Treatment device for up-to-standard discharge of aquaculture wastewater

Abstract

The utility model discloses an aquaculture wastewater up-to-standard discharge treatment device which comprises a sludge storage tank, a solid-liquid separator, a stock solution tank, a regulating tank and an integrated aquaculture wastewater treatment device, the integrated culture wastewater treatment device comprises an up-flow anaerobic granular sludge treatment unit, an activated sludge treatment unit, a short-cut nitrification-anaerobic ammonia oxidation treatment unit and a contact oxidation treatment unit, wherein the short-cut nitrification-anaerobic ammonia oxidation treatment unit improves the sludge activity by forming hydroxyapatite carrier type anaerobic ammonia oxidation granular sludge, and realizes synchronous nitrogen removal and phosphorus recovery. The inclined tube assemblies and the hollow folded plate type precipitators are arranged in the units of the integrated treatment device, so that the precipitation water conservancy condition is improved, the precipitation effect is improved, and the effluent can meet the discharge standard of pollutants in the livestock and poultry industry. The integrated device has the advantages of compact structure, small occupied area, small aeration rate, low sludge yield and synchronous low-carbon nitrogen removal and phosphorus resource recovery.

Description

Technical Field

[0001] The utility model relates to the technical field of sewage treatment, and in particular to a device for treating aquaculture wastewater that meets discharge standards. Background Art

[0002] Intensive farming produces a large amount of livestock and poultry manure. In areas where supporting land is insufficient, aquaculture wastewater must be properly treated and disposed of to meet the "Livestock and Poultry Farming Pollutant Emission Standards" before it can be discharged.

[0003] Aquaculture wastewater is different from other types of wastewater and has typical "three high" characteristics: high suspended solids (3000-10000mg / L), high organic matter (10000-20000mg / L), and high ammonia nitrogen (300-1000mg / L). The aquaculture wastewater discharge standard requires that after the aquaculture wastewater is treated, the organic matter (COD) in the effluent should be less than 400mg / L, the suspended solids (SS) should be less than 200mg / L, and the ammonia nitrogen (NH4 + -N)<80mg / L, total phosphorus (TP)<8mg / L. It can be seen that the developed emission treatment process that meets the standards should be able to remove COD, SS, and NH4 + -N, and TP, and each index must achieve a high removal rate. At the same time, the developed process must meet the actual needs of energy saving and low carbon, easy operation, and saving floor space.

[0004] At present, the traditional treatment method usually draws on the urban sewage treatment process, and adopts the process mainly based on anaerobic-aerobic alternation-biochemical pond treatment. This kind of process has the disadvantages of many treatment units, long process, large floor space, large aeration volume, high energy consumption, and high sludge production. In addition, some existing technologies use anaerobic membrane treatment process, which is difficult to operate and manage because the membrane is easy to clog; in addition, the membrane is a consumable material and needs to be replaced regularly, resulting in increased operating costs.

[0005] In view of this, the present utility model is proposed. Utility Model Content

[0006] The purpose of the utility model is to provide a treatment device for aquaculture wastewater that meets the discharge standards, and the effluent can meet the "Pollutant Emission Standard for Livestock and Poultry Farming" (GB18596-2001) and the "Farmland Irrigation Water Quality Standard" (GB 5084-2021). The utility model has the advantages of compact structure, small footprint, small aeration volume, low energy consumption, small sludge production, low carbon denitrification and simultaneous phosphorus recovery.

[0007] In order to achieve the above-mentioned purpose of the utility model, the following technical solutions are adopted:

[0008] The first aspect of the utility model provides a device for treating aquaculture wastewater that meets the discharge standards, the device comprising a sludge storage tank, a solid-liquid separator, a raw liquid tank, a regulating tank and an integrated aquaculture wastewater treatment device, the integrated aquaculture wastewater treatment device comprising an upflow anaerobic granular sludge treatment unit, an activated sludge treatment unit, a short-range nitrification-anaerobic ammonia oxidation treatment unit and a contact oxidation treatment unit;

[0009] A first submersible sewage pump is provided at the bottom of the mud storage tank, and the outlet of the first submersible sewage pump is connected to the solid-liquid separator; the liquid outlet of the solid-liquid separator is connected to the raw liquid tank;

