CN116395904A - Method for recycling nitrogen and phosphorus resources in wastewater - Google Patents
Method for recycling nitrogen and phosphorus resources in wastewater Download PDFInfo
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- CN116395904A CN116395904A CN202310554647.8A CN202310554647A CN116395904A CN 116395904 A CN116395904 A CN 116395904A CN 202310554647 A CN202310554647 A CN 202310554647A CN 116395904 A CN116395904 A CN 116395904A
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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 79
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 title claims abstract description 52
- 238000000034 method Methods 0.000 title claims abstract description 52
- 229910052698 phosphorus Inorganic materials 0.000 title claims abstract description 52
- 239000011574 phosphorus Substances 0.000 title claims abstract description 52
- 229910052757 nitrogen Inorganic materials 0.000 title claims abstract description 43
- 238000004064 recycling Methods 0.000 title claims abstract description 26
- 239000010802 sludge Substances 0.000 claims abstract description 55
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 53
- IOVCWXUNBOPUCH-UHFFFAOYSA-M Nitrite anion Chemical compound [O-]N=O IOVCWXUNBOPUCH-UHFFFAOYSA-M 0.000 claims abstract description 42
- 238000006243 chemical reaction Methods 0.000 claims abstract description 40
- CKMXBZGNNVIXHC-UHFFFAOYSA-L ammonium magnesium phosphate hexahydrate Chemical compound [NH4+].O.O.O.O.O.O.[Mg+2].[O-]P([O-])([O-])=O CKMXBZGNNVIXHC-UHFFFAOYSA-L 0.000 claims abstract description 33
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 claims abstract description 29
- 238000002425 crystallisation Methods 0.000 claims abstract description 29
- 229910052567 struvite Inorganic materials 0.000 claims abstract description 28
- 230000008025 crystallization Effects 0.000 claims abstract description 26
- 230000000813 microbial effect Effects 0.000 claims abstract description 22
- 238000001556 precipitation Methods 0.000 claims abstract description 21
- 239000011777 magnesium Substances 0.000 claims abstract description 18
- 229910019142 PO4 Inorganic materials 0.000 claims abstract description 14
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 claims abstract description 14
- 239000010452 phosphate Substances 0.000 claims abstract description 14
- 238000011084 recovery Methods 0.000 claims abstract description 10
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims abstract description 9
- 229910052749 magnesium Inorganic materials 0.000 claims abstract description 9
- TWRXJAOTZQYOKJ-UHFFFAOYSA-L Magnesium chloride Chemical compound [Mg+2].[Cl-].[Cl-] TWRXJAOTZQYOKJ-UHFFFAOYSA-L 0.000 claims description 18
- 239000013078 crystal Substances 0.000 claims description 18
- 241000091581 Sulfurovum Species 0.000 claims description 15
- 230000014759 maintenance of location Effects 0.000 claims description 10
- 241000470059 Vulcanibacillus Species 0.000 claims description 9
- 229910001629 magnesium chloride Inorganic materials 0.000 claims description 9
- 230000035484 reaction time Effects 0.000 claims description 8
- CSNNHWWHGAXBCP-UHFFFAOYSA-L Magnesium sulfate Chemical compound [Mg+2].[O-][S+2]([O-])([O-])[O-] CSNNHWWHGAXBCP-UHFFFAOYSA-L 0.000 claims description 4
- 239000000395 magnesium oxide Substances 0.000 claims description 2
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims description 2
- 229910052943 magnesium sulfate Inorganic materials 0.000 claims description 2
- 235000019341 magnesium sulphate Nutrition 0.000 claims description 2
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 claims description 2
- 238000000746 purification Methods 0.000 claims description 2
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 abstract description 23
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 abstract description 6
- 230000009471 action Effects 0.000 abstract description 3
- 230000008901 benefit Effects 0.000 abstract description 3
- 230000001925 catabolic effect Effects 0.000 abstract description 3
- 238000006722 reduction reaction Methods 0.000 abstract description 3
- 230000000052 comparative effect Effects 0.000 description 10
- 238000001514 detection method Methods 0.000 description 8
- 238000000855 fermentation Methods 0.000 description 8
- 230000008569 process Effects 0.000 description 7
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 6
- 238000012258 culturing Methods 0.000 description 6
- 230000004151 fermentation Effects 0.000 description 5
- 239000007788 liquid Substances 0.000 description 5
- 239000010865 sewage Substances 0.000 description 5
- 241000520300 Desulfocapsa Species 0.000 description 4
- 238000001179 sorption measurement Methods 0.000 description 4
