CN114195314A - Wastewater treatment method and application thereof - Google Patents
Wastewater treatment method and application thereof Download PDFInfo
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- CN114195314A CN114195314A CN202111589219.6A CN202111589219A CN114195314A CN 114195314 A CN114195314 A CN 114195314A CN 202111589219 A CN202111589219 A CN 202111589219A CN 114195314 A CN114195314 A CN 114195314A
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- 238000004065 wastewater treatment Methods 0.000 title claims abstract description 23
- 239000007788 liquid Substances 0.000 claims abstract description 77
- 239000002351 wastewater Substances 0.000 claims abstract description 59
- 239000007787 solid Substances 0.000 claims abstract description 48
- 238000000034 method Methods 0.000 claims abstract description 38
- 239000003895 organic fertilizer Substances 0.000 claims abstract description 34
- 238000003756 stirring Methods 0.000 claims abstract description 24
- 159000000003 magnesium salts Chemical class 0.000 claims abstract description 19
- 238000006243 chemical reaction Methods 0.000 claims abstract description 18
- AZDRQVAHHNSJOQ-UHFFFAOYSA-N alumane Chemical class [AlH3] AZDRQVAHHNSJOQ-UHFFFAOYSA-N 0.000 claims abstract description 16
- 238000000926 separation method Methods 0.000 claims abstract description 15
- 238000009264 composting Methods 0.000 claims abstract description 11
- 238000001914 filtration Methods 0.000 claims description 20
- 239000000203 mixture Substances 0.000 claims description 13
- 239000002893 slag Substances 0.000 claims description 12
- 230000008569 process Effects 0.000 claims description 9
- 239000011259 mixed solution Substances 0.000 claims description 8
- 238000010438 heat treatment Methods 0.000 claims description 6
- 238000006477 desulfuration reaction Methods 0.000 claims description 5
- 230000023556 desulfurization Effects 0.000 claims description 5
- 238000004062 sedimentation Methods 0.000 claims description 4
- 238000000855 fermentation Methods 0.000 abstract description 29
- 230000004151 fermentation Effects 0.000 abstract description 28
- 229910019142 PO4 Inorganic materials 0.000 abstract description 17
- 239000010452 phosphate Substances 0.000 abstract description 13
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 21
- 229910052698 phosphorus Inorganic materials 0.000 description 21
- 239000011574 phosphorus Substances 0.000 description 21
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 20
- VSCWAEJMTAWNJL-UHFFFAOYSA-K aluminium trichloride Chemical compound Cl[Al](Cl)Cl VSCWAEJMTAWNJL-UHFFFAOYSA-K 0.000 description 16
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 description 16
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 14
- 241001107116 Castanospermum australe Species 0.000 description 13
- 235000021279 black bean Nutrition 0.000 description 13
- 239000000395 magnesium oxide Substances 0.000 description 12
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 12
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 description 12
- 230000000694 effects Effects 0.000 description 11
- 239000002609 medium Substances 0.000 description 11
- 239000000243 solution Substances 0.000 description 11
- 229910052757 nitrogen Inorganic materials 0.000 description 10
- 238000002156 mixing Methods 0.000 description 9
- 239000000126 substance Substances 0.000 description 8
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 7
- 230000035784 germination Effects 0.000 description 7
- 239000002689 soil Substances 0.000 description 7
- 239000011593 sulfur Substances 0.000 description 7
- 229910052717 sulfur Inorganic materials 0.000 description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 7
- 238000013329 compounding Methods 0.000 description 6
- 238000001514 detection method Methods 0.000 description 6
- 239000010865 sewage Substances 0.000 description 6
- 239000003337 fertilizer Substances 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- 239000000843 powder Substances 0.000 description 5
- 241000894006 Bacteria Species 0.000 description 4
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 description 4
- 239000000292 calcium oxide Substances 0.000 description 4
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 4
- 239000002985 plastic film Substances 0.000 description 4
- 229920006255 plastic film Polymers 0.000 description 4
- 239000002244 precipitate Substances 0.000 description 4
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 3
- WDIHJSXYQDMJHN-UHFFFAOYSA-L barium chloride Chemical compound [Cl-].[Cl-].[Ba+2] WDIHJSXYQDMJHN-UHFFFAOYSA-L 0.000 description 3
- 229910001626 barium chloride Inorganic materials 0.000 description 3
- 238000010170 biological method Methods 0.000 description 3
- 239000003153 chemical reaction reagent Substances 0.000 description 3
- 238000012258 culturing Methods 0.000 description 3
- 235000015097 nutrients Nutrition 0.000 description 3
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 description 2
- 239000005909 Kieselgur Substances 0.000 description 2
- TWRXJAOTZQYOKJ-UHFFFAOYSA-L Magnesium chloride Chemical compound [Mg+2].[Cl-].[Cl-] TWRXJAOTZQYOKJ-UHFFFAOYSA-L 0.000 description 2
- CSNNHWWHGAXBCP-UHFFFAOYSA-L Magnesium sulfate Chemical compound [Mg+2].[O-][S+2]([O-])([O-])[O-] CSNNHWWHGAXBCP-UHFFFAOYSA-L 0.000 description 2
- 229910000329 aluminium sulfate Inorganic materials 0.000 description 2
- MXZRMHIULZDAKC-UHFFFAOYSA-L ammonium magnesium phosphate Chemical compound [NH4+].[Mg+2].[O-]P([O-])([O-])=O MXZRMHIULZDAKC-UHFFFAOYSA-L 0.000 description 2
- 239000011575 calcium Substances 0.000 description 2
