CN117185513A - Magnetic coagulation coupling biological strengthening treatment method for eel culture wastewater - Google Patents
Magnetic coagulation coupling biological strengthening treatment method for eel culture wastewater Download PDFInfo
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- CN117185513A CN117185513A CN202310472852.XA CN202310472852A CN117185513A CN 117185513 A CN117185513 A CN 117185513A CN 202310472852 A CN202310472852 A CN 202310472852A CN 117185513 A CN117185513 A CN 117185513A
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- 238000005345 coagulation Methods 0.000 title claims abstract description 39
- 230000015271 coagulation Effects 0.000 title claims abstract description 39
- 238000000034 method Methods 0.000 title claims abstract description 35
- 239000002351 wastewater Substances 0.000 title claims abstract description 33
- 230000008878 coupling Effects 0.000 title claims abstract description 15
- 238000010168 coupling process Methods 0.000 title claims abstract description 15
- 238000005859 coupling reaction Methods 0.000 title claims abstract description 15
- 238000005728 strengthening Methods 0.000 title claims abstract description 15
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 38
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims abstract description 36
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 36
- 239000011574 phosphorus Substances 0.000 claims abstract description 36
- 238000004062 sedimentation Methods 0.000 claims abstract description 31
- 230000001546 nitrifying effect Effects 0.000 claims abstract description 27
- 239000010802 sludge Substances 0.000 claims abstract description 25
- 241000894006 Bacteria Species 0.000 claims abstract description 22
- MMDJDBSEMBIJBB-UHFFFAOYSA-N [O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O.[NH6+3] Chemical compound [O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O.[NH6+3] MMDJDBSEMBIJBB-UHFFFAOYSA-N 0.000 claims abstract description 17
- 239000006247 magnetic powder Substances 0.000 claims abstract description 11
- 238000010992 reflux Methods 0.000 claims abstract description 11
- 238000000926 separation method Methods 0.000 claims abstract description 10
- 239000006228 supernatant Substances 0.000 claims abstract description 10
- 238000007885 magnetic separation Methods 0.000 claims abstract description 9
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 claims abstract description 8
- 238000006243 chemical reaction Methods 0.000 claims abstract description 5
- 238000007599 discharging Methods 0.000 claims abstract description 5
- 239000007788 liquid Substances 0.000 claims abstract description 5
- 238000004064 recycling Methods 0.000 claims abstract description 5
- 239000000945 filler Substances 0.000 claims description 11
- 238000004065 wastewater treatment Methods 0.000 claims description 10
- 235000014113 dietary fatty acids Nutrition 0.000 claims description 9
- 229930195729 fatty acid Natural products 0.000 claims description 9
- 239000000194 fatty acid Substances 0.000 claims description 9
- 150000004665 fatty acids Chemical class 0.000 claims description 9
- 239000008394 flocculating agent Substances 0.000 claims description 7
- 238000005189 flocculation Methods 0.000 claims description 6
- 230000016615 flocculation Effects 0.000 claims description 6
- 238000005273 aeration Methods 0.000 claims description 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 4
- 239000012530 fluid Substances 0.000 claims description 4
- 230000014759 maintenance of location Effects 0.000 claims description 4
- 229910052760 oxygen Inorganic materials 0.000 claims description 4
- 239000001301 oxygen Substances 0.000 claims description 4
- AZDRQVAHHNSJOQ-UHFFFAOYSA-N alumane Chemical class [AlH3] AZDRQVAHHNSJOQ-UHFFFAOYSA-N 0.000 claims description 3
- 239000000701 coagulant Substances 0.000 claims description 3
- 230000001112 coagulating effect Effects 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims description 3
- 229920000620 organic polymer Polymers 0.000 claims description 3
- 230000008569 process Effects 0.000 abstract description 16
- 230000000593 degrading effect Effects 0.000 abstract description 2
- 238000005516 engineering process Methods 0.000 abstract description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 16
- 230000000694 effects Effects 0.000 description 10
- 229910052757 nitrogen Inorganic materials 0.000 description 8
- 230000000052 comparative effect Effects 0.000 description 3
- 238000001556 precipitation Methods 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- CKUAXEQHGKSLHN-UHFFFAOYSA-N [C].[N] Chemical compound [C].[N] CKUAXEQHGKSLHN-UHFFFAOYSA-N 0.000 description 1
- JXBAVRIYDKLCOE-UHFFFAOYSA-N [C].[P] Chemical compound [C].[P] JXBAVRIYDKLCOE-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000012851 eutrophication Methods 0.000 description 1
- 239000011259 mixed solution Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 description 1
- 239000005416 organic matter Substances 0.000 description 1
- 230000033116 oxidation-reduction process Effects 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)
Abstract