- 241000894006 Bacteria Species 0.000 description 3
- 239000003463 adsorbent Substances 0.000 description 3
- 229910021529 ammonia Inorganic materials 0.000 description 3
- 230000003647 oxidation Effects 0.000 description 3
- 238000007254 oxidation reaction Methods 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- JLVVSXFLKOJNIY-UHFFFAOYSA-N Magnesium ion Chemical compound [Mg+2] JLVVSXFLKOJNIY-UHFFFAOYSA-N 0.000 description 2
- 229910002651 NO3 Inorganic materials 0.000 description 2
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 description 2
- 230000001651 autotrophic effect Effects 0.000 description 2
- 239000003153 chemical reaction reagent Substances 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000007791 liquid phase Substances 0.000 description 2
- 229910001425 magnesium ion Inorganic materials 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 230000001360 synchronised effect Effects 0.000 description 2
- 238000004065 wastewater treatment Methods 0.000 description 2
- 239000002028 Biomass Substances 0.000 description 1
- 229910017958 MgNH Inorganic materials 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- -1 ammonium ions Chemical class 0.000 description 1
- 150000003863 ammonium salts Chemical class 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000009395 breeding Methods 0.000 description 1
- 230000001488 breeding effect Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000009388 chemical precipitation Methods 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 239000010840 domestic wastewater Substances 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000012851 eutrophication Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000003337 fertilizer Substances 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 229910021389 graphene Inorganic materials 0.000 description 1
- 230000007062 hydrolysis Effects 0.000 description 1
- 238000006460 hydrolysis reaction Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 159000000003 magnesium salts Chemical class 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 150000004666 short chain fatty acids Chemical class 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
Classifications
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- 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
- 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
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
-
- 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
- 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
- C02F2101/166—Nitrites
-
- C—CHEMISTRY; METALLURGY
- 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
- C02F3/28—Anaerobic digestion processes
- C02F3/2813—Anaerobic digestion processes using anaerobic contact processes
-
- 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
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
Abstract
The invention provides a method for recycling nitrogen and phosphorus resources in wastewater, which comprises the step of utilizing activated sludge to carry out microbial reaction on the wastewater to obtain intermediate water. According to the invention, sulfur-type catabolic nitrite reduction reaction is carried out on wastewater under the action of activated sludge, sulfide is converted into elemental sulfur, nitrite is converted into ammonia nitrogen, and then a proper amount of magnesium source is added to carry out struvite crystallization reaction with ammonia nitrogen and phosphate, so that struvite crystallization precipitation is collected, and recovery of nitrogen and phosphorus resources in wastewater is realized. Compared with the prior art, the method has the advantages that the treatment time is shorter, ammonia nitrogen and phosphate are not required to be added additionally, and the treatment cost is greatly reduced.
Description
Technical Field
The invention belongs to the technical field of nitrogen and phosphorus-containing wastewater treatment, and relates to a treatment method for extracting nitrogen and phosphorus from wastewater for recycling.
Background
The unidirectional flow of phosphorus from land to sea gradually reduces the conservation amount of land phosphorus resources, and the out-of-standard emission of nitrogen and phosphorus elements in wastewater can cause eutrophication of water body and influence the ecological environment of water area. Therefore, how to realize the effective treatment of the wastewater containing nitrogen and phosphorus and the sustainable utilization of the nitrogen and phosphorus resources in the wastewater become the focus of the current research. Currently, the processes for phosphorus recovery are mainly: chemical precipitation, biological, adsorption, crystallization.