- 239000001110 calcium chloride Substances 0.000 description 2
- 229910001628 calcium chloride Inorganic materials 0.000 description 2
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 description 2
- 230000000711 cancerogenic effect Effects 0.000 description 2
- 231100000357 carcinogen Toxicity 0.000 description 2
- 239000003183 carcinogenic agent Substances 0.000 description 2
- 239000000306 component Substances 0.000 description 2
- 239000002361 compost Substances 0.000 description 2
- 238000000354 decomposition reaction Methods 0.000 description 2
- 239000000706 filtrate Substances 0.000 description 2
- 238000007710 freezing Methods 0.000 description 2
- 230000008014 freezing Effects 0.000 description 2
- 239000001963 growth medium Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000012528 membrane Substances 0.000 description 2
- 238000004321 preservation Methods 0.000 description 2
- 229910052567 struvite Inorganic materials 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- BNGXYYYYKUGPPF-UHFFFAOYSA-M (3-methylphenyl)methyl-triphenylphosphanium;chloride Chemical compound [Cl-].CC1=CC=CC(C[P+](C=2C=CC=CC=2)(C=2C=CC=CC=2)C=2C=CC=CC=2)=C1 BNGXYYYYKUGPPF-UHFFFAOYSA-M 0.000 description 1
- 241000251468 Actinopterygii Species 0.000 description 1
- 240000007124 Brassica oleracea Species 0.000 description 1
- 235000003899 Brassica oleracea var acephala Nutrition 0.000 description 1
- 235000011301 Brassica oleracea var capitata Nutrition 0.000 description 1
- 235000001169 Brassica oleracea var oleracea Nutrition 0.000 description 1
- 241000219193 Brassicaceae Species 0.000 description 1
- 241000195493 Cryptophyta Species 0.000 description 1
- ZGTMUACCHSMWAC-UHFFFAOYSA-L EDTA disodium salt (anhydrous) Chemical compound [Na+].[Na+].OC(=O)CN(CC([O-])=O)CCN(CC(O)=O)CC([O-])=O ZGTMUACCHSMWAC-UHFFFAOYSA-L 0.000 description 1
- 102000004190 Enzymes Human genes 0.000 description 1
- 108090000790 Enzymes Proteins 0.000 description 1
- 238000007696 Kjeldahl method Methods 0.000 description 1
- 229910002651 NO3 Inorganic materials 0.000 description 1
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 description 1
- IOVCWXUNBOPUCH-UHFFFAOYSA-M Nitrite anion Chemical compound [O-]N=O IOVCWXUNBOPUCH-UHFFFAOYSA-M 0.000 description 1
- JVMRPSJZNHXORP-UHFFFAOYSA-N ON=O.ON=O.ON=O.N Chemical compound ON=O.ON=O.ON=O.N JVMRPSJZNHXORP-UHFFFAOYSA-N 0.000 description 1
- 241000013557 Plantaginaceae Species 0.000 description 1
- 244000046095 Psophocarpus tetragonolobus Species 0.000 description 1
- 235000010580 Psophocarpus tetragonolobus Nutrition 0.000 description 1
- 244000088415 Raphanus sativus Species 0.000 description 1
- 235000006140 Raphanus sativus var sativus Nutrition 0.000 description 1
- 241001052560 Thallis Species 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 239000011609 ammonium molybdate Substances 0.000 description 1
- APUPEJJSWDHEBO-UHFFFAOYSA-P ammonium molybdate Chemical compound [NH4+].[NH4+].[O-][Mo]([O-])(=O)=O APUPEJJSWDHEBO-UHFFFAOYSA-P 0.000 description 1
- 235000018660 ammonium molybdate Nutrition 0.000 description 1
- 229940010552 ammonium molybdate Drugs 0.000 description 1
- 230000001580 bacterial effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 235000013325 dietary fiber Nutrition 0.000 description 1
- 235000021245 dietary protein Nutrition 0.000 description 1
- 239000003651 drinking water Substances 0.000 description 1
- 235000020188 drinking water Nutrition 0.000 description 1
- 230000009939 endogenous nitrosation Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000012851 eutrophication Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 229960001545 hydrotalcite Drugs 0.000 description 1
- 229910001701 hydrotalcite Inorganic materials 0.000 description 1
- -1 hydrotalcite compound Chemical class 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000009655 industrial fermentation Methods 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 229910001629 magnesium chloride Inorganic materials 0.000 description 1
- 229910052943 magnesium sulfate Inorganic materials 0.000 description 1
- 235000019341 magnesium sulphate Nutrition 0.000 description 1
- 229910021645 metal ion Inorganic materials 0.000 description 1
- 244000005700 microbiome Species 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 235000016709 nutrition Nutrition 0.000 description 1
- 230000008520 organization Effects 0.000 description 1
- 238000005325 percolation Methods 0.000 description 1
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000011112 process operation Methods 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 102000004169 proteins and genes Human genes 0.000 description 1
- 108090000623 proteins and genes Proteins 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 230000001953 sensory effect Effects 0.000 description 1
- 238000003900 soil pollution Methods 0.000 description 1
- 238000002798 spectrophotometry method Methods 0.000 description 1
- 238000013112 stability test Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 230000009897 systematic effect Effects 0.000 description 1
- 238000004448 titration Methods 0.000 description 1
- 230000001988 toxicity Effects 0.000 description 1
- 231100000419 toxicity Toxicity 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
-
- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05F—ORGANIC FERTILISERS NOT COVERED BY SUBCLASSES C05B, C05C, e.g. FERTILISERS FROM WASTE OR REFUSE
- C05F7/00—Fertilisers from waste water, sewage sludge, sea slime, ooze or similar masses
-
- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05G—MIXTURES OF FERTILISERS COVERED INDIVIDUALLY BY DIFFERENT SUBCLASSES OF CLASS C05; MIXTURES OF ONE OR MORE FERTILISERS WITH MATERIALS NOT HAVING A SPECIFIC FERTILISING ACTIVITY, e.g. PESTICIDES, SOIL-CONDITIONERS, WETTING AGENTS; FERTILISERS CHARACTERISED BY THEIR FORM
- C05G3/00—Mixtures of one or more fertilisers with additives not having a specially fertilising activity
- C05G3/80—Soil conditioners
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/28—Treatment of water, waste water, or sewage by sorption
- C02F1/281—Treatment of water, waste water, or sewage by sorption using inorganic sorbents
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/38—Treatment of water, waste water, or sewage by centrifugal separation
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/58—Treatment of water, waste water, or sewage by removing specified dissolved compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F2001/007—Processes including a sedimentation step
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/101—Sulfur compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/105—Phosphorus compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/16—Nitrogen compounds, e.g. ammonia
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
- C02F2101/40—Organic compounds containing sulfur
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A40/00—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production
- Y02A40/10—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production in agriculture
- Y02A40/20—Fertilizers of biological origin, e.g. guano or fertilizers made from animal corpses
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Hydrology & Water Resources (AREA)
- Water Supply & Treatment (AREA)
- Soil Sciences (AREA)
- Pest Control & Pesticides (AREA)
- Fertilizers (AREA)
Abstract
The invention provides a wastewater treatment method and application thereof, wherein the treatment method comprises the following steps: (1) adding magnesium salt into the wastewater, and stirring for reaction to obtain intermediate liquid A; (2) carrying out solid-liquid separation on the intermediate liquid A to obtain clear liquid A and solid residue A; (3) adding aluminum salt into the clear liquid A, adjusting the pH of the mixed liquid to be alkaline, and then stirring for reaction to obtain intermediate liquid B; (4) and carrying out solid-liquid separation on the intermediate liquid B to obtain a clear liquid B and solid residues B. The treatment method is based on magnesium salt and aluminum salt to treat the fermentation wastewater, and the removal rates of phosphate radical, ammonium radical and sulfate radical can respectively reach more than 95%, 22% and 90%. The invention also provides an organic fertilizer and application thereof in crop cultivation, the organic fertilizer is obtained by composting solid residue A and/or solid residue B, and the resource utilization rate is high.
Description
Technical Field
The invention belongs to the technical field of sewage treatment, and particularly relates to a wastewater treatment method and application thereof.
Background
With the progress of science and technology, the biological fermentation industry develops rapidly, so that industrial fermentation wastewater containing high-concentration ammonia nitrogen, phosphate radical and sulfate radical is generated in a large amount, and the wastewater is directly discharged into a water body without treatment, so that a series of hazards can be generated, including: water eutrophication pollution can cause plankton such as algae to rapidly propagate, and finally, a great amount of fish and other organisms can die; nitrite nitrogen in drinking water exceeds the standard, and in 2017, 10 and 27 months, a carcinogen list published by international cancer research institution of world health organization is preliminarily collated and referred, and nitrate or nitrite taken under the condition of causing endogenous nitrosation is in a 2A class carcinogen list; excessive sulfate radicals can cause the water body to generate stink, and the sensory properties and the effects of the water are influenced; and fourthly, corroding the pipeline and indirectly influencing the circulation of the sulfate reducing bacteria and the propagation of biological corrosion.
At present, chemical methods and biological methods are generally adopted for nitrogen and phosphorus removal treatment of wastewater. The biological nitrogen and phosphorus removal method is mainly based on the principle that ammonia nitrogen and phosphorus are consumed and phosphorus-feeding bacteria absorb and release ammonia nitrogen and phosphorus under aerobic and anaerobic conditions, and ammonia nitrogen and phosphorus in wastewater are removed through alternate operation of the aerobic and anaerobic conditions. Therefore, many sewage generating enterprises are more inclined to treat ammonia nitrogen and phosphorus in wastewater through a chemical method, and especially when the content of ammonia nitrogen and phosphorus in wastewater is too low or too high, the effectiveness of the chemical method is greater than that of a biological method. The chemical phosphorus removal mainly refers to the removal of phosphorus in wastewater by using metal ions such as ferric salt and aluminum salt and phosphate radical to generate insoluble phosphate precipitate, but when the method is used for treating high-concentration phosphorus-containing wastewater, the dosage of phosphorus removal reagents is large, the cost is high, and no obvious effect of removing ammonia nitrogen and sulfate in the wastewater is achieved.
