CN115259595B - Method for promoting sludge rich in chemical phosphorus precipitation to release phosphorus and produce methane by using high-sulfur agricultural waste - Google Patents
Method for promoting sludge rich in chemical phosphorus precipitation to release phosphorus and produce methane by using high-sulfur agricultural waste Download PDFInfo
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- CN115259595B CN115259595B CN202210881160.6A CN202210881160A CN115259595B CN 115259595 B CN115259595 B CN 115259595B CN 202210881160 A CN202210881160 A CN 202210881160A CN 115259595 B CN115259595 B CN 115259595B
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- 239000010802 sludge Substances 0.000 title claims abstract description 72
- 229910052698 phosphorus Inorganic materials 0.000 title claims abstract description 62
- 239000011574 phosphorus Substances 0.000 title claims abstract description 62
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 title claims abstract description 59
- 229910052717 sulfur Inorganic materials 0.000 title claims abstract description 48
- 239000011593 sulfur Substances 0.000 title claims abstract description 48
- 239000002154 agricultural waste Substances 0.000 title claims abstract description 43
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 title claims abstract description 40
- 238000000034 method Methods 0.000 title claims abstract description 31
- 239000000126 substance Substances 0.000 title claims abstract description 18
- 238000001556 precipitation Methods 0.000 title claims abstract description 17
- 230000001737 promoting effect Effects 0.000 title claims abstract description 7
- 230000029087 digestion Effects 0.000 claims abstract description 37
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 24
- 229910052742 iron Inorganic materials 0.000 claims abstract description 11
- 239000007787 solid Substances 0.000 claims abstract description 7
- 238000007789 sealing Methods 0.000 claims abstract description 6
- MBMLMWLHJBBADN-UHFFFAOYSA-N Ferrous sulfide Chemical compound [Fe]=S MBMLMWLHJBBADN-UHFFFAOYSA-N 0.000 claims abstract description 5
- 238000001035 drying Methods 0.000 claims abstract description 4
- 238000000227 grinding Methods 0.000 claims abstract description 3
- 239000000758 substrate Substances 0.000 claims abstract description 3
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims description 32
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 17
- 239000000843 powder Substances 0.000 claims description 13
- 230000008569 process Effects 0.000 claims description 13
- 229910052757 nitrogen Inorganic materials 0.000 claims description 9
- 238000011084 recovery Methods 0.000 claims description 9
- 240000002791 Brassica napus Species 0.000 claims description 6
- 240000007124 Brassica oleracea Species 0.000 claims description 6
- 235000003899 Brassica oleracea var acephala Nutrition 0.000 claims description 6
- 235000011301 Brassica oleracea var capitata Nutrition 0.000 claims description 6
- 235000001169 Brassica oleracea var oleracea Nutrition 0.000 claims description 6
- 239000010865 sewage Substances 0.000 claims description 6
- 239000006228 supernatant Substances 0.000 claims description 6
- 235000004977 Brassica sinapistrum Nutrition 0.000 claims description 5
- 150000003839 salts Chemical class 0.000 claims description 5
- 238000003756 stirring Methods 0.000 claims description 5
- AZDRQVAHHNSJOQ-UHFFFAOYSA-N alumane Chemical class [AlH3] AZDRQVAHHNSJOQ-UHFFFAOYSA-N 0.000 claims description 3
- 244000291564 Allium cepa Species 0.000 claims description 2
- 235000002732 Allium cepa var. cepa Nutrition 0.000 claims description 2
- 240000002234 Allium sativum Species 0.000 claims description 2
- 235000011299 Brassica oleracea var botrytis Nutrition 0.000 claims description 2
- 235000017647 Brassica oleracea var italica Nutrition 0.000 claims description 2
- 240000003259 Brassica oleracea var. botrytis Species 0.000 claims description 2
- 244000060011 Cocos nucifera Species 0.000 claims description 2
- 235000013162 Cocos nucifera Nutrition 0.000 claims description 2
- 240000008790 Musa x paradisiaca Species 0.000 claims description 2
- 235000018290 Musa x paradisiaca Nutrition 0.000 claims description 2
- 244000000231 Sesamum indicum Species 0.000 claims description 2
- 235000003434 Sesamum indicum Nutrition 0.000 claims description 2
- 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 description 2
- 238000009388 chemical precipitation Methods 0.000 claims description 2
- 235000004611 garlic Nutrition 0.000 claims description 2
- 229910052588 hydroxylapatite Inorganic materials 0.000 claims description 2
