet of the intermediate water tank 3 is connected to the inlet of the biological aerated filter 4 through the fourth electric control valve 704, a water inlet pump 8 and the fifth electric control valve 705 in sequence, the outlet of the biological aerated filter 4 is connected to the inlet of the submerged ultrafiltration device 5, the water outlet of the submerged ultrafiltration device 5 is connected to the inlet of the ultraviolet sterilizer 6 through the sixth electric control valve 706, a water outlet pump 56, a first one-way valve 57 and the seventh electric control valve 707 in sequence, the outlet of the ultraviolet sterilizer 6 is connected to the subsequent discharge through the eighth electric control valve 708.

[0040] The microfilter 1 is used to remove the residual feed and feces in the aquaculture tail water due to its solid-liquid separation performance, and the sewage outlet is connected to the subsequent sewage discharge through the ninth electric control valve 709.

[0041] The protein separator 2 is used to remove various particulate dirt and soluble organic matter, and comprises a body 20, a circulating pump 21 and a venturi tube 22, the upper section of the body 20 is provided with an inlet and a sewage outlet, the top is provided with a backwashing port and a tail gas outlet, the lower part is provided with an outlet, a discharge port, a circulating outlet and a circulating inlet; the sewage outlet is connected to the subsequent discharge, the tail gas outlet and an external ozone gas source are connected to the first inlet of the venturi tube 22 through the tenth electric control valve 710 and the eleventh electric control valve 711 respectively, the circulating outlet is connected to the inlet of the circulating pump 21 through the twelfth electric control valve 712, the outlet of the circulating pump 21 is connected to the second inlet of the venturi tube 22 through the thirteenth electric control valve 713, the outlet of the venturi tube 22 is connected to the backwashing port and the circulating inlet through the fourteenth electric control valve 714 and the fifteenth electric control valve 715 respectively, and the discharge port is connected to the subsequent discharge through the sixteenth electric control valve 716.

[0042] The biological aerated filter 4 is used to remove pollutants such as SS, COD, BOD, ammonia nitrogen, total nitrogen, total phosphorus, etc., and comprises a pool body 40, a first fan 41 and a pipeline mixer 42. The pool body 40 has an anoxic section 401 and an aerobic section 402 from bottom to top. The lower part of the aerobic section 402 has an air inlet, and the lower part of the anoxic section 401 has a backwashing air inlet. The lower part of the pool body 40 has an inlet and a backwashing outlet, and the upper part of the pool body 40 has an outlet which serves as the outlet of the biological aerated filter 4. The first fan 41 is connected to the air inlet and the backwashing air inlet through the seventeenth electric control valve 717 and the eighteenth electric control valve 718 respectively. The water inlet pump 8 is connected to the inlet of the pipeline mixer 42 through the fifth electric control valve 705. The outlet of the biological aerated filter 4 is connected to the inlet and the backwashing outlet of the pipeline mixer 42 through the nineteenth electric control valve 719 and the twentieth electric control valve 720 respectively. The outlet of the pipeline mixer 42 is connected to the inlet of the biological aerated filter 4. The above arrangement can make the effluent of the aerobic section 402 partially backflow, which is beneficial to nitrogen removal.

[0043] The submerged ultrafiltration device 5 comprises a membrane pool 50, at least one submerged ultrafiltration unit 51, a backwashing tank 52, a backwashing pump 53, a secondary sodium dosing tank 54 (used for maintenance cleaning and chemical cleaning of the submerged ultrafiltration unit to remove pollutants of the submerged ultrafiltration unit) and a second fan 55.

[0044] The at least one submerged ultrafiltration unit 51 is arranged in the membrane pool 50, and the water outlet of the submerged ultrafiltration unit 51 is connected to the water outlet of the submerged ultrafiltration device 5. The water outlet of the submerged ultrafiltration device 5 is connected to the inlet of the ultraviolet sterilizer 6 through the sixth electric control valve 706, the water production pump 56, the first one-way valve 57, the twenty-first electric control valve 721 and the seventh electric control valve 707 in sequence. The water production pump 56 is connected to the inlet of the backwashing tank 52 through the first one-way valve 57, the twenty-first electric control valve 721 and the twenty-second electric control valve 722 in sequence, and is connected to the inlet of the secondary sodium dosing tank 54 through the first one-way valve 57, the twenty-first electric control valve 721 and the twenty-third electric control valve 723 in sequence. The outlet of the backwashing tank 52 is connected to the water outlet of the submerged ultrafiltration device 5 through the twenty-fourth electric control valve 724, the twenty-fifth electric control valve 725, the backwashing pump 53, the second one-way valve 58, the twenty-sixth electric control valve 726 and the twenty-seventh electric control valve 727 in sequence, and is connected to subsequent emptying through the twenty-fourth electric control valve 724 and the twenty-eighth electric control valve 728 in sequence. The outlet of the secondary sodium dosing tank 54 is connected to the pipeline between the twenty-sixth electric control valve 726 and the twenty-seventh electric control valve 727. The outlet of the membrane pool 50 is connected to subsequent emptying through a twenty-ninth electric control valve 729. The inlet of the membrane pool 50 is the inlet of the submerged ultrafiltration device 5. The second fan 55 is connected to the air inlet of the at least one submerged ultrafiltration unit 51.