The invention relates to a magnetic coagulation coupling biological strengthening treatment method for eel culture wastewater, which comprises the following steps: s1, enabling wastewater to enter an anaerobic tank, degrading organic matters in the water, and absorbing and storing the organic matters by denitrifying phosphorus removal bacteria; s2, the effluent of the anaerobic tank enters a middle sedimentation tank for mud-water separation, supernatant enters a nitrifying tank, nitrifying bacteria are utilized for nitrifying reaction, and ammonia nitrogen in the water is converted into nitrate nitrogen; the settled sludge enters an anoxic tank; s3, enabling the effluent of the nitrification tank to enter an anoxic tank, and enabling denitrifying phosphorus removal bacteria in the anoxic tank to synchronously remove nitrate nitrogen and phosphorus by taking the nitrate nitrogen as an electron acceptor; s4, feeding effluent of the anoxic tank into a coagulation tank, adding flocculant and magnetic powder, and strengthening dephosphorization; s5, enabling effluent of the coagulation tank to enter a sedimentation tank for solid-liquid separation, and discharging supernatant reaching the standard; and (3) partially refluxing the magnetic-containing sludge to the anaerobic tank, partially entering the magnetic separation device, recycling the separated magnetic powder to the coagulation tank, and dehydrating and transporting the separated non-magnetic sludge. The invention couples the biological denitrification and dephosphorization process with the magnetic coagulation technology, and improves the denitrification and dephosphorization efficiency.
Description
Technical Field
The invention relates to the technical field of wastewater treatment, in particular to a magnetic coagulation coupling biological strengthening treatment method for eel culture wastewater.
Background
Excessive discharge of nitrogen, phosphorus and the like in eel raising wastewater can cause serious water eutrophication phenomenon, so that the eel raising wastewater needs to be effectively removed before being discharged.
In the conventional ammonia nitrogen-containing wastewater treatment process selection, most of the processes adopt biological nitrogen and phosphorus removal processes based on anaerobic-anoxic-aerobic, but organic matters are needed as donors in the processes of nitrogen removal and phosphorus removal, so that the requirements on the organic matters in raw water are higher. Under the condition of insufficient carbon sources in sewage, denitrification and anaerobic dephosphorization compete for the carbon sources, so that the denitrification and dephosphorization effects are difficult to ensure simultaneously. Because the organic matter content of eel raising waste water is low, the carbon-nitrogen ratio and the carbon-phosphorus ratio in raw water are low, the traditional biological nitrogen and phosphorus removal process has the problems of low nitrogen and phosphorus removal efficiency and the like when being applied to eel raising waste water treatment. In the actual treatment process, strict effluent standard is still difficult to meet by means of simple biological treatment, so that the coagulating sedimentation process is often added in the actual engineering, but the method has the problems of large occupied area, unstable dephosphorization effect, large dosage of the agent, poor denitrification effect and the like.
Therefore, the novel economic and efficient eel raising wastewater treatment process is developed, the denitrification and dephosphorization effects are enhanced, the low-cost standard emission of eel raising wastewater is realized, and the novel eel raising wastewater treatment process has important practical and scientific significance.
Disclosure of Invention
The technical problems to be solved by the invention are as follows: the invention provides a magnetic coagulation coupling biological strengthening treatment method for eel culture wastewater, which solves the problems of low efficiency, high cost and unstable effect of treating eel culture wastewater by the existing biochemical denitrification and dephosphorization process.
In order to solve the technical problems, the invention adopts the following technical scheme:
the invention provides a magnetic coagulation coupling biological strengthening treatment method for eel culture wastewater, which adopts a wastewater treatment system comprising an anaerobic tank, a medium sedimentation tank, a nitrification tank, an anoxic tank, a coagulation tank, a sedimentation tank and a magnetic separation device;
s1, wastewater firstly enters an anaerobic tank, organic matters in the wastewater are degraded into low-molecular fatty acids by the anaerobic tank, and the low-molecular fatty acids are absorbed and stored by denitrifying phosphorus removal bacteria;
s2, enabling the effluent after the treatment of the anaerobic tank to enter a middle sedimentation tank for mud-water separation, enabling supernatant fluid to enter a nitrifying tank, and performing a nitrifying reaction by using nitrifying bacteria fixed by biological carrier fillers in the nitrifying tank under the aeration oxygen supply condition to convert ammonia nitrogen in the water into nitrate nitrogen; the settled sludge enters an anoxic tank;
s3, enabling the effluent after the treatment of the nitrification tank to enter an anoxic tank, and enabling denitrifying phosphorus removal bacteria in the anoxic tank to synchronously remove nitrate nitrogen and phosphorus by using the nitrate nitrogen as an electron acceptor;
s4, enabling the effluent treated by the anoxic tank to enter a coagulation tank, adding a flocculating agent and magnetic powder for flocculation, and further removing phosphorus;
s5, enabling effluent treated by the coagulation tank to enter a sedimentation tank for solid-liquid separation, and discharging supernatant after reaching standards; and (3) partially refluxing the magnetic-containing sludge to an anaerobic tank, partially entering a magnetic separation device, recycling the separated magnetic powder to a coagulation tank, and carrying out outward treatment after dewatering the separated non-magnetic sludge.
