CN112358137A - Kitchen waste and leachate synergistic treatment process - Google Patents
Kitchen waste and leachate synergistic treatment process Download PDFInfo
- Publication number
- CN112358137A CN112358137A CN202011310754.9A CN202011310754A CN112358137A CN 112358137 A CN112358137 A CN 112358137A CN 202011310754 A CN202011310754 A CN 202011310754A CN 112358137 A CN112358137 A CN 112358137A
- Authority
- CN
- China
- Prior art keywords
- treatment
- kitchen waste
- biogas slurry
- leachate
- pretreatment
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000010806 kitchen waste Substances 0.000 title claims abstract description 51
- 238000000034 method Methods 0.000 title claims abstract description 31
- 230000002195 synergetic effect Effects 0.000 title claims abstract description 18
- 239000002002 slurry Substances 0.000 claims abstract description 63
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 45
- 239000007788 liquid Substances 0.000 claims abstract description 36
- 238000001223 reverse osmosis Methods 0.000 claims abstract description 24
- 238000000855 fermentation Methods 0.000 claims abstract description 18
- 238000001728 nano-filtration Methods 0.000 claims abstract description 16
- 238000004659 sterilization and disinfection Methods 0.000 claims abstract description 16
- 238000000108 ultra-filtration Methods 0.000 claims abstract description 16
- 238000001914 filtration Methods 0.000 claims abstract description 15
- 230000015271 coagulation Effects 0.000 claims abstract description 14
- 238000005345 coagulation Methods 0.000 claims abstract description 14
- 238000004537 pulping Methods 0.000 claims abstract description 13
- 239000010865 sewage Substances 0.000 claims abstract description 11
- 238000005188 flotation Methods 0.000 claims abstract description 10
- 230000003139 buffering effect Effects 0.000 claims abstract description 5
- 230000001954 sterilising effect Effects 0.000 claims abstract description 5
- 239000000725 suspension Substances 0.000 claims abstract description 5
- 238000007781 pre-processing Methods 0.000 claims abstract description 4
- 239000012535 impurity Substances 0.000 claims description 17
- 239000010802 sludge Substances 0.000 claims description 16
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 claims description 11
- 238000011010 flushing procedure Methods 0.000 claims description 7
- 239000000654 additive Substances 0.000 claims description 2
- 239000008394 flocculating agent Substances 0.000 claims description 2
- 239000004033 plastic Substances 0.000 claims description 2
- 239000010813 municipal solid waste Substances 0.000 abstract description 10
- 230000000694 effects Effects 0.000 abstract description 3
- 239000000243 solution Substances 0.000 description 18
- 239000003921 oil Substances 0.000 description 13
- 235000019198 oils Nutrition 0.000 description 13
- 230000004151 fermentation Effects 0.000 description 11
- 241000894006 Bacteria Species 0.000 description 5
- 238000009264 composting Methods 0.000 description 5
- 229910002651 NO3 Inorganic materials 0.000 description 4
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 241000709785 Hermetia illucens Species 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- 235000021190 leftovers Nutrition 0.000 description 3
- CSNNHWWHGAXBCP-UHFFFAOYSA-L Magnesium sulfate Chemical compound [Mg+2].[O-][S+2]([O-])([O-])[O-] CSNNHWWHGAXBCP-UHFFFAOYSA-L 0.000 description 2
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 2
- 239000000370 acceptor Substances 0.000 description 2
- 150000001450 anions Chemical class 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 239000003344 environmental pollutant Substances 0.000 description 2
- 239000010794 food waste Substances 0.000 description 2
- 239000000852 hydrogen donor Substances 0.000 description 2
- 230000002262 irrigation Effects 0.000 description 2
- 238000003973 irrigation Methods 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 235000015097 nutrients Nutrition 0.000 description 2
- 239000005416 organic matter Substances 0.000 description 2
- 231100000719 pollutant Toxicity 0.000 description 2
- 230000035755 proliferation Effects 0.000 description 2
- 102000004169 proteins and genes Human genes 0.000 description 2
- 108090000623 proteins and genes Proteins 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- 239000012266 salt solution Substances 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 238000012216 screening Methods 0.000 description 2
- 238000005406 washing Methods 0.000 description 2
- 239000002351 wastewater Substances 0.000 description 2