[0045] The utility model discloses a core is ultrafiltration membrane, and the filtration precision is high, and the water quality is good, and the ultrafiltration membrane can remove floating mud and harmful microorganism in natural seawater, and does not produce harmful byproduct, in addition, its turbidity of water is low, and it is favorable to improve the sterilization effect of ultraviolet sterilizer 6.

[0046] Preferably, the ultrafiltration membrane used by the at least one submerged ultrafiltration unit 51 is a hollow fiber ultrafiltration membrane or a flat ceramic ultrafiltration membrane.

[0047] The control unit is electrically connected with the first to twenty-ninth electrically-controlled valves 701-729, the water inlet pump 8, the water production pump 56, the ultraviolet sterilizer 6, the first fan 41, the second fan 55, the circulating pump 21 and the backwashing pump 53 to coordinate the work of the components at appropriate time, so that various seawater aquaculture tail water treatment can be satisfied, the operation is simple, the operation pressure is low, the water quality is good, the flux is large and there is no secondary pollution.

[0048] The above is only a preferred embodiment of the utility model, and thus cannot limit the range of the utility model, i.e. equivalent changes and modifications made according to the patent range and the content of the specification should still be within the range covered by the utility model.

Claims

1. A mariculture effluent treatment system, characterized by: It comprises: a pretreatment unit comprising a microfilter, a protein separator, an intermediate water tank and an aerated biological filter connected in series to remove residual feed, feces, particulate dirt, soluble organic matter, SS, COD, BOD, ammonia nitrogen, total nitrogen and total phosphorus in mariculture tail water; an ultrafiltration unit to remove floating sludge and harmful microorganisms in the water produced by the pretreatment unit; a disinfection unit to remove residual bacteria in the water produced by the ultrafiltration unit; and a control unit to control the cooperative work of the pretreatment unit, the ultrafiltration unit and the disinfection unit.

2. The mariculture tail water treatment system according to claim 1, wherein: the ultrafiltration unit comprises an immersed ultrafiltration device, the disinfection unit comprises an ultraviolet disinfection device, the mariculture tail water is communicated to the inlet of the microfilter through a first electric control valve, the outlet of the microfilter is communicated to the inlet of the protein separator through a second electric control valve, the outlet of the protein separator is communicated to the inlet of the intermediate water tank through a third electric control valve, the outlet of the intermediate water tank is communicated to the inlet of the aerated biological filter through a fourth electric control valve, a water inlet pump and a fifth electric control valve in sequence, the outlet of the aerated biological filter is communicated to the inlet of the immersed ultrafiltration device, the water outlet of the immersed ultrafiltration device is communicated to the inlet of the ultraviolet disinfection device through a sixth electric control valve, a water outlet pump, a first one-way valve and a seventh electric control valve in sequence, the outlet of the ultraviolet disinfection device is communicated to subsequent discharge through an eighth electric control valve, and the control unit is electrically connected with the first to eighth electric control valves, the water inlet pump, the water outlet pump and the ultraviolet disinfection device for control.

3. A system for treating the effluent from a marine farming operation as claimed in claim 2, wherein: The sewage outlet of the microfilter is communicated to subsequent sewage discharge through a ninth electric control valve, and the control unit is electrically connected with the ninth electric control valve for control.