According to the magnetic coagulation coupling biological strengthening treatment method for eel culture wastewater, a biological denitrification and dephosphorization process is coupled with a magnetic coagulation technology, under the action of magnetic powder and a flocculating agent, magnetic substances and nonmagnetic suspended matters in wastewater are combined to form micro-magnetic flocculation, the effect of chemical dephosphorization is strengthened, meanwhile, the occupied area of a precipitation unit is reduced, magnetic sludge separated by a precipitation tank after flocculation flows back to a biological unit anaerobic tank, the effects of improving the sedimentation performance of the biological unit sludge, stabilizing oxidation-reduction potential and strengthening anaerobic environment are exerted, and the effect of biological denitrification and dephosphorization is further promoted. Wherein, for biological nitrogen and phosphorus removal process, aiming at the water quality characteristics of low organic matters and higher nitrogen and phosphorus of eel raising wastewater, a mode different from the traditional anaerobic-neutral sedimentation (precipitation) -nitrification (aerobic) -anoxic mode is adopted: the anaerobic tank degrades organic matters into low-molecular fatty acids, and the low-molecular fatty acids are absorbed and stored by denitrifying phosphorus removal bacteria to provide energy for denitrifying phosphorus removal of the anoxic tank; the middle sedimentation tank directly transfers the settled anaerobic sludge to the anoxic tank, so that denitrifying phosphorus removal bacteria can be always in an anaerobic/anoxic environment, the dominant environment of the bacteria is ensured, the nitrifying bacteria are fixed by adding biological carrier filler to the nitrifying tank, the nitrifying bacteria can be in a proper environment, a double sludge age mode of biological denitrification is realized, the advantages of functional bacteria are better exerted, and the denitrification and phosphorus removal effects of subsequent biological units are improved; the anoxic tank uses the nitrate nitrogen converted by the nitrifying tank as an electron acceptor, and the nitrate nitrogen is removed while biological phosphorus removal is realized through the effect of denitrifying phosphorus removal bacteria. The mode avoids the competition of denitrification and anaerobic dephosphorization to organic matters in the traditional anaerobic-anoxic-aerobic process, and is suitable for denitrification and dephosphorization under the condition of low water inlet organic matters of eel raising wastewater.
Alternatively, in step S1, the residence time of the anaerobic tank is 1.5h.
Optionally, in step S2, the bio-carrier filler is a fixed elastic filler, and the filling ratio is 0.5-0.8.
Optionally, in step S2, the residence time of the nitrifying pond is 4-8h, and the gas-water ratio is 3-8:1.
Optionally, in step S3, the residence time of the anoxic tank is 1.5-3h.
Optionally, in step S4, the flocculant is a composition of an organic polymer coagulant aid and an aluminum salt, and the coagulation time is 0.5-1h.
Optionally, in step S5, the magnetic sludge reflux ratio is 50-100%.
Drawings
FIG. 1 is a process flow diagram of the magnetic coagulation coupling biological strengthening treatment method of eel culture wastewater.
Detailed Description
In order that the above-described aspects may be better understood, exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present invention are shown in the drawings, it should be understood that the present invention may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.
