CN118956980A - A kitchen waste treatment process - Google Patents

Abstract

The present application relates to a restaurant kitchen waste treatment process, and to the field of restaurant kitchen waste treatment technology, which includes the following steps: S1: pretreatment system: transporting the restaurant kitchen waste to a treatment plant through a collection and transportation vehicle, and pre-treating the waste; S2: anaerobic fermentation system: the water separated by the three-phase separator enters the water settling tank, and the separated water is evenly mixed through a homogenization tank, and then passed into the anaerobic digestion tank for digestion reaction to produce biogas; S3: solid-liquid separation: the liquid in the anaerobic digestion tank is separated by a two-phase separator; S4: biogas purification system: adopting the process of "biological crude desulfurization + dry fine desulfurization"; S5: deodorization system: collecting the odor generated by the pretreatment workshop, dehydration workshop, composting workshop, and sewage treatment system, and centrally treating it by combining pretreatment and low-temperature plasma; S6: sewage treatment system. The present application has the effect of improving the current environmental protection requirements for waste treatment that cannot be met.

Description

Kitchen waste treatment process

Technical Field

The application relates to the technical field of kitchen waste treatment, in particular to a kitchen waste treatment process.

Background

The kitchen waste is a general term of food waste and kitchen waste, the water content, the oil and the salt content in the kitchen waste are higher than those in other wastes, and the kitchen waste is rich in nutrient elements such as nitrogen, phosphorus, potassium and the like, and is rich in organic matters such as protein, starch, cellulose, fat and the like, has higher bioenergy, and the kitchen waste needs to be treated to realize conversion and utilization.

In the related art, the method for treating the kitchen waste is to construct a landfill site, and after the landfill site is constructed, personnel transport the kitchen waste to the landfill site through a transport vehicle, and then landfill the kitchen waste, thereby treating the kitchen waste.

Aiming at the related technology, kitchen waste can be treated by landfill, the exudates of the kitchen waste pollute underground water and soil, the odor generated by stacking the waste seriously affects the air quality, and the irreversible secondary pollution to the surrounding atmosphere and water and soil in a large range is formed, so that the current environmental protection requirement on waste treatment cannot be met.

Disclosure of Invention

In order to solve the problem that the current environmental protection requirement on waste treatment cannot be met, the application provides a kitchen waste treatment process.

The kitchen waste treatment process provided by the application adopts the following technical scheme:

a kitchen waste treatment process, comprising the following steps:

S1: pretreatment system: conveying kitchen waste to a treatment plant through a collection and transportation vehicle, preprocessing the waste, enabling an oil-water mixture in a slurry cache tank to enter a slurry pool and uniformly mixing materials screened in the slurry pool, steaming the slurry after impurity removal, separating the slurry through a three-phase separator, and enabling solids to enter a slurry homogenizing tank;

S2: anaerobic fermentation system: the water separated by the three-phase separator enters a water sedimentation tank, and after being uniformly mixed by a slurry homogenizing tank, the separated water is introduced into an anaerobic digestion tank for digestion reaction to generate biogas, and the biogas is treated;

S3: solid-liquid separation: separating the liquid in the anaerobic digestion tank by a two-phase separator, thereby producing a water phase and a solid phase;

S4: biogas purification system: the process of biological coarse desulfurization and dry fine desulfurization is adopted, so that the H2S concentration can be directly reduced to about 50ppm;

S5: deodorization system: collecting and intensively treating odor generated by a pretreatment workshop, a dehydration workshop, a composting workshop and a sewage treatment system in a mode of combining pretreatment and low-temperature plasma;

s6: a sewage treatment system: and (5) treating the sewage to reach the standard and discharging.