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 description 1
- 239000004278 EU approved seasoning Substances 0.000 description 1
- 241001465754 Metazoa Species 0.000 description 1
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 description 1
- 229920002472 Starch Polymers 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 238000010564 aerobic fermentation Methods 0.000 description 1
- 239000010775 animal oil Substances 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 239000001110 calcium chloride Substances 0.000 description 1
- 229910001628 calcium chloride Inorganic materials 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 239000000084 colloidal system Substances 0.000 description 1
- 239000002361 compost Substances 0.000 description 1
- 238000010411 cooking Methods 0.000 description 1
- 230000000249 desinfective effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 235000013325 dietary fiber Nutrition 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 230000029087 digestion Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 239000003925 fat Substances 0.000 description 1
- 235000019197 fats Nutrition 0.000 description 1
- 235000011194 food seasoning agent 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
- 229910052943 magnesium sulfate Inorganic materials 0.000 description 1
- 235000019341 magnesium sulphate Nutrition 0.000 description 1
- 238000012423 maintenance Methods 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
- 230000002503 metabolic effect Effects 0.000 description 1
- 244000005700 microbiome Species 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 239000011780 sodium chloride Substances 0.000 description 1
- 229910052938 sodium sulfate Inorganic materials 0.000 description 1
- 235000011152 sodium sulphate Nutrition 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 239000008107 starch Substances 0.000 description 1
- 235000019698 starch Nutrition 0.000 description 1
- 239000006228 supernatant Substances 0.000 description 1
- 235000015112 vegetable and seed oil Nutrition 0.000 description 1
- 239000008158 vegetable oil Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
-
- C—CHEMISTRY; METALLURGY
- 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
-
- 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
- C02F1/30—Treatment of water, waste water, or sewage by irradiation
- C02F1/32—Treatment of water, waste water, or sewage by irradiation with ultraviolet light
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/441—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by reverse osmosis
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/442—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by nanofiltration
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/444—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by ultrafiltration or microfiltration
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/16—Nitrogen compounds, e.g. ammonia
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/06—Contaminated groundwater or leachate
-
- 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
-
- 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
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
- Physical Water Treatments (AREA)
Abstract
The application relates to the field of sewage treatment, in particular to a kitchen waste and leachate synergistic treatment process, which comprises the following steps: s1, pretreatment: after the kitchen waste is collected, carrying out pretreatment; s2, pulping: after pretreatment, pulping the kitchen waste, and performing anaerobic fermentation after pulping to obtain biogas slurry and biogas; s3, buffering and preprocessing: introducing the biogas slurry into an intermediate water tank for pretreatment, and performing coagulation air flotation to remove suspended oil in the biogas slurry after the pretreatment is finished; s4, MBR sewage treatment system: performing denitrification treatment on the biogas slurry from which the suspension oil is removed; s5, filtering: respectively carrying out ultrafiltration, nanofiltration and reverse osmosis treatment on the denitrification-treated biogas slurry to obtain clear liquid and concentrated liquid; s6, sterilization: and carrying out ultraviolet disinfection on the obtained clear liquid, and obtaining reclaimed water after the disinfection is finished. This application has the current kitchen garbage of improvement and leachate handles not good effect.
Description
Technical Field
The application relates to the field of sewage treatment, in particular to a kitchen waste and leachate synergistic treatment process.