As shown in FIG. 1, the embodiment of the invention provides a magnetic coagulation coupling biological strengthening treatment method for eel culture wastewater, and a wastewater treatment system adopted by the method comprises an anaerobic tank, a medium sedimentation tank, a nitrification tank, an anoxic tank, a coagulation tank, a sedimentation tank and a magnetic separation device;
s1, wastewater firstly enters an anaerobic tank, organic matters in the wastewater are degraded into low-molecular fatty acids by the anaerobic tank, and the low-molecular fatty acids are absorbed and stored by denitrifying phosphorus removal bacteria;
s2, enabling the effluent after the treatment of the anaerobic tank to enter a middle sedimentation tank for mud-water separation, enabling supernatant fluid to enter a nitrifying tank, and performing a nitrifying reaction by using nitrifying bacteria fixed by biological carrier fillers in the nitrifying tank under the aeration oxygen supply condition to convert ammonia nitrogen in the water into nitrate nitrogen; the settled sludge enters an anoxic tank;
s3, enabling the effluent after the treatment of the nitrification tank to enter an anoxic tank, and enabling denitrifying phosphorus removal bacteria in the anoxic tank to synchronously remove nitrate nitrogen and phosphorus by using the nitrate nitrogen as an electron acceptor;
s4, enabling the effluent treated by the anoxic tank to enter a coagulation tank, adding a flocculating agent and magnetic powder for flocculation, and further removing phosphorus;
s5, enabling effluent treated by the coagulation tank to enter a sedimentation tank for solid-liquid separation, and discharging supernatant after reaching standards; and (3) partially refluxing the magnetic-containing sludge to an anaerobic tank, partially entering a magnetic separation device, recycling the separated magnetic powder to a coagulation tank, and carrying out outward treatment after dewatering the separated non-magnetic sludge.
In step S1, the residence time of the anaerobic tank was 1.5h.
In the step S2, the biological carrier filler is fixed elastic filler, and the filling ratio is 0.5-0.8.
In the step S2, the residence time of the nitrifying pond is 4-8h, and the gas-water ratio is 3-8:1.
In the step S3, the stay time of the anoxic tank is 1.5-3h.
In the step S4, the flocculating agent is a composition of an organic polymer coagulant aid and aluminum salt, and the coagulation time is 0.5-1h.
In the step S5, the magnetic sludge reflux ratio is 50-100%.
Example 1
The tail water treatment system of the eel raising factory has tail water discharge amount of 2000 tons/day, and the average water quality of the tail water is shown in table 1.
TABLE 1 average tail water quality for cultivation
The embodiment provides a magnetic coagulation coupling biological strengthening treatment method for eel culture wastewater, which adopts a wastewater treatment system comprising an anaerobic tank, a medium sedimentation tank, a nitrification tank, an anoxic tank, a coagulation tank, a sedimentation tank and a magnetic separation device, and specifically comprises the following steps:
s1, enabling the culture tail water to enter an anaerobic tank, degrading organic matters in the culture tail water into low-molecular fatty acid by the anaerobic tank, absorbing and storing by denitrifying phosphorus removal bacteria, and keeping the residence time of the anaerobic tank for 1.5 hours;
s2, enabling effluent water treated by the anaerobic tank to enter a middle sedimentation tank for mud-water separation, enabling supernatant fluid to enter a nitrifying tank, and performing a nitrifying reaction by using nitrifying bacteria fixed by biological carrier fillers in the nitrifying tank under the aeration oxygen supply condition, so that ammonia nitrogen in the water is converted into nitrate nitrogen, wherein the filling ratio is 0.6, and the gas-water ratio is 5:1; the settled sludge enters an anoxic tank; the residence time of the nitrifying pond is 5 hours;
s3, enabling the effluent after the treatment of the nitrification tank to enter an anoxic tank, enabling denitrifying phosphorus removal bacteria in the anoxic tank to synchronously remove nitrate nitrogen and phosphorus by using the nitrate nitrogen as an electron acceptor, wherein the stay time of the anoxic tank is 2h;
s4, the effluent treated by the anoxic tank enters a coagulation tank, flocculant and magnetic powder are added for flocculation, phosphorus is further removed, the addition amount of the flocculant is adjusted according to the online total phosphorus value of the effluent, and the residence time of the coagulation tank is 0.5h;
s5, enabling effluent treated by the coagulation tank to enter a sedimentation tank for solid-liquid separation, and discharging supernatant after reaching standards; and (3) partially refluxing the magnetic-containing sludge to an anaerobic tank, wherein the reflux ratio is 50%, partially entering a magnetic separation device, recycling the separated magnetic powder to a coagulation tank, and carrying out external transportation treatment after the separated non-magnetic sludge is dehydrated.
Detecting the effluent of the nitrifying pond, wherein the ammonia nitrogen content of the effluent is less than or equal to 1mg/L; detecting the effluent of the anoxic tank, wherein the total nitrogen content is less than or equal to 3mg/L, and the total phosphorus content is less than or equal to 0.8mg/L; the effluent from the sedimentation tank was examined, and the average effluent quality and removal rate were recorded in table 2.
TABLE 2 average water quality and removal rate of sedimentation tank effluent
Comparative example 1
The tail water treatment system of the eel raising factory has tail water discharge amount of 2000 tons/day, and the average water quality of the tail water is shown in Table 3.
