CN114368838A - Treatment method of nitrogen and phosphorus wastewater - Google Patents
Treatment method of nitrogen and phosphorus wastewater Download PDFInfo
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- CN114368838A CN114368838A CN202210029208.0A CN202210029208A CN114368838A CN 114368838 A CN114368838 A CN 114368838A CN 202210029208 A CN202210029208 A CN 202210029208A CN 114368838 A CN114368838 A CN 114368838A
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- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 title claims abstract description 86
- 239000002351 wastewater Substances 0.000 title claims abstract description 50
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 title claims abstract description 43
- 239000011574 phosphorus Substances 0.000 title claims abstract description 43
- 229910052757 nitrogen Inorganic materials 0.000 title claims abstract description 42
- 229910052698 phosphorus Inorganic materials 0.000 title claims abstract description 42
- 238000000034 method Methods 0.000 title claims abstract description 35
- 241000195493 Cryptophyta Species 0.000 claims abstract description 66
- 238000004519 manufacturing process Methods 0.000 claims abstract description 33
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 18
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 18
- 238000007599 discharging Methods 0.000 claims abstract description 11
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 10
- 239000003546 flue gas Substances 0.000 claims abstract description 10
- 239000007788 liquid Substances 0.000 claims abstract description 9
- 238000010438 heat treatment Methods 0.000 claims abstract description 6
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- 239000001569 carbon dioxide Substances 0.000 claims description 14
- 229910002092 carbon dioxide Inorganic materials 0.000 claims description 14
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 14
- 238000000108 ultra-filtration Methods 0.000 claims description 12
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- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 claims description 4
- 230000005791 algae growth Effects 0.000 claims description 4
- 229910000037 hydrogen sulfide Inorganic materials 0.000 claims description 4
- 239000000463 material Substances 0.000 claims description 4
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- 239000002808 molecular sieve Substances 0.000 claims description 3
- URGAHOPLAPQHLN-UHFFFAOYSA-N sodium aluminosilicate Chemical compound [Na+].[Al+3].[O-][Si]([O-])=O.[O-][Si]([O-])=O URGAHOPLAPQHLN-UHFFFAOYSA-N 0.000 claims description 3
- 238000009283 thermal hydrolysis Methods 0.000 claims description 3
- YUWBVKYVJWNVLE-UHFFFAOYSA-N [N].[P] Chemical compound [N].[P] YUWBVKYVJWNVLE-UHFFFAOYSA-N 0.000 claims 8
- 230000009467 reduction Effects 0.000 abstract description 4
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- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 description 3
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- WQZGKKKJIJFFOK-GASJEMHNSA-N Glucose Natural products OC[C@H]1OC(O)[C@H](O)[C@@H](O)[C@@H]1O WQZGKKKJIJFFOK-GASJEMHNSA-N 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 229910021578 Iron(III) chloride Inorganic materials 0.000 description 1
- VMHLLURERBWHNL-UHFFFAOYSA-M Sodium acetate Chemical compound [Na+].CC([O-])=O VMHLLURERBWHNL-UHFFFAOYSA-M 0.000 description 1
- VGPSUIRIPDYGFV-UHFFFAOYSA-N [N].O[N+]([O-])=O Chemical compound [N].O[N+]([O-])=O VGPSUIRIPDYGFV-UHFFFAOYSA-N 0.000 description 1
- DIZPMCHEQGEION-UHFFFAOYSA-H aluminium sulfate (anhydrous) Chemical compound [Al+3].[Al+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O DIZPMCHEQGEION-UHFFFAOYSA-H 0.000 description 1
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- WQZGKKKJIJFFOK-VFUOTHLCSA-N beta-D-glucose Chemical compound OC[C@H]1O[C@@H](O)[C@H](O)[C@@H](O)[C@@H]1O WQZGKKKJIJFFOK-VFUOTHLCSA-N 0.000 description 1
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- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 230000003301 hydrolyzing effect Effects 0.000 description 1
- RBTARNINKXHZNM-UHFFFAOYSA-K iron trichloride Chemical compound Cl[Fe](Cl)Cl RBTARNINKXHZNM-UHFFFAOYSA-K 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000002071 nanotube Substances 0.000 description 1
- 238000006386 neutralization reaction Methods 0.000 description 1
- JCXJVPUVTGWSNB-UHFFFAOYSA-N nitrogen dioxide Inorganic materials O=[N]=O JCXJVPUVTGWSNB-UHFFFAOYSA-N 0.000 description 1