Background
At present, kitchen waste (commonly called swill and swill) is a general name of food waste and kitchen waste, the kitchen waste refers to leftovers and leftovers discarded in daily cooking of residents, wherein the food waste is leftovers generated in commercial and public institutions such as restaurants, dining halls and the like, and is generally not suitable for direct composting treatment and returning to fields for utilization due to large salt content and oil content. The mixed kitchen waste is not suitable for direct composting treatment generally, and the existing treatment method is direct landfill or incineration, so that nutrient substances cannot be well utilized, and waste is caused. The kitchen waste contains rich nutrient substances, the novel treatment method is to obtain hermetia illucens protein by treating the kitchen waste through hermetia illucens, but the kitchen waste with high humidity is not suitable for the growth of hermetia illucens, and the kitchen waste is required to be subjected to filter pressing in the early stage and is discharged after being subjected to independent treatment on leachate to reach the standard. The kitchen waste leachate is black in color, complex in components, high in concentration of organic matters and ammonia nitrogen, mainly contains pollutants such as dietary fiber, starch, fat, animal and vegetable oil, various seasonings, protein and the like, is high in treatment cost, and a large amount of high-concentration wastewater cannot be well utilized.
During the transportation process of the kitchen waste, because the water content is as high as about 85 percent, a large amount of high-concentration organic wastewater is generated by extrusion in a transport vehicle, meanwhile, in the initial composting period, the water content is over 65 percent, and under the condition of high temperature of the composting, leachate is generated. Leachate of this high concentration of organic matter, which produces an extremely foul smell, is generally sprayed back onto the compost heap during the composting process. The membrane covering aerobic fermentation is generally divided into primary fermentation for 4 weeks and secondary fermentation for 2 weeks, and the leachate is sprayed back, and if before the primary fermentation, the leachate sprayed back flows out from the bottom due to high water content of kitchen garbage in the pile, so that pollution is caused again; if the secondary fermentation is carried out during pile turning, the secondary fermentation can be completely absorbed, and the effect of complete fermentation cannot be achieved due to too short time of subsequent fermentation. Meanwhile, the extremely putrefactive odor of the leachate can be emitted into the air during back spraying, so that severe environmental pollution is caused.
Disclosure of Invention
In order to improve the problem that current kitchen garbage and leachate treatment effect are not good, this application provides a kitchen garbage and leachate coprocessing process.
The application provides a kitchen garbage and leachate coprocessing process adopts following technical scheme:
a kitchen waste and leachate synergistic treatment process comprises the following steps:
s1, pretreatment: after the kitchen waste is collected, carrying out pretreatment;
s2, pulping: after pretreatment, pulping the kitchen waste, and performing anaerobic fermentation after pulping to obtain biogas slurry and biogas;
s3, buffering and preprocessing: introducing the biogas slurry into an intermediate water tank for pretreatment, and performing coagulation air flotation to remove suspended oil in the biogas slurry after the pretreatment is finished;
s4, MBR sewage treatment system: performing denitrification treatment on the biogas slurry from which the suspension oil is removed;
s5, filtering: respectively carrying out ultrafiltration, nanofiltration and reverse osmosis treatment on the denitrification-treated biogas slurry to obtain clear liquid and concentrated liquid;
s6, sterilization: and carrying out ultraviolet disinfection on the obtained clear liquid, and obtaining reclaimed water after the disinfection is finished.
Through adopting above-mentioned technical scheme, the kitchen garbage and filtration liquid coprocessing process that this application set up earlier sorts the kitchen garbage, sorts the back and carries out breakage and fermentation, and at the process of sorting kitchen garbage, breakage and fermentation, all go on in confined environment, have that the leakproofness is good, convenient operation, easy maintenance, be convenient for seal advantages such as transportation, greatly reduced the probability of peculiar smell diffusion in the kitchen garbage processing procedure.
Preferably, in step S1, the collected kitchen waste is first subjected to impurity removal and filtration to remove lump impurities such as plastic bags and sandstone contained in the kitchen waste.
Through adopting above-mentioned technical scheme, to kitchen garbage's screening, can reject away with the welded impurity of being difficult to earlier, improve the work efficiency of follow-up step.
Preferably, in step S2, the kitchen waste filtered in step S1 is crushed to prepare slurry, and the slurry is subjected to anaerobic fermentation to obtain biogas and biogas slurry, and the obtained biogas is recycled.
By adopting the technical scheme, the screened kitchen waste is crushed and made into slurry, so that the fermentation of the kitchen waste is facilitated, and the generated methane can be recycled in a memorable manner in the fermentation process, so that the utilization rate of the kitchen waste is improved, and resources are saved.