Wherein, the struvite crystallization precipitation method is a method for simultaneously treating and recycling nitrogen and phosphorus resources in the current wastewater treatment plant, and the method forms struvite (MgNH) by controlling magnesium ions, ammonium ions and phosphate ions to be mixed in water according to the ratio of 1:1:1 4 PO 4 ·6H 2 O) precipitation, realizing nitrogen and phosphorus removal and recovery, and the obtained struvite crystal is a high-quality slow-release fertilizer.
CN111333178A discloses a device and a method for enhancing autotrophic nitrogen and synchronous phosphorus recovery of nitrate wastewater by alkaline sludge fermentation, wherein the device comprises an alkaline sludge fermentation coupling short-range denitrification reactor and an autotrophic nitrogen and synchronous phosphorus recovery reactor. The alkaline condition accelerates the hydrolysis and acid production of the residual sludge, generates a small molecular organic carbon source, and releases a large amount of ammonia nitrogen and phosphorus; the denitrification bacteria are promoted to reduce nitrate into nitrite by utilizing short-chain fatty acid under the condition of higher pH and fermentation environment, partial ammonia nitrogen generated by fermentation is removed under the action of anaerobic ammonia oxidation bacteria, and the residual ammonia nitrogen and phosphorus released by fermentation are separated and recovered in a struvite crystal precipitation mode; on the other hand, the formed precipitate is helpful for the granular growth and enrichment of the anaerobic ammonia oxidation bacteria. The invention utilizes the novel short-cut denitrification and anaerobic ammonia oxidation coupling denitrification process to synchronously remove nitrogen pollutants in the sludge and the sewage, realizes the recovery of nitrogen and phosphorus resources, and has important economic and environmental benefits.
CN115634665a discloses a recycling treatment method of cultivation wastewater, which belongs to the technical field of sewage treatment; the method comprises the following steps: s1, carrying out anaerobic fermentation treatment on the breeding wastewater, then carrying out solid-liquid separation, and collecting a liquid phase to obtain anaerobic fermentation wastewater; s2, adding a magnesium source and an adsorbent into the anaerobic fermentation wastewater for crystallization, performing solid-liquid separation, and collecting struvite; collecting liquid phase as waste water after crystallization; s3, carrying out electrolytic treatment on the wastewater after crystallization; the adsorbent comprises the following preparation raw materials: biomass feedstock, graphene oxide, and an iron source. In the recycling treatment method, the adsorption of ammonia nitrogen and phosphate radical is preliminarily realized by utilizing the adsorption effect of the adsorbent; and magnesium ions, ammonia nitrogen and phosphate in the magnesium source can be combined to form struvite during adsorption, so that the recycling of ammonia nitrogen and phosphorus in the cultivation wastewater is realized.
However, because the guanite crystallization grade is low, and the guanite crystallization precipitation method is directly adopted to recycle the nitrogen and phosphorus resources, the addition of reagents such as ammonium salt and magnesium salt is difficult to match the yield and the cost of the guanite crystallization method, the guanite crystallization method is unfavorable for the use of the guanite crystallization method in the aspect of recycling the nitrogen and phosphorus resources in wastewater, and the recycling of the nitrogen resources and the phosphorus resources in other nitrogen source forms is difficult to be considered.
Therefore, how to recover the nitrogen and phosphorus resources in the wastewater, improve the recovery efficiency of the nitrogen and phosphorus resources and reduce the cost of the recovery of the nitrogen and phosphorus resources is a hot problem of research of the technicians in the field.
Disclosure of Invention
Term interpretation:
MLSS refers to the suspended solids concentration of a mixed liquor of wastewater and activated sludge.
HRT refers to hydraulic retention time.
mg S/L means milligrams of S element per liter of liquid.
mg N/L means milligrams of N element per liter of liquid.
mg P/L means milligrams of P element per liter of liquid.
S/N is the molar ratio of sulfur element to nitrogen element in the wastewater.