[0010] A second submersible sewage pump is arranged at the bottom of the raw liquid tank, the outlet of the second submersible sewage pump is connected to the regulating tank, the regulating tank is connected to the upflow anaerobic granular sludge treatment unit and a partition and a heating rod are arranged inside the regulating tank;

[0011] The upflow anaerobic granular sludge treatment unit is provided with a first water inlet, a first emptying port and a first mud discharge port at the bottom, a three-phase separator and a first inclined pipe assembly above the three-phase separator are provided in the middle, and an exhaust hole and a water collecting tank and a first drainage tank connected to the water collecting tank are provided at the top; an exhaust pipe is provided at the top of the upflow anaerobic granular sludge treatment unit, the first water inlet is connected to the regulating tank through the water inlet pipe; the first mud discharge port is connected to the mud storage tank, and the first drainage tank is connected to the activated sludge treatment unit through a water pipe;

[0012] The bottom of the activated sludge treatment unit is provided with a first group of aeration ports, a second emptying port and a second mud discharge port, a first inclined plate is provided on one side of the middle part, and a first hollow folded plate extending downward is provided on the upper part, the first hollow folded plate, the first inclined plate and the inner wall of the activated sludge treatment unit form a first closed space, the outer wall of the upper part of the first hollow folded plate is provided with a second water inlet, the lower part is open and a first opening is provided between the first inclined plate and the first inclined plate; a second inclined pipe assembly is provided in the middle part of the first closed space, a third mud discharge port is provided on the side wall of the bottom, and a second drainage trough is provided on the upper part, and the second drainage trough is connected with the short-range nitrification-anaerobic ammonia oxidation treatment unit through a water pipe;

[0013] The bottom of the short-range nitrification-anaerobic ammonium oxidation treatment unit is provided with a second group of aeration ports, a third emptying port and a fourth mud discharge port, a second inclined plate is provided on one side of the middle part, and a second hollow folded plate extending downward is provided on the upper part, the second hollow folded plate, the second inclined plate and the inner wall of the short-range nitrification-anaerobic ammonium oxidation treatment unit form a second closed space, the outer wall of the upper part of the second hollow folded plate is provided with a third water inlet, the lower part is open and a second opening is provided between the second inclined plate; the side wall of the bottom of the second closed space is provided with a fifth mud discharge port, and the upper part is provided with a third drainage trough, and the third drainage trough is connected with the contact oxidation treatment unit through a water pipe;

[0014] A third group of aeration ports, a fourth drain port and a sixth mud drain port are arranged at the bottom of the contact oxidation treatment unit, a third inclined plate is arranged on one side of the middle part, and a third hollow folded plate extending downward is arranged at the upper part, the third hollow folded plate, the third inclined plate and the inner wall of the contact oxidation treatment unit form a third closed space, a fourth water inlet is arranged on the outer wall of the upper part of the third hollow folded plate, the lower part is open and a third opening is arranged between the third inclined plate; a seventh mud drain port is arranged on the side wall of the bottom of the third closed space, and a fourth water drain port is arranged at the upper part.

[0015] Preferably, the integrated aquaculture wastewater treatment device also includes a circulation pump, the inlet of which is connected to the outer wall above the three-phase separator in the upflow anaerobic granular sludge treatment unit through a water pipe, and the outlet is connected to the water inlet pipe.

[0016] Preferably, a filler is further provided in the contact oxidation treatment unit, and the filler is located in the middle of the contact oxidation treatment unit and on one side of the third closed space.

[0017] Preferably, the second mud discharge port, the third mud discharge port, the fourth mud discharge port, the fifth mud discharge port, the sixth mud discharge port and the seventh mud discharge port are respectively connected to the water inlet pipe through the first mud discharge pump.

[0018] Preferably, the aquaculture wastewater discharge treatment device further includes a first dosing tank and a second dosing tank, the first dosing tank is connected to the short-range nitrification-anaerobic ammonia oxidation treatment unit, and the second dosing tank is connected to the solid-liquid separator.