- 235000015097 nutrients Nutrition 0.000 description 1
- 239000005416 organic matter Substances 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 230000020477 pH reduction Effects 0.000 description 1
- 229910001392 phosphorus oxide Inorganic materials 0.000 description 1
- 230000029553 photosynthesis Effects 0.000 description 1
- 238000010672 photosynthesis Methods 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
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- 150000003568 thioethers Chemical class 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- 239000002912 waste gas Substances 0.000 description 1
- 238000004065 wastewater treatment Methods 0.000 description 1
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/32—Biological treatment of water, waste water, or sewage characterised by the animals or plants used, e.g. algae
- C02F3/322—Biological treatment of water, waste water, or sewage characterised by the animals or plants used, e.g. algae use of algae
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- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
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- C12N1/00—Microorganisms, e.g. protozoa; Compositions thereof; Processes of propagating, maintaining or preserving microorganisms or compositions thereof; Processes of preparing or isolating a composition containing a microorganism; Culture media therefor
- C12N1/12—Unicellular algae; Culture media therefor
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- C02F2101/10—Inorganic compounds
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- C02F2101/00—Nature of the contaminant
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Abstract
The invention discloses a method for treating nitrogen and phosphorus wastewater, which comprises the following steps: (1) the nitrogen and phosphorus wastewater enters an algae production device, nitrogen and phosphorus in the wastewater are enriched, and inorganic carbon is converted into organic carbon; (2) discharging the algae liquid harvested in the algae production device in the step (1) into a concentration device for concentration; (3) discharging the algae obtained after the concentration treatment in the step (2) into an algae pretreatment device for pretreatment, and allowing the pretreated algae to enter an anaerobic membrane bioreactor for anaerobic biological treatment; (4) pretreating biogas generated by anaerobic fermentation in the step (3), allowing the biogas to enter a biogas storage cabinet for pressure regulation and temporary storage, and allowing the biogas to enter a biogas cogeneration device for generating electric energy and steam; (5) and (3) returning effluent of the anaerobic membrane bioreactor to the algae production device, and heating nitrogen and phosphorus wastewater together with flue gas discharged by the biogas and heat generation device. The treatment method provided by the invention can realize pollution reduction, carbon reduction and energy recycling.
Description
Technical Field
The invention relates to the technical field of sewage treatment, in particular to a treatment method of nitrogen and phosphorus wastewater.
Background
Nitrogen and phosphorus elements are main factors causing water eutrophication and water quality deterioration, and the removal of nitrogen and phosphorus in wastewater is particularly considered by sewage disposal units and ecological environment management departments. At present, the nitrogen and phosphorus wastewater is mainly treated by a method of combining biology and chemistry. Nitrogen is removed through the state conversion of ammonia nitrogen, nitric acid nitrogen and nitrogen mainly through nitrification-denitrification, an aeration fan provides oxygen for nitrification, and carbon sources (such as glucose, sodium acetate and the like) with the mass concentration of 3-4 times of that of the nitrogen are added for denitrification; phosphorus is removed by adding chemical agents (such as ferric chloride, aluminum sulfate or polyaluminium chloride and the like) with 2-3 times of phosphorus molar concentration, so that phosphorus in the wastewater forms chemical sludge precipitates, and the generated chemical sludge is secondary pollution.
The removal of nitrogen and phosphorus requires the consumption of a large amount of electric energy, organic carbon sources and chemicals, and the reduction of the consumption of the electric energy and the chemicals and the reduction of secondary pollution are very important in wastewater treatment.