The invention aims to provide a method for recycling nitrogen and phosphorus resources in wastewater, which solves the problems in the prior art, recycles the nitrogen and phosphorus resources in the wastewater and reduces the cost in the process of recycling the nitrogen and phosphorus resources.
The invention provides a method for recycling nitrogen and phosphorus resources in wastewater aiming at the problems existing in the prior art.
In order to achieve the above purpose, the technical scheme provided by the invention is as follows:
a method for recycling nitrogen and phosphorus resources in wastewater comprises the steps of performing microbial reaction on wastewater by using activated sludge to obtain intermediate water;
wherein the strain of activated sludge comprises Sulfurovum and Vulcanibacillus.
Preferably, the relative abundance of the Sulfurovum reaches more than 60%, and the relative abundance ratio of the Sulfurovum to the Vulcanibacillus is 10-25; further preferably 18 to 23.
The strain in the activated sludge also comprises hydro-genesis corporation and/or Desulfocapsa, and the relative abundance of the strain in the activated sludge reaches more than 5%.
Preferably, the MLSS of the activated sludge is 3-5g/L; further preferably 3-4g/L; most preferably 3.5g/L.
Preferably, the concentration of sulfide in the wastewater is 82.74-564.67mg S/L; the concentration of nitrite is 18.36-145.10mg N/L; the concentration of phosphate is 20.0-227.9mg P/L.
Preferably, the S/N ratio in the wastewater is 1.5-2.1; further preferably 1.5 to 1.8; most preferably 1.6-1.7.
Preferably, the reaction conditions of the microbial reaction are: the pH is 6.5-7.5, the hydraulic retention time is 0.5-15h, and the temperature is 25+/-2 ℃.
Further preferably, the reaction conditions of the microbial reaction are: the pH is 6.9-7.4, and the hydraulic retention time is 13-14h.
The technical scheme of the invention also comprises the following steps: and adding a magnesium source into the intermediate water to perform crystallization reaction to obtain struvite crystal precipitation and purified wastewater.
Preferably, the magnesium source comprises at least one of magnesium chloride, magnesium sulfate and magnesium oxide.
Preferably, the crystallization reaction conditions are: the ratio of Mg to P is 1.2-1.5, the pH is 9.0-9.5, and the reaction time is 20-35min.
Specifically, the method for recycling the nitrogen and phosphorus resources in the wastewater comprises the following steps:
(1) Performing microbial reaction on the wastewater by using activated sludge to obtain intermediate water;
(2) And (3) adding a magnesium source into the intermediate water obtained in the step (1) to perform crystallization reaction, so as to obtain struvite crystal precipitation and purified wastewater.
Compared with the prior art, the invention has the following beneficial effects:
according to the invention, nitrite in the wastewater is reduced into ammonia nitrogen through sulfur-type catabolic nitrite through microbial reaction, so that a large amount of ammonia nitrogen can be provided for the formation of subsequent struvite crystals, and the chemical cost is reduced;
according to the invention, sulfide contained in the wastewater is utilized as an electron donor in the process of reducing the dissimilated nitrite through microbial reaction, the short-cut denitrification process is promoted, and the treatment efficiency of nitrogen element in the wastewater is improved;
according to the invention, through microbial reaction, elemental sulfur contained in the sulfur-type catabolite reduction reaction product is used as struvite crystal nucleus, so that the rate of chemical reaction for forming struvite crystals is improved;
according to the invention, sulfur-type catabolic nitrite reduction reaction is carried out on wastewater under the action of activated sludge, sulfide is converted into elemental sulfur, nitrite is converted into ammonia nitrogen, and then a proper amount of magnesium source is added to carry out struvite crystallization reaction with ammonia nitrogen and phosphate, so that struvite crystallization precipitation is collected, and recovery of nitrogen and phosphorus resources in wastewater is realized. Compared with the prior art, the method has the advantages that the treatment time is shorter, ammonia nitrogen and phosphate are not required to be added additionally, and the treatment cost is greatly reduced.