Through the technical scheme, when kitchen waste is required to be treated, the kitchen waste is transported to a treatment plant through a collection and transportation vehicle, the kitchen waste is pretreated, an oil-water mixture in a slurry cache tank enters a slurry pond and materials screened by the slurry pond to be uniformly mixed, the mixed materials are subjected to impurity removal and cooking, then slurry is separated through a three-phase separator, solids enter a slurry homogenizing tank, water in a water sedimentation tank is introduced into the slurry homogenizing tank so as to be mixed with the solids in the slurry homogenizing tank, and then the mixture enters an anaerobic digestion tank to be subjected to digestion reaction, biogas is generated, and the biogas is treated; separating liquid in the anaerobic digestion tank by a two-phase separator, purifying biogas by adopting a process of biological coarse desulfurization and dry fine desulfurization, collecting odor generated by pretreatment workshops, dehydration workshops, composting workshops and sewage treatment systems, carrying out centralized treatment by combining pretreatment and low-temperature plasmas, then treating sewage to reach the standard, and discharging the sewage, the treated slurry is introduced into the anaerobic digestion tank to perform digestion reaction, so that biogas is generated, the biogas is cleaned, resource utilization is achieved, the process of biological coarse desulfurization and dry fine desulfurization combines the economical efficiency of biological desulfurization and the high efficiency of dry desulfurization, deep removal of sulfides can be realized, meanwhile, the running cost and the environmental influence are reduced, and the sewage treatment reaches the standard and is discharged, so that the current environmental protection requirement on waste treatment can be met.

Optionally, the step S2 includes:

S21: uniformly mixing the slurry: the slurry is pumped into a slurry homogenizing tank through a centrifugal pump, the slurry is mixed and blended with the solid in the slurry homogenizing tank, and the uniformly blended material is sent to a hydrolysis desanding tank of an anaerobic digestion system;

S22: anaerobic digestion reaction: after the pretreated material meets the requirements of an anaerobic digestion system, firstly, hydrolytic acidification is carried out in a hydrolytic acidification tank, the acidizing fluid after hydrolytic acidification is sent to a fully-mixed anaerobic digestion tank for digestion reaction, and the digestion fluid after the anaerobic digestion reaction overflows into a digestion fluid storage tank for temporary storage, so that biogas is generated, and the biogas is treated.

Through adopting above-mentioned technical scheme, let in the homogenate jar with thick liquid and mix the allotment, after the material after the preliminary treatment satisfies the requirement of advancing anaerobic digestion system, at first carry out hydrolytic acidification in hydrolytic acidification jar, send the acidizing fluid in the hydrolytic acidification jar to the anaerobic digestion jar in and carry out digestion reaction, the digestion liquid overflow after the anaerobic digestion reaction carries out temporary storage in the digestion liquid storage jar, is convenient for produce marsh gas to can handle marsh gas, reach the requirement of environmental protection, carry out resource utilization.

Optionally, the step S22 includes

Biogas treatment: the collected biogas is desulfurized, enters a biogas storage cabinet, and the purified biogas is sent to a boiler system for combustion and utilization, so that the biogas can be used for steaming slurry after impurity removal, and the biogas can be sent to a torch for combustion when equipment fails or overhauls.

By adopting the technical scheme, the collected biogas is subjected to desulfurization treatment, enters the biogas storage cabinet, and the purified biogas is sent to a boiler system for combustion and utilization, so that the biogas can be used for steaming slurry after impurity removal, and the resource utilization of the biogas can be achieved.

Optionally, the step S1 of disposing of the waste includes

Extrusion treatment: pouring kitchen waste into a receiving hopper of a specified receiving device, separating liquid and solid waste in the kitchen waste through the receiving hopper, storing percolate which is leached out in the material conveying process into a slurry cache tank, conveying the solid material to a high-pressure extruder, extruding the solid material through the extruder, and introducing water in the material and sundries with the particle size less than 10mm into the cache tank through a filtering hole;

The materials in the buffer tank are diluted and blended by an oil-water mixture in a liquid draining tank, the materials after being uniformly mixed enter a impurity removing machine through a screw pump, and the impurity removing machine separates impurities with the particle size of more than 3mm in the materials.

Through adopting above-mentioned technical scheme, pour kitchen waste into appointed receiving hopper, separate liquid and the solid in the kitchen waste through receiving hopper, the percolate that drips out in the material transmission in-process is stored to thick liquid buffer tank, carry the solid material of high-pressure extruder through the extruder extrusion, moisture in the material and debris that the particle diameter is less than 10mm are led to the filtration pore, get into the buffer tank, further can separate the kitchen waste, the follow-up processing operation of being convenient for to the processing of kitchen waste is convenient for.