Preferably, in step S3, the obtained biogas slurry is buffered and pretreated, and after the treatment, coagulation air flotation treatment is performed to remove scum and suspended oil in the biogas slurry.
By adopting the technical scheme, the biogas slurry is introduced into the intermediate water tank for buffering and pretreatment, the concentration of the biogas slurry can be diluted by the arranged intermediate water tank, impurities such as silt in the biogas slurry can be naturally precipitated, the removal efficiency is improved, and the cost is saved; after the biogas slurry in the middle pond is diluted, coagulation air floatation treatment is carried out, and oil can float on the water surface because the density of the oil is lower than that of the water, so that the oil in the biogas slurry can be conveniently removed by workers.
Preferably, in step S4, the MBR sewage treatment system includes a plurality of denitrification treatment tanks and ultrafiltration treatment tanks, and the ultrafiltered liquid can flow back to the denitrification treatment tanks for further denitrification treatment.
By adopting the technical scheme, denitrification occurs under strict anoxic and anaerobic conditions, the denitrification process is completed by denitrifying bacteria, and under the anoxic condition, the denitrifying bacteria oxidize organic matters in water by taking organic matters as electron donors (hydrogen donors) and nitrate as final electron acceptors for energy production and proliferation; nitrate can circulate in a plurality of denitrification treatment pools, in order to ensure complete denitrification, a certain amount of organic matters must be added into the denitrification pools, and the arranged plurality of denitrification treatment pools can greatly remove impurities such as ammonia nitrogen, COD (chemical oxygen demand) and the like in the biogas slurry.
Preferably, in step S4, the biogas slurry from which the suspension oil and the scum have been removed is subjected to denitrification treatment to remove impurities such as ammonia nitrogen and COD from the biogas slurry.
Through adopting above-mentioned technical scheme, the efficiency of getting rid of ammonia nitrogen and COD impurity in the natural pond liquid has been improved to the multiunit denitrification processing pond that sets up.
Preferably, in step S3, the scum obtained by the coagulation air flotation and the sludge generated in the MBR system can flow into a sludge treatment system, an additive such as a flocculant and washing water is added to the sludge treatment system, and a clear dehydrated liquid and dry sludge containing water are obtained, and the clear dehydrated liquid can be returned to the MBR system.
By adopting the technical scheme, the sludge which cannot be treated by digestion reaction in the biogas slurry and the scum generated in the coagulation air floatation can be jointly flowed into the sludge treatment system in the step, the dry sludge which is not easy to dissolve and the clear dewatering liquid can be generated under the reaction of adding the chemical reagent, the generated dry sludge can be accumulated in the land of a community or a garden and can be reused, and the generated clear dewatering liquid can be flowed back to the MBR system again.
Preferably, in step S5, the biogas slurry after the denitrification treatment is respectively subjected to ultrafiltration, nanofiltration and reverse osmosis to reduce COD and conductance in the biogas slurry, and after the nanofiltration and reverse osmosis treatment, clear liquid and concentrated liquid can be obtained, and the concentrated liquid after the nanofiltration and reverse osmosis can flow into a set concentrated liquid tank.
Through adopting above-mentioned technical scheme, the natural pond liquid is after MBR system treatment, COD content in the solution is still about 800 and the ammonia nitrogen content in the solution still is not conform to normal standard, and the conductivity in the solution is higher, after filtering with reverse osmosis filtering in proper order through nanofiltration, can effectively get rid of ammonia nitrogen in the solution, COD and reduce the conductivity in the solution, the reverse osmosis that sets up handles, can get rid of almost all impurity in the solution, including harmful and profitable, reverse osmosis filters and only can allow the hydrone to pass through.
Preferably, in step S6, the supernatant obtained after the reverse osmosis treatment is subjected to uv disinfection to obtain recycled water.