Detailed Description
The present invention will be described below by way of examples to make the technical solution of the present invention easier to understand and grasp, but the present invention is not limited thereto. The experimental methods described in the following examples are all conventional methods unless otherwise specified; the reagents and materials, unless otherwise specified, are commercially available; and the properties of products from different sources have no significant effect.
The activated sludge is taken from an aerobic tank of a town sewage treatment plant, the sewage of the sewage treatment plant is town domestic wastewater, the COD is about 300-800mg/L, the BOD5 is about 200-600mg/L, the ammonia nitrogen is about 30-50mg/L, the phosphate is about 8-12mg/L, the process is an A2/O process, the HRT is 20 days, and the sludge load is: 0.05-0.2kg BOD5/kg MLVSS.
Example 1
A method for recycling nitrogen and phosphorus resources in wastewater comprises the following steps:
(1) And (3) culturing activated sludge:
domestication of anaerobic sludge by continuous water inlet method using Expanded Granular Sludge Bed (EGSB) reactor, and adding Na into sulfide and nitrite 2 S·9H 2 O and NaNO 2 The form is provided. The sulfide concentration of the feed water was increased from 80mg S/L to 400mg S/L, and nitrite was added at 1.5 according to S/N. The HRT was fixed at 13.33 hours, the pH was controlled at 7.0.+ -. 0.1 and the temperature was controlled at 25.+ -. 2 ℃. And (5) domesticating for 40 days to obtain the activated sludge.
The relative abundance of Sulfurovum in the activated sludge reaches 60%, and the relative abundance ratio of Sulfurovum to Vulcanibacillus is 10.
(2) Intermediate water treatment:
injecting wastewater to be treated into the activated sludge obtained in the step (1) to perform microbial reaction, so as to obtain intermediate water;
wherein the concentration of sulfide in the wastewater to be treated is 564.67mg S/L; the concentration of nitrite is 145.10mg N/L; the concentration of phosphate is 227.9mg P/L; the S/N ratio of sulfide to nitrite is 1.7;
the conditions of the microbial reaction are as follows: MLSS was 3g/L, pH 7.5, hydraulic retention time HRT 15h, temperature 25.+ -. 2 ℃.
The result of water quality detection of intermediate water shows that the nitrite removal rate can reach 98.3%, and the ammonia nitrogen yield is 47.60mg/L.
(3) Struvite crystal precipitation: adding magnesium chloride into the intermediate water obtained in the step (2) according to the Mg/P ratio of 1.5 to carry out crystallization reaction, adjusting the pH value to 9.5, controlling the temperature to 25+/-2 ℃ and the reaction time to 35min to obtain struvite crystal precipitation and purified wastewater;
the indexes of the purified wastewater are detected: the phosphorus removal rate was 22.57%.
Example 2
A method for recycling nitrogen and phosphorus resources in wastewater comprises the following steps:
(1) And (3) culturing activated sludge:
domestication of anaerobic sludge by continuous water inlet method using Expanded Granular Sludge Bed (EGSB) reactor, and adding Na into sulfide and nitrite 2 S·9H 2 O and NaNO 2 The form is provided. The sulfide concentration of the feed water was increased from 80mg S/L to 600mg S/L, and nitrite was added at 2.1 according to S/N. The HRT was fixed at 13.33 hours, the pH was controlled at 7.0.+ -. 0.1 and the temperature was controlled at 25.+ -. 2 ℃. And (5) after the domestication time of 40d, obtaining the activated sludge.
The relative abundance of Sulfurovum in the activated sludge reaches 63%, and the relative abundance ratio of Sulfurovum to Vulcanibacillus is 25.
(2) Intermediate water treatment:
injecting wastewater to be treated into the activated sludge obtained in the step (1) to perform microbial reaction, so as to obtain intermediate water;
wherein the concentration of sulfide in the wastewater to be treated is 82.74mg S/L; the concentration of nitrite is 22.57mg N/L; phosphate concentration is 20mg P/L; the S/N ratio of sulfide to nitrite is 1.6;
the conditions of the microbial reaction are as follows: MLSS was 5g/L, pH 7.0, hydraulic retention time HRT 0.5h, temperature 25.+ -. 2 ℃.
