CN113172069B - Kitchen waste treatment method - Google Patents
Kitchen waste treatment method Download PDFInfo
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- CN113172069B CN113172069B CN202110366109.7A CN202110366109A CN113172069B CN 113172069 B CN113172069 B CN 113172069B CN 202110366109 A CN202110366109 A CN 202110366109A CN 113172069 B CN113172069 B CN 113172069B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09B—DISPOSAL OF SOLID WASTE
- B09B3/00—Destroying solid waste or transforming solid waste into something useful or harmless
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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
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- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12N—MICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA
- C12N11/00—Carrier-bound or immobilised enzymes; Carrier-bound or immobilised microbial cells; Preparation thereof
- C12N11/02—Enzymes or microbial cells immobilised on or in an organic carrier
- C12N11/08—Enzymes or microbial cells immobilised on or in an organic carrier the carrier being a synthetic polymer
- C12N11/089—Enzymes or microbial cells immobilised on or in an organic carrier the carrier being a synthetic polymer obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
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- C12N11/00—Carrier-bound or immobilised enzymes; Carrier-bound or immobilised microbial cells; Preparation thereof
- C12N11/02—Enzymes or microbial cells immobilised on or in an organic carrier
- C12N11/08—Enzymes or microbial cells immobilised on or in an organic carrier the carrier being a synthetic polymer
- C12N11/089—Enzymes or microbial cells immobilised on or in an organic carrier the carrier being a synthetic polymer obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- C12N11/093—Polyurethanes
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- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
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- C12N11/00—Carrier-bound or immobilised enzymes; Carrier-bound or immobilised microbial cells; Preparation thereof
- C12N11/02—Enzymes or microbial cells immobilised on or in an organic carrier
- C12N11/10—Enzymes or microbial cells immobilised on or in an organic carrier the carrier being a carbohydrate
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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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/24—Treatment of water, waste water, or sewage by flotation
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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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/40—Devices for separating or removing fatty or oily substances or similar floating material
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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
- 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
- C02F1/5281—Installations for water purification using chemical agents
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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
- 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
- C02F1/54—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using organic material
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- 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
- C02F1/54—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using organic material
- C02F1/56—Macromolecular compounds
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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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
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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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/76—Treatment of water, waste water, or sewage by oxidation with halogens or compounds of halogens
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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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F2001/007—Processes including a sedimentation step
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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
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/06—Contaminated groundwater or leachate
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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
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/06—Controlling or monitoring parameters in water treatment pH
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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
- C02F2303/00—Specific treatment goals
- C02F2303/04—Disinfection
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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
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/02—Aerobic processes
- C02F3/12—Activated sludge processes
- C02F3/1236—Particular type of activated sludge installations
- C02F3/1268—Membrane bioreactor systems
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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
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/28—Anaerobic digestion processes
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/28—Anaerobic digestion processes
- C02F3/2846—Anaerobic digestion processes using upflow anaerobic sludge blanket [UASB] reactors
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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
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/28—Anaerobic digestion processes
- C02F3/2853—Anaerobic digestion processes using anaerobic membrane bioreactors
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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
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/30—Aerobic and anaerobic processes
Abstract
The invention discloses a kitchen waste treatment method, which comprises the following steps: the kitchen waste is sorted and crushed, the microbial fermentation decomposition, the oil-water separation, the aeration air flotation separation, the hydrolysis-anaerobic fermentation, the A/O pool, the hydrolysis-MBR and the disinfection treatment are carried out, so that the quality of the effluent water reaches the discharge or reuse standard, the whole treatment process is carried out at normal temperature without high-temperature drying, the defects that the kitchen waste treatment in the prior art needs high-temperature treatment, the energy consumption is high and the reduction rate is low are overcome, the kitchen waste treatment under the normal-temperature aerobic environment is realized, the energy consumption is low, the reduction rate is up to 99%, the final products of organic matter decomposition are carbon dioxide and water, no secondary pollutant is generated, the environmental pollution is reduced, and the comprehensive treatment capability of the kitchen waste treatment environment is greatly improved.
Description
Technical Field
The invention belongs to the technical field of kitchen waste treatment, and particularly relates to a kitchen waste treatment method.
Background
With the rapid development of economy in China, the living standard of people is gradually improved, various catering service industries are gradually increased, and kitchen waste is gradually increased. The kitchen waste refers to kitchen waste and food waste generated by restaurants, hotels, various restaurants, public dining halls such as government offices, enterprises and public institutions and schools and the like, and is an organic waste part in municipal domestic waste. Kitchen waste can deteriorate through stacking, not only gives off foul smell, and causes polluted environments such as waste water, waste oil and the like, and after the kitchen waste is humus and deteriorated, a large amount of harmful substances including various bacteria harmful to human bodies and animals can be generated, and the kitchen waste becomes a headache urban public nuisance.
The kitchen waste is characterized in that: the water content is high, the organic matter content is high, the oil content is far higher than that of other organic wastes, and the kitchen waste has the characteristics of high fat and high organic matter, so that the kitchen waste has higher recycling value, wherein the main components of the organic matter are starch, dietary fiber, animal fat and protein, which are rich resources for preparing organic fertilizer or feed. Therefore, the kitchen waste is scientifically treated to prepare the organic fertilizer or the high-protein feed, so that the environmental pollution is solved, the biological chain for transferring harmful substances to a human body is cut off, meanwhile, the output can be used as valuable production data of agriculture and animal husbandry, and the circular economy is developed while the environmental pollution is solved.
The traditional kitchen waste treatment method has obvious defects, such as waste of available resources caused by sanitary landfill treatment of polluted soil and underground water; in the incineration treatment, because the water content of the perishable garbage is high, air pollution such as dioxin and the like is easily generated in the incineration; the high-temperature composting treatment has huge electric energy consumption, and the salt-containing oil content of the product is too high, so that the resource is difficult; the investment of the biogas power generation treatment project is large, and the stable operation is difficult. Therefore, the development of a kitchen waste treatment method with low energy consumption and high reduction rate is urgent.