[0019] The second aspect of the utility model provides a method for treating aquaculture wastewater based on the aquaculture wastewater discharge treatment device, comprising the following steps:

[0020] (a) The aquaculture manure is discharged into a sludge storage tank, and then the aquaculture manure is pumped into a solid-liquid separator for solid-liquid separation, and the separated aquaculture wastewater is stored in a raw liquid tank;

[0021] (b) The aquaculture wastewater in the stock liquid tank is pumped into the regulating tank, and the anaerobic granular sludge is inoculated at the bottom of the upflow anaerobic granular sludge treatment unit. Then, if the temperature of the aquaculture wastewater in the regulating tank is lower than 10°C, it is heated and then pumped into the upflow anaerobic granular sludge treatment unit for anaerobic treatment. The circulation pump is started intermittently to keep the anaerobic granular sludge in a fluid state to prevent the anaerobic granular sludge from hardening and affecting the anaerobic treatment effect.

[0022] (c) inoculating the first activated sludge at the bottom of the activated sludge treatment unit, and then discharging the effluent from the upflow anaerobic granular sludge treatment unit into the activated sludge treatment unit through a water pipe connected to the first drainage tank for treatment, and aerating through the first set of aeration ports;

[0023] (d) inoculating nitrification sludge and anaerobic ammonium oxidation granular sludge at the bottom of the short-cut nitrification-anaerobic ammonium oxidation treatment unit, and then discharging the effluent from the activated sludge treatment unit into the short-cut nitrification-anaerobic ammonium oxidation treatment unit through a water pipe connected to the second drainage tank for treatment, while adding calcium chloride through the first dosing tank and aerating through the second set of aeration ports;

[0024] (e) A second activated sludge is inoculated at the bottom of the contact oxidation treatment unit, and then the effluent from the short-cut nitrification-anaerobic ammonia oxidation treatment unit is discharged into the contact oxidation treatment unit through a water pipe connected to the third drainage trough for treatment, and aeration is performed through the third set of aeration ports at the same time, and finally, the treated water is discharged through the fourth drainage trough.

[0025] Preferably, in step (b), the inoculation amount of the anaerobic granular sludge is half of the volume below the three-phase separator in the upflow anaerobic granular sludge treatment unit;

[0026] The hydraulic retention time in the upflow anaerobic granular sludge treatment unit is 2 days.

[0027] Preferably, in step (c), the first activated sludge is activated sludge from a municipal sewage treatment plant; the inoculation amount of the first activated sludge is half of the effective volume inside the activated sludge treatment unit;

[0028] The hydraulic retention time in the activated sludge treatment unit is 2 days;

[0029] The aeration volume per cubic meter of wastewater is 20 to 202 m 3 .

[0030] Preferably, in step (d), the nitrification sludge is sludge from a nitrification tank in a municipal sewage treatment plant, and the inoculation amount is 0.2 to 0.3 times the effective volume of the biological reaction zone of the short-cut nitrification-anaerobic ammonium oxidation unit; the inoculation amount of the anaerobic ammonium oxidation granular sludge = Q(C 进 -C 出 ) / 1000S, where Q is the amount of water treated, m3 / d,C 进 is the influent ammonia nitrogen concentration, C 出 is the required effluent ammonia nitrogen concentration, mg / L; S is the activity of the inoculated anammox granular sludge, Kg N / Kg VSS.d; the amount of calcium chloride added is that the calcium ion concentration does not exceed 100 mg / L; the granular sludge obtained by the short-range nitrification-anammox unit is the anammox granular sludge generated based on hydroxyapatite, which can be recycled as phosphate fertilizer;

[0031] The DO in the short-cut nitrification-anaerobic ammonium oxidation treatment unit does not exceed 0.5 mg / L;

[0032] The hydraulic retention time in the short-cut nitrification-anaerobic ammonium oxidation treatment unit is 1 day;

[0033] The aeration volume per cubic meter of wastewater is 5.52~91.2m 3 .

[0034] Preferably, in step (e), the second activated sludge is activated sludge from a municipal sewage treatment plant; the inoculation amount of the second activated sludge is 0.4 to 0.6 times the effective volume of the reaction zone of the contact oxidation unit;

[0035] The hydraulic retention time in the contact oxidation treatment unit is 1 day;

[0036] The aeration volume per cubic meter of wastewater is 2.7 to 20.4 m 3 .