At present, the barium chloride method, the calcium chloride method and the freezing method are mainly adopted to remove sulfate radicals in wastewater. The barium chloride method is the most widely used chemical sulfate radical removal method in industrial application, and has the advantages of simple process operation and good removal effect, but has the defects of stronger toxicity, high storage condition requirement, high use cost and the like. The calcium chloride method has a poorer sulfate radical removing effect than the barium chloride method because the solubility product of calcium sulfate is larger. The freezing method has a large energy consumption for removing sulfate radicals, so that the industrial application is very rare at present.
The biological fermentation wastewater is a fermentation liquid membrane-passing clear liquid generated by fermentation enzyme-producing microorganisms through fermentation culture and membrane-passing separation, and is influenced by thallus residues, culture medium components and the like in the fermentation liquid membrane-passing clear liquid, the ammonia nitrogen content and the total phosphorus content of the wastewater are higher than 2500ppm, the sulfate radical content is higher, the thallus residues are more, and the wastewater cannot be directly discharged or can only be subjected to sewage treatment through a biological method to reach the discharge standard.
The prior art has unstable denitrification and dephosphorization effect, has certain limitation on the treatment of wastewater containing high-concentration ammonia nitrogen and phosphorus and sulfur, and lacks a systematic treatment method for the wastewater containing thallus residues. Therefore, a wastewater treatment method which has simple and stable process and can efficiently remove nitrogen, phosphorus and sulfur is needed.
Disclosure of Invention
The invention aims to provide a wastewater treatment method, which comprises the following steps: magnesium salt is added into the wastewater for denitrification and dephosphorization treatment, and aluminum salt is added for desulfurization treatment.
According to the preferable technical scheme, the wastewater treatment method comprises the following steps:
(1) adding magnesium salt into the wastewater, and stirring for reaction to obtain intermediate liquid A;
(2) carrying out solid-liquid separation on the intermediate liquid A to obtain clear liquid A and solid residue A;
(3) adding aluminum salt into the clear liquid A, adjusting the pH of the mixed liquid to be alkaline, and then stirring for reaction to obtain intermediate liquid B;
(4) and carrying out solid-liquid separation on the intermediate liquid B to obtain a clear liquid B and solid residues B.
According to the preferable technical scheme, the wastewater is fermentation wastewater, and the thallus cells in the fermentation broth are separated from the fermentation culture medium by separating the biological fermentation broth to obtain concentrated bacterial liquid and the fermentation wastewater.
In a preferred embodiment of the present invention, the separation treatment is any one or a combination of membrane separation, centrifugal separation, and natural sedimentation.
According to the preferable technical scheme, the waste water is heated and pretreated before being added with magnesium salt for nitrogen and phosphorus removal treatment.
According to the preferable technical scheme, the treatment temperature of the heating pretreatment is 60-110 ℃, and the treatment time is 10-50 min; preferably, the treatment temperature is 70-100 ℃, and the treatment time is 20-40 min; more preferably, the treatment temperature is 80-90 ℃ and the treatment time is 30 min.
The preferred technical scheme of the invention is according to PO4 3-/Mg2+The molar ratio is 1: 1-5, adding magnesium salt into the wastewater; preferably, according to PO4 3-/Mg2+The molar ratio is 1: adding magnesium salt in a ratio of 2-5; more preferably, according to PO4 3-/Mg2+The molar ratio is 1: adding magnesium salt at a ratio of 2-4.
In a preferred embodiment of the present invention, the magnesium salt is any one of magnesium oxide, magnesium sulfate, and magnesium chloride, and preferably magnesium oxide.
In the preferred technical scheme of the invention, the mixed solution of the magnesium salt and the wastewater is stirred and reacted for 10-60min at 20-80Hz and 30-80 ℃, preferably 30-70Hz and 40-70 ℃ for 20-50min, more preferably 40-60Hz and 50-60 ℃ for 30-40 min.
The preferred technical scheme of the invention is that in the step (3), according to SO4 2-/Al3+The molar ratio is 1: adding aluminum salt in a ratio of 0.5-2.0; preferably, as SO4 2-/Al3+The molar ratio is 1: adding aluminum salt in the proportion of 1.0-2.0; more preferably, as SO4 2-/Al3+The molar ratio is 1: aluminum salt is added in the proportion of 1.0-1.5.
In a preferred embodiment of the present invention, the aluminum salt is any one of aluminum chloride and aluminum nitrate, and is preferably aluminum chloride.
In the preferred embodiment of the present invention, in the step (3), the alkaline condition is a pH of 8-12, preferably a pH of 9-11.
According to the preferable technical scheme of the invention, in the step (3), calcium oxide is adopted for adjusting the pH of the mixed solution.
According to the preferable technical scheme of the invention, in the step (3), the mixed solution is stirred and reacted for 2-15min at the temperature of 20-60 ℃ under the condition of 5-40Hz, preferably 10-35Hz and 30-50 ℃ for 5-10min, more preferably 20-30Hz and 35-45 ℃ for 6-8 min.