Disclosure of Invention
Technical purpose
The invention aims to overcome the defects of the prior art and provides a kitchen waste treatment method which is simple in process, energy-saving, environment-friendly, stable in treatment effect and high in reduction rate.
(II) technical scheme
In order to achieve the technical purpose, the invention adopts the following technical scheme.
The application of arbutin modified activated carbon in kitchen waste treatment is characterized in that arbutin modified activated carbon is mixed with sodium palmitate to serve as a coagulant aid and is used in an aeration air flotation separation process of kitchen waste treatment, and the grafting rate of the arbutin modified activated carbon is 14-20%.
The arbutin modified activated carbon is prepared by the following method:
s1, ultrasonically dispersing activated carbon in deionized water, adding an oxidant, stirring and reacting for 6-10 hours, washing a reaction product with deionized water and ethanol in sequence, and drying to obtain carboxylated activated carbon;
s2, adding carboxylated activated carbon and thionyl chloride into N, N-dimethylformamide under the protection of nitrogen, ultrasonically dispersing uniformly, stirring and reacting for 20-30 h at 70-90 ℃, and drying a reaction product in vacuum for later use;
s3, re-dispersing the product obtained in the step S2 in N, N-dimethylformamide, adding arbutin after uniform ultrasonic dispersion, stirring and reacting for 16-24 hours at 70-90 ℃, centrifugally separating the reaction product, washing with water, and drying to obtain arbutin modified activated carbon.
Further, the step S1 of preparing arbutin modified activated carbon includes the following limitations:
1) the oxidant is 5-7 mol/L nitric acid solution, and the addition amount of the oxidant is 8-18 times of the mass of the activated carbon;
2) the ultrasonic frequency is 20-25 kHz, and the power density is 0.3-0.35W/cm2；
3) The stirring speed is 180-400 r/min;
4) the drying temperature is 100-120 ℃.
Further, the step S2 of preparing arbutin modified activated carbon includes the following limitations:
1) the addition weight ratio of the carboxylated activated carbon to the thionyl chloride to the N, N-dimethylformamide is 1: 20-50: 5-20;
2) the ultrasonic frequency is 20-30 kHz, and the power density is 0.3-0.35W/cm2；
3) The stirring speed is 200-600 r/min.
Further, the step S3 of preparing arbutin modified activated carbon includes the following limitations:
1) the adding mass ratio of arbutin to N, N-dimethylformamide is 1: 8-20;
2) the ultrasonic frequency is 20-30 kHz, and the power density is 0.3-0.35W/cm2；
3) The stirring speed is 80-200 r/min;
4) the drying temperature is 60-80 ℃.
The invention takes arbutin modified active carbon and sodium palmitate as coagulant aids andthe polyacrylamide is mixed to be used as a flocculating agent for the aeration air-flotation separation process, can effectively adsorb, flocculate and settle some suspended particles and organic matters in water through adsorption, complexation, ion exchange and flocculation and settling effects to achieve the separation effect, and the flocculating aid and the polyacrylamide are compounded for use, thereby being beneficial to the pollutants to enter flocs to enhance the adsorption and flocculation effects, improving the flocculation speed and obtaining excellent treatment effect, and the flocculating agent does not contain Cl-、SO4 2-The plasma can not corrode the pipeline facilities and has no pollution.
A kitchen waste treatment method comprises the following steps:
step one, sorting and crushing: primarily sorting the kitchen waste, transferring the sorted large foreign matters to be burned or buried, and crushing the residual matters;
step two, microbial fermentation and decomposition: adding polyurethane filler and a composite microbial degradation microbial inoculum into the kitchen waste, stirring and fermenting, separating out large-diameter impurities, transferring and burning or burying;
step three, oil-water separation: conveying the landfill leachate generated by microbial fermentation and decomposition to an oil-water separation system for separation, and recycling the separated oil phase;
step four, aeration air flotation separation: performing air floatation separation on the percolate obtained by oil-water separation by using an air floatation machine, adding a flocculating agent in the separation process, improving the air floatation separation rate, and separating sludge and scum to perform composting treatment;
step five, hydrolysis-anaerobic fermentation: fully hydrolyzing percolate separated by aeration floatation in a hydrolysis tank, adding a filler into the hydrolysis tank, adjusting the hydrolysis temperature to 20-30 ℃, adjusting the pH of wastewater generated by hydrolysis to 6.8-7.4 by using sodium carbonate, then feeding the wastewater into a UASB (anaerobic reactor) for anaerobic fermentation, and collecting generated waste gas;
step six, an A/O pool: the leachate after anaerobic fermentation treatment enters an A/O (anaerobic/O) pool, the concentration of activated sludge in the A/O pool is controlled to be 5000-6500 mg/L, a phosphorus removal agent is added into an aerobic pool, and the leachate is fully subjected to organic matter removal and nitrogen removal in the A/O pool;
step seven, hydrolysis-MBR: fully hydrolyzing the leachate treated by the A/O tank in a hydrolysis tank, adding a filler into the hydrolysis tank, adjusting the hydrolysis temperature to 20-30 ℃, adjusting the pH of wastewater generated by hydrolysis to 6.8-7.8 by using sodium carbonate, lifting the hydrolyzed leachate into an MBR (membrane bioreactor) by using a lifting pump, separating by using a polytetrafluoroethylene membrane (the average pore diameter is less than 0.1 mu m), and refluxing the separated activated sludge to an anaerobic tank of the A/O tank;
step eight, disinfection treatment: disinfecting and recycling or discharging percolate obtained by MBR sewage treatment by using sodium hypochlorite; wherein the content of the first and second substances,
in the aeration air flotation separation process of the fourth step, the flocculating agent is a mixture of polyacrylamide and a coagulant aid in a mass ratio of 1: 14-20;
the coagulant aid comprises: the arbutin modified activated carbon and the sodium palmitate are in a mass ratio of 1: 0.2-0.4.