[0037] Compared with the prior art, the beneficial effects of the present invention include at least:

[0038] The utility model firstly adopts the method of setting an inclined tube assembly in the upflow anaerobic granular sludge treatment unit to strengthen the removal of COD and SS, reduce the organic load in the influent of the activated sludge treatment unit, thereby improving the effluent quality of the activated sludge treatment unit, and then facilitating the improvement of the denitrification efficiency of the short-range nitrification-anaerobic ammonium oxidation unit. Secondly, in the utility model, the aquaculture wastewater integrated treatment device realizes synchronous denitrification and phosphorus recovery through the hydroxyapatite carrier type anaerobic ammonium oxidation granular sludge formed in the short-range nitrification-anaerobic ammonium oxidation treatment unit; at the same time, the hydroxyapatite carrier type anaerobic ammonium oxidation granular sludge has the characteristics of high precipitation efficiency, which can prevent the loss of the anaerobic ammonium oxidation granular sludge with slow growth, thereby improving the denitrification effect of anaerobic ammonium oxidation, and finally achieving the purpose of meeting the discharge standards. Finally, in the utility model, the aquaculture wastewater integrated treatment device is provided with an inclined tube assembly and a hollow folded plate precipitator for the upflow anaerobic granular sludge treatment unit, the activated sludge treatment unit, the short-range nitrification-anaerobic ammonium oxidation treatment unit and the contact oxidation treatment unit, thereby improving the precipitation hydraulic conditions and the precipitation effect. Specifically: In the utility model aquaculture wastewater integrated treatment device, the hollow folded plates of the precipitators of the activated sludge unit, the short-range nitrification-anaerobic ammonia oxidation treatment unit and the contact oxidation treatment unit are set to a double-layer structure with a high inner layer and a low outer layer, and the water inlet of the precipitator passes through the water inlet hole on the outer wall and flows downward along the inner and outer wall sandwich layer and enters from the bottom of the precipitator, thereby reducing the disturbance of the water flow in the precipitation process, improving the precipitation hydraulic conditions, and improving the precipitation effect. In addition, in the utility model aquaculture wastewater integrated treatment device, the inclined plate assembly is set in the precipitator of the upflow anaerobic granular sludge treatment unit and the activated sludge treatment unit to enhance the water discharge effect. The utility model integrated treatment device has the advantages of compact structure, small footprint, simultaneous denitrification and phosphorus recovery, small aeration volume, and small sludge production. The effluent can meet the "Pollutant Emission Standard for Livestock and Poultry Breeding Industry" (GB18596-2001) and the "Agricultural Irrigation Water Quality Standard" (GB 5084-2021). BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the specific implementation of the utility model or the technical solution in the prior art, the following is a brief introduction to the drawings required for the specific implementation or the prior art description. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, each element or part is not necessarily drawn according to the actual scale.

[0040] Figure 1 It is a schematic diagram of the structure of the aquaculture wastewater discharge treatment device that meets the discharge standards in an embodiment of the utility model. DETAILED DESCRIPTION

[0041] The following embodiments of the technical solution of the utility model are described in detail in combination with the embodiments. The following embodiments are only used to more clearly illustrate the technical solution of the utility model, and are therefore only used as examples, and cannot be used to limit the protection scope of the utility model.

[0042] It should be noted that, unless otherwise specified, the technical terms or scientific terms used in this application should have the common meanings understood by technicians in the field to which the utility model belongs.

[0043] The raw materials used in the following examples are as follows:

[0044] Anaerobic granular sludge: derived from the stable UASB biogas project reactor;

[0045] The first activated sludge and the second activated sludge are from the secondary sedimentation tank of Yangling Wastewater Treatment Plant;

[0046] Nitrification sludge: from the nitrification pool of Yangling sewage treatment plant;

[0047] Anaerobic ammonium oxidation granular sludge: The activity of anaerobic ammonium oxidation granular sludge is 0.3kgN / kg VSS.d, which comes from the stably operating anaerobic ammonium oxidation reactor.