According to the preferable technical scheme of the invention, the solid-liquid separation in the step (2) and the step (4) adopts any one of plate-and-frame filtration, rotary-strand filtration and natural sedimentation, and preferably adopts plate-and-frame filtration.
According to the preferable technical scheme, the filter medium used for plate-and-frame filtration is a mixture of bran and diatomite, and the mass ratio of the filter medium to the diatomite is preferably 2-5: 1, more preferably a mixture of bran and diatomaceous earth in a mass ratio of 2-4: 1 bran and diatomaceous earth mixture.
The invention also aims to provide an organic fertilizer which is obtained by composting the solid slag A and/or the solid slag B.
According to the preferable technical scheme, the organic fertilizer is obtained by composting solid residues A and B.
In a preferred embodiment of the present invention, the method for composting comprises the steps of: and mixing the solid residue A and the solid residue B, adding the clear liquid B into the solid residue mixed material, fully stirring, preserving heat, and decomposing for a period of time to obtain the organic fertilizer.
According to the preferred technical scheme, the heat preservation treatment adopts a plastic film as a heat preservation layer.
According to the preferable technical scheme, in the composting treatment, the adding amount of the clear liquid B in the solid slag mixed material is 1-12% by mass, preferably 3-12%, more preferably 3-9%, and more preferably 6-9%.
According to the preferable technical scheme of the invention, in the composting treatment, the rotting time is 5-25d, preferably 10-25d, and more preferably 15-20 d.
The invention also aims to provide application of the organic fertilizer in crop cultivation.
According to the preferable technical scheme, the crops are any one of leguminous, cruciferae and scrophulariaceae, preferably any one of black beans, hyacinth beans, summer radishes and cabbages, and more preferably the black beans.
According to the preferable technical scheme, in the crop cultivation, the application amount of the organic fertilizer is that the fertilizer/soil is 0.5-2g/m2Preferably 0.5 to 1.5g/m2More preferably 0.5 to 1.0g/m2。
Unless otherwise indicated, when the present invention relates to percentages between liquids, said percentages are volume/volume percentages; the invention relates to the percentage between liquid and solid, said percentage being volume/weight percentage; the invention relates to the percentages between solid and liquid, said percentages being weight/volume percentages; the balance being weight/weight percent.
Compared with the prior art, the invention has the following beneficial technical effects:
1. the invention provides a wastewater treatment method based on magnesium salt and aluminum salt, which is characterized in that the wastewater is determined to be sequentially subjected to heating pretreatment, nitrogen and phosphorus removal, filtration, sulfur removal and filtration treatment by optimizing the addition sequence and treatment conditions of reagents, wherein before the nitrogen and phosphorus removal, the fermentation wastewater is heated for pretreatment, so that thalli in the fermentation wastewater can be inactivated and denatured, and the environmental pollution is avoided; meanwhile, the denatured mycoprotein is easy to settle and convenient to collect, and the treatment efficiency of the subsequent filtration process is improved;
2. in the invention, magnesium salt (preferably magnesium oxide) is adopted to carry out nitrogen and phosphorus removal treatment on the wastewater, the addition amount of the magnesium oxide has influence on the nitrogen and phosphorus removal effect and the treatment cost, the magnesium oxide is slightly soluble in water and is in a suspension state, the lower stirring speed can not fully mix the magnesium oxide with the wastewater, so that the impurity removal rate is reduced, but the reaction can not be greatly promoted due to the overhigh stirring speed, so that the treatment cost is increased; based on the above, the addition amount of magnesium oxide and the reaction stirring speed are optimally designed, so that the removal rate of phosphate radicals in the wastewater can reach more than 95%, the removal rate of ammonium radicals can reach more than 22%, the excessive magnesium oxide can be used for the subsequent desulfurization reaction, and the treatment cost is reduced;
3. according to the invention, aluminum salt (preferably aluminum chloride) is adopted to carry out desulfurization treatment on the wastewater, and the addition amount of the aluminum chloride has influence on both the desulfurization effect and the treatment cost; in addition, complex Ca generated in the sulfur removal treatment6Al2(SO4)3(OH)12·26H2The O precipitate is a hydrotalcite compound which is needle-shaped and loose in structure, so that the stirring speed needs to be reduced to avoid damaging the crystal structure of the O precipitate and influencing the subsequent reaction treatment rate, but the mixing effect is influenced by too low stirring speed, and the sulfate radical removal rate can be reduced; based on the method, the addition amount of aluminum chloride and the reaction stirring speed are optimally designed, so that the treatment cost is reduced, the removal rate of sulfate radicals can reach more than 90%, the problems of nitrogen removal, phosphorus removal and sulfur reduction of fermentation wastewater are systematically solved, and the removal rates of phosphate radicals and sulfate radicals are improved;