Optionally, the step S1 of disposing of the waste includes

Crushing: pouring kitchen waste into a receiving hopper of a specified receiving device, separating liquid and solid waste in the kitchen waste through the receiving hopper, storing percolate which is leached in the material conveying process into a slurry cache tank, scattering materials which are conveyed to a large material sorting machine by a mechanical swing leg, conveying materials with the particle size of more than 50mm in the materials to a vertical crusher through a screw, crushing the materials with the particle size of less than 1cm to a sand setting machine through the screw, slowly rotating the materials through a rotating drum, enabling effective slurry to enter a slurry pool through an overflow port at the upper end of the sand setting machine, and separating impurities through a impurity removing machine.

Through adopting above-mentioned technical scheme, pour kitchen waste into appointed receiving hopper that connects material device, separate liquid and solid waste in the kitchen waste through receiving hopper, the leachate that leaches in the material transmission in-process is stored to thick liquid buffer tank, and the solid is broken through the breaker, further can separate kitchen waste, the follow-up processing operation of being convenient for to the processing of kitchen waste.

Optionally, the step S1 includes

S12: cooking the slurry: the slurry after impurity removal enters a storage box for buffering, then is pumped into a cooking tank through a centrifugal pump, and is heated through low-pressure steam in the pumping process, so that the temperature of the slurry in the cooking tank reaches 80 ℃, and the slurry is kept stand for 1-2 hours, so that grease is easier to extract;

s13: separating the slurry: the slurry in the digestion tank enters a three-phase separator through a screw pump, and the three-phase separator divides the slurry into a water phase, an oil phase and a solid phase.

By adopting the technical scheme, the slurry after impurity removal is sent to a cooking tank, then the cooking tank is heated, the temperature of the slurry in the cooking tank reaches 80 ℃, the slurry is kept stand for 1-2 hours, the grease is conveniently extracted, the slurry in the cooking tank is separated into a water phase, an oil phase and a solid phase through a three-phase separator, and the generated crude grease enters a crude oil settling tank for temporary storage; the crude oil sedimentation tank is temporarily stored in an oil tank after oil-water separation and then is sold, the solid phase organic matter content generated by centrifugation is high, and the crude oil sedimentation tank can be used for cultivation and can be sold, so that kitchen waste is further convenient to treat.

Optionally, in the step S22, a stirrer is arranged at the top of the digestion reaction to ensure that the materials in the tank are uniform, and the material liquid in the digestion reaction tank enters a mud-water heat exchanger through a centrifugal pump, and in the mud-water heat exchanger, the materials exchange heat with circulating water to regulate and control the temperature of the materials in the anaerobic digestion tank.

By adopting the technical scheme, materials meeting the requirements of entering an anaerobic digestion system are sent into the anaerobic digestion tank, and the stirrer is arranged at the top of the digestion reaction, so that on one hand, the materials in the anaerobic digestion tank can be ensured to react uniformly; on the other hand, the digestion reaction is accelerated.

Optionally, a stirrer is arranged at the middle bottom of the digestion liquid storage tank to stir the digestion liquid periodically to prevent the digestion liquid from precipitating.

Through adopting above-mentioned technical scheme, through setting up the digestive juice storage tank middle bottom and being equipped with the agitator, can regularly stir the digestive juice, prevent that the digestive juice from deposiing.

Optionally, in the step S21, the slurry is mixed and prepared in a slurry homogenizing tank, and the solid content of the slurry in the slurry homogenizing tank is controlled to be about 8% ± 2.

By adopting the technical scheme, the slurry is mixed with the solid in the slurry homogenizing tank, the solid content of the slurry in the slurry homogenizing tank is controlled to be about 8+/-2, and the subsequent anaerobic digestion reaction is facilitated.

Optionally, in step S6, the sewage enters the equalizing basin and the accident pool, the water in the equalizing basin and the accident pool firstly enters the hydrolysis-acidification pool through the equalizing basin lift pump and the accident pool lift pump, the water in the hydrolysis-acidification pool overflows to the first-stage a, the first-stage O, the second-stage a, the second-stage O and the MBR membrane pool in sequence for treatment, the membrane group in the MBR membrane pool has mud-water separation and interception effects through the suction effect of the water producing pump, and the intercepted sludge flows back to the first-stage a through the sludge reflux pump.