[0048] The utility model provides a device for treating aquaculture wastewater that meets the discharge standards. Figure 1 As shown, the aquaculture wastewater discharge treatment device comprises a sludge storage tank 1, a solid-liquid separator 2, a raw liquid tank 3, a regulating tank 4 and an integrated aquaculture wastewater treatment device, and the integrated aquaculture wastewater treatment device comprises an upflow anaerobic granular sludge treatment unit 5, an activated sludge treatment unit 6, a short-range nitrification-anaerobic ammonia oxidation treatment unit 7, a contact oxidation treatment unit 8, a first dosing tank 9 and a second dosing tank 10;

[0049] A first submersible sewage pump 11 is provided at the bottom of the mud storage tank 1, and a mud outlet pipe is connected to the outlet of the first submersible sewage pump 11, and the mud outlet pipe is connected to the mud inlet of the solid-liquid separator 2; a sampling port is provided at the bottom of the mud storage tank;

[0050] The outlet of the second dosing tank 10 is connected to the inlet of the first dosing pump 101, the outlet of the first dosing pump 101 is connected to the solid-liquid separator 2 through a water pipe, and the liquid outlet of the solid-liquid separator 2 is connected to the stock liquid tank 3 through a pipeline;

[0051] A second submersible sewage pump 31 is provided at the bottom of the raw liquid pool 3, the outlet of the second submersible sewage pump 31 is connected to the outlet pipe, the other end of the outlet pipe is connected to the first water inlet pump 32 and a valve is provided on the outlet pipe, the outlet of the first water inlet pump 32 is connected to the regulating pool 4 through a water pipe and a valve is provided on the water pipe;

[0052] The regulating tank 4 is connected to the upflow anaerobic granular sludge treatment unit 5 through a water pipe, and a second water inlet pump 41 and a first flow meter 42 are arranged between the two. A partition (not shown) and a heating rod 43 are arranged inside the regulating tank 4.

[0053] The upflow anaerobic granular sludge treatment unit 5 is provided with a first water inlet 51, a first emptying port 52 and a first mud discharge port 53 at the bottom, a three-phase separator 54 and a first inclined pipe assembly 55 above the three-phase separator 54 are provided in the middle, and an exhaust hole 56 and a water collecting tank 57 and a first drainage tank 58 connected to the water collecting tank 57 are provided at the top; an exhaust pipe is provided at the top of the upflow anaerobic granular sludge treatment unit 5 for connecting to the exhaust hole 56 (not shown in the figure), the first water inlet 51 is connected to the regulating tank 4 through the water inlet pipe 59; the first mud discharge port 53 is connected to the mud storage tank 1 and a second mud discharge pump 12 and a second flowmeter 13 are provided therebetween, and the first drainage tank 58 is connected to the activated sludge treatment unit 6 through a water pipe; the air outlet of the three-phase separator 54 is connected to the exhaust hole 56;

[0054] The bottom of the activated sludge treatment unit 6 is provided with a first group of aeration ports 61, a second emptying port 62 and a second mud discharge port 63, a first inclined plate 64 is provided on one side of the middle part, and a first hollow folded plate 65 extending downward is provided on the upper part. The first hollow folded plate 65, the first inclined plate 64 and the inner wall of the activated sludge treatment unit 6 form a first closed space 66, a second water inlet 67 is provided on the outer wall of the upper part of the first hollow folded plate 65, and the lower part is open and a first opening 68 is provided between the first inclined plate 64 and the first inclined plate 64; a second inclined pipe assembly 69 is provided in the middle part of the first closed space 66, a third mud discharge port 610 is provided on the side wall of the bottom, and a second drainage trough 611 is provided on the upper part, and the second drainage trough 611 is connected to the short-range nitrification-anaerobic ammonia oxidation treatment unit 7 through a water pipe;

[0055] The bottom of the short-range nitrification-anaerobic ammonium oxidation treatment unit 7 is provided with a second group of aeration ports 71, a third emptying port 72 and a fourth mud discharge port 73, a second inclined plate 74 is provided on one side of the middle part, and a second hollow folded plate 75 extending downward is provided on the upper part. The second hollow folded plate 75, the second inclined plate 74 and the inner wall of the short-range nitrification-anaerobic ammonium oxidation treatment unit 7 form a second closed space 76, and a third water inlet 77 is provided on the outer wall of the upper part of the second hollow folded plate, and the lower part is open and a second opening 78 is provided between the second inclined plate 74 and the second closed space 76; a fifth mud discharge port 710 is provided on the side wall of the bottom of the second closed space 76, and a third drainage trough 711 is provided on the upper part, and the third drainage trough 711 is connected to the contact oxidation treatment unit 8 through a water pipe;