By adopting the technical scheme, clear liquid after ultraviolet disinfection can reach certain water quality index, certain use requirement in life can be met, the obtained reclaimed water can be used for greening irrigation, vehicle flushing, road flushing, household toilet flushing and the like, the purpose of saving water is achieved, the cost of the reclaimed water is lowest from the economic perspective, and the sewage recycling helps to improve the ecological environment and realize the virtuous cycle of water ecology from the environmental protection perspective.
Drawings
Fig. 1 is a schematic overall structure diagram of an embodiment of the present application.
Detailed Description
The present application is described in further detail below with reference to fig. 1.
Referring to fig. 1, the embodiment of the application discloses a kitchen waste and leachate synergistic treatment process, which comprises the following steps:
s1, pretreatment: after the kitchen waste is collected, carrying out pretreatment;
after the kitchen waste is collected and is accomplished, screening is carried out, preliminary edulcoration and filtration are carried out, mainly get rid of the cubic impurity that is difficult to smash such as disposal bag and grit that contain in the kitchen waste, make things convenient for the processing of subsequent handling, improve kitchen waste's treatment effeciency.
S2, pulping: after pretreatment, pulping the kitchen waste, and performing anaerobic fermentation after pulping to obtain biogas slurry and biogas;
the kitchen waste screened in the step S1 can be crushed by a crusher and other devices to prepare slurry, the slurry can generate biogas slurry and biogas through the metabolic activity of microorganisms under the anaerobic condition, the generated biogas is convenient to transport and store, can be recycled, the kitchen waste can be converted and utilized, and the obtained biogas slurry can be subjected to subsequent treatment and processing.
S3, buffering and preprocessing: introducing the biogas slurry into an intermediate water tank for pretreatment, and performing coagulation air flotation to remove suspended oil in the biogas slurry after the pretreatment is finished;
the biogas slurry obtained in the step S2 can be introduced into an intermediate water tank for pretreatment, the concentration of the biogas slurry can be diluted by the intermediate water tank, impurities such as silt in the biogas slurry can be naturally precipitated, the removal efficiency is improved, and the cost is saved; after the biogas slurry in the middle pond is diluted, coagulation air floatation treatment is carried out, and oil can float on the water surface because the density of the oil is lower than that of the water, so that the oil in the biogas slurry can be conveniently removed by workers.
S4, MBR sewage treatment system: performing denitrification treatment on the biogas slurry from which the suspension oil is removed;
the MBR sewage treatment system comprises a plurality of denitrification treatment tanks and an ultrafiltration treatment tank which are connected in sequence, biogas slurry subjected to coagulation air flotation treatment can flow into the denitrification treatment tanks in sequence, denitrification occurs under strict anoxic and anaerobic conditions, the denitrification process is completed by denitrifying bacteria, and under the anoxic condition, the denitrifying bacteria take organic matters as electron donors (hydrogen donors) and nitrate as final electron acceptors to oxidize the organic matters in water for capacity and proliferation; nitrate can circulate in a plurality of denitrification treatment tanks, in order to ensure complete denitrification, a certain amount of organic matters must be added into the denitrification tanks, and the arranged plurality of groups of denitrification treatment tanks can greatly remove impurities such as ammonia nitrogen, COD and the like in the biogas slurry; the biogas slurry flows into the ultrafiltration tank after passing through the denitrification treatment tank, the ultrafiltration filtering precision is 0.001-0.1 micron, harmful substances such as rust, silt, suspended matters, colloid, bacteria, macromolecular organic matters and the like in the biogas slurry can be removed, the recovery rate of reclaimed water reaches more than 95% in the arranged ultrafiltration tank, voltage is not required to be added for ultrafiltration, filtration can be carried out only by the flowing pressure of water, the flow is large, the use cost is low, a wider treatment range can be realized, and pollutants in the water can be more completely eliminated;
the kitchen waste and leachate synergistic treatment process further comprises a sludge treatment system, scum generated after coagulation air flotation treatment and sludge generated after MBR system treatment can flow into the sludge treatment system, then certain flocculating agents, washing water and other materials are added into the sludge treatment system, dry mud with the water content of 80% and clear dewatering liquid are generated after chemical reaction occurs in the sludge treatment system, the generated dry mud can be accumulated in the land of a community or a garden, and the generated clear dewatering liquid can be washed and flow into the MBR system for denitrification treatment and ultrafiltration treatment.