TABLE 3 average tail water quality for cultivation
The main difference between the comparative example and the embodiment is that the traditional anaerobic-anoxic-aerobic mode is adopted, namely, the wastewater treatment system comprises an anaerobic tank, an anoxic tank, an aerobic tank and a sedimentation tank, and specifically comprises the following steps:
a1, the culture tail water firstly enters an anaerobic tank, and the retention time of the anaerobic tank is 2h;
a2, the effluent after being treated by the anaerobic tank enters an anoxic tank, and the retention time of the anoxic tank is 4h;
a3, the effluent after the treatment of the anoxic tank enters an aerobic tank, a flocculating agent is added at the tail end of the aerobic tank, the retention time of the aerobic tank is 8 hours, and the mixed solution of the aerobic tank partially flows back to the anoxic tank with a reflux ratio of 150%;
a4, the effluent of the aerobic tank enters a sedimentation tank (secondary sedimentation tank) for sedimentation and is discharged, part of sludge in the sedimentation tank flows back to the anaerobic section, the reflux ratio is 50%, and the part of sludge is treated as surplus sludge and then is transported and disposed.
The effluent from the sedimentation tank was examined, and the average effluent quality and removal rate were recorded in table 4.
Table 4 average water quality and removal rate of sedimentation tank effluent
Compared with the comparative example 1, the process flow of the invention has higher treatment efficiency for removing pollutants such as ammonia nitrogen, total phosphorus and the like in eel culture tail water, realizes standard discharge of high-concentration nitrogen-containing and phosphorus-containing eel culture wastewater under the condition of low water inflow organic matters, and has wide application prospect.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the invention.
Claims (7)
1. The magnetic coagulation coupling biological strengthening treatment method for eel culture wastewater is characterized in that a wastewater treatment system comprises an anaerobic tank, a medium sedimentation tank, a nitrification tank, an anoxic tank, a coagulation tank, a sedimentation tank and a magnetic separation device;
s1, wastewater firstly enters an anaerobic tank, organic matters in the wastewater are degraded into low-molecular fatty acids by the anaerobic tank, and the low-molecular fatty acids are absorbed and stored by denitrifying phosphorus removal bacteria;
s2, enabling the effluent after the treatment of the anaerobic tank to enter a middle sedimentation tank for mud-water separation, enabling supernatant fluid to enter a nitrifying tank, and performing a nitrifying reaction by using nitrifying bacteria fixed by biological carrier fillers in the nitrifying tank under the aeration oxygen supply condition to convert ammonia nitrogen in the water into nitrate nitrogen; the settled sludge enters an anoxic tank;
s3, enabling the effluent after the treatment of the nitrification tank to enter an anoxic tank, and enabling denitrifying phosphorus removal bacteria in the anoxic tank to synchronously remove nitrate nitrogen and phosphorus by using the nitrate nitrogen as an electron acceptor;
s4, enabling the effluent treated by the anoxic tank to enter a coagulation tank, adding a flocculating agent and magnetic powder for flocculation, and further removing phosphorus;
s5, enabling effluent treated by the coagulation tank to enter a sedimentation tank for solid-liquid separation, and discharging supernatant after reaching standards; and (3) partially refluxing the magnetic-containing sludge to an anaerobic tank, partially entering a magnetic separation device, recycling the separated magnetic powder to a coagulation tank, and carrying out outward treatment after dewatering the separated non-magnetic sludge.
2. The magnetic coagulation coupling biological strengthening treatment method of eel culture wastewater according to claim 1, wherein the residence time of the anaerobic tank in the step S1 is 1.5h.
3. The method for magnetically coagulation coupling bioaugmentation treatment of eel culture wastewater according to claim 1, wherein in the step S2, the bio-carrier filler is a fixed elastic filler, and the filling ratio is 0.5-0.8.
4. The method for magnetically-coagulating coupled biological enhancement of eel culture wastewater according to claim 1, wherein in step S2, the residence time of the nitrification tank is 4-8h, and the gas-water ratio is 3-8:1.
5. The method for magnetically coagulation-coupled bioaugmentation of eel culture wastewater according to claim 1, wherein in the step S3, the retention time of the anoxic tank is 1.5-3 hours.
6. The method for magnetically coagulating and coupling biological strengthening treatment of eel culture wastewater according to claim 1, wherein in the step S4, the flocculating agent is a composition of an organic polymer coagulant aid and aluminum salt, and the coagulation time is 0.5-1h.
7. The method for magnetically coagulating and coupling bioaugmentation of eel culture wastewater according to claim 1, wherein in the step S5, the magnetic sludge reflux ratio is 50-100%.
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