- XYJRXVWERLGGKC-UHFFFAOYSA-D pentacalcium;hydroxide;triphosphate Chemical compound [OH-].[Ca+2].[Ca+2].[Ca+2].[Ca+2].[Ca+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O XYJRXVWERLGGKC-UHFFFAOYSA-D 0.000 claims description 2
- 229910052567 struvite Inorganic materials 0.000 claims description 2
- 235000020238 sunflower seed Nutrition 0.000 claims description 2
- 239000002699 waste material Substances 0.000 abstract description 6
- 239000013043 chemical agent Substances 0.000 abstract description 5
- 238000004064 recycling Methods 0.000 abstract description 5
- 230000008901 benefit Effects 0.000 abstract description 4
- 239000002910 solid waste Substances 0.000 abstract description 3
- 230000007613 environmental effect Effects 0.000 abstract description 2
- WBJZTOZJJYAKHQ-UHFFFAOYSA-K iron(3+) phosphate Chemical compound [Fe+3].[O-]P([O-])([O-])=O WBJZTOZJJYAKHQ-UHFFFAOYSA-K 0.000 description 12
- 238000004519 manufacturing process Methods 0.000 description 10
- 239000005955 Ferric phosphate Substances 0.000 description 9
- 229940032958 ferric phosphate Drugs 0.000 description 9
- 229910000399 iron(III) phosphate Inorganic materials 0.000 description 9
- 229910019142 PO4 Inorganic materials 0.000 description 5
- 239000007789 gas Substances 0.000 description 5
- 239000010452 phosphate Substances 0.000 description 5
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 4
- KAEAMHPPLLJBKF-UHFFFAOYSA-N iron(3+) sulfide Chemical compound [S-2].[S-2].[S-2].[Fe+3].[Fe+3] KAEAMHPPLLJBKF-UHFFFAOYSA-N 0.000 description 4
- 238000002156 mixing Methods 0.000 description 4
- DPTATFGPDCLUTF-UHFFFAOYSA-N phosphanylidyneiron Chemical class [Fe]#P DPTATFGPDCLUTF-UHFFFAOYSA-N 0.000 description 4
- -1 phosphorus compound Chemical class 0.000 description 4
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 description 3
- 229910000037 hydrogen sulfide Inorganic materials 0.000 description 3
- 229910000398 iron phosphate Inorganic materials 0.000 description 3
- 229910021645 metal ion Inorganic materials 0.000 description 3
- 235000015097 nutrients Nutrition 0.000 description 3
- 239000002244 precipitate Substances 0.000 description 3
- 235000013311 vegetables Nutrition 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- VTLYFUHAOXGGBS-UHFFFAOYSA-N Fe3+ Chemical compound [Fe+3] VTLYFUHAOXGGBS-UHFFFAOYSA-N 0.000 description 2
- 241000282414 Homo sapiens Species 0.000 description 2
- 102000005298 Iron-Sulfur Proteins Human genes 0.000 description 2
- 108010081409 Iron-Sulfur Proteins Proteins 0.000 description 2
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 description 2
- URRHWTYOQNLUKY-UHFFFAOYSA-N [AlH3].[P] Chemical class [AlH3].[P] URRHWTYOQNLUKY-UHFFFAOYSA-N 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- 238000012271 agricultural production Methods 0.000 description 2
- 239000003513 alkali Substances 0.000 description 2
- 150000001720 carbohydrates Chemical class 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 239000008139 complexing agent Substances 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000007062 hydrolysis Effects 0.000 description 2
- 238000006460 hydrolysis reaction Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 125000001741 organic sulfur group Chemical group 0.000 description 2
- 230000020477 pH reduction Effects 0.000 description 2
- 230000002195 synergetic effect Effects 0.000 description 2
- 235000006008 Brassica napus var napus Nutrition 0.000 description 1
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 1
- 244000068988 Glycine max Species 0.000 description 1
- 235000010469 Glycine max Nutrition 0.000 description 1
- 229920000388 Polyphosphate Polymers 0.000 description 1
- CKUAXEQHGKSLHN-UHFFFAOYSA-N [C].[N] Chemical compound [C].[N] CKUAXEQHGKSLHN-UHFFFAOYSA-N 0.000 description 1
- YUWBVKYVJWNVLE-UHFFFAOYSA-N [N].[P] Chemical compound [N].[P] YUWBVKYVJWNVLE-UHFFFAOYSA-N 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000001112 coagulating effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 235000013399 edible fruits Nutrition 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 235000020774 essential nutrients Nutrition 0.000 description 1
- 239000010903 husk Substances 0.000 description 1
- 230000003301 hydrolyzing effect Effects 0.000 description 1
- 230000005764 inhibitory process Effects 0.000 description 1
- 235000001705 insufficient nutrition Nutrition 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 150000002632 lipids Chemical class 0.000 description 1
- 150000002736 metal compounds Chemical class 0.000 description 1
- 230000000813 microbial effect Effects 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
- 230000035764 nutrition Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000001205 polyphosphate Substances 0.000 description 1
