CN116213403A

CN116213403A - Whole-process treatment system and method for insect belly-passing transformation of kitchen waste

Info

Publication number: CN116213403A
Application number: CN202211564561.5A
Authority: CN
Inventors: 张小赛; 刘杰; 朱菁; 王瑾瑾; 陈婷; 袁建海
Original assignee: Nanjing Wondux Environmental Protection Technology Co ltd
Current assignee: Nanjing Wondux Environmental Protection Technology Co ltd
Priority date: 2022-12-07
Filing date: 2022-12-07
Publication date: 2023-06-06

Abstract

The invention provides a full-flow treatment system and a full-flow treatment method for insect belly-passing transformation of kitchen waste, which realize full-quantization treatment of kitchen waste by pretreatment, biological belly-passing transformation, anaerobic treatment and biogas slurry treatment, and the recycling of the final product is as follows: insect proteins, organic fertilizers and reclaimed grease. No waste water is generated, and energy self-maintenance is realized; and part of the pretreated kitchen waste is eaten by black soldier fly larvae, protein and carbohydrate in the kitchen waste are decomposed by black soldier fly belly to synthesize new insect protein and fatty acid resources, and the discharged insect manure and larvae after the black soldier fly is eaten are screened and collected by a screening machine, so that the insect manure can be used as a high-quality bio-organic fertilizer after being treated. The water produced by pretreatment is subjected to anaerobic fermentation by an anaerobic unit, and methane produced by anaerobic digestion is subjected to desulfurization and purification treatment, so that heat can be supplied to produce steam for material heating and equipment heat preservation of the pretreatment unit. The dehydrated anaerobic biogas slurry is sent to a biogas slurry treatment unit for treatment, and the water quality reaches the standard and is discharged.

Description

Whole-process treatment system and method for insect belly-passing transformation of kitchen waste

Technical Field

The invention belongs to the technical field of environmental protection, and particularly relates to a process for carrying out full quantification, reduction and recycling treatment on organic garbage by utilizing insect belly crossing transformation.

Background

Kitchen waste is the most common waste produced in urban daily life, and mainly originates from catering service industry, families, enterprises and public institutions, etc. The garbage truck has the characteristics of high water content, high grease and salt content, easy rot and odor, and no contribution to the transportation of common garbage trucks. If the garbage is not treated by classification, the garbage can cause great harm to the environment. The sewage is discharged and poured into the sewer at will, so that the sewage is easy to cause coagulation and blockage, and a large amount of methane gas is generated by the coagulation and the blockage, so that the risk of bursting of the urban sewage pipe network is increased, and the treatment burden of a sewage treatment plant is increased. When mixed in common household garbage, the garbage leachate is greatly increased, so that the heat value of the garbage is reduced, and the generation of dioxin is promoted. Therefore, the kitchen waste treatment work is an urgent task.

The kitchen waste recycling and harmless treatment technology mainly comprises anaerobic fermentation, aerobic composting, incineration and the like. Because of the characteristic of the high water content of the kitchen waste, the kitchen waste is not suitable for being directly incinerated. The anaerobic fermentation process is suitable for treating kitchen waste with larger scale, and has larger investment and operation cost, less economic products, lower economy and incapability of forming scale advantages for treating kitchen waste with smaller scale. Aerobic composting has the advantages of simple operation and high recycling degree, but the existing composting process and technology are applied to the actual situation that the fertilizer product is unstable, the product sales are not clear, the running cost is high and the like.

The insect treatment technology is an artificial feeding technology of resource insects, and has the main value of efficiently treating organic solid waste, and finally realizing harmless treatment of the organic solid waste. Has the advantages of low investment, high kitchen waste treatment speed, small occupied area, high added value of products and the like. The treatment of kitchen waste by means of insect treatment technology has become a development direction.

However, the main disadvantages of the current processes using insect transformation technology are: the agricultural cultivation enterprises are mainly used, the scale is small, the problems of low equipment automation degree, poor system material connection, high utilization amount, poor three-waste treatment level and the like exist, and the development of a full-flow treatment system and a full-flow treatment process for treating kitchen waste by utilizing an insect belly-passing transformation technology are needed.