4. in the invention, during filtering treatment, the mixture of bran and diatomite with proper proportion is used as a filtering medium, so that the problems of filter layer fracture, percolation and the like can be effectively avoided; wherein the bran can provide nutritional ingredients such as dietary fiber, protein and the like for crops, and is a high-quality raw material for preparing organic fertilizer; the diatomite has good effects of improving soil, preserving water and preserving soil moisture; the bran and the diatomite have good water absorbability, the filtrate can be fully absorbed in the filtering process, and a large amount of nutrient substances which are easily absorbed by crops exist in clear liquid; therefore, the invention selects the mixture of the bran and the diatomite as the filter medium, which not only can ensure the required filtering effect in the wastewater treatment, but also is closely related to the preparation of organic fertilizer and organic fertilizer cultivation crops by compounding the subsequent solid residues and the filtrate, and promotes the growth of the crops by providing nutrient substances, improving soil and the like;
5. the invention further optimizes the solid slag treatment process, and prepares organic fertilizer by compounding the solid slag obtained after wastewater treatment and clear liquid, the main components of the organic fertilizer are bran, magnesium ammonium phosphate and the like, the organic fertilizer can be utilized by crops through decomposition treatment, but the problems of seedling burning and the like can be caused when the organic fertilizer is not decomposed completely; in addition, the fertilizer needs to be decomposed under the humid condition, and a large amount of nutrient substances which can be directly utilized by crops exist in clear liquid; based on the method, the addition amount of the clear liquid and the mixing and decomposing time of the solid slag and the clear liquid are optimally designed, so that complete decomposition, higher germination rate and bud seedling height can be ensured, and the growth of the bud seedlings can be controlled not to be inhibited;
6. according to the invention, the organic fertilizer compounded by solid residues and clear liquid is used for crop cultivation, the growth of crops can be influenced if the organic fertilizer is not added in an enough amount, and the problems of fertilizer waste, soil pollution and the like can be caused if the organic fertilizer is applied in an excessive amount.
Detailed Description
The technical solution of the present invention will be described in further detail with reference to examples. The following examples are intended to illustrate the invention only and are not intended to limit the scope of the invention. The experimental methods used in the following examples are all conventional methods unless otherwise specified; the reagents and materials used, unless otherwise indicated, are commercially available.
Test material and detection method
Experimental materials:
the bacteria cells in the fermentation broth are separated from the fermentation medium by separation treatment methods such as membrane separation, centrifugal separation or natural sedimentation, and the fermentation wastewater and concentrated bacteria liquid are obtained.
Information on fermentation wastewater before treatment in examples 1 to 3 was as follows:
example 1:
10m3the fermentation wastewater contains 2675ppm of phosphate radical, 2800ppm of ammonia nitrogen and 1320ppm of sulfate radical;
example 2:
15m3fermentation wastewater in which phosphate radical content2950ppm, ammonia nitrogen content 2320ppm, sulfate content 1100 ppm;
example 3:
10m3the fermentation wastewater contains 3520ppm of phosphate radical, 1911ppm of ammonia nitrogen and 1020ppm of sulfate radical;
and (3) quantitative detection:
and (3) detecting the content of ammonia nitrogen: kjeldahl method;
and (3) detecting the content of phosphate radicals: ammonium molybdate spectrophotometry;
sulfate radical content detection: ethylenediaminetetraacetic acid disodium salt titration method.
Example 1
A method of wastewater treatment comprising the steps of:
heating the fermentation wastewater at 70 ℃ for 40min, adding 25kg of magnesium oxide powder into the heated fermentation wastewater, and stirring at 60 ℃ and 40Hz for 30min (nitrogen and phosphorus removal treatment) to obtain an intermediate mixed solution A;
filtering the intermediate mixed liquid A by a plate-and-frame filter device (the filter medium is a mixture of bran and diatomite in a mass ratio of 2: 1), and respectively collecting clear liquid A and 0.5t of solid residue A;
adding 18kg aluminum chloride into the clear solution A, adjusting pH to 9.2 with calcium oxide, stirring at 50 deg.C and 10Hz for 5min (removing sulfur) to obtain intermediate mixed solution B (containing magnesium ammonium phosphate precipitate and compound Ca)6Al2(SO4)3(OH)12·26H2O precipitation);
mixing the intermediate mixed liquid B with a filter medium (a mixture of bran and diatomite in a mass ratio of 2: 1), and filtering by using a plate frame to obtain a clear liquid B and 0.6t of solid residue B;
wherein, the clear liquid B is discharged into a biological sewage treatment system; the solid slag is used for composting.
Through quantitative detection, the concentration of phosphate radical in the clear liquid B is reduced to 107ppm, the concentration of ammonia nitrogen is reduced to 2150ppm, and the concentration of sulfate radical is reduced to 106 ppm.
An organic fertilizer is obtained by compounding solid slag and clear liquid, and comprises the following steps:
adding 40kg of clear liquid B into 1.1t of solid residues (0.5t of solid residues A and 0.6t of solid residues B), and decomposing and composting for 15d by using a plastic film as a heat-insulating layer to obtain the organic fertilizer.
The organic fertilizer is added at a ratio of 0.5g/m2Mixing the added amount with soil, and culturing black bean; after cultivation tracking, black beans are cultivated by the organic fertilizer prepared by compounding solid residues, the germination rate reaches 93%, and the height of the bud seedlings reaches 15 cm.