- 235000011176 polyphosphates Nutrition 0.000 description 1
- 229920001021 polysulfide Polymers 0.000 description 1
- 102000004169 proteins and genes Human genes 0.000 description 1
- 108090000623 proteins and genes Proteins 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000013049 sediment Substances 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 150000004666 short chain fatty acids Chemical class 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
- 238000004065 wastewater treatment Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 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
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/02—Biological treatment
- C02F11/04—Anaerobic treatment; Production of methane by such processes
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
-
- 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
-
- 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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E50/00—Technologies for the production of fuel of non-fossil origin
- Y02E50/30—Fuel from waste, e.g. synthetic alcohol or diesel
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Hydrology & Water Resources (AREA)
- Water Supply & Treatment (AREA)
- Organic Chemistry (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Health & Medical Sciences (AREA)
- General Chemical & Material Sciences (AREA)
- Molecular Biology (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Treatment Of Sludge (AREA)
Abstract
The invention discloses a method for promoting sludge rich in chemical phosphorus precipitation to release phosphorus and produce methane by utilizing high-sulfur agricultural wastes, and belongs to the field of sludge recycling treatment. The method comprises the following steps: crushing, drying and grinding high-sulfur agricultural wastes, adding sludge rich in chemical phosphorus precipitation into an anaerobic digestion tank, adding the high-sulfur agricultural wastes according to a certain sulfur-iron molar ratio according to the content of iron in the sludge, inoculating seed sludge into the tank according to the total solid content (TS) of a substrate, removing air, sealing the digestion tank, and co-digesting the sludge and the high-sulfur agricultural wastes for 20-50 days at 25-40 ℃. Compared with the traditional sludge phosphorus release method, the method provided by the invention follows the principle of treating waste with waste, avoids adding chemical agents, realizes reduction, harmlessness and recycling of two solid wastes, reduces treatment cost, and has good environmental benefit and engineering application prospect.
Description
Technical Field
The invention relates to the field of sludge recycling treatment, in particular to a method for promoting sludge phosphorus release and methane production of chemical phosphorus-rich precipitation by utilizing agricultural wastes with high sulfur content.
Background
Phosphorus is an essential nutrient element for human beings and is indispensable in the production and life of human beings. In daily life, a large amount of phosphorus is discharged into municipal sewage. As a byproduct of the biological wastewater treatment process, the excess sludge tends to be enriched in about 90% of the phosphorus in the wastewater, and can be considered an important phosphorus resource pool. The sludge has high water content, is rich in a large amount of toxic and harmful substances, is easy to rot and stink, needs to be properly treated, and avoids causing harm to the environment.
Anaerobic digestion is an economical and reliable sludge treatment technology, not only can recover energy in the sludge in the form of methane, but also can release about 30% of phosphorus in the activated sludge, so that the anaerobic digestion is widely applied to the field of sludge phosphorus resource recovery. However, with the popularization of chemical phosphorus removal technology, ferric salt or aluminum salt is added into a sewage treatment plant to carry out coagulating sedimentation to remove phosphorus, and the generated ferric phosphorus compound or aluminum phosphorus compound is mixed with activated sludge to form surplus sludge containing chemical phosphorus sediment. The iron phosphorus compounds and the aluminum phosphorus compounds are difficult to release phosphorus in the anaerobic digestion stage, and the phosphorus release rate is less than 10 percent; in addition, excessive metal ions brought by the adding agent can reprecipitate phosphorus released in the anaerobic digestion process, so that the difficulty of sludge phosphorus recovery is increased.