By adopting the technical scheme, sewage firstly enters the regulating tank, the regulating tank is filled with the sewage and then enters the accident tank, when the sewage enters the first-stage A, the first-stage A usually refers to an anaerobic treatment unit, the microorganism further decomposes organic matters in the sewage into simpler compounds under the anaerobic condition, then the sewage enters the first-stage O, the microorganism oxidizes the organic matters in the sewage into carbon dioxide and water under the aerobic condition, ammonia nitrogen and partial phosphorus can be removed at the same time, the process can further improve the removal rate of the organic matters, simultaneously primarily remove nutrient substances such as nitrogen and phosphorus, the microorganism can more effectively remove refractory organic matters in the sewage, simultaneously promote the stabilization of the sludge, the second-stage O can more thoroughly oxidize the organic matters, simultaneously deeply remove nutrient substances such as nitrogen and phosphorus, ensure that the effluent quality reaches the standard, the membrane group in the MBR membrane tank has the separation and interception functions through the suction function of the water pump, and the sewage can be discharged after the sewage reaches the standard through the sludge reflux pump to the first-stage A, and the sewage can be repeatedly treated and the interception can be ensured.

In summary, the present application includes at least one of the following beneficial technical effects:

1. Compared with the related art, the method has the advantages that the treated slurry is introduced into the anaerobic digestion tank for digestion reaction, so that biogas is generated, the biogas is cleaned, the resource utilization is achieved, the biological coarse desulfurization and dry fine desulfurization process combines the economy of biological desulfurization and the high efficiency of dry desulfurization, the deep removal of sulfides can be realized, meanwhile, the running cost and the environmental influence are reduced, and the sewage treatment is discharged after reaching the standard, so that the current environmental protection requirement on waste treatment can be met;

2. after the pretreated material meets the requirements of entering an anaerobic digestion system, firstly, hydrolyzing and acidifying in a hydrolysis acidification tank, then, conveying an acidification liquid in the hydrolysis acidification tank into the anaerobic digestion tank for digestion reaction, and overflowing the digestion liquid after the anaerobic digestion reaction into a digestion liquid storage tank for temporary storage so as to be convenient for generating biogas, thereby being capable of treating the biogas, meeting the requirements of environmental protection and utilizing resources;

3. the collected biogas is desulfurized, enters a biogas storage cabinet, and the purified biogas is sent to a boiler system for combustion and utilization, so that the purified biogas can be used for steaming slurry after impurity removal, and the resource utilization of the biogas can be achieved.

Drawings

FIG. 1 is a process flow diagram of an embodiment of the present application.

Detailed Description

The present application will be described in further detail with reference to fig. 1.

The embodiment of the application discloses a kitchen waste treatment process.

Referring to fig. 1, a kitchen waste treatment process includes the steps of:

S1: pretreatment system

S11: waste treatment

Extrusion treatment: the kitchen waste is transported by a receiving and transporting vehicle, the kitchen waste receiving and transporting vehicle after weighing and metering by a wagon balance is driven into a discharge hall of a treatment plant, the kitchen waste is poured into a receiving hopper of a specified receiving device, liquid and solid waste in the kitchen waste are separated by the receiving hopper, the kitchen waste is transported to a high-pressure extrusion press by a shaftless screw conveyor with a draining function at the bottom of the receiving hopper, and percolate which is drained in the material transportation process is stored in a slurry cache tank; solid materials conveyed to the high-pressure extruder are extruded by the extruder, moisture and sundries with particle size smaller than 10mm in the materials are conveyed to the inlet of the plunger pump by the screw and then are temporarily stored in the buffer tank by the plunger pumps. And removing the dry sundries extruded by the extruder from a slag discharge port, and conveying the dry sundries to a hook vehicle for external transportation treatment through screw conveying.

The materials in the buffer tank are diluted and blended by the oil-water mixture in the liquid draining tank, and the buffer tank is provided with stirring, so that the materials and the oil-water mixture can be uniformly mixed; the evenly mixed materials are pumped out through a screw pump to enter a impurity removing machine, the impurity removing machine separates impurities with the particle size of more than 3mm in the materials, such as bottle caps, chopsticks, small-particle hard particle impurities, light impurities such as plastics, paper and the like, and the impurities are discharged from a slag discharging port and conveyed to a hook vehicle for external transportation treatment through a screw conveyor.