The result of water quality detection of intermediate water shows that the nitrite removal rate can reach 100%, and the ammonia nitrogen yield is 8.24mg/L.
(3) Struvite crystal precipitation:
adding magnesium chloride into the intermediate water obtained in the step (2) according to the Mg/P ratio of 1.5 to carry out crystallization reaction, adjusting the pH value to 9.5, controlling the temperature to 25+/-2 ℃ and the reaction time to 35min to obtain struvite crystal precipitation and purified wastewater;
the indexes of the purified wastewater are detected: the phosphorus removal rate was 28.20%.
Example 3
A method for recycling nitrogen and phosphorus resources in wastewater comprises the following steps:
(1) And (3) culturing activated sludge:
domestication of anaerobic sludge by continuous water inlet method using Expanded Granular Sludge Bed (EGSB) reactor, and adding Na into sulfide and nitrite 2 S·9H 2 O and NaNO 2 The form is provided. The sulfide concentration of the feed water was increased from 80mg S/L to 480mg S/L, and nitrite was added at 1.7 according to S/N. The HRT was fixed for 5 hours, the pH was controlled at 7.0.+ -. 0.1 and the temperature was controlled at 25.+ -. 2 ℃. And (5) after the domestication time of 40d, obtaining the activated sludge.
The relative abundance of Sulfurovum in the activated sludge reaches 67%, and the relative abundance ratio of Sulfurovum to Vulcanibacillus is 15; the relative abundance of hydrogenisma and Desulfocapsa was 5.93% and 5.32%, respectively.
(2) Intermediate water treatment:
injecting wastewater to be treated into the activated sludge obtained in the step (1) to perform microbial reaction, so as to obtain intermediate water;
wherein the concentration of sulfide in the wastewater to be treated is 218.46mg S/L; the concentration of nitrite is 59.70mg N/L; phosphate concentration is 42.19mg P/L; the S/N ratio of sulfide to nitrite is 1.6;
the conditions of the microbial reaction are as follows: MLSS was 4g/L, pH 6.5, hydraulic retention time HRT 14h, temperature 25.+ -. 2 ℃.
The result of water quality detection of intermediate water shows that the nitrite removal rate can reach 100%, and the ammonia nitrogen yield is 14.69mg/L.
(3) Struvite crystal precipitation:
adding magnesium chloride into the intermediate water obtained in the step (2) according to the Mg/P ratio of 1.5 to carry out crystallization reaction, adjusting the pH value to 9.5, controlling the temperature to 25+/-2 ℃ and the reaction time to 35min to obtain struvite crystal precipitation and purified wastewater;
the indexes of the purified wastewater are detected: the phosphorus removal rate was 24.50%.
Example 4
A method for recycling nitrogen and phosphorus resources in wastewater comprises the following steps:
(1) And (3) culturing activated sludge:
domestication of anaerobic sludge by continuous water inlet method using Expanded Granular Sludge Bed (EGSB) reactor, and adding Na into sulfide and nitrite 2 S·9H 2 O and NaNO 2 The form is provided. The concentration of sulfide in the feed water was increased from 80mg S/L to 500mg S/L, and nitrite was added at 2.0 according to S/N. The HRT was fixed for 5 hours, the pH was controlled at 7.0.+ -. 0.1 and the temperature was controlled at 25.+ -. 2 ℃. And (5) after the domestication time of 40d, obtaining the activated sludge.
The relative abundance of Sulfurovum in the activated sludge reaches 65%, and the relative abundance ratio of Sulfurovum to Vulcanibacillus is 23; the relative abundance of hydrogenisma and Desulfocapsa was 5.12% and 5.76%, respectively.
(2) Intermediate water treatment:
injecting wastewater to be treated into the activated sludge obtained in the step (1) to perform microbial reaction, so as to obtain intermediate water;
wherein the concentration of sulfide in the wastewater to be treated is 312.10mg S/L; the concentration of nitrite is 90.54mg N/L; the concentration of phosphate is 162.05mg P/L; the S/N ratio of sulfide to nitrite is 1.5;
the conditions of the microbial reaction are as follows: MLSS was 3.5g/L, pH 7.35, hydraulic retention time HRT 13.33h, temperature 25.+ -. 2 ℃.