In order to increase the phosphorus release rate of the sludge containing chemical phosphorus, chemical agents such as strong acid, strong alkali, complexing agents and the like are generally added. The chemical agent is capable of disrupting the microbial cell structure, hydrolyzing the polyphosphate stored within the cell to phosphate, releasing the phosphate to the supernatant, and dissolving part of the phosphorus in the metal compound. However, they are not effective in avoiding secondary precipitation of metal ions and phosphorus in the supernatant, and also increase the operating cost of sewage treatment plants, causing corrosion of pipes and equipment. Therefore, there is a great need to provide an anaerobic digestion technology for economically and effectively recovering phosphorus in sludge containing iron phosphorus compounds and aluminum phosphorus compounds.
As one of the world agricultural countries, the agricultural production of China gradually develops to market and intensify, and a large amount of agricultural wastes are generated in the production, transportation and sales processes. Agricultural waste contains a large amount of unutilized nutrients such as carbohydrate, and the phenomenon of excessive acidification and methane production inhibition can occur in the anaerobic digestion alone because the nutrients are easily decomposed by microorganisms and have high hydrolysis and acidification speeds. The carbon-nitrogen ratio (C/N) of the sludge is low, and the problems of insufficient nutrition, difficult hydrolysis, low phosphorus release rate, low gas production rate and the like exist in the process of single anaerobic digestion. The synergistic anaerobic digestion method can effectively avoid the defects, and the synergistic anaerobic digestion of the agricultural waste and the residual sludge by mixing the agricultural waste and the residual sludge in proportion can play the roles of regulating the nutrition balance, stabilizing the pH value and improving the gas production rate.
The high-sulfur agricultural waste contains a large amount of carbon (C) and resources such as nitrogen (N), sulfur (S) and the like, and the invention can balance the C/N and improve the gas yield by cooperating with the residual sludge for anaerobic digestion, and the sulfur in the high-sulfur agricultural waste can release the phosphorus in the iron-phosphorus compound. After the organic sulfur in the agricultural wastes with high sulfur content enters the anaerobic digestion system, the organic sulfur is converted into sulfide (S 2- 、HS - 、H 2 S) S; the sulfide can reduce ferric iron phosphorus compound (Fe (III) -P) into ferrous iron phosphorus compound (Fe (II) -P), and replace phosphorus in Fe (II) -P to generate ferric sulfide (FeS) precipitate; feS can be combined with polysulfide (S n 2- ) Or the elemental sulfur (S) continues to react to finally generate the iron-sulfur compound (FeS) 2 FeS) to release soluble phosphate. Because the iron-sulfur compound has better precipitation stability, iron and sulfur can be effectively fixed, the secondary precipitation of soluble phosphate and iron is avoided, and the escape of harmful gas hydrogen sulfide is reduced.
The invention relates to a sludge recycling method for treating waste by waste, which realizes the recovery of energy and resources in two solid wastes. In the implementation process, only the phosphorus recovery auxiliary facilities are needed to be added at the later stage of the traditional anaerobic digestion process, and the method is simple and easy to implement and has good environmental benefit and engineering application prospect.
Disclosure of Invention
The invention aims to solve the problems and provide a method for promoting the phosphorus release and methane production of sludge rich in chemical phosphorus precipitation by utilizing high-sulfur agricultural wastes, which can promote the phosphorus release and avoid the addition of chemical agents while improving the yield of sludge methane; the production of hydrogen sulfide gas in the anaerobic digestion process is reduced, the methane quality is improved, the environmental pollution is reduced, and the energy and the nutrients in the sludge are recycled in a green and efficient way.
In order to achieve the above purpose, the present invention provides the following technical solutions:
the invention provides a method for promoting sludge rich in chemical phosphorus precipitation to release phosphorus and produce methane by utilizing high-sulfur agricultural wastes, which comprises the following steps:
(1) Crushing and drying agricultural wastes with high sulfur content, and grinding the agricultural wastes into powder;
(2) According to the iron content in the sludge and the sulfur content in the high-sulfur agricultural waste, adding the sludge rich in chemical phosphorus precipitation and the high-sulfur agricultural waste into an anaerobic digestion tank according to a certain sulfur-iron molar ratio, and removing air after inoculating seed sludge to form an anaerobic environment, and sealing the digestion tank;
(3) Co-digesting the sludge and the agricultural wastes with high sulfur content for 20-50 days at the temperature of 25-40 ℃, stirring digestate in the co-digestion process and recovering methane;
(4) After the co-digestion is completed, the nitrogen and phosphorus resources in the supernatant are recovered.