S5, filtering: respectively carrying out ultrafiltration, nanofiltration and reverse osmosis treatment on the denitrification-treated biogas slurry to obtain clear liquid and concentrated liquid;
after the biogas slurry is treated by an MBR system, the COD content of the solution is about 800, the ammonia nitrogen content of the solution does not meet the normal standard, the conductivity of the solution is higher, after nanofiltration and reverse osmosis filtration are sequentially carried out, the ammonia nitrogen and the COD of the solution can be effectively removed, the conductivity of the solution is reduced, the operating interval of nanofiltration is between that of ultrafiltration and reverse osmosis, the molecular weight of the intercepted organic matter is about 200-400, the capacity of intercepting soluble salt is 20-98%, the removal rate of monovalent anion salt solution is lower than that of high-valence anion salt solution, such as sodium chloride and calcium chloride is 20-80%, and the removal rate of magnesium sulfate and sodium sulfate is 90-98%; the reverse osmosis has a filtration precision of about 0.0001 micron, can remove almost all impurities in the solution, including harmful and beneficial, and is provided with a reverse osmosis filter which only can allow water molecules to pass through.
The kitchen waste and leachate synergistic treatment process further comprises a concentrated solution pool, concentrated solution generated in the nanofiltration and reverse osmosis processes can flow into the concentrated solution pool to be stored, and clear solution after nanofiltration is subjected to reverse osmosis treatment and reverse osmosis treatment to finally obtain clear solution.
S6, sterilization: and carrying out ultraviolet disinfection on the obtained clear liquid, and obtaining reclaimed water after the disinfection is finished.
In the step S5, the clear liquid obtained after reverse osmosis is subjected to ultraviolet disinfection, a certain water quality index can be obtained, certain use requirements in life can be met, the obtained reclaimed water can be used for greening irrigation, vehicle flushing, road flushing, household toilet flushing and the like, the purpose of saving water is achieved, the cost of the reclaimed water is lowest from the economic perspective, and the sewage recycling is beneficial to improving the ecological environment and realizing the virtuous cycle of water ecology from the environmental protection perspective.
The implementation principle of the kitchen waste and leachate synergistic treatment process in the embodiment of the application is as follows: after sorting the recovered kitchen waste, crushing and pulping, after anaerobic fermentation, obtaining biogas slurry, after removing impurities in the biogas slurry through an intermediate water tank and coagulation air flotation, carrying out MBR system treatment, removing ammonia nitrogen and COD in the biogas slurry, after the treatment is completed, sequentially carrying out ultrafiltration, nanofiltration and reverse osmosis, further filtering the impurities in the solution, and sterilizing and disinfecting the filtered clear liquid to obtain reclaimed water capable of being recycled.
The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.
Claims (9)
1. A kitchen waste and leachate synergistic treatment process is characterized by comprising the following steps: the method comprises the following steps:
s1, pretreatment: after the kitchen waste is collected, carrying out pretreatment;
s2, pulping: after pretreatment, pulping the kitchen waste, and performing anaerobic fermentation after pulping to obtain biogas slurry and biogas;
s3, buffering and preprocessing: introducing the biogas slurry into an intermediate water tank for pretreatment, and performing coagulation air flotation to remove suspended oil in the biogas slurry after the pretreatment is finished;
s4, MBR sewage treatment system: performing denitrification treatment on the biogas slurry from which the suspension oil is removed;
s5, filtering: respectively carrying out ultrafiltration, nanofiltration and reverse osmosis treatment on the denitrification-treated biogas slurry to obtain clear liquid and concentrated liquid;
s6, sterilization: and carrying out ultraviolet disinfection on the obtained clear liquid, and obtaining reclaimed water after the disinfection is finished.
2. The kitchen waste and leachate synergistic treatment process according to claim 1, characterized in that: in step S1, the collected kitchen waste is first subjected to impurity removal and filtration to remove lumpy impurities such as plastic bags and sandstone contained in the kitchen waste.