4. A system for treating the effluent from a marine farming operation as claimed in claim 2, wherein: The protein separator comprises a body, a circulating pump and a venturi tube, the upper section of the body has an inlet and a sewage outlet, the top has a backwashing outlet and a tail gas outlet, the lower part has an outlet, a venting outlet, a circulating outlet and a circulating inlet; the sewage outlet is communicated to subsequent venting, the tail gas outlet and an external ozone gas source are respectively communicated to the first inlet of the venturi tube through a tenth electric control valve and an eleventh electric control valve, the circulating outlet is communicated to the inlet of the circulating pump through a twelfth electric control valve, the outlet of the circulating pump is communicated to the second inlet of the venturi tube through a thirteenth electric control valve, the outlet of the venturi tube is respectively communicated to the backwashing outlet and the circulating inlet through a fourteenth electric control valve and a fifteenth electric control valve, and the venting outlet is communicated to subsequent venting through a sixteenth electric control valve; and the control unit is electrically connected with the tenth to sixteenth electric control valves and the circulating pump for control.

5. A system for treating the effluent from a marine farming operation as claimed in claim 2, wherein: The aeration biological filter comprises a pool body, a first fan and a pipeline mixer, the pool body has an anoxic section and an aerobic section from bottom to top, the lower part of the aerobic section has an air inlet, the lower part of the anoxic section has a backwashing air inlet, the lower part of the pool body has an inlet and a backwashing outlet, the upper part of the pool body has an outlet which serves as the outlet of the aeration biological filter; the first fan is connected with the air inlet and the backwashing air inlet through a seventeenth electric control valve and an eighteenth electric control valve respectively, the water inlet pump is connected with the inlet of the pipeline mixer through the fifth electric control valve, the outlet of the aeration biological filter is connected with the inlet of the pipeline mixer and the backwashing outlet of the pipeline mixer through a nineteenth electric control valve and a twentieth electric control valve respectively, and the outlet of the pipeline mixer is connected with the inlet of the aeration biological filter; the control unit is electrically connected with the seventeenth to twentieth electric control valves and the first fan.

6. A system for treating the effluent from a marine farming operation as claimed in claim 2, wherein: The submerged ultrafiltration device comprises a membrane pool, at least one submerged ultrafiltration unit, a backwashing tank, a backwashing pump, a sodium addition tank and a second fan. The at least one submerged ultrafiltration unit is arranged in the membrane pool, and the water outlets of the submerged ultrafiltration units are connected to form the water outlet of the submerged ultrafiltration device; the water outlet of the submerged ultrafiltration device is connected with the inlet of the ultraviolet sterilizer in sequence through the sixth electric control valve, the water outlet pump, a first check valve, a twenty-first electric control valve and a seventh electric control valve; the water outlet pump is connected with the inlet of the backwashing tank in sequence through the first check valve, the twenty-first electric control valve and a twenty-second electric control valve, and is connected with the inlet of the secondary sodium addition tank in sequence through the first check valve, the twenty-first electric control valve and a twenty-third electric control valve; the outlet of the backwashing tank is connected with the water outlet of the submerged ultrafiltration device in sequence through a twenty-fourth electric control valve, a twenty-fifth electric control valve, the backwashing pump, a second check valve, a twenty-sixth electric control valve and a twenty-seventh electric control valve, and is connected with the subsequent emptying in sequence through the twenty-fourth electric control valve and a twenty-eighth electric control valve; the outlet of the secondary sodium addition tank is connected with the pipeline between the twenty-sixth electric control valve and the twenty-seventh electric control valve; the second fan is connected with the air inlet of the at least one submerged ultrafiltration unit; the outlet of the membrane pool is connected with the subsequent emptying through a twenty-ninth electric control valve, and the inlet of the membrane pool is the inlet of the submerged ultrafiltration device; the control unit is electrically connected with the twenty-first to twenty-ninth electric control valves, the backwashing pump and the second fan.

7. A system for treating the effluent from a marine farming operation as claimed in claim 6 wherein: The ultrafiltration membrane used by the at least one submerged ultrafiltration unit is a hollow fiber ultrafiltration membrane or a flat ceramic ultrafiltration membrane.

8. A system for treating the effluent from a marine farming operation as claimed in claim 7, characterised in that: The specifications of the hollow fiber ultrafiltration membrane are as follows: a molecular weight cut-off of 60000-150000D, a transmembrane pressure difference of 0.01-0.5bar and a flux of 10-30LMH; and the area of a single set of membrane group is 10-2600 square meters.

9. A system for treating the effluent from a marine farming operation as claimed in claim 7 wherein: The specifications of the flat ceramic ultrafiltration membrane are as follows: a molecular weight cut-off of 60000-150000D, a transmembrane pressure difference of 0.01-0.5bar and a flux of 10-30LMH; and the area of a single set of membrane group is 10-2600 square meters.

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