[0056] The outlet of the first dosing tank 9 is connected to the inlet of the second dosing pump 91, and the outlet of the second dosing pump 91 is connected to the short-range nitrification-anaerobic ammonium oxidation treatment unit 7 through a water pipe;

[0057] A third group of aeration ports 81, a fourth drain port 82 and a sixth mud drain port 83 are provided at the bottom of the contact oxidation treatment unit 8, a third inclined plate 84 is provided on one side of the middle part, and a third hollow folded plate 85 extending downward is provided on the upper part. The third hollow folded plate 85, the third inclined plate 84 and the inner wall of the contact oxidation treatment unit 8 form a third closed space 86, a fourth water inlet 87 is provided on the outer wall of the upper part of the third hollow folded plate 85, the lower part is open and a third opening 88 is provided between the third inclined plate 84; a seventh mud drain port 810 is provided on the side wall of the bottom of the third closed space, and a fourth drainage ditch 811 is provided on the upper part.

[0058] In one embodiment, the integrated aquaculture wastewater treatment device further includes a circulation pump 10, the inlet of the circulation pump 10 is connected to the outer wall above the three-phase separator 54 in the upflow anaerobic granular sludge treatment unit 5 through a water pipe, and the outlet is connected to the water inlet pipe 59, and a third flow meter 14 is provided between the two. By providing the circulation pump 10, internal circulation can be achieved, and the sludge can be put into a fluidized state, which better promotes anaerobic treatment.

[0059] In one embodiment, the contact oxidation treatment unit 8 is further provided with a filler 812, which is located in the middle of the contact oxidation treatment unit 8 and on one side of the third closed space 86. The setting of the filler 812 can provide a fixed carrier for the microorganisms, which is conducive to improving the microorganism treatment effect.

[0060] In one embodiment, the second mud discharge port 63 , the third mud discharge port 610 , the fourth mud discharge port 73 , the fifth mud discharge port 710 , the sixth mud discharge port 83 and the seventh mud discharge port 810 are respectively connected to the water inlet pipe 59 through the first mud discharge pump 16 and a fourth flow meter 15 is arranged between the first mud discharge pump 16 and the water inlet pipe 59 .

[0061] In one embodiment, the first water inlet 51 at the bottom of the upflow anaerobic granular sludge treatment unit 5 is connected to a plurality of water distribution branches (not shown in the figure), each of which is provided with a separate valve, and each water distribution branch corresponds to a water distribution port, and the average water distribution area of ​​each water distribution port is 1m 2 Calculation. Each water outlet faces downward, so that the sludge particles are stirred first, and then when the jet returns to move upward after being blocked, the already stirred sludge particles are driven to float, and the sewage can keep flowing upward at a uniform speed or suspended in the sewage, which improves the fermentation and treatment conditions; the smaller the nozzle diameter, the higher the flow rate, the more obvious the stirring effect on the granular sludge, but the smaller the diameter, the greater the system resistance.

[0062] In one embodiment, the diameter of the inclined tube of the first inclined tube assembly 55 is 100-120 mm.

[0063] In one embodiment, a microporous aerator (disc or corundum) may be used during the aeration process, with a service area of ​​0.25-0.55m 2 / , set the number of aerators according to the area of ​​activated sludge unit.

[0064] In one embodiment, the inner walls of the first hollow folded plate 65, the second hollow folded plate 75 and the third hollow folded plate 85 are higher than the outer walls. Another embodiment of the utility model provides a method for treating aquaculture wastewater based on the above-mentioned aquaculture wastewater standard discharge treatment device, comprising the following steps:

[0065] (a) draining the aquaculture waste into a sludge storage tank 1, then pumping the aquaculture waste into a solid-liquid separator 2 for solid-liquid separation, and adding polyacrylamide to the solid-liquid separator 2 through a second dosing tank 9, separating the aquaculture wastewater into a stock liquid tank 3 for storage; the amount of polyacrylamide added is 0.5% (based on the solid content of the waste);