In one embodiment of the invention, the high sulfur content agricultural waste in the step (1) is a waste sulfur-containing crop in agricultural production and resident life, and the sulfur content is 0.1-3%; including but not limited to oilseed rape seed residue, sunflower seed residue, soybean residue, sesame seed residue, vegetable cabbage, garlic, onion, broccoli, coconut husk of fruit drinks, banana peel, coffee grounds, etc.
In one embodiment of the present invention, in the step (1), the agricultural waste having high sulfur content is preferably crushed into a lump of 1 to 5 cm.
In one embodiment of the present invention, in step (1), drying is preferably carried out at a temperature of 35 to 70 ℃.
In one embodiment of the present invention, in step (1), the powder preferably has a particle size of less than 0.2. 0.2 mm.
In one embodiment of the invention, the sludge rich in chemical phosphorus precipitation in the step (2) is surplus sludge generated after chemical phosphorus removal by adding ferric salt or simultaneously adding ferric salt and aluminum salt into a sewage treatment plant.
In one embodiment of the present invention, the amount of the high sulfur-containing agricultural waste added according to the ratio of chemical precipitation to sulfur in the step (2) is that the molar ratio of the sulfur content of the agricultural waste to the iron content of the sludge is 1:1-2:1.
in one embodiment of the present invention, in step (3), the ratio of the Total Solids (TS) of the substrate to the Total Solids (TS) of the seed sludge is 1:1-5:1.
in one embodiment of the present invention, the recovery form of the nitrogen and phosphorus resources in step (4) includes, but is not limited to, recovery by means of struvite, hydroxyapatite, and the like.
The invention also provides application of the method in the field of sludge treatment.
In summary, the invention has the following beneficial effects:
1. through the co-digestion of the excess sludge and the agricultural waste, a large amount of methane can be generated and used as clean energy, and simultaneously, the carbon recovery in the two solid wastes is realized, so that the economic benefit of a sewage treatment plant is improved, and the energy shortage problem is relieved.
2. The defect of high operation cost and equipment corrosion caused by a sludge phosphorus release mode of adding chemical agents (adding phosphorus release agents such as strong acid, strong alkali and complexing agents) is avoided, and the problem of difficult phosphorus release in iron phosphorus precipitation is solved. Compared with the surplus sludge, the agricultural waste has higher content of carbohydrate, protein and lipid, is easier to hydrolyze to generate high-concentration volatile short-chain fatty acid, ensures that an anaerobic digestion system is slightly acidic, and promotes the release of phosphorus in the iron-phosphorus sludge.
3. The sulfur in the high-sulfur waste crops can form a precipitate with iron in the ferric phosphate in the anaerobic digestion process, so that the release of phosphorus in the ferric phosphate precipitate is further promoted, the secondary precipitation of soluble phosphate and metal ions is avoided, the effective recovery of phosphorus resources in sludge is realized, the hydrogen sulfide pollution in the anaerobic digestion process is also relieved, and the quality of methane is improved. The invention extends the traditional anaerobic digestion technology, not only can recycle methane energy, but also can obtain high-nitrogen phosphorus supernatant, and can recycle sludge phosphorus only by adding a supernatant liquid nitrogen phosphorus recycling facility after solid-liquid separation, thereby having practical application value.
Drawings
FIG. 1 is a schematic diagram of the anaerobic co-digestion process using high sulfur agricultural waste and ferric phosphate containing sludge in the present invention.
FIG. 2 is a graph showing the variation of phosphorus release amount in the anaerobic co-digestion process of agricultural wastes with high sulfur content and sludge containing ferric phosphate.
FIG. 3 is a graph of methane yield change during anaerobic co-digestion of high sulfur agricultural waste and ferric phosphate containing sludge.
Detailed Description
The advantages and technical features of the present invention will become more apparent by the following description of the present invention with reference to the accompanying examples and drawings. Embodiments of the invention are not limited thereto, and the described embodiments are merely some, but not all, examples of the invention. All other embodiments, based on the examples herein, which are within the scope of the invention as defined by the claims, will be within the scope of the invention as defined by the claims.