Disclosure of Invention
The invention aims to provide a method for treating nitrogen and phosphorus wastewater, which can reduce the discharge of pollutants and improve the utilization rate of energy.
Based on the problems, the technical scheme provided by the invention is as follows:
a method for treating nitrogen and phosphorus wastewater comprises the following steps:
(1) the nitrogen and phosphorus wastewater enters an algae production device, algae is produced by illumination and absorption of carbon dioxide, nitrogen and phosphorus in the wastewater are enriched, and inorganic carbon is converted into organic carbon;
(2) discharging the algae liquid obtained in the algae production device in the step (1) into a concentration device for concentration, and directly discharging the supernatant without nitrogen and phosphorus into a municipal pipe network or into an ultrafiltration device to remove suspended matters and then entering a recycling system;
(3) discharging the algae obtained after the concentration treatment in the step (2) into an algae pretreatment device for pretreatment, and allowing the pretreated algae to enter an anaerobic membrane bioreactor for anaerobic biological treatment;
(4) pretreating biogas generated by anaerobic fermentation in the step (3) to remove particle impurities and sulfides, allowing the biogas to enter a biogas storage cabinet for pressure regulation and temporary storage, allowing the biogas to enter a biogas cogeneration device to generate electric energy and steam, allowing the carbon dioxide-containing flue gas to enter an algae production device to provide inorganic carbon for algae growth, and heating nitrogen and phosphorus wastewater;
(5) and (3) returning effluent of the anaerobic membrane bioreactor to the algae production device, heating nitrogen and phosphorus wastewater together with flue gas discharged by the biogas and heat generation device, and utilizing algae residues in the anaerobic membrane bioreactor in a liquid organic fertilizer or solid organic fertilizer mode.
In some embodiments, the algae production apparatus in step (1) is a vertical columnar modular reactor made of light-transmitting material, and an artificial simulated solar illumination system is provided.
In some embodiments, the height of the single-column reactor in the vertical columnar modular reactor is 20-30 m, the diameter is 500-1000 mm, the waste water in the column is circulated by a circulating pump, the flow rate is 0.05-0.1 m/s, and the retention time of the waste water in the reactor is 24-48 h.
In some embodiments, the concentration device in step (2) adopts air flotation concentration, centrifugal concentration or gravity concentration.
In some embodiments, the ultrafiltration device in the step (2) adopts immersion type or tubular ultrafiltration, and the membrane flux is 10-20L/(m)2.h)。
In some embodiments, the algae pretreatment device in step (3) adopts ultrasonic wave, thermal hydrolysis or acid-base leaching.
In some embodiments, in the step (3), the anaerobic membrane bioreactor is operated at 35-39 ℃ and has a retention time of 50-100 days.
In some embodiments, in the step (4), the biogas is washed by spraying water to remove particulate impurities and hydrogen sulfide in the biogas, and a refrigerator or a molecular sieve is used to remove water in the biogas.
In some embodiments, in the step (4), the biogas storage cabinet adopts a wet bell jar type gas cabinet or a dry double-membrane gas cabinet, and the outlet pressure is adjusted to 3000-5000 Pa.
Compared with the prior art, the invention has the advantages that:
1. the algae absorb nitrogen, phosphorus and carbon dioxide to generate carbohydrate and compounds, the aeration energy consumption and the addition of carbon sources and chemicals are reduced, the carbon dioxide is fixed to generate renewable energy, the discharge of the carbon dioxide is reduced while pollutants are removed in the whole process, and the method is a correct way for reducing pollution and carbon and realizing carbon neutralization;
2. chemical agents are not added in the process of algae concentration and supernatant treatment, the generated tail water can be neutralized and recycled, the biogas slurry or the biogas residues can be used as organic fertilizers, and secondary pollution is avoided;
3. the algae production device adopts a modular columnar reactor made of light-transmitting materials, has large specific surface area, high light energy utilization rate and high algae production rate, adopts a closed type circulating pump, and has controllable flow rate, controllable illumination intensity and stable growth rate;
4. the algae production device adopts a vertical structure, and is about 1/10 of the land occupied by a horizontal tank body;
5. the algae production device is provided with an artificial simulated solar illumination system, the illumination time is 2-3 times of natural illumination, and the algae yield is 2-3 times of the natural illumination;
6. the cogeneration tail gas enters an algae production device, waste water is treated by waste gas, and the high-temperature flue gas and the effluent of the anaerobic membrane bioreactor heat the waste water in the algae production device together, so that the temperature of the waste water is increased by about 5 ℃, and the growth rate of algae is increased by about 1 time;
7. the anaerobic membrane bioreactor has good water quality, can be directly recycled or discharged into municipal pipe networks, does not carry sludge in the discharged water, and has stable operation and high automation degree.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the description of the embodiments are briefly introduced below, the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a process flow diagram of an embodiment of the treatment method of nitrogen and phosphorus wastewater of the present invention.