The kitchen waste treatment method provided by the invention is mainly used for producing water based on the microorganism phase change principle, then the wastewater treatment is completed by a subsequent wastewater treatment combined process, and the method sequentially comprises the steps of sorting and crushing kitchen waste, fermenting and decomposing microorganism, separating oil from water, aerating and air-floating separation, hydrolyzing-anaerobic fermentation, an A/O (anoxic/oxic) pool, hydrolyzing-MBR (membrane bioreactor) and sterilizing treatment, so that the quality of effluent water reaches the discharge or reuse standard, the whole treatment process is carried out at normal temperature without high-temperature drying, the defects of high-temperature treatment, high energy consumption and low reduction rate in the kitchen waste treatment in the prior art are overcome, the kitchen waste treatment under the normal-temperature aerobic environment is realized, the energy consumption is low, the reduction rate is as high as 99 percent, and the final products of the decomposition of the organic matters are carbon dioxide and water, no secondary pollutants are generated, the environmental pollution is reduced, and the comprehensive treatment capability of the kitchen waste treatment environment is greatly improved.
In some embodiments, a step of the kitchen waste treatment method comprises the following definition:
1) the large foreign matters sorted out comprise plastic, stone, ceramic, metal, paper, chemical fiber cloth, rubber and the like which cannot be degraded;
2) the remaining material was crushed to a size of 2mm or less.
In some embodiments, the step two of the kitchen waste treatment method comprises the following definitions:
1) the composite microbial degradation microbial inoculum comprises a composite microorganism and a solid auxiliary material in a mass ratio of 1: 3.8-4.2; wherein the content of the first and second substances,
the composite microorganism comprises: 24-30 parts of bacillus subtilis subspecies subtilis, 4-10 parts of halotolerant bacillus, 16-24 parts of bacillus amyloliquefaciens, 2-6 parts of bacillus sonolatus, 2-8 parts of bacillus cereus, 8-16 parts of bacillus mycoides, 4-10 parts of pseudomonas herbaceum and 8-16 parts of pseudomonas proteoliticus, wherein the viable count of each strain is 1-3 multiplied by 108cfu/mL；
The solid auxiliary materials comprise: peptone and cellulose in a mass ratio of 1: 1-1.2;
2) the stirring speed is 80-200 r/min;
3) the temperature is 25-40 ℃, and the humidity is 80-90%.
In some embodiments, in the fourth step of the kitchen waste treatment method, the flocculating agent is a mixture of polyacrylamide and a coagulant aid in a mass ratio of 1: 14-20;
in some embodiments, in step four of the kitchen waste treatment method, the flocculant is prepared by the following method:
the raw materials are mixed and added into deionized water with the weight being 3-5 times of that of the raw materials according to the proportion, the temperature is raised to 60-80 ℃, the mixture is stirred and heated under the speed of 200-400 r/min to be uniformly mixed, the mixture is naturally cooled to the room temperature and is placed for 2-6 hours, then the temperature is raised to 85-100 ℃, the mixture is fully stirred until the water content of the mixture is lower than 5%, and the flocculant is obtained after natural cooling.
In some embodiments, in the fifth step and the seventh step of the kitchen waste treatment method, the fillers in the hydrolysis process are all modified polyurethane fillers, the volume filling rate of the modified polyurethane fillers in the fifth step is 20-35%, and the volume filling rate of the modified polyurethane fillers in the seventh step is 10-20%.
Further, the modified polyurethane filler is prepared by the following method:
s1, uniformly mixing polyester polyol and polyethylene glycol to obtain a polyol mixed solution, adding water, triethylamine, dibutyl olefin dilaurate and silicone oil into the polyol mixed solution, and stirring at 60-80 ℃ to fully and uniformly mix to obtain a mixed solution I;
s2, standing the mixed solution I to remove bubbles, adding lysine triisocyanate, stirring to uniformly mix to obtain a mixed solution II, and curing for more than 8 hours to obtain polyurethane foam;
s3, mixing 1-4% by mass of polyethylene glycol solution and 3-5% by mass of sodium alginate solution according to a volume ratio of 1: 4-6 to obtain mixed solution III, placing polyurethane foam in the mixed solution III, extruding the polyurethane foam to absorb the mixed solution, taking out the polyurethane foam, soaking the polyurethane foam in 2-4% of calcium chloride solution, stirring to perform cross-linking molding, washing with water, and drying at room temperature to obtain the modified polyurethane filler.
Furthermore, in the step S1 of preparing the modified polyurethane filler, the mass ratio of the polyester polyol, the polyethylene glycol, the water, the triethylamine, the dibutylene dilaurate and the silicone oil is 10: 6-8: 0.4-0.6: 0.1-0.2: 0.05-0.1: 0.2-0.3.
Furthermore, in the step S1 of preparing the modified polyurethane filler, the stirring speed is 600-800 r/min.
Furthermore, in the step S2 of preparing the modified polyurethane filler, the addition amount of lysine triisocyanate is 1.2-1.5 times of the mass of the polyester polyol.
Furthermore, in the step S2 of preparing the modified polyurethane filler, the curing temperature is 70-80 ℃.
Furthermore, in the step S2 of preparing the modified polyurethane filler, the stirring speed is 200-400 r/min.
Furthermore, in the step S3 of preparing the modified polyurethane filler, the stirring speed is 60-80 r/min.
According to the invention, lysine triisocyanate, polyester polyol and polyethylene glycol are used as raw materials to prepare polyurethane foam, and the polyurethane foam is modified by polyethylene glycol and sodium alginate to prepare the modified polyurethane filler with large specific surface area, good hydrophilicity, strong biocompatibility and biological adhesion.