Example 1
Mixing 370 mL iron phosphate-containing sludge and 80 mL kinds of sludge in an anaerobic digestion tank, adding 2.3 g rapeseed cake powder (the molar ratio of sulfur in the rapeseed cake powder to iron in the sludge is 2:1), uniformly stirring, aerating by using nitrogen, removing air in the system, sealing the digestion tank, and digesting for 40 days at 35 ℃. After 21 days of anaerobic digestion, the ferric phosphate-containing sludge co-digested with rapeseed cake powder had a 51.3% increase in soluble orthophosphorus concentration compared to ferric phosphate-containing sludge without anaerobic digestion with agricultural waste (fig. 2). After 40 days of anaerobic digestion, the co-digestion with rapeseed cake powder increased the methane production per gram of volatile suspended solids from 133.7. 133.7 mL to 228.3. 228.3 mL, by 70.7% (fig. 3).
Example 2
Mixing 370 mL iron phosphate-containing sludge and 80 mL kinds of sludge in an anaerobic digestion tank, adding 2.4 g cabbage powder (the molar ratio of sulfur in the cabbage powder to iron in the sludge is 2:1), uniformly stirring, aerating with nitrogen, removing air in the system, sealing the digestion tank, and digesting for 40 days at 35 ℃. After 21 days of anaerobic digestion, the ferric phosphate-containing sludge co-digested with white vegetable powder had 26.1% higher soluble orthophosphorus concentration than the ferric phosphate-containing sludge without the anaerobic digestion of agricultural waste (fig. 2). After 40 days of anaerobic digestion, co-digestion with white vegetable powder increased methane production per gram of volatile suspended solids from 133.7 mL to 229.1 mL by 71.3% (fig. 3).
Example 3
Mixing 370 mL iron phosphate-containing sludge and 80 mL kinds of sludge in an anaerobic digestion tank, adding 1.2 g cabbage powder (the molar ratio of sulfur in the cabbage powder to iron in the sludge is 1:1), uniformly stirring, aerating by using nitrogen, removing air in the system, sealing the digestion tank, and digesting for 40 days at 35 ℃. By operating according to the method of the experimental example 3, after 21 days of anaerobic digestion, the solubility of the normal phosphorus can be improved by more than 10 percent without heightening the sulfur-containing agricultural waste, and after 40 days of anaerobic digestion, the methane yield can be improved by more than 30 percent.
The foregoing is a description of the principles and preferred embodiments of the present invention, but is not intended to be limiting, since various changes and modifications can be made by one skilled in the art without departing from the spirit and scope of the invention, which is defined in the appended claims.
Claims (4)
1. A method for promoting sludge rich in chemical phosphorus precipitation to release phosphorus and produce methane by using high-sulfur agricultural wastes, which is characterized by comprising the following steps:
(1) Crushing and drying agricultural wastes with high sulfur content, and grinding the agricultural wastes into powder;
(2) According to the iron content in the sludge and the sulfur content in the high-sulfur agricultural waste, adding the sludge rich in chemical phosphorus precipitation and the high-sulfur agricultural waste into an anaerobic digestion tank according to a certain sulfur-iron molar ratio, and removing air after inoculating seed sludge to form an anaerobic environment, and sealing the digestion tank;
(3) Co-digesting the sludge and the agricultural wastes with high sulfur content for 20-50 days at the temperature of 25-40 ℃, stirring digestate in the co-digestion process and recovering methane;
(4) After the co-digestion is finished, recovering nitrogen and phosphorus resources in the supernatant;
wherein the sulfur content of the high sulfur agricultural waste in the step (1) is 0.1-3%, and the high sulfur agricultural waste comprises one or more of rapeseed residue, sunflower seed residue, sesame residue, cabbage, garlic, onion, broccoli, coconut shell, banana peel and coffee grounds;
the amount of the high-sulfur agricultural waste added according to the ratio of chemical precipitation to sulfur in the step (2) is that the molar ratio of the sulfur content of the agricultural waste to the iron content of the sludge is 1:1-2:1, a step of;
in step (3), the ratio of the Total Solids (TS) of the substrate to the Total Solids (TS) of the seed sludge is 1:1-5:1.
2. the method according to claim 1, wherein the sludge rich in chemical phosphorus precipitation is surplus sludge produced after chemical phosphorus removal by adding ferric salt or simultaneously adding ferric salt and aluminum salt to a sewage treatment plant.
3. The method according to claim 1 or 2, wherein the recovery of the nitrogen and phosphorus resources in step (4) is performed by means of struvite or hydroxyapatite.
4. Use of the method according to any one of claims 1 to 3 in the field of sludge treatment.
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