Disclosure of Invention

Aiming at the defects of the prior art, the invention provides a kitchen waste insect abdomen passing transformation full-flow treatment system and method, which can realize full quantification and recycling treatment of kitchen waste, and the recycling final product comprises: insect proteins, organic fertilizers and reclaimed grease. The sewage and wastewater generated by the process is treated, and can be directly discharged into a sewage treatment plant for further treatment, no wastewater is generated, and the whole process can realize energy self-maintenance without providing additional heat source.

The invention relates to a full-flow treatment system for kitchen waste insect belly-passing conversion, which comprises a pretreatment unit, a biological belly-passing conversion unit, an anaerobic unit and a biogas slurry treatment unit.

The pretreatment unit is used for separating organic components and inorganic impurities from the kitchen waste, preparing the organic impurities into organic kitchen slurry, and separating the organic kitchen slurry into grease, a water phase and a slag phase, wherein the slag phase and part of the water phase enter the biological abdomen passing conversion unit, and are subjected to insect abdomen decomposition in the biological abdomen passing conversion unit; the insect is a black soldier fly larva, protein and carbohydrate in kitchen waste are decomposed by the abdomen of the black soldier fly larva, new insect protein and fatty acid resources are synthesized, and the discharged insect manure and larva after the black soldier fly larva is eaten are screened and collected by a screening machine, so that the insect manure can be used as a high-quality bio-organic fertilizer after being treated.

The other part of water phase enters an anaerobic unit for anaerobic fermentation to generate biogas and anaerobic biogas slurry, the anaerobic biogas slurry is dehydrated and then is sent to a biogas slurry treatment unit for treatment, and the water quality reaches the standard and is discharged; after the marsh gas is desulfurized and purified, part of marsh gas is heated to produce steam for heating materials in the pretreatment unit and preserving heat of equipment.

Further, the biological belly passing conversion unit comprises a culture mixer, intelligent control culture equipment, a screening machine, intelligent fermentation equipment, a dryer and commodity insect refrigeration equipment;

the culture mixer is used for mixing the culture auxiliary materials with the slag phase and part of the water phase separated by the pretreatment unit to form organic mixed slurry, the mixing water proportion is adjusted by combining the culture scale and the project actual condition, and the adjustable range of the proportion of the water phase discharged by the pretreatment unit to enter the mixer is 0% -100%. The solid content of the discharged material of the mixer is 20-30%. The culture mixer is provided with a liquid level device, and the bottom of the culture mixer is conveyed by a screw to convey the mixed slurry to intelligent control culture equipment;

the intelligent control cultivation equipment comprises a cultivation box, and is used for arranging the organic mixed slurry in the cultivation box, inoculating larvae into the cultivation box, performing bioconversion on the organic mixed slurry through biological feeding and growth metabolism, and enabling the material after bioconversion to enter a screening machine;

the screening machine is used for separating the insect manure, the fresh insects and the residual impurities; the screening machine is provided with two layers of screens;

the intelligent fermentation equipment is used for fermenting and decomposing the insect manure separated by the screening machine to form an organic fertilizer product; the intelligent fermentation equipment is of a vertical bin type structure.

The dryer is used for drying the fresh insects separated by the screening machine, and storing the dried fresh insects in the commodity insect refrigerating equipment.

Further, the biological trans-abdominal transformation unit further comprises hatching equipment for hatching larvae.

Further, the intelligent control breeding equipment also comprises a unstacking machine, a chain conveyor, a turnover unloading machine, a distributing machine, a worm distributing machine, a stacking machine and conveying equipment;

the chain conveyor conveys the empty cultivating boxes to a distributing station, organic mixed slurry is uniformly distributed in the cultivating boxes through the distributing machine, the cultivating boxes with the distributed materials are conveyed to a worm distributing station through the chain conveyor, and larvae are uniformly distributed in the cultivating boxes; the biotransformation of the organic slurry is carried out in the cultivation boxes, the destacking machine stacks the cultivation boxes with the materials and the larvae together to form a chopper, after the cultivation is completed, the stack is sent to a destacking station by a conveying device, the cultivation boxes on the stack are taken down by the destacking machine and are sent to a chain conveyor, the chain conveyor drives the cultivation boxes to be sent to a turnover station, the turnover machine turns over the cultivation boxes, the materials in the cultivation boxes are all unloaded, and the materials fall onto a belt and are sent to a screening machine; and the chain conveyor returns the empty culture box to the distribution station, and the procedure is repeated.