Example 2
A method of wastewater treatment comprising the steps of:
heating the fermentation wastewater at 100 ℃ for 20min, adding 70kg of magnesium oxide powder into the heated fermentation wastewater, and stirring at 60 ℃ and 60Hz for 40min to obtain an intermediate mixed solution A;
filtering the intermediate mixed liquid A by a plate frame (the filter medium is a mixture of bran and diatomite with the mass ratio of 3: 1), and respectively collecting clear liquid A and 0.65t of solid residue A;
adding 27kg of aluminum chloride into the clear liquid A, adjusting the pH of the solution to 10.3 by using calcium oxide, and then stirring the solution for 10min at the temperature of 40 ℃ and the frequency of 30Hz to obtain an intermediate mixed liquid B;
mixing the intermediate mixed liquid B with a filter medium (a mixture of bran and diatomite in a mass ratio of 3: 1), and filtering by using a plate frame to obtain a clear liquid B and 0.75t of solid residue B;
wherein, the clear liquid B is discharged into a biological sewage treatment system; the solid slag is used for composting.
Through quantitative detection, the concentration of phosphate radicals in the clear liquid B is reduced to 8ppm, the concentration of ammonia nitrogen is reduced to 1716ppm, and the concentration of sulfate radicals is reduced to 55 ppm.
70kg of clear liquid B is added into 1.4t of solid residues (0.65t of solid residues A and 0.75t of solid residues B), a plastic film is used as a heat insulation layer, and compost is decomposed for 20d to obtain the organic fertilizer.
The organic fertilizer is added at a ratio of 0.7g/m2Mixing the added amount with soil, and culturing black bean; after culture tracking, black beans are cultured by the organic fertilizer prepared by compounding solid residues, the germination rate reaches 96%, and the height of the bud seedlings reaches 17 cm.
Example 3
A method of wastewater treatment comprising the steps of:
heating the fermentation wastewater at 80 ℃ for 30min, adding 55kg of magnesium oxide powder into the heated fermentation wastewater, and stirring at 50 ℃ and 60Hz for 40min to obtain an intermediate mixed solution A;
filtering the intermediate mixed liquid A by a plate frame (the filter medium is a mixture of bran and diatomite with the mass ratio of 2: 1), and respectively collecting clear liquid A and 0.7t of solid residue A;
adding 15kg of aluminum chloride into the clear liquid A, adjusting the pH of the solution to 11.1 by using calcium oxide, and then stirring for 5min at 40 ℃ under 20Hz to obtain an intermediate mixed liquid B;
mixing the intermediate mixed liquid B with a filter medium (a mixture of bran and diatomite in a mass ratio of 2: 1), and filtering by using a plate frame to obtain a clear liquid B and 0.7t of solid residue B;
wherein, the clear liquid B is discharged into a biological sewage treatment system; the solid slag is used for composting.
Through quantitative detection, the concentration of phosphate radicals in the clear liquid B is reduced to 5ppm, the concentration of ammonia nitrogen is reduced to 1415ppm, and the concentration of sulfate radicals is reduced to 71 ppm.
Adding 48kg of clear liquid B into 1.4t of solid residues (0.7t of solid residues A and 0.7t of solid residues B), and decomposing the compost for 20d by using a plastic film as a heat-insulating layer to obtain the organic fertilizer.
The organic fertilizer is added at a ratio of 0.5g/m2Mixing the added amount with soil, and culturing black bean; after culture tracking, black beans are cultured by the organic fertilizer prepared by compounding solid residues, the germination rate reaches 95%, and the height of the bud seedlings reaches 15 cm.
Example 4 example 8
Example 4-example 8 differs from the wastewater treatment process described in example 1 in the reaction conditions shown in table 1;
example 4 to example 8 differ from one another in the PO43-/Mg2+The molar ratio is 1: 1. 1: 2. 1: 3. 1: 4. 1: 5, adding magnesium oxide powder.
Quantitative determination of PO in clear solution B obtained by treating wastewater of examples 4 to 84 3-Ammonia nitrogen and SO4 2-The results are shown in Table 1.
TABLE 1
Example 9-example 12
Example 9-example 12 differs from the wastewater treatment process described in example 1 in the reaction conditions shown in table 2;
the difference between the examples 9 and 12 is that in the denitrification and dephosphorization treatment, the stirring rotation speed is respectively 20Hz, 40Hz, 60Hz and 80 Hz.
Quantitative determination of PO in clear solution B obtained by treating wastewater of examples 9 to 124 3-Ammonia nitrogen and SO4 2-The results are shown in Table 2.
TABLE 2
Example 13 example 16
Example 13-example 16 differs from the wastewater treatment process described in example 1 in the reaction conditions shown in table 3;
example 13 to example 16 differ from one another in the SO43-/Al3+The molar ratio is 1: 0.5, 1: 1.0, 1: 1.5, 1: alumina powder was added at a ratio of 2.0.
Quantitative determination of PO in clear solution B obtained by treating wastewater of examples 13 to 164 3-Ammonia nitrogen and SO4 2-The results are shown in Table 3.
TABLE 3
Example 17 example 21
Example 17-example 21 differs from the wastewater treatment process described in example 1 in the reaction conditions shown in table 4;
the difference between examples 17 to 21 is that in the sulfur removal treatment, the stirring rotation speeds were 5Hz, 10Hz, 20Hz, 30Hz, and 40Hz, respectively.