Crushing: the kitchen waste collecting and transporting vehicle after weighing and metering by the wagon balance is driven into a discharge hall of a treatment plant, the kitchen waste is poured into a receiving hopper of a specified receiving device, liquid and solid waste in the kitchen waste are separated through the receiving hopper, the material is conveyed to a large material sorting machine through a shaftless screw conveyor with a draining function at the bottom, percolate drained in the material conveying process is stored into a slurry buffer tank, the material conveyed to the large material sorting machine by the solid is broken up by a mechanical swing leg, under the swing action of the swing leg, sundries with the grain size smaller than 50mm in the waste are discharged through a fine discharge port by a screen mesh, the material with the grain size larger than 5cm is screened through the shaftless screw conveyor, the material with the grain size larger than 50 cm in the material is conveyed to a vertical crusher through the screw conveyor, the material is crushed by a cutter head under the action of a high-speed rotating centrifugal force, the sundries with the grain size larger than 1cm are conveyed to the screw conveyor through the screw conveyor, the sundries with the grain size smaller than 1cm are conveyed to a slurry settling tank through the screw conveyor, the sand settling tank is conveyed to the outer side of the slurry through the screw conveyor, and then enters the slurry settling tank through the high-efficiency hopper, and the sand is conveyed to the settling tank through the upper end of the screw conveyor.

The extrusion treatment and the crushing treatment can be carried out by selecting one of the kitchen waste treatment and the kitchen waste treatment by adopting two treatment methods simultaneously.

S12: cooking the slurry: the oil-water mixture in the slurry cache tank enters a slurry tank and is uniformly mixed with materials in the slurry tank; the evenly mixed materials are pumped into a impurity removing machine through an Aus Long Beng, impurities with the particle size of more than 3mm in the materials are separated by the impurity removing machine, such as bottle caps, chopsticks, small-particle hard particle impurities, plastic, paper and other light impurities, the impurities are discharged from a slag discharging port and conveyed to a hook vehicle for outward transportation treatment through a screw conveyor, the slurry after impurity removal enters a storage box for buffering, then the slurry is pumped into a stewing tank through a centrifugal pump, the slurry is heated through low-pressure steam in the pumping process, the pressure of the low-pressure steam is 0.4MPa, the temperature is 142 ℃, the temperature of the slurry entering the stewing tank is guaranteed to be 80 ℃, and the slurry is kept for 1-2 hours, so that the grease is easier to extract.

S13: separating the slurry: the slurry in the digestion tank enters a three-phase separator through a screw pump, the three-phase separator divides the slurry into a water phase, an oil phase and a solid phase, the solid phase generated by centrifugation has high organic matter content and can be used for cultivation, the slurry can be sold out, the solid part generated by centrifugation falls into a homogenizing tank, the generated separated water enters a water sedimentation tank for temporary storage, and the generated separated water can also be used for water required by the crusher during operation, and the generated crude oil enters a crude oil sedimentation tank for temporary storage; the crude oil is temporarily stored in an oil tank after oil-water separation in a crude oil sedimentation tank and then is sold.

S2: anaerobic fermentation system

S21: uniformly mixing the slurry: the water in the water sedimentation tank is pumped into the homogenizing tank through a centrifugal pump to be mixed and blended with the solid in the homogenizing tank, the solid content of the slurry in the homogenizing tank is controlled to be about 8+/-2, and the uniformly blended material is pumped into a hydrolysis sand removal tank of an anaerobic digestion system through a screw pump.

S22: anaerobic digestion: after the pretreated material meets the requirements of an anaerobic digestion system, hydrolysis acidification is carried out in a hydrolysis acidification tank, the bottom of the hydrolysis acidification tank is provided with side stirring, a sand removing pump is started to remove sand according to the amount of sand deposit in the tank in the hydrolysis acidification process, the acidified liquid after hydrolysis acidification is pumped into a fully-mixed anaerobic digestion tank through a screw to carry out digestion reaction, a stirrer is arranged at the top of the digestion reaction, the material liquid in the digestion reaction tank enters a mud-water heat exchanger through a centrifugal pump, and in the mud-water heat exchanger, the material and circulating water (cooling water for summer and hot water for winter) are subjected to heat exchange, so that the temperature of the material in the anaerobic digestion tank is regulated and controlled to ensure the temperature (52-55 ℃) of the digestion reaction in the digestion reaction tank, and biogas generated in the anaerobic digestion tank is treated.