[0066] (b) The aquaculture wastewater in the stock liquid tank 3 is pumped into the regulating tank 4, and the anaerobic granular sludge is inoculated at the bottom of the upflow anaerobic granular sludge treatment unit 5. Then, if the temperature of the aquaculture wastewater in the regulating tank 4 is lower than 10°C (if the temperature of the aquaculture wastewater is higher than 10°C, no heating is required), it is heated and then pumped into the upflow anaerobic granular sludge treatment unit 5 for anaerobic treatment, and the circulation pump is started intermittently to circulate the aquaculture wastewater to keep the anaerobic granular sludge in a fluid state; the inoculation amount of the anaerobic granular sludge is half of the volume below the three-phase separator in the upflow anaerobic granular sludge treatment unit; the hydraulic retention time is 2d;

[0067] (c) Inoculating the first activated sludge at the bottom of the activated sludge treatment unit 6, and then discharging the effluent from the upflow anaerobic granular sludge treatment unit 5 into the activated sludge treatment unit 6 for treatment through a water pipe connected to the first drainage trough 58, and aerating through the first set of aeration ports 61; the first activated sludge is the activated sludge from the urban sewage treatment plant; the inoculation amount of the first activated sludge is half of the effective volume inside the activated sludge treatment unit; the hydraulic retention time is 2 days; the aeration volume per cubic meter of wastewater is 100m 3 ;

[0068] (d) Inoculate nitrification sludge and anaerobic ammonium oxidation granular sludge at the bottom of the short-cut nitrification-anaerobic ammonium oxidation treatment unit 7, then discharge the effluent from the activated sludge treatment unit 6 into the short-cut nitrification-anaerobic ammonium oxidation treatment unit 7 through a water pipe connected to the second drainage tank 611 for treatment, and at the same time add calcium chloride through the first dosing tank 10 and aerate through the second set of aeration ports; the inoculation amount of nitrification sludge is 0.25 times the effective volume of the biological reaction zone of the short-cut nitrification-anaerobic ammonium oxidation unit; the inoculation amount of anaerobic ammonium oxidation granular sludge = Q(C 进 -C 出) / 1000S, where Q is the treated water volume, m3 / d, C 进 is the influent ammonia nitrogen concentration, C 出 is the required effluent ammonia nitrogen concentration, mg / L; S is the activity of the inoculated anaerobic ammonium oxidation granular sludge, Kg N / Kg VSS.d; the treatment time is 1 day; the aeration volume per cubic meter of wastewater is 50m 3 ; Calcium chloride is added to a calcium ion concentration of 80 mg / L; DO in the short-cut nitrification-anaerobic ammonium oxidation treatment unit does not exceed 0.5 mg / L;

[0069] (e) The second activated sludge is inoculated at the bottom of the contact oxidation treatment unit 8, and then the effluent from the short-range nitrification-anaerobic ammonium oxidation treatment unit 7 is discharged into the contact oxidation treatment unit 8 through a water pipe connected to the third drainage trough 711 for treatment, and aerated through the third set of aeration ports at the same time, and finally, the treated water is discharged through the fourth drainage trough 811; the inoculation amount of the second activated sludge is 0.5 times the effective volume of the reaction zone of the contact oxidation unit; the hydraulic retention time is 1d; the aeration volume per cubic meter of wastewater is 10m 3 .

[0070] The pig breeding wastewater is treated by using the breeding wastewater treatment method of the breeding wastewater discharge treatment device that meets the standards;

[0071] The indicators of pig farming wastewater before treatment and the effluent indicators after treatment in each unit are shown in Table 1:

[0072] Table 1

[0073]

[0074] It can be seen that the above treatment method of the present application can effectively remove COD, SS, TN and NH4 in aquaculture wastewater. + -N.

[0075] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. These modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the utility model, and they should all be included in the scope of the claims and specification of the utility model.