In some embodiments, in step six of the kitchen waste treatment method, the a/O process comprises the following definitions:
1) an anoxic tank: the temperature is 20-40 ℃, the pH value is 6.8-7.4, and the retention time is 16-20 h; an aerobic tank: the temperature is 15-30 ℃, the PH value is 6.5-7.5, and the retention time is 10-30 h;
2) adding a phosphorus removing agent into the aerobic tank, comprising the following steps: 30-65% of polyaluminium sulfate, 20-50% of polyferric sulfate, 0.1-5% of calcium sulfate, 0.1-3% of magnesium oxide and 0.1-2% of citric acid.
In some embodiments, in the MBR process of the seventh step, a blast aeration mode is adopted, the retention time is 8-16 h, the reflux ratio is 100-200%, and the aeration amount is 10-14 mL/min.
By adopting the kitchen waste treatment method, water is produced based on the microbial phase change principle, and then the wastewater treatment is completed through a subsequent wastewater treatment combined process, which sequentially comprises the steps of sorting and crushing kitchen waste, performing microbial fermentation decomposition, performing oil-water separation, performing aeration air flotation separation, performing hydrolysis-anaerobic fermentation, performing A/O (anaerobic/anoxic/oxic) tank, performing hydrolysis-MBR (membrane bioreactor) and performing disinfection treatment so as to achieve the functions of reducing the waste, enabling the wastewater to reach the discharge or reuse standard and protecting the environment.
(III) advantageous effects
Compared with the prior art, the invention has the beneficial effects that:
1) the microbial degradation microbial inoculum provided by the invention is used for carrying out degradation fermentation treatment on the kitchen waste, so that the defects of high-temperature treatment, high energy consumption and low reduction rate in the kitchen waste treatment in the prior art are overcome, the kitchen waste is treated in a normal-temperature aerobic environment, the energy consumption is low, the reduction rate is high, the final products of aerobic decomposition of organic matters are carbon dioxide and water, no secondary pollutant is generated, the environmental pollution is reduced, and the comprehensive treatment capacity of the kitchen waste treatment environment is greatly improved;
2) according to the invention, lysine triisocyanate, polyester polyol and polyethylene glycol are used as raw materials to prepare polyurethane foam, and the polyurethane foam is modified by polyethylene glycol and sodium alginate to prepare the modified polyurethane filler with large specific surface area, good hydrophilicity, strong biocompatibility and biological adhesion, and the existence of lysine triisocyanate in polyurethane can promote the crosslinking molding of polyethylene glycol and sodium alginate on the surface of polyurethane foam, improve the hydrophilicity of polyurethane filler, provide a proper growth environment for hydrolytic acidification bacteria, can load higher biological strains, ensure the complete degradation of organic matters in wastewater, improve the purification efficiency and improve the garbage reduction rate;
3) the arbutin modified activated carbon and sodium palmitate are used as the coagulant aid and mixed with polyacrylamide to be used as the flocculant, the flocculant is used in the air flotation separation process, can effectively adsorb, flocculate and settle some suspended particles and organic matters in water through adsorption, complexation, ion exchange and flocculation and sedimentation effects to achieve the separation effect, the coagulant aid and the polyacrylamide are compounded for use, so that pollutants can enter flocs to enhance the adsorption and flocculation effects, an excellent coagulation treatment effect is obtained, the purification efficiency and the reduction rate are improved, and the flocculant does not contain Cl-、SO4 2-The plasma can not corrode the pipeline facilities and has no pollution.
Drawings
In order to make the aforementioned and other objects, features, and advantages of the invention, as well as others which will become apparent, reference is made to the following description taken in conjunction with the accompanying drawings in which:
FIG. 1 is a flow chart of a kitchen waste treatment method according to embodiment 1 of the present invention;
FIG. 2 is a schematic FTIR chart of arbutin-modified activated carbon according to example 1 of the present invention; a represents activated carbon, b represents arbutin modified activated carbon;
FIG. 3 is a schematic view showing the results of the test of the treatment effect (COD removal rate) of the kitchen waste treatment method of the present invention
FIG. 4 is a schematic view showing the results of a test of treatment effect of the kitchen waste treatment method of the present invention; b represents ammonia nitrogen removal, and C represents total phosphorus removal.
Detailed Description
To enable those skilled in the art to understand the features and effects of the present invention, the general description and definitions of the terms and words used in the specification and claims are set forth below. Unless defined otherwise, technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs, and in case of conflict, the definitions in this specification shall control.
In the invention, each microbial inoculum in the composite microbial degradation microbial inoculum is purchased from Shanghai-research Biotechnology Limited company, and the composite microbial degradation microbial inoculum comprises:
a compound microorganism: 3X 10826 parts of cfu/mL bacillus subtilis subspecies by weight and 1 multiplied by 1088 parts by weight of cfu/mL halotolerant bacillus, 3X 10822 parts of cfu/mL bacillus amyloliquefaciens and 1 multiplied by 1088 parts of cfu/mL bacillus cereus and 3 multiplied by 10814 parts by weight of cfu/mL Bacillus mycoides, 1X 108cfu/mL Pseudomonas aeruginosa 8 parts by weight, 1X 10814 parts by weight of dissolved pseudomonas protein cfu/mL;
the solid auxiliary materials comprise: 200 parts of peptone and 200 parts of arbutin;
1) respectively activating Bacillus subtilis subspecies, Bacillus amyloliquefaciens and Bacillus mycoides, and culturing to bacterial concentration of 3 × 108cfu/mL to obtain Bacillus subtilis subspecies liquid, Bacillus amyloliquefaciens liquid and Bacillus mycoides activated liquid; respectively activating halotolerant bacillus, Bacillus cereus, Pseudomonas herbacea and Pseudomonas proteoliticus, and enlarging culturing until the bacteria concentration reaches 1 × 108cfu/mL to obtain halotolerant bacillus liquid, bacillus cereus liquid, pseudomonas herbaceous liquid and pseudomonas proteoliticum liquid;
2) mixing bacillus subtilis subspecies subtilis solution, bacillus amyloliquefaciens solution and bacillus mycoides activated solution according to a proportion to prepare composite microbial solution, halotolerant bacillus solution, bacillus cereus solution, pseudomonas herbaceum solution and pseudomonas proteoliticum solution, and mixing the composite microbial solution according to a proportion;
3) and uniformly mixing the compound microbial bacteria liquid and solid auxiliary materials according to the proportion of 1:4 to obtain the compound microbial degradation microbial inoculum.