Detailed Description
The above-described scheme is further illustrated below with reference to specific examples. It should be understood that these examples are for illustrative purposes and are not intended to limit the scope of the present invention. The conditions used in the examples may be further adjusted according to the conditions of the particular manufacturer, and the conditions not specified are generally the conditions in routine experiments.
Referring to fig. 1, a schematic structural diagram of an embodiment of the present invention provides a method for treating nitrogen and phosphorus wastewater, where the nitrogen and phosphorus wastewater treated by the method is mainly wastewater with a total nitrogen concentration of below 50mg/L, a total phosphorus concentration of below 10mg/L, and a COD of less than 500mg/L, and the method includes the following steps:
(1) the nitrogen and phosphorus wastewater enters an algae production device, algae is produced by illumination and absorption of carbon dioxide, nitrogen and phosphorus in the wastewater are enriched, and inorganic carbon (carbon dioxide) is converted into organic carbon such as carbohydrate;
(2) discharging the algae liquid obtained in the algae production device in the step (1) into a concentration device for concentration, and directly discharging the supernatant without nitrogen and phosphorus into a municipal pipe network or into an ultrafiltration device for removing suspended matters and then entering recycling systems such as garden landscapes, municipal roads and the like;
(3) discharging the algae obtained after the concentration treatment in the step (2) into an algae pretreatment device for pretreatment, allowing the heated algae to enter an anaerobic membrane bioreactor for anaerobic biological treatment, performing anaerobic fermentation at a medium temperature, and converting organic carbon such as carbohydrates into biogas through stages of hydrolytic acidification, hydrogen production, acetic acid production, methane production and the like;
(4) after pretreatment such as desulfurization, particle impurity removal, dehydration and the like of the biogas generated by anaerobic fermentation, the biogas enters a biogas storage cabinet for pressure regulation and temporary storage, then enters a biogas cogeneration device for generating electric energy and steam, the flue gas containing carbon dioxide enters an algae production device for providing inorganic carbon for algae growth, and simultaneously, nitrogen and phosphorus wastewater is heated;
(5) and (3) returning effluent of the anaerobic membrane bioreactor to the algae production device, heating nitrogen and phosphorus wastewater together with flue gas discharged by the biogas and heat generation device, and utilizing algae residues in the anaerobic membrane bioreactor in a liquid organic fertilizer or solid organic fertilizer mode.
The algae production device is a vertical columnar modular reactor made of light-transmitting materials such as glass or organic glass, an artificial simulation solar illumination system is arranged, the illumination intensity is 1000 Lux-10000 Lux, the control can be carried out as required, and the illumination is carried out for 24 hours and is 2-3 times of the natural illumination time. The height of the single-column reactor in the vertical columnar modular reactor is 20-30 m, the diameter is 500-1000 mm, the waste water in the column is circulated by a circulating pump, the flow rate is 0.05-0.1 m/s, and the waste water stays in the reactor for 24-48 h. Algae productivity of 200-400 gVSS/(m)2D). The fixed amount of carbon dioxide is 1.5 to 2.0 times of the yield of the algae.