Claims

1. A device for treating aquaculture wastewater that meets discharge standards, characterized in that: The aquaculture wastewater discharge treatment device comprises a sludge storage tank, a solid-liquid separator, a raw liquid tank, a regulating tank and an integrated aquaculture wastewater treatment device, wherein the integrated aquaculture wastewater treatment device comprises an upflow anaerobic granular sludge treatment unit, an activated sludge treatment unit, a short-range nitrification-anaerobic ammonium oxidation treatment unit and a contact oxidation treatment unit; A first submersible sewage pump is provided at the bottom of the mud storage tank, and the outlet of the first submersible sewage pump is connected to the solid-liquid separator; the liquid outlet of the solid-liquid separator is connected to the raw liquid tank; A second submersible sewage pump is arranged at the bottom of the raw liquid tank, the outlet of the second submersible sewage pump is connected to the regulating tank, the regulating tank is connected to the upflow anaerobic granular sludge treatment unit and a partition and a heating rod are arranged inside the regulating tank; The upflow anaerobic granular sludge treatment unit is provided with a first water inlet, a first emptying port and a first mud discharge port at the bottom, a three-phase separator and a first inclined pipe assembly above the three-phase separator are provided in the middle, and an exhaust hole and a water collecting tank and a first drainage tank connected to the water collecting tank are provided at the top; an exhaust pipe is provided at the top of the upflow anaerobic granular sludge treatment unit, the first water inlet is connected to the regulating tank through the water inlet pipe; the first mud discharge port is connected to the mud storage tank, and the first drainage tank is connected to the activated sludge treatment unit through a water pipe; The bottom of the activated sludge treatment unit is provided with a first group of aeration ports, a second emptying port and a second mud discharge port, a first inclined plate is provided on one side of the middle part, and a first hollow folded plate extending downward is provided on the upper part, the first hollow folded plate, the first inclined plate and the inner wall of the activated sludge treatment unit form a first closed space, the outer wall of the upper part of the first hollow folded plate is provided with a second water inlet, the lower part is open and a first opening is provided between the first inclined plate and the first inclined plate; a second inclined pipe assembly is provided in the middle part of the first closed space, a third mud discharge port is provided on the side wall of the bottom, and a second drainage trough is provided on the upper part, and the second drainage trough is connected with the short-range nitrification-anaerobic ammonia oxidation treatment unit through a water pipe; The bottom of the short-range nitrification-anaerobic ammonium oxidation treatment unit is provided with a second group of aeration ports, a third emptying port and a fourth mud discharge port, a second inclined plate is provided on one side of the middle part, and a second hollow folded plate extending downward is provided on the upper part, the second hollow folded plate, the second inclined plate and the inner wall of the short-range nitrification-anaerobic ammonium oxidation treatment unit form a second closed space, the outer wall of the upper part of the second hollow folded plate is provided with a third water inlet, the lower part is open and a second opening is provided between the second inclined plate; the side wall of the bottom of the second closed space is provided with a fifth mud discharge port, and the upper part is provided with a third drainage trough, and the third drainage trough is connected with the contact oxidation treatment unit through a water pipe; A third group of aeration ports, a fourth drain port and a sixth mud drain port are arranged at the bottom of the contact oxidation treatment unit, a third inclined plate is arranged on one side of the middle part, and a third hollow folded plate extending downward is arranged at the upper part, the third hollow folded plate, the third inclined plate and the inner wall of the contact oxidation treatment unit form a third closed space, a fourth water inlet is arranged on the outer wall of the upper part of the third hollow folded plate, the lower part is open and a third opening is arranged between the third inclined plate; a seventh mud drain port is arranged on the side wall of the bottom of the third closed space, and a fourth water drain port is arranged at the upper part.

2. The aquaculture wastewater discharge treatment device according to claim 1 is characterized in that: The integrated aquaculture wastewater treatment device also includes a circulation pump, the inlet of which is connected to the outer wall above the three-phase separator in the upflow anaerobic granular sludge treatment unit through a water pipe, and the outlet of which is connected to the water inlet pipe.

3. The aquaculture wastewater discharge treatment device according to claim 1 is characterized in that: The contact oxidation treatment unit is also provided with a filler, and the filler is located in the middle of the contact oxidation treatment unit and on one side of the third closed space.

4. The aquaculture wastewater discharge treatment device according to claim 1 is characterized in that: The second mud discharge port, the third mud discharge port, the fourth mud discharge port, the fifth mud discharge port, the sixth mud discharge port and the seventh mud discharge port are respectively connected to the water inlet pipe through the first mud discharge pump.

5. The aquaculture wastewater discharge treatment device according to claim 1 is characterized in that: The aquaculture wastewater discharge treatment device further includes a first dosing tank and a second dosing tank, wherein the first dosing tank is connected to the short-range nitrification-anaerobic ammonia oxidation treatment unit, and the second dosing tank is connected to the solid-liquid separator.

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