S221: biogas treatment: the digestion liquid overflowed after anaerobic digestion reaction is temporarily stored in a digestion liquid storage tank, the digestion liquid is reserved for 50 days in the anaerobic digestion tank, methane can be generated for utilization, the collected methane is desulfurized and enters a methane storage cabinet, the purified methane is sent to a boiler system for combustion and utilization, the methane can be used for heating the digestion tank and also can be used for methane power generation for energy utilization, when equipment fails or overhauls, the methane can be sent to a torch for combustion, a stirrer is arranged at the middle bottom of the digestion liquid storage tank, the digestion liquid is periodically stirred to prevent the digestion liquid from precipitating, the digestion liquid is pumped to a dehydration unit through a screw rod for dehydration treatment, dehydrated methane residues enter a composting workshop through a screw, and after the dehydrated supernatant is subjected to barrate grid, the dehydrated supernatant is sent to a sewage treatment system for treatment through muddy water heat exchange and cooling.

S3: solid-liquid separation: the liquid in the anaerobic digestion tank is separated by a two-phase separator, thereby producing a water phase and a solid phase, which can be disposed of outside and can be used as a cement raw material.

S4: biogas purification system: the system adopts the process of biological coarse desulfurization and dry fine desulfurization, so that the biological desulfurization system can directly reduce the concentration of H ₂ S to about 50ppm, and the dry desulfurization can control the final H ₂ S to be within 5ppm (7 mg/m).

Biological coarse desulfurization: biological desulfurization is a desulfurization process performed at normal temperature and pressure using microorganisms (such as sulfur oxidizing bacteria) capable of oxidizing sulfides such as hydrogen sulfide to elemental sulfur or sulfate. Biological desulfurization is typically performed in a bioreactor, which is effective in removing most of the sulfides in the gas.

Dry type fine desulfurization: dry desulfurization is a chemical process that typically uses solid adsorbents or reactants, such as iron oxide, activated carbon, or limestone, to further remove sulfur compounds from the gas, and may be performed after biological desulfurization to remove residual sulfur compounds, to ensure that the gas meets stricter emission standards or meets specific industrial application requirements.

The biological coarse desulfurization and dry fine desulfurization process combines the economical efficiency of biological desulfurization with the high efficiency of dry desulfurization, can realize deep removal of sulfides, and reduces the running cost and the environmental impact.

S5: deodorization system: collecting and intensively treating odor generated by a pretreatment workshop, a dehydration workshop, a composting workshop and a sewage treatment system, wherein the odor treatment process comprises the following steps of: the pretreatment, low-temperature plasma and chimney discharge are widely used in wastewater treatment, and the ozone pre-oxidation process can effectively remove pollutants such as COD, BOD, phenol, cyanide, iron, manganese and the like, and has the advantages of quick reaction, less consumption, convenient operation, no secondary pollution and the like; the low-temperature plasma technology is a method for treating pollutants by utilizing non-thermal balance plasma, the low-temperature plasma is generated by a high-voltage electrode, and the ozone and ultraviolet light catalysis function are combined, so that the refractory organic compounds in water can be effectively degraded, the treatment efficiency is improved, the ozone pretreatment is combined with the low-temperature plasma, the efficiency of water treatment and air purification can be effectively improved, and the deep removal of the pollutants is realized; when the landfill leachate is treated, the organic compounds which are difficult to degrade are pretreated and degraded by ozone, and then the organic compounds are further treated by a low-temperature plasma technology, so that pollutants such as nitrogen, COD and the like in water can be effectively removed, and the deep purification of water quality is realized.