The concentration device adopts air flotation concentration, centrifugal concentration or gravity concentration to concentrate the algae liquid with the solid content of about 1 percent to the solid content of 3 to 4 percent. Air flotation concentration, centrifugal concentration or gravity concentration are not added with flocculating agents or coagulant aids. Air flotation concentration is adopted, and the surface load is 4-6 m3/(m2H), concentration by gravity, solids loading 30～60kgDS/(m2D). The concentrated supernatant with nitrogen and phosphorus content less than the standard of nano-tubes can be directly discharged into municipal pipelines, or can be treated by an ultrafiltration device as required and then discharged into recycling systems such as garden landscapes, municipal roads and the like.
The ultrafiltration device adopts immersion type or tubular ultrafiltration, and the membrane flux is 10-20L/(m)2H). The COD of the effluent of the ultrafiltration device is less than 100mg/L, the total nitrogen is less than 10mg/L, and the total phosphorus is less than 0.5 mg/L.
The algae pretreatment device in the step (3) adopts an ultrasonic, thermal hydrolysis or acid-base leaching mode to pretreat the algae obtained by concentration, can shorten the reaction time of subsequent anaerobic treatment and improve the biogas yield, and can directly enter the anaerobic treatment without pretreatment according to the requirement.
The operation temperature of the anaerobic membrane bioreactor in the step (3) is 35-39 ℃, and the biogas yield is about 0.15-0.3 m3Biogas/m3And (3) the reactor is kept for 50-100 days. The anaerobic organic matter digestion rate is 50-70%, and 30-50% of residues in the anaerobic membrane bioreactor are used as organic fertilizer for external application in a form of solid biogas residues or liquid biogas slurry regularly. Effluent of the anaerobic membrane bioreactor flows back to the algae production device, heats the wastewater together with the flue gas, and provides algae growth by using the residual nitrogen and phosphorus nutrient elements.
And (4) removing particle impurities and hydrogen sulfide in the biogas by adopting spray washing in the biogas in the step (4), ensuring that the content of the hydrogen sulfide in the outlet gas is less than 20ppm, and removing water in the biogas by adopting a refrigerator or a molecular sieve.
And (4) adopting a wet bell-type gas cabinet or a dry double-membrane gas cabinet as the methane storage cabinet in the step (4), and adjusting the gas outlet pressure to be 3000-5000 Pa.
The biogas cogeneration device adopts an internal combustion engine to generate electricity, and the waste heat of hot water of a generator cylinder body and smoke waste heat of a chimney is recovered by a waste heat boiler. The power generation efficiency of the internal combustion engine is 35-40%, and the heat efficiency of the waste heat boiler is 40-45%. The tail gas of the cogeneration device containing about 20 percent of carbon dioxide is introduced into the algae production device at the temperature of about 120 ℃ to provide carbon dioxide required by photosynthesis for algae production, the flue gas and the effluent of the anaerobic membrane bioreactor heat the wastewater in the algae production device together, the water temperature is raised by about 5 ℃, and the growth rate is improved by about 1 time.
The following is a specific example of the above treatment method:
an algae production device comprises 200 groups of columnar reactors with diameter of 1000mm and height of 25m and total volume of 3925m3Total area 15700m2。
Treated water quantity 2617m3And d, the retention time of the wastewater of the device is 36 hours, the COD of the inlet water of the algae production device is less than 500mg/L, the total nitrogen is less than 50mg/L, the total phosphorus is less than 10mg/L, the COD of the outlet water of the ultrafiltration device is less than 100mg/L, the total nitrogen is less than 10mg/L, and the total phosphorus is less than 0.5 mg/L.
Algae yield of 100 gVSS/(m)2D), yield of 4710kgVSS/d, fixation of 8478kg/d of carbon dioxide, yield of 1% solids in wet algae 471m3(d) algae 157m with a solid content of 3% after concentration3。
The methane yield is 0.5m3KgVSS, methane yield 0.3m3KgVSS, anaerobic membrane bioreactor 0.3m3Biogas/m3Reactor, anaerobic reactor volume 7850m3Algae retention time 50 d. The amount of discharged residue was 1860 kgDS/d.