Further, unstacking machine, chain conveyor, upset tripper, cloth machine, cloth worm machine, stacker, conveying equipment all integrate in airtight environment, are provided with automatic temperature and humidity control system and negative pressure exhaust system in the environment.

Further, the pretreatment unit comprises a receiving hopper, a screw conveyor, a hydraulic pulping machine, a low-level water tank, an extruder, a sand removing machine, a heating tank and a three-phase centrifuge.

The receiving hopper realizes the functions of receiving and conveying kitchen wastes and has a certain storage function;

the bottom of the receiving hopper and the bottom of the screw conveyor are provided with water filtering holes, the raw kitchen waste is discharged into the receiving hopper and is conveyed to the hydraulic pulping machine by the screw conveyor, and kitchen waste leachate is timely discharged to a low-level water pool in the conveying process.

The hydraulic pulping machine is used for removing impurities which are mixed in kitchen waste and cannot be converted by organisms. The hydraulic pulping machine is used for selectively crushing the materials, separating organic components and inorganic impurities, and preparing the organic components into kitchen slurry; inorganic impurities are discharged through a slag hole of the hydraulic pulping machine and reach an extruder to be squeezed and separated; the organic components reach the low-level water tank through the slurry outlet of the hydraulic slurry making machine;

the slurry obtained by squeezing and separating the inorganic impurities by the extruder is also sent to a low-level water tank; and a slag discharging screw is arranged below a slag outlet of the extruder and used for conveying inorganic impurities.

The desanding machine separates heavy substances in the kitchen slurry through hydrocyclone. The solid content of the feed of the sand remover is not more than 15%, and the heavy matters removed by the sand remover mainly refer to shells, glass, ceramic chips, sand and the like with specific weights of more than 2000kg/m ³ Is a mixture of impurities; the slurry in the low-level water tank enters a heating tank for steaming and heat preservation after being desanding by a desanding machine, so that most of grease in the kitchen slurry is converted into floatable oil. The temperature of the cooking is controlled between 80 and 90 ℃. The heating tank is heated by steam generated by the boiler after purifying methane generated by the anaerobic unit. And then enters a three-phase centrifuge to separate the slurry into grease, a water phase and a slag phase. The oil content of the grease is more than or equal to 95 percent, and the oil content of the water phase is less than or equal to 5 percent.

Further, the pretreatment unit also comprises a carbon source temporary storage pool, a grease temporary storage tank and a slag box;

temporarily storing the separated water phase into a carbon source temporary storage pool; the carbon source temporary storage tank is connected with the cooling water tower, and the water phase temperature in the carbon source temporary storage tank is reduced in a cooling water circulation mode.

The separated slag is temporarily stored in a slag box.

The separated grease temporary storage phase is sent to a grease temporary storage tank, and can be further precipitated and separated.

Further, the anaerobic unit comprises an anaerobic digestion tank, a spiral shell overlapping dehydrator, a gas holder, a methane filter, a desulfurizing tower, a methane boiler and a torch.

The anaerobic digestion tank adopts a complete mixing center top stirring structure and is used for degrading and converting the water phase discharge of the three-phase centrifugal machine into biogas. The adjustable range of the ratio of the water phase discharged material of the three-phase centrifugal machine to enter the anaerobic digestion tank is 0-100%. The fermentation temperature in the anaerobic digestion tank is controlled at 37+/-2 ℃.

The anaerobic digestion tank is connected with a gas holder through a methane pipeline, and the gas holder consists of an outer membrane, an inner membrane and a bottom membrane. The inflatable outer membrane forms a protective shell, the outer membrane bears pressure and keeps rigidity, and the inner membrane is used for storing methane and automatically contracts and expands according to the gas storage quantity; the basement membrane is paved on the civil engineering foundation, so that the biogas is completely sealed between the inner membrane and the basement membrane.

The gas holder is connected with the desulfurizing tower and the biogas filter through biogas pipelines, and the desulfurizing tower and the biogas filter are used for purifying biogas, so that the treated biogas meets the requirement of the boiler on inlet gas source conditions.

The biogas boiler is connected with the biogas filter through a biogas pipeline and is used for combusting biogas to generate steam, and the steam generated by the biogas boiler is used for heating materials of the pretreatment unit and preserving heat of equipment.

The torch is used for burning the redundant biogas in the maintenance period or emergency of the related biogas utilization equipment.

The anaerobic digestion tank is connected with the lap-screw dehydrator through a pipeline, and biogas residue liquid generated by the anaerobic digestion tank is separated through the lap-screw dehydrator.

The biogas slurry treatment unit comprises an MBR biochemical complete system, an MBR ultrafiltration complete system and a Fenton treatment complete system.

Biogas slurry separated by the spiral shell overlapping dehydrator is conveyed to a biogas slurry treatment unit through a pipeline, and standard treatment of the biogas slurry is achieved through an MBR biochemical complete system, an MBR ultrafiltration complete system and a Fenton treatment complete system which are sequentially connected.

The invention discloses a full-flow treatment method for food waste insect belly-passing transformation, which comprises the following steps:

step 1, preprocessing kitchen waste: sorting organic components and inorganic impurities from the kitchen waste, preparing organic components into organic kitchen slurry, and separating the organic kitchen slurry into grease, a water phase and a slag phase; the method comprises the following steps:

the kitchen waste is discharged into the receiving hopper, the material is conveyed to the hydraulic pulping machine by using the double-screw conveyor, the inside of the hydraulic pulping machine is provided with paddles with special structures, the paddles drive the material to do rotational flow through high-speed rotation, the selective crushing of the material is realized, and meanwhile, the organic components and the inorganic impurities are separated. The organic slurry is discharged to a low-level water tank, and the material containing inorganic impurities reaches a squeezer to squeeze and separate the inorganic impurities and is transported to the outside for disposal.

The organic slurry is converged with percolate leached from a front end hopper and a screw conveyor in a low-level water tank and then pumped to a desanding machine, and specific gravity of shells, glass, ceramic chips, sand and the like in the organic slurry is greater than 2000kg/m ³ Is a component of the catalyst. The sand-removed material is subjected to impurity removal treatment by an impurity remover, the removed impurities are transported to be burnt, and the slurry enters a heating tank.

Heating the slurry in the heating tank by steam, fully staying and preserving heat, delivering to a three-phase centrifuge for oil extraction, further settling and dehydrating the extracted crude oil, selling, mixing the separated solid slag with part of three-phase effluent in a culture mixer, and delivering to a biological belly passing conversion unit;

step 2, mixing the breeding auxiliary materials, the slag phase and part of water phase to form organic mixed slurry, and performing biological abdominal transformation decomposition on the organic mixed slurry through biological feeding and growth metabolism; the other part of water phase enters an anaerobic unit for anaerobic fermentation to generate biogas; the method specifically comprises the following steps:

step 2.1, mixing the breeding auxiliary materials, the slag phase and part of water phase to form organic mixed slurry;

the pretreated solid phase and part of the water phase enter a mixing and stirring bin through a slurry pump, and the mixing and stirring bin is provided with a weighing sensor and a water content measuring instrument serving as auxiliary material adding signal detecting instruments; the belt conveyor conveys auxiliary materials to an auxiliary bin, the auxiliary bin adds bran powder or straw powder and other auxiliary materials to the mixing and stirring bin through the screw conveyor, and the slurry is mixed into mixed slurry suitable for black soldier fly cultivation through stirring to serve as feed;

step 2.2, performing biological abdominal transformation decomposition on the organic mixed slurry through biological feeding and growth metabolism, wherein the method specifically comprises the following steps:

a multi-layer multi-row cultivation bed frame is arranged in an automatic cultivation workshop, mixed slurry is pumped to a distributing machine through a conveying pump, and the distributing machine is also provided with a weighing sensor as a feeding signal for detection. The distributing machine selects the distributing layer position on the cultivating bed frame through the lifting platform, the distributing machine enters the cultivating bed, and under the action of the poking device and the pushing device, materials are arranged on the cultivating box for larva feeding.

The system can automatically set the distribution mode, can realize automatic distribution, can realize small batch multi-frequency distribution throughout the day, and has higher culture efficiency. After 7d of cultivation, larva collection is realized by controlling the turnover of the cultivation box. One general cultivation cycle is: the larvae in the hatching workshop are preferentially sent to an automatic distributing machine for distributing insects, and then distributed and cultivated through the distributing machine every 1-2 h.

A large amount of beneficial bacteria are cultured in the feeding process of the hermetia illucens, and under the combined action of continuous peristaltic heat generation of larvae and microbial fermentation, a large amount of heat is emitted in the feeding process, so that water is continuously evaporated outwards, and the wastewater production is reduced; the negative pressure deodorization system, the full-automatic temperature and humidity control system and the ventilation system are arranged in the cultivation workshop, and the negative pressure fan collects and discharges odor emitted in the workshop into the odor treatment system for treatment and is discharged after reaching the standard.

Through feeding and ingestion for 7 days, most of mixed slurry in a cultivation bed frame is decomposed and consumed, the substances in a cultivation box are a mixture of inorganic impurities, larvae and worm manure, the cultivation box mixture is overturned and unloaded through a unloader, the mixture enters a screening machine through a belt conveyor to be screened, the screened larvae are dried into dried adults through a dryer, the dried adults are sent into a commodity worm refrigerating device to be stored until sold, the screened worm manure enters a composting workshop to be processed into biological bacterial manure through a vertical intelligent fermentation device, and the screened impurities are uniformly collected and treated by an external transportation landfill;

step 3, anaerobic fermentation

Anaerobic adopts a moderate temperature wet anaerobic process, the pretreated kitchen slurry enters a homogenizing tank after being regulated to a proper temperature by a heat exchanger, and the organic slurry is rapidly hydrolyzed into organic acid in the tank, so that a large amount of fermentable substances are accumulated in a methane production stage. The hydrolyzed kitchen slurry is pumped into the anaerobic digestion tank, and meanwhile, part of the slurry is heated by a heat exchanger, so that the slurry in the anaerobic tank can be quickly heated and maintained. Under the action of an anaerobic tank stirrer, slurry is homogenized for anaerobic fermentation, and after the biogas generated by anaerobic digestion is subjected to desulfurization and purification treatment, part of the biogas is subjected to heat supply to produce steam for heating materials of a pretreatment unit and preserving heat of equipment.

Step 4, biogas slurry treatment

The dehydrated anaerobic biogas slurry is sent to an air floatation complete set of equipment of a sewage treatment system for pretreatment, and the pretreated biogas slurry is sent to a biochemical system and subsequent ultrafiltration equipment. The ultrafiltration effluent treated by the external membrane biochemical reactor can reach the discharge standard under the normal operation condition, and enters an advanced treatment system for emergency treatment when the effluent exceeds the standard. The advanced treatment system consists of a Fenton system and a biological filter system. After the COD in the MBR produced water is further removed by the Fenton system, the wastewater enters the biological filter to further remove the total nitrogen and the COD in the wastewater, so that the effluent is ensured to reach the standard.

The invention has the beneficial effects that: compared with the prior art, the invention provides a kitchen waste insect abdomen passing transformation full-flow treatment system and method, which can realize full quantification and recycling treatment of kitchen waste, and the recycling final product comprises the following components: insect proteins, organic fertilizers and reclaimed grease. No waste water is generated, and the whole process can realize energy self-maintenance without providing steam additionally. Has the advantages of low investment, high kitchen waste treatment speed, small occupied area, high added value of products and the like. The equipment has high automation degree, good system material connection, less labor consumption and high three-waste treatment level.

The features and advantages of the present invention are illustrated in detail by way of example in the accompanying drawings.

Drawings

FIG. 1 is a flow chart of the process of the present invention;

FIG. 2 is a flow chart of the pretreatment unit process of the present invention;

FIG. 3 is a flow chart of the process of the insect belly-passing transformation unit of the invention;

FIG. 4 is a process flow diagram of an anaerobic system according to the present invention;

FIG. 5 is a process flow diagram of the wastewater treatment system of the present invention.

Detailed Description

The present disclosure will now be described more fully hereinafter with reference to the accompanying drawings, in which some, but not all embodiments of the invention are shown, and in which all other embodiments of the invention are shown, so that those skilled in the art may make no inventive effort.

Examples

In a certain kitchen waste treatment project, the treatment scale is 50 tons/day, and a process of pretreatment, hermetia illucens passing abdominal biotransformation, anaerobism and biogas slurry treatment is adopted as shown in figure 1, wherein the pretreatment adopts a process of hydraulic pulping, sand removal, impurity removal and grease separation, the anaerobism adopts a medium-temperature CSTR process, and the biogas slurry treatment adopts a process of