The following describes the technical solution of the present invention in further detail with reference to the detailed description and the accompanying drawings.
Example 1: a kitchen waste treatment method comprises the following steps:
the embodiment provides a kitchen waste treatment method, a flow chart of which is shown in fig. 1, and the method specifically comprises the following steps:
step one, sorting and crushing: primarily sorting the kitchen waste, transferring the sorted large foreign matters to be burned or buried, and crushing the residual matters;
step two, microbial fermentation and decomposition: adding polyurethane filler and a composite microbial degradation microbial inoculum into the kitchen waste, stirring and fermenting, separating out large-diameter impurities, transferring and burning or burying;
step three, oil-water separation: conveying the landfill leachate generated by microbial fermentation and decomposition to an oil-water separation system for separation, and recycling the separated oil phase;
step four, aeration air flotation separation: performing air floatation separation on the percolate obtained by oil-water separation by using an air floatation machine, adding a flocculating agent in the separation process, improving the air floatation separation rate, and separating sludge and scum to perform composting treatment;
the flocculant comprises: polyacrylamide, arbutin modified activated carbon and sodium palmitate in a weight ratio of 1:15: 3;
the flocculant is prepared by the following method:
ultrasonically dispersing 10g of activated carbon into deionized water, adding 100g of nitric acid solution of 5mol/L, stirring and reacting for 10 hours at 200r/min, washing a reaction product by using deionized water and ethanol in sequence, and drying at 100 ℃ to obtain carboxylated activated carbon; under the protection of nitrogen, adding carboxylated activated carbon and 400g of thionyl chloride into 100g of N, N-dimethylformamide, ultrasonically dispersing uniformly, stirring at 80 ℃ for reacting for 24 hours, and drying the reaction product in vacuum; then redispersed in 100gAdding 2g arbutin into N, N-dimethylformamide after ultrasonic dispersion, stirring at 80 deg.C for 20h, centrifuging reaction product, washing with water, and drying at 60 deg.C to obtain arbutin modified activated carbon, wherein FTIR chart is shown in FIG. 2, compared with curve a (unmodified activated carbon) and curve b (modified activated carbon) at 1518cm-1、1072cm-1、1036cm-1A new characteristic peak appears, which belongs to the characteristic peak of arbutin, and indicates that arbutin modified activated carbon is generated; mixing the raw materials, adding the mixture into 90g of deionized water, heating to 70 ℃ at the speed of 3 ℃/min, stirring at the speed of 400r/min to fully and uniformly mix the raw materials, naturally cooling to room temperature, and standing for 6 hours; then heating to 90 ℃ at the speed of 8 ℃/min, fully stirring until the water content of the mixture is lower than 5%, and naturally cooling to obtain a flocculating agent;
step five, hydrolysis-anaerobic fermentation: fully hydrolyzing percolate separated by aeration floatation in a hydrolysis tank, adding filler into the hydrolysis tank, adjusting the volume filling rate to 30 percent and the hydrolysis temperature to 30 ℃, adjusting the pH of wastewater generated by hydrolysis to 7.2 by using sodium carbonate, then feeding the wastewater into a UASB anaerobic reactor for anaerobic fermentation, and collecting generated waste gas;
the filler is modified polyurethane filler and is prepared by the following method:
uniformly mixing 100g of polyester polyol and 70g of polyethylene glycol to obtain a polyol mixed solution, adding 5g of water, 1.5g of triethylamine, 0.8g of dibutyl ene dilaurate and 3g of silicone oil into the polyol mixed solution, and stirring at 70 ℃ and 600r/min to fully and uniformly mix to obtain a mixed solution I; standing the mixed solution I to remove bubbles, adding 140g of lysine triisocyanate, stirring and uniformly mixing at 200r/min to obtain a mixed solution II, and curing at 80 ℃ for 14 hours to obtain polyurethane foam; mixing a polyethylene glycol solution with the mass fraction of 2% and a sodium alginate solution with the mass fraction of 4% according to the volume ratio of 1:5 to obtain a mixed solution III, placing polyurethane foam in the mixed solution III, extruding the polyurethane foam to enable the polyurethane foam to absorb the mixed solution, taking out the polyurethane foam, soaking the polyurethane foam in a calcium chloride solution with the mass fraction of 4%, stirring the polyurethane foam at a speed of 80r/min to enable the polyurethane foam to be crosslinked and molded, washing the polyurethane foam with water, and drying the polyurethane foam at room temperature to obtain the modified polyurethane filler;
step six, an A/O pool: the leachate after anaerobic fermentation treatment enters an A/O pool, the concentration of activated sludge in the AO pool is controlled at 5000mg/L, a phosphorus removing agent is added into an aerobic pool, and the leachate fully removes organic matters and denitrifies nitrogen in the A/O pool;
in the process of the A/O,
an anoxic tank: the temperature is 35 ℃, the pH value is 7.2, and the retention time is 20 h;
an aerobic tank: the temperature is 25 ℃, the pH value is 6.8, and the retention time is 30 h;
the phosphorus removing agent comprises: 60% of polyaluminium sulfate, 34% of polyferric sulfate, 3.5% of calcium sulfate, 1.5% of magnesium oxide and 1% of citric acid;
step seven, hydrolysis-MBR sewage treatment: fully hydrolyzing the leachate treated by the A/O tank in a hydrolysis tank, adding a filler into the hydrolysis tank, wherein the volume filling rate is 15%, lifting the hydrolyzed leachate into an MBR (membrane bioreactor) system by a lift pump, improving enough oxygen and energy for biological nitrogen and phosphorus removal by adopting a blast aeration mode, keeping the time for 14h, controlling the reflux ratio to be 150% and the aeration amount to be 12mL/min, separating by utilizing a polytetrafluoroethylene membrane (the average pore diameter is 0.1 mu m), and refluxing the separated activated sludge to an anaerobic tank of the A/O tank;
step eight, disinfection treatment: and (3) disinfecting, recycling or discharging percolate obtained by MBR sewage treatment by utilizing sodium hypochlorite.