Biogas yield 2355m3And/d, generating capacity 4872kW.h each day.
Therefore, the treatment method can realize pollution-reducing and carbon-reducing treatment of the nitrogen and phosphorus wastewater, and can simultaneously produce renewable energy sources and improve the energy utilization rate.
The above embodiments are merely illustrative of the technical ideas and features of the present invention, and the purpose of the embodiments is to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.
Claims (9)
1. The method for treating the nitrogen and phosphorus wastewater is characterized by comprising the following steps of:
(1) the nitrogen and phosphorus wastewater enters an algae production device, algae is produced by illumination and absorption of carbon dioxide, nitrogen and phosphorus in the wastewater are enriched, and inorganic carbon is converted into organic carbon;
(2) discharging the algae liquid obtained in the algae production device in the step (1) into a concentration device for concentration, and directly discharging the supernatant without nitrogen and phosphorus into a municipal pipe network or into an ultrafiltration device to remove suspended matters and then entering a recycling system;
(3) discharging the algae obtained after the concentration treatment in the step (2) into an algae pretreatment device for pretreatment, and allowing the pretreated algae to enter an anaerobic membrane bioreactor for anaerobic biological treatment;
(4) pretreating biogas generated by anaerobic fermentation in the step (3), then, entering a biogas storage cabinet for pressure regulation and temporary storage, then entering a biogas cogeneration device for generating electric energy and steam, entering carbon dioxide-containing flue gas into an algae production device for providing inorganic carbon for algae growth, and simultaneously heating nitrogen and phosphorus wastewater;
(5) and (3) returning effluent of the anaerobic membrane bioreactor to the algae production device, heating nitrogen and phosphorus wastewater together with flue gas discharged by the biogas and heat generation device, and utilizing algae residues in the anaerobic membrane bioreactor in a liquid organic fertilizer or solid organic fertilizer mode.
2. The method for treating nitrogen-phosphorus wastewater according to claim 1, wherein the method comprises the following steps: the algae production device in the step (1) is a vertical columnar modular reactor made of light-transmitting materials, and is provided with an artificial simulated solar illumination system.
3. The method for treating nitrogen-phosphorus wastewater according to claim 2, wherein the method comprises the following steps: the height of the single-column reactor in the vertical columnar modular reactor is 20-30 m, the diameter is 500-1000 mm, the waste water in the column is circulated by a circulating pump, the flow rate is 0.05-0.1 m/s, and the retention time of the waste water in the reactor is 24-48 h.
4. The method for treating nitrogen-phosphorus wastewater according to claim 1, wherein the method comprises the following steps: and (3) the concentration device in the step (2) adopts air flotation concentration, centrifugal concentration or gravity concentration.
5. The method for treating nitrogen-phosphorus wastewater according to claim 1, wherein the method comprises the following steps: in the step (2), the ultrafiltration device adopts immersion type or tubular ultrafiltration, and the membrane flux is 10-20L/(m)2.h)。
6. The method for treating nitrogen-phosphorus wastewater according to claim 1, wherein the method comprises the following steps: the algae pretreatment device in the step (3) adopts an ultrasonic wave, thermal hydrolysis or acid-base leaching mode.
7. The method for treating nitrogen-phosphorus wastewater according to claim 1, wherein the method comprises the following steps: the operation temperature of the anaerobic membrane bioreactor in the step (3) is 35-39 ℃, and the retention time is 50-100 days.
8. The method for treating nitrogen-phosphorus wastewater according to claim 1, wherein the method comprises the following steps: and (4) in the step (4), the biogas is sprayed and washed to remove particle impurities and hydrogen sulfide in the biogas, and a refrigerator or a molecular sieve is adopted to remove water in the biogas.
9. The method for treating nitrogen-phosphorus wastewater according to claim 1, wherein the method comprises the following steps: and (4) adopting a wet bell-type gas cabinet or a dry double-film gas cabinet as the methane storage cabinet in the step (4), and adjusting the gas outlet pressure to be 3000-5000 Pa.
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