The result of water quality detection of intermediate water shows that the nitrite removal rate can reach 91%, and the ammonia nitrogen yield is 29.70mg/L.
(3) Struvite crystal precipitation:
adding magnesium chloride into the intermediate water obtained in the step (2) according to the Mg/P ratio of 1.2 to carry out crystallization reaction, adjusting the pH value to 9.0, controlling the temperature to 25+/-2 ℃ and the reaction time to 20min to obtain struvite crystal precipitation and purified wastewater;
the indexes of the purified wastewater are detected: the phosphorus removal rate was 23.97%.
Example 5
A method for recycling nitrogen and phosphorus resources in wastewater comprises the following steps:
(1) And (3) culturing activated sludge:
domestication of anaerobic sludge by continuous water inlet method using Expanded Granular Sludge Bed (EGSB) reactor, and adding Na into sulfide and nitrite 2 S·9H 2 O and NaNO 2 The form is provided. The sulfide concentration of the feed water was increased from 80mg S/L to 560mg S/L, and nitrite was added at 1.8 according to S/N. The HRT was fixed for 5 hours, the pH was controlled at 7.0.+ -. 0.1 and the temperature was controlled at 25.+ -. 2 ℃. And (5) after the domestication time of 40d, obtaining the activated sludge.
The relative abundance of Sulfurovum in the activated sludge reaches 61%, and the relative abundance ratio of Sulfurovum to Vulcanibacillus is 18; the relative abundance of hydrogenisma and Desulfocapsa was 5.89% and 6.56%, respectively.
(2) Intermediate water treatment:
injecting wastewater to be treated into the activated sludge obtained in the step (1) to perform microbial reaction, so as to obtain intermediate water;
wherein the concentration of sulfide in the wastewater to be treated is 87.40mg S/L; the concentration of nitrite is 18.36mg N/L; phosphate concentration is 20mg P/L; the S/N ratio of sulfide to nitrite is 2.1;
the conditions of the microbial reaction are as follows: MLSS was 4.5g/L, pH 7.29, hydraulic retention time HRT 13h, temperature 25.+ -. 2 ℃.
The result of water quality detection of intermediate water shows that the nitrite removal rate can reach 100%, and the ammonia nitrogen yield is 3.51mg/L.
(3) Struvite crystal precipitation:
adding magnesium chloride into the intermediate water obtained in the step (2) according to the Mg/P ratio of 1.5 to carry out crystallization reaction, adjusting the pH value to 9.5, controlling the temperature to 25+/-2 ℃ and the reaction time to 35min to obtain struvite crystal precipitation and purified wastewater;
the indexes of the purified wastewater are detected: the phosphorus removal rate was 12.50%.
Comparative example 1 method for recycling nitrogen and phosphorus resources in wastewater
The difference between this comparative example and example 1 is that: the culture modes of the activated sludge are different, and specifically:
(1) And (3) culturing activated sludge:
domestication of anaerobic sludge by continuous water inlet method using Expanded Granular Sludge Bed (EGSB) reactor, and adding Na into sulfide and nitrite 2 S·9H 2 O and NaNO 2 The form is provided. The sulfide concentration of the feed water was increased from 80mg S/L to 800mg S/L, and nitrite was added at 3.0 according to S/N. The HRT is fixed for 15 hours, the pH value is controlled to be 7.6+/-0.1, and the temperature is controlled to be 25+/-2 ℃. And (5) after the domestication time of 40d, obtaining the activated sludge.
The types and relative abundance of activated sludge strains are different. Specifically, sulfurovum (28.55%), sulfuromonas (36.81%), and Vulcanibacillus (6.15%).
The detection index of intermediate water: the nitrite removal rate is 100 percent, but no ammonia nitrogen is generated.