Example 2: the other kitchen waste treatment method comprises the following steps:
the embodiment provides another kitchen waste treatment method, which basically comprises the same steps as embodiment 1, except that in the embodiment, in the aeration air flotation separation process, a flocculating agent comprises the following components: polyacrylamide, active carbon and sodium palmitate in a weight ratio of 1:15: 3; namely, the active carbon is used for replacing arbutin modified active carbon;
the flocculant is prepared by the following method:
mixing polyacrylamide, activated carbon and sodium palmitate, adding the mixture into 90g of deionized water, heating to 70 ℃ at the speed of 3 ℃/min, stirring at the speed of 400r/min to fully and uniformly mix the materials, naturally cooling to room temperature, and standing for 6 hours; then raising the temperature to 90 ℃ at the speed of 8 ℃/min, fully stirring until the water content of the mixture is lower than 5%, and naturally cooling to obtain the flocculant.
Example 3: the other kitchen waste treatment method comprises the following steps:
the embodiment provides another kitchen waste treatment method, which basically comprises the same steps as embodiment 1, except that in the embodiment, the addition amounts of the active carbon and arbutin in the preparation process of arbutin modified active carbon in the flocculant in the aeration air flotation separation process are respectively 10g and 1.55 g.
Example 4: the other kitchen waste treatment method comprises the following steps:
the embodiment provides another kitchen waste treatment method, which basically comprises the same steps as embodiment 1, except that in the embodiment, the addition amounts of the active carbon and arbutin in the preparation process of arbutin modified active carbon in the flocculant in the aeration air flotation separation process are respectively 10g and 2.4 g.
Example 5: the other kitchen waste treatment method comprises the following steps:
the embodiment provides another kitchen waste treatment method, which basically comprises the same steps as embodiment 1, except that in the embodiment, the addition amounts of the active carbon and arbutin in the preparation process of arbutin modified active carbon in the flocculant in the aeration air flotation separation process are respectively 10g and 3 g.
Example 6: the other kitchen waste treatment method comprises the following steps:
the embodiment provides another kitchen waste treatment method, which basically comprises the same steps as embodiment 1, except that in the embodiment, in the aeration air flotation separation process, a flocculating agent comprises the following components: polyacrylamide and active carbon in a weight ratio of 1: 18; i.e. no sodium palmitate was added.
Example 7: the other kitchen waste treatment method comprises the following steps:
the embodiment provides another kitchen waste treatment method, which basically comprises the same steps as embodiment 1, except that in the embodiment, in the aeration air flotation separation process, a flocculating agent comprises the following components: polyacrylamide and sodium palmitate in a weight ratio of 1: 18; namely arbutin modified activated carbon is not added;
the flocculant is prepared by the following method:
mixing polyacrylamide and sodium palmitate, adding the mixture into 90g of deionized water, heating to 70 ℃ at the speed of 3 ℃/min, stirring at the speed of 400r/min to fully and uniformly mix the materials, naturally cooling to room temperature and standing for 6 hours; then raising the temperature to 90 ℃ at the speed of 8 ℃/min, fully stirring until the water content of the mixture is lower than 5%, and naturally cooling to obtain the flocculant.
Example 8: the other kitchen waste treatment method comprises the following steps:
the embodiment provides another kitchen waste treatment method, which basically comprises the same steps as embodiment 1, except that in the embodiment, a flocculating agent is only polyacrylamide in the aeration air flotation separation process;
adding polyacrylamide into 90g of deionized water, heating to 70 ℃ at the speed of 3 ℃/min, stirring at the speed of 400r/min to fully and uniformly mix, naturally cooling to room temperature, and standing for 6 hours; then raising the temperature to 90 ℃ at the speed of 8 ℃/min, fully stirring until the water content of the mixture is lower than 5%, and naturally cooling to obtain the flocculant.
Example 9: the other kitchen waste treatment method comprises the following steps:
this example provides another kitchen waste treatment method, which has substantially the same steps as example 1, except that in this example, the filler in the hydrolysis process is a commercially available polyurethane foam material.
Example 10: the other kitchen waste treatment method comprises the following steps:
this example provides another kitchen waste treatment method, which has substantially the same steps as example 1, except that in this example, the hydrolysis-MBR process is replaced by a secondary sedimentation tank process.
Experimental example 1:
the grafting ratio was measured using arbutin-modified activated carbon prepared in examples 1, 3 to 5 as a test object, and the grafting ratio (GD/%) was calculated by the following formula (1),
in the formula (1), m1-the mass of arbutin grafted activated carbon; m is0Quality of the non-arbutin grafted activated carbon.
Tests show that the grafting rates of the arbutin modified activated carbon prepared in the embodiments 1 and 3-5 are respectively 18.2%, 14.2%, 19.8% and 22.4%, and the grafting rates of the arbutin modified activated carbon provided in the embodiments 1, 3 and 4 are in accordance with the requirements of the invention.