S6: a sewage treatment system: the process sewage is mainly anaerobic biogas slurry, the anaerobic biogas slurry enters an adjusting tank and an accident tank for homogenization and average quantity after desliming, the adjusting tank is mainly used, if the adjusting tank is full, the sewage enters the accident tank again, the adjusting tank and the accident tank water firstly enter a hydrolytic acidification tank through an adjusting tank lifting pump and an accident tank lifting pump, the water in the hydrolytic acidification tank overflows to a first-stage A, a first-stage O, a second-stage A and a second-stage O, MBR membrane tank in sequence, the first-stage A is usually an anaerobic treatment unit, microorganisms in the anaerobic treatment unit further decompose organic matters in the sewage into simpler compounds under the anaerobic condition, most of the organic matters in the sewage can be removed in the process, and biological gases such as methane are produced at the same time and can be recovered as energy sources; the first-stage O refers to an aerobic treatment unit, and microorganisms oxidize organic matters in sewage into carbon dioxide and water under the aerobic condition, and ammonia nitrogen and partial phosphorus can be removed. The process can further improve the removal rate of organic matters, and simultaneously, primarily remove nutrient substances such as nitrogen, phosphorus and the like; the second stage A is a second anaerobic treatment unit which has the similar function as the first stage A, but at the stage, microorganisms can more effectively remove refractory organic matters in the sewage, and simultaneously promote the stabilization of the sludge; the second-stage O is a second aerobic treatment unit, the function of which is similar to that of the first-stage O, but at the stage, microorganisms can oxidize organic matters more thoroughly, and meanwhile, deep removal of nutrient substances such as nitrogen and phosphorus is carried out, so that the quality of effluent reaches the standard; the membrane group in the MBR membrane pond has mud-water separation and interception through the suction effect of the water producing pump, the intercepted sludge flows back to the first-stage A pond through the sludge reflux pump, the redundant sludge flows back to the sludge storage pond for storage, and the MBR membrane group produced water is pumped into the factory total discharge port through the water producing pump and is discharged after reaching the standard.

The implementation principle of the kitchen waste treatment process provided by the embodiment of the application is as follows: when kitchen waste is required to be treated, firstly, the kitchen waste is transported to a treatment plant through a collection and transportation vehicle, solids and liquid in the kitchen waste are separated, the slurry after impurity removal enters a cooking tank for cooking, standing is carried out for 1-2 hours, grease is easier to extract, the slurry is separated into a water phase, an oil phase and a solid phase through a three-phase separator, after the pretreated material meets the requirement of entering an anaerobic digestion system, the material is firstly hydrolyzed and acidified in a hydrolysis acidification tank, digestion reaction is carried out through the anaerobic digestion tank to generate methane, the methane is treated, then, the liquid in the anaerobic digestion tank is subjected to solid-liquid separation through a two-phase separator, the process of biological coarse desulfurization and dry fine desulfurization is adopted for purifying, the odor collection generated by a pretreatment workshop, a dehydration workshop, a composting workshop and a sewage treatment system is subjected to centralized treatment, and finally, the sewage is treated through a sewage treatment system, and is discharged after reaching the standard.

The above embodiments are not intended to limit the scope of the present application, so: all equivalent changes in structure, shape and principle of the application should be covered in the scope of protection of the application.

Claims (10)