Comparative example 2 method for recycling nitrogen and phosphorus resources in wastewater
The difference between this comparative example and example 1 is that: the conditions for the microbial reaction are different, specifically: MLSS was 2.5g/L, pH of the microbial reaction was 8.2, and hydraulic retention time was 16h.
The detection index of intermediate water: the nitrite removal rate is 89.8 percent, and the ammonia nitrogen yield is 3.23mg/L.
Comparative example 3 method for recycling nitrogen and phosphorus resources in wastewater
The difference between this comparative example and example 1 is that: the concentration of sulfide and nitrite in the wastewater is different; S/N is different, specifically: the concentration of sulfide is 478.05mg S/L; the concentration of nitrite was 145.10mg N/L, S/N=1.44.
The detection index of intermediate water: the nitrite removal rate is 88.1 percent, and the ammonia nitrogen yield is 14.61mg/L.
Comparative example 4 method for recycling nitrogen and phosphorus resources in wastewater
The difference between this comparative example and example 3 is that: and (3) filtering the intermediate water in the step (3) to remove elemental sulfur. The method comprises the following steps:
and (3) struvite crystallization precipitation: removing elemental sulfur from the intermediate water obtained in the step (2) through a 0.45 mu m filter membrane, adding magnesium chloride according to the Mg/P ratio of 1.2 to perform crystallization reaction, adjusting the pH value to 9.0, controlling the temperature to 25+/-2 ℃ and the reaction time to 20min, thus obtaining the wastewater after struvite crystallization precipitation and purification.
The indexes of the purified wastewater are detected: the phosphorus removal rate was 7.50%.
Comparative example 5 method for recycling nitrogen and phosphorus resources in wastewater
The difference between this comparative example and example 3 is that: the crystallization reaction conditions in the step (3) are different, and specifically: adding magnesium chloride into the intermediate water obtained in the step (2) at the Mg/P ratio of 1.1 to carry out crystallization reaction, adjusting the pH value to 8.8, and reacting for 40min.
The indexes of the purified wastewater are detected: the phosphorus removal rate was 15.62%.
Finally, it should be noted that the above description is only for illustrating the technical solution of the present invention, and not for limiting the scope of the present invention, and that the simple modification and equivalent substitution of the technical solution of the present invention can be made by those skilled in the art without departing from the spirit and scope of the technical solution of the present invention.
Claims (10)
1. A method for recycling nitrogen and phosphorus resources in wastewater comprises the step of carrying out microbial reaction on the wastewater by using activated sludge to obtain intermediate water, and is characterized in that strains of the activated sludge comprise Sulfurovum and Vulcanibacillus.
2. The method according to claim 1, wherein the relative abundance of sulfurovium is above 60% and the ratio of the relative abundance of sulfurovium and vulcanicilus is between 10 and 25.
3. The method according to claim 1, wherein the activated sludge has an MLSS of 3-5g/L.
4. The method of claim 1, wherein the concentration of sulfide in the wastewater is 82.74-564.67mg S/L; the concentration of nitrite is 18.36-145.10mg N/L; the concentration of phosphate is 20.0-227.9mg P/L.
5. The method of claim 1, wherein the S/N ratio in the wastewater is 1.5-2.1.
6. The method of claim 1, wherein the conditions of the microbial reaction are: the pH is 6.5-7.5, the hydraulic retention time is 0.5-15h, and the temperature is 25+/-2 ℃.
7. The method of claim 1, further comprising the step of: and adding a magnesium source into the intermediate water to perform crystallization reaction, so as to obtain struvite crystal precipitation and purified wastewater.
8. The method of claim 7, wherein the magnesium source is at least one of magnesium chloride, magnesium sulfate, and magnesium oxide.
9. The method of claim 7, wherein the crystallization reaction conditions are: the ratio of Mg to P is 1.2-1.5, the pH is 9.0-9.5, and the reaction time is 20-35min.
10. Use of the method according to any one of claims 1-9 for wastewater purification and recovery of nitrogen and phosphorus resources in wastewater.
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