3. The kitchen waste and leachate synergistic treatment process according to claim 1, characterized in that: in step S2, the kitchen waste filtered in step S1 is crushed to prepare slurry, the slurry is subjected to anaerobic fermentation to obtain biogas and biogas slurry, and the obtained biogas is recycled.
4. The kitchen waste and leachate synergistic treatment process according to claim 1, characterized in that: in step S3, the obtained biogas slurry is buffered and pretreated, and after the treatment is completed, coagulation air flotation treatment is performed to remove scum and suspended oil in the biogas slurry.
5. The kitchen waste and leachate synergistic treatment process according to claim 1, characterized in that: in step S4, the MBR sewage treatment system includes a plurality of denitrification treatment tanks and ultrafiltration treatment tanks, and the ultrafiltered liquid can flow back to the denitrification treatment tanks for further denitrification treatment.
6. The kitchen waste and leachate synergistic treatment process according to claim 5, characterized in that: in step S4, the biogas slurry from which the suspended oil and scum have been removed is subjected to denitrification treatment to remove impurities such as ammonia nitrogen and COD from the biogas slurry.
7. The kitchen waste and leachate synergistic treatment process according to claim 4 or 6, characterized in that: scum obtained through coagulation air floatation treatment and sludge generated in an MBR system can flow into a set sludge treatment system, additives such as flocculating agent, flushing water and the like are added into the sludge treatment system, clear dehydrated liquid and dry mud containing water are obtained, and the obtained clear dehydrated liquid can flow back into the MBR system.
8. The kitchen waste and leachate synergistic treatment process according to claim 1, characterized in that: in step S5, the biogas slurry after denitrification treatment is respectively subjected to ultrafiltration, nanofiltration and reverse osmosis to reduce COD and conductance in the biogas slurry, clear liquid and concentrated liquid can be obtained after nanofiltration and reverse osmosis treatment, and the concentrated liquid after nanofiltration and reverse osmosis can flow into a set concentrated liquid tank.
9. The kitchen waste and leachate synergistic treatment process according to claim 1, characterized in that: in step S6, the clear solution obtained after the reverse osmosis treatment is subjected to ultraviolet disinfection to obtain reclaimed water.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011310754.9A CN112358137A (en) | 2020-11-20 | 2020-11-20 | Kitchen waste and leachate synergistic treatment process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011310754.9A CN112358137A (en) | 2020-11-20 | 2020-11-20 | Kitchen waste and leachate synergistic treatment process |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112358137A true CN112358137A (en) | 2021-02-12 |
Family
ID=74533703
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011310754.9A Pending CN112358137A (en) | 2020-11-20 | 2020-11-20 | Kitchen waste and leachate synergistic treatment process |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112358137A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113321306A (en) * | 2021-07-01 | 2021-08-31 | 上海环境卫生工程设计院有限公司 | Biochemical advanced treatment method for domestic waste leachate |
| CN113526792A (en) * | 2021-07-26 | 2021-10-22 | 江苏中车环保设备有限公司 | Method and system for resourceful treatment of kitchen waste water |
| CN113578919A (en) * | 2021-07-19 | 2021-11-02 | 上海大学 | Method for improving dehydration performance of kitchen waste anaerobic digestion biogas residues |
| CN114472454A (en) * | 2022-02-17 | 2022-05-13 | 苏州华益洁环境能源技术有限公司 | Kitchen waste treatment process |
| CN114871253A (en) * | 2022-07-08 | 2022-08-09 | 天津高能时代水处理科技有限公司 | Kitchen waste leachate treatment system and method |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107628729A (en) * | 2017-10-27 | 2018-01-26 | 银川保绿特生物技术有限公司 | A kind of food waste percolate recycling treatment system and method |