1. A process for treating kitchen waste, characterized in that it comprises the following steps: S1: Pretreatment system: The kitchen waste is transported to the treatment plant by a collection vehicle, and the waste is pretreated. The oil-water mixture in the slurry buffer tank enters the slurry pool and is evenly mixed with the screened materials in the slurry pool. The slurry after impurities removal is steamed, and the slurry is separated by a three-phase separator, and the solid enters the homogenization tank; S2: Anaerobic fermentation system: The water separated by the three-phase separator enters the water settling tank. After the separated water is evenly mixed in the homogenization tank, it enters the anaerobic digestion tank for digestion reaction to produce biogas, which is then treated; S3: Solid-liquid separation: The liquid in the anaerobic digester is separated by a two-phase separator to produce a water phase and a solid phase; S4: Biogas purification system: Using the process of "biological crude desulfurization + dry fine desulfurization", the H ₂ S concentration can be directly reduced to about 50ppm; S5: Deodorization system: The odor generated by the pretreatment workshop, dehydration workshop, composting workshop, and sewage treatment system is collected and treated centrally through a combination of pretreatment and low-temperature plasma; S6: Sewage treatment system: sewage is treated and discharged after meeting the standards. 2. The process for treating kitchen waste according to claim 1, characterized in that: step S2 comprises: S21: Slurry is uniformly mixed: the slurry is sent to the homogenization tank through a centrifugal pump, the slurry is mixed with the solid in the homogenization tank, and the uniformly mixed material is sent to the hydrolysis and desanding tank of the anaerobic digestion system; S22: Anaerobic digestion reaction: After the pretreated material meets the requirements of the anaerobic digestion system, it is first hydrolyzed and acidified in a hydrolysis and acidification tank. The acidified liquid after hydrolysis and acidification is sent to a fully mixed anaerobic digestion tank for digestion reaction. The digestate after the anaerobic digestion reaction overflows into the digestate storage tank for temporary storage to generate biogas, which is then treated. 3. A kitchen waste treatment process according to claim 2, characterized in that: said step S22 comprises Biogas treatment: The collected biogas is desulfurized and enters the biogas storage cabinet. The purified biogas is sent to the boiler system for combustion and utilization. It can be used to cook the slurry after impurities are removed. When the equipment fails or is under maintenance, the biogas can be sent to the torch for combustion. 4. A process for treating kitchen waste according to claim 1, characterized in that: the step S1 of treating the waste comprises: Extrusion treatment: pour the kitchen waste into the hopper of the designated receiving device, separate the liquid and solid waste in the kitchen waste through the hopper, store the leachate leached during the material transmission process in the slurry buffer tank, and the solid material transported to the high-pressure extruder is extruded by the extruder. The moisture in the material and the impurities with a particle size of less than 10mm pass through the filter holes and enter the buffer tank; The material in the buffer tank is diluted and prepared with the oil-water mixture in the leachate tank. The evenly mixed material is discharged through a screw pump and enters the impurity remover, which separates impurities with a particle size of more than 3mm in the material. 5. The process for treating kitchen waste according to claim 1, wherein the step S1 of treating the waste comprises: Crushing treatment: Pour the food waste into the receiving hopper of the designated receiving device, separate the liquid and solid waste in the food waste through the receiving hopper, store the leachate leached during the material transmission process in the slurry buffer tank, and the solid materials transported to the large material sorter are broken up by mechanical swing legs. The materials with a particle size greater than 50mm are transported to the vertical crusher through a screw conveyor for crushing, and the materials with a particle size less than 1cm are transported to the grit machine through a screw conveyor. The materials rotate slowly through the drum, and the effective slurry enters the slurry pool through the overflow port at the upper end of the grit machine, and then the debris is separated by the impurity remover. 6. A process for treating kitchen waste according to any one of claims 1 to 5, characterized in that: said step S1 comprises S12: Cooking slurry: The slurry after impurities removal enters the storage box for buffering, and then is pumped into the cooking tank by a centrifugal pump. During the pumping process, the slurry is heated by low-pressure steam to make the slurry temperature in the cooking tank reach 80°C, and then left to stand for 1-2 hours, so that the oil can be extracted more easily; S13: Separation of slurry: The slurry in the cooking tank enters the three-phase separator through a screw pump, and the three-phase separator separates the slurry into water phase, oil phase and solid phase. 7. A process for treating kitchen waste according to claim 2, characterized in that: in said step S22, a digestion reaction is carried out, a stirrer is provided on the top of the digestion reaction tank to ensure that the material in the tank is uniform, and the material liquid in the digestion reaction tank enters the mud-water heat exchanger through a centrifugal pump, and in the mud-water heat exchanger, the material and the circulating water are heat exchanged to adjust and control the temperature of the material in the anaerobic digestion tank. 8. A process for treating kitchen waste according to claim 3, characterized in that: a stirrer is provided at the bottom of the digestive liquid storage tank to regularly stir the digestive liquid to prevent the digestive liquid from settling. 9. A process for treating kitchen waste according to claim 2, characterized in that: in said step S21, the mixing and blending is carried out in a homogenizing tank, and the solid content of the slurry in the homogenizing tank is controlled to be about 8%±2. 10. A kitchen waste treatment process according to claim 1, characterized in that: in the step S6, the sewage is treated, the sewage enters the regulating tank and the accident tank, the water in the regulating tank and the accident tank first enters the hydrolysis acidification tank through the regulating tank lifting pump and the accident tank lifting pump, the water in the hydrolysis acidification tank overflows to the primary A, primary O, secondary A, secondary O and MBR membrane tank in sequence for treatment, the membrane group in the MBR membrane tank has the function of mud-water separation and interception through the suction action of the water production pump, and the intercepted sludge is returned to the primary A tank through the sludge return pump.