Experimental example 2:
the flocculating agent provided by the embodiment 1-8 is used as an experimental object for carrying out flocculation efficiency test, and the test method comprises the following steps: taking sewage obtained after oil-water separation of the kitchen waste as raw water, wherein the turbidity of the raw water is 800NTU, and the turbidity test is carried out according to GB13200-1991 determination of water turbidity, adding a flocculating agent into the raw water (stirring for 5min), calculating the consumption of the flocculating agent required when the turbidity of a water sample is reduced to 1NTU, and recording natural settling time (from stopping stirring to stable settling), wherein the test results are shown in Table 1.
Table 1 flocculation efficiency test
| Examples | Dosage of flocculant (mg/L raw water) | Settling time(s) |
| 1 | 32 | 128 |
| 2 | 42 | 324 |
| 3 | 34 | 168 |
| 4 | 32 | 141 |
| 5 | 37 | 288 |
| 6 | 42 | 386 |
| 7 | 44 | 427 |
| 8 | 46 | 568 |
As shown in Table 1, the arbutin modified activated carbon and sodium palmitate are used as coagulant aids and are mixed with polyacrylamide to be used as a flocculant, so that the flocculation efficiency is high, and the treatment effect is quick; as can be seen from the comparison of examples 1-5, compared with activated carbon, the activated carbon modified by arbutin grafting is more beneficial to improving the flocculation efficiency of the flocculant; as can be seen from comparison of examples 6 and 7, the arbutin modified activated carbon and sodium palmitate have a synergistic effect, and the flocculation efficiency of the flocculant can be greatly improved by mixing the arbutin modified activated carbon and the sodium palmitate, so that the treatment efficiency is improved.
Experimental example 3:
the kitchen waste is treated by the kitchen waste treatment method provided by the embodiment 1-10, after 7d operation, the water quality of the discharged water for 24h is tested, and the test results are shown in table 2 and fig. 3 and 4.
TABLE 2 Water quality test of discharged Water
Table 2 shows the contents of suspended matters, COD, ammonia nitrogen and total phosphorus in the discharged water after the kitchen waste is treated for 24 hours by using the kitchen waste treatment method provided by the invention, wherein the content of the suspended matters in the waste after oil-water separation is 300mg/L, COD and is 633mg/L, the content of the ammonia nitrogen is 18.2mg/L and the content of the total phosphorus is 3.8 mg/L; as shown in table 2, in the discharged water obtained by the kitchen waste treatment method according to preferred embodiment 1 of the present invention, the content of suspended matter is 0.64mg/L, the COD content is 22.8mg/L, the ammonia nitrogen content is 1.24mg/L, and the total phosphorus content is 0.32mg/L, which meets the surface V-type water discharge standard specified in surface water environmental quality standard GB 3838-2002; it can be seen from comparative examples 1-5 that, compare unmodified active carbon, the active carbon after arbutin grafting is more favorable to improving the treatment effect, and effluent quality of water is more excellent, and comparative examples 6, 7 can see that sodium palmitate, arbutin modified active carbon, use with polyacrylamide complex has the synergism, are favorable to the pollutant to get into the floc and strengthen the adsorption flocculation effect, improve effluent quality of water by a wide margin.
Fig. 3 and 4 respectively show the COD removal rate and the ammonia nitrogen and total phosphorus removal rate after the kitchen waste is treated for 24 hours by using the kitchen waste treatment method provided by the invention, specifically, the reuse or discharge of sewage in the step eight is relative to the leachate before the air flotation separation in the step four; as shown in fig. 3 and 4, in preferred embodiment 1, the removal rate of COD is 96.4%, the removal rate of ammonia nitrogen is 93.2%, the removal rate of total phosphorus is 91.5%, and the removal efficiency of COD, ammonia nitrogen and total phosphorus is high, and it can be seen that both the grafting rate of arbutin modified activated carbon in the flocculant in the aeration air-flotation separation process, the composition of the flocculant, and the filler in the hydrolysis process have significant influence on the removal of COD, ammonia nitrogen and total phosphorus, which indicates that arbutin modified activated carbon and modified polyurethane provided by the present invention are beneficial to the improvement of the removal rates of COD, ammonia nitrogen and total phosphorus.
Conventional operations in the operation steps of the present invention are well known to those skilled in the art and will not be described herein. The embodiments described above are intended to illustrate the technical solutions of the present invention in detail, and it should be understood that the above-mentioned embodiments are only specific embodiments of the present invention, and are not intended to limit the present invention, and any modification, supplement or similar substitution made within the scope of the principles of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. The application of arbutin modified activated carbon in kitchen waste treatment is characterized in that arbutin modified activated carbon is mixed with sodium palmitate as a coagulant aid and used in an aeration air flotation separation process of kitchen waste treatment, and the grafting rate of the arbutin modified activated carbon is 14-20%;
the preparation method of the arbutin modified activated carbon comprises the following steps:
s1, ultrasonically dispersing activated carbon in deionized water, adding an oxidant, stirring and reacting for 6-10 hours, washing a reaction product with deionized water and ethanol in sequence, and drying to obtain carboxylated activated carbon;
s2, adding carboxylated activated carbon and thionyl chloride into N, N-dimethylformamide under the protection of nitrogen, ultrasonically dispersing uniformly, stirring and reacting for 20-30 h at 70-90 ℃, and drying a reaction product in vacuum for later use;
s3, re-dispersing the product obtained in the step S2 in N, N-dimethylformamide, adding arbutin after uniform ultrasonic dispersion, stirring and reacting for 16-24 hours at 70-90 ℃, centrifugally separating the reaction product, washing with water, and drying to obtain arbutin modified activated carbon.
2. A kitchen waste treatment method is characterized by comprising the following steps:
sorting and crushing kitchen waste, adding a polyurethane filler and a compound microbial agent for fermentation treatment, performing oil-water separation on generated leachate, adding a flocculant into a water phase for aeration air-flotation separation, adding the filler into the leachate obtained by aeration air-flotation separation for sufficient hydrolysis, then performing anaerobic fermentation, feeding the leachate obtained by fermentation treatment into an A/O (anoxic/oxic) tank for removing organic matters and denitrification, adding the filler for sufficient hydrolysis, then feeding the leachate into an MBR (membrane bioreactor) for separation, and finally performing disinfection and discharge; in the aeration air flotation separation process, a flocculating agent is a mixture of polyacrylamide and a coagulant aid in a mass ratio of 1: 14-20;
the coagulant aid comprises: the arbutin-modified activated carbon and the sodium palmitate as defined in claim 1, wherein the mass ratio of the arbutin-modified activated carbon to the sodium palmitate is 1: 0.2-0.4.
3. The kitchen waste treatment method according to claim 2, characterized by specifically comprising:
step one, sorting and crushing: primarily sorting the kitchen waste, transferring the sorted large foreign matters to be burned or buried, and crushing the residual matters;
step two, microbial fermentation and decomposition: adding polyurethane filler and a composite microbial degradation microbial inoculum into the kitchen waste, stirring and fermenting, separating out large-diameter impurities, transferring and burning or burying;
step three, oil-water separation: conveying the landfill leachate generated by microbial fermentation and decomposition to an oil-water separation system for separation, and recycling the separated oil phase;
step four, aeration air flotation separation: performing air floatation separation on the percolate obtained by oil-water separation by using an air floatation machine, adding a flocculating agent in the separation process, improving the air floatation separation rate, and separating sludge and scum to perform composting treatment;
step five, hydrolysis-anaerobic fermentation: fully hydrolyzing percolate separated by aeration floatation in a hydrolysis tank, adding a filler into the hydrolysis tank, adjusting the hydrolysis temperature to 20-30 ℃, adjusting the pH of wastewater generated by hydrolysis to 6.8-7.4 by using sodium carbonate, then feeding the wastewater into a UASB (anaerobic reactor) for anaerobic fermentation, and collecting generated waste gas;
step six, an A/O pool: the leachate after anaerobic fermentation treatment enters an A/O (anaerobic/O) pool, the concentration of activated sludge in the A/O pool is controlled to be 5000-6500 mg/L, a phosphorus removal agent is added into an aerobic pool, and the leachate is fully subjected to organic matter removal and nitrogen removal in the A/O pool;
step seven, hydrolysis-MBR: fully hydrolyzing the leachate treated by the A/O tank in a hydrolysis tank, adding a filler into the hydrolysis tank, adjusting the hydrolysis temperature to 20-30 ℃, adjusting the pH of wastewater generated by hydrolysis to 6.8-7.8 by using sodium carbonate, lifting the hydrolyzed leachate into an MBR (membrane bioreactor) by using a lifting pump, separating by using a polytetrafluoroethylene membrane with the average pore size of less than 0.1 mu m, and refluxing the separated activated sludge to an anaerobic tank of the A/O tank;
step eight, disinfection treatment: and (3) disinfecting, recycling or discharging percolate obtained by MBR sewage treatment by utilizing sodium hypochlorite.
4. The method according to claim 3, wherein the fillers in the hydrolysis process are all modified polyurethane fillers, the volume filling rate of the modified polyurethane fillers in the fifth step is 20-35%, and the volume filling rate of the modified polyurethane fillers in the seventh step is 10-20%.
5. The method of claim 4, wherein the modified polyurethane filler is prepared by:
s1, uniformly mixing polyester polyol and polyethylene glycol to obtain a polyol mixed solution, adding water, triethylamine, dibutyl olefin dilaurate and silicone oil into the polyol mixed solution, and stirring at 60-80 ℃ to fully and uniformly mix to obtain a mixed solution I;
s2, standing the mixed solution I to remove bubbles, adding lysine triisocyanate, stirring to uniformly mix to obtain a mixed solution II, and curing for more than 8 hours to obtain polyurethane foam;
s3, mixing 1-4% by mass of polyethylene glycol solution and 3-5% by mass of sodium alginate solution according to a volume ratio of 1: 4-6 to obtain mixed solution III, placing polyurethane foam in the mixed solution III, extruding the polyurethane foam to absorb the mixed solution, taking out the polyurethane foam, soaking the polyurethane foam in 2-4% of calcium chloride solution, stirring to perform cross-linking molding, washing with water, and drying at room temperature to obtain the modified polyurethane filler.
6. The method according to claim 5, wherein in step S1 of preparing the modified polyurethane filler, the mass ratio of the polyester polyol, the polyethylene glycol, the water, the triethylamine, the dibutylene dilaurate and the silicone oil is 10: 6-8: 0.4-0.6: 0.1-0.2: 0.05-0.1: 0.2-0.3.
7. A method according to claim 2 or 3, characterized in that, in the A/O process,
an anoxic tank: the temperature is 20-40 ℃, the pH value is 6.8-7.4, and the retention time is 16-20 h;
an aerobic tank: the temperature is 15-30 ℃, the PH is 6.5-7.5, and the retention time is 10-30 h.
8. The kitchen waste treatment method according to claim 3, wherein in the A/O process, the phosphorus removal agent comprises: 30-65% of polyaluminium sulfate, 20-50% of polyferric sulfate, 0.1-5% of calcium sulfate, 0.1-3% of magnesium oxide and 0.1-2% of citric acid.
9. The kitchen waste treatment method according to claim 2 or 3, characterized in that in the MBR separation process, a blast aeration mode is adopted, the retention time is 8-16 h, the reflux ratio is 100-200%, and the aeration rate is 10-14 mL/min.
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| CN115055483B (en) * | 2022-06-17 | 2023-05-30 | 湖南科美洁环保科技有限公司 | Kitchen waste treatment process |
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