| CN107857437A (en) * | 2017-11-30 | 2018-03-30 | 重庆三峰环境产业集团有限公司 | A kind of method and system for handling mixing percolate |
| CN110092536A (en) * | 2019-04-25 | 2019-08-06 | 无锡市政设计研究院有限公司 | A kind of kitchen anaerobic digestion biogas slurry combined treatment process |
| CN110357350A (en) * | 2019-07-02 | 2019-10-22 | 广州鹏凯环境科技股份有限公司 | A kind for the treatment of process for landfill leachate |
-
2020
- 2020-11-20 CN CN202011310754.9A patent/CN112358137A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107628729A (en) * | 2017-10-27 | 2018-01-26 | 银川保绿特生物技术有限公司 | A kind of food waste percolate recycling treatment system and method |
| CN107857437A (en) * | 2017-11-30 | 2018-03-30 | 重庆三峰环境产业集团有限公司 | A kind of method and system for handling mixing percolate |
| CN110092536A (en) * | 2019-04-25 | 2019-08-06 | 无锡市政设计研究院有限公司 | A kind of kitchen anaerobic digestion biogas slurry combined treatment process |
| CN110357350A (en) * | 2019-07-02 | 2019-10-22 | 广州鹏凯环境科技股份有限公司 | A kind for the treatment of process for landfill leachate |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113321306A (en) * | 2021-07-01 | 2021-08-31 | 上海环境卫生工程设计院有限公司 | Biochemical advanced treatment method for domestic waste leachate |
| CN113578919A (en) * | 2021-07-19 | 2021-11-02 | 上海大学 | Method for improving dehydration performance of kitchen waste anaerobic digestion biogas residues |
| CN113578919B (en) * | 2021-07-19 | 2022-09-09 | 上海大学 | Method for improving dehydration performance of kitchen waste anaerobic digestion biogas residues |
| CN113526792A (en) * | 2021-07-26 | 2021-10-22 | 江苏中车环保设备有限公司 | Method and system for resourceful treatment of kitchen waste water |
| CN114472454A (en) * | 2022-02-17 | 2022-05-13 | 苏州华益洁环境能源技术有限公司 | Kitchen waste treatment process |
| CN114871253A (en) * | 2022-07-08 | 2022-08-09 | 天津高能时代水处理科技有限公司 | Kitchen waste leachate treatment system and method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN112358137A (en) | Kitchen waste and leachate synergistic treatment process | |
| CN108467161B (en) | Advanced treatment method for landfill leachate tail water | |
| CN101481194B (en) | town domestic sewage treatment process | |
| CN100371270C (en) | Combined treatment process for manioc producing effluent | |
| CN106957130B (en) | Treatment method of domestic sewage and organic solid waste | |
| CN204625440U (en) | Domestic waste Leachate site zero-discharge treatment system | |
| CN103524001B (en) | Treatment method for high fat food processing wastewater | |
| CN103288302B (en) | Livestock/poultry breeding wastewater resource utilization and treatment device | |
| CN203307182U (en) | Resource utilization and regenerative recycling device of livestock and poultry breeding wastewater | |
| CN111606517A (en) | Breeding wastewater treatment process | |
| CN106277655A (en) | Method for treating garbage percolation liquid and system | |
| CN208362111U (en) | A kind of urban sewage treatment system | |
| CN113698049A (en) | Process for treating and recycling pig-raising wastewater containing water-washed manure and water-soaked manure | |
| CN110038874A (en) | Categorized consumer waste processing method | |
| CN105347606B (en) | A kind of Methanol Protein waste water treatment process | |
| CN210620525U (en) | Water-fertilizer co-production device for breeding manure | |
| CN203333441U (en) | Resource utilization and treatment device of livestock and poultry breeding waste water | |
| CN110734199A (en) | garlic processing wastewater treatment process | |
| CN114436467A (en) | Integrated device and method for treating leachate of garbage transfer station | |
| CN1318328C (en) | Process for treating organic sewage by three section method and its apparatus | |
| CN112474711A (en) | Kitchen waste treatment system | |
| CN207227239U (en) | A kind of garbage percolation liquid treating system | |
| CN113307451A (en) | Method and system for treating excrement in pig farm | |
| KR20010001588A (en) | Food waste aerobic/anaerobic co-ferementation process | |
| CN112159038A (en) | System and method for treating and recycling tail water of aquaculture pond |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20210212 |