Quantitative determination of PO in clear solution B obtained by treating wastewater of examples 17 to 214 3-Ammonia nitrogen and SO4 2-The results are shown in Table 4.
TABLE 4
Example 22 example 27
Example 22-example 27 the organic fertilizer production process described in example 1 was distinguished by the reaction conditions shown in table 5;
the difference between example 22 and example 27 is that the days of maturity are 0d, 5d, 10d, 15d, 20d, 25d, respectively.
The germination rates and the average heights of the sprouts of the black beans cultured by the organic fertilizers prepared in examples 22 to 27 are shown in table 5.
TABLE 5
Example 28 example 32
Example 28-example 32 differs from the method for producing the organic fertilizer described in example 1 in the reaction conditions shown in table 6;
the difference between example 28 and example 32 is that the amounts of added filtered clear solution were 0%, 3%, 6%, 9%, 12%, respectively.
The germination rates and the average heights of the sprouts of the black beans cultured by the organic fertilizers prepared in the examples 28 to 32 are shown in table 6.
TABLE 6
Example 33 example 37
Example 33-example 37 black beans were bred with the organic fertilizer described in example 1, except for the reaction conditions shown in table 7;
wherein, the embodiment 33 is a comparison example, namely black beans are cultivated without adding organic fertilizer;
example 34 to example 37 differ in that the organic fertilizer is applied in an amount of 0.5g/m, respectively2、1g/m2、1.5g/m2、2g/m2。
The germination rates and the average heights of the sprouts of the black beans cultivated in examples 33 to 37 are shown in Table 7.
TABLE 7
Test example 1bStability test
Taking the fermentation wastewater in example 1 and example 3 as an example, the effluent index of the plate frame clear liquid (clear liquid B) in 3 months is continuously examined to determine the stability of the treatment method of the invention, and the results are shown in Table 8.
TABLE 8
The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above-mentioned embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and embellishments within the scope of the invention may be made by those skilled in the art without departing from the principle of the invention.
Claims (10)
1. A method of wastewater treatment, comprising: magnesium salt is added into the wastewater for denitrification and dephosphorization treatment, and aluminum salt is added for desulfurization treatment.
2. The wastewater treatment process of claim 1, wherein the wastewater treatment process comprises the steps of:
(1) adding magnesium salt into the wastewater, and stirring for reaction to obtain intermediate liquid A;
(2) carrying out solid-liquid separation on the intermediate liquid A to obtain clear liquid A and solid residue A;
(3) adding aluminum salt into the clear liquid A, adjusting the pH of the mixed liquid to be alkaline, and then stirring for reaction to obtain intermediate liquid B;
(4) and carrying out solid-liquid separation on the intermediate liquid B to obtain a clear liquid B and solid residues B.
3. The method of treating wastewater according to claim 1 or 2, wherein the wastewater is subjected to a heating pretreatment before being subjected to a denitrification and dephosphorization treatment by adding magnesium salt.
4. A method for treating waste water according to any of claims 1 to 3, wherein PO is used4 3-/Mg2+The molar ratio is 1: 1-5, adding magnesium salt into the wastewater; preferably, according to PO4 3-/Mg2+The molar ratio is 1: adding magnesium salt in a ratio of 2-5; more preferably, according to PO4 3-/Mg2+The molar ratio is 1: adding magnesium salt at a ratio of 2-4.
5. The method of treating waste water according to any one of claims 1 to 4, wherein the mixture of magnesium salt and waste water is reacted at 20 to 80Hz and 30 to 80 ℃ for 10 to 60min with stirring, preferably 30 to 70Hz and 40 to 70 ℃ for 20 to 50min with stirring, more preferably 40 to 60Hz and 50 to 60 ℃ for 30 to 40min with stirring.
6. According to any of claims 1-5The wastewater treatment method described in the item (3), wherein in the step (3), SO is added4 2-/Al3+The molar ratio is 1: adding aluminum salt in a ratio of 0.5-2.0; preferably, as SO4 2-/Al3+The molar ratio is 1: adding aluminum salt in the proportion of 1.0-2.0; more preferably, as SO4 2-/Al3+The molar ratio is 1: aluminum salt is added in the proportion of 1.0-1.5.
7. The method of treating wastewater according to any of claims 1 to 6, wherein in the step (3), the mixed solution is stirred and reacted at 20 to 60 ℃ for 2 to 15min at 5 to 40Hz, preferably 10 to 35Hz, and 30 to 50 ℃ for 5 to 10min, more preferably 20 to 30Hz, and 35 to 45 ℃ for 6 to 8 min.
8. The wastewater treatment method according to any one of claims 1 to 7, wherein the solid-liquid separation in step (2) and step (4) is performed by any one of plate-and-frame filtration, rotary-strand filtration and natural sedimentation, preferably plate-and-frame filtration.
9. An organic fertilizer is obtained by composting solid residue A and/or solid residue B;
wherein the solid slag A and/or the solid slag B are obtained by treating the wastewater by using the wastewater treatment method according to any one of claims 1 to 8.
10. Use of the organic fertilizer of claim 9 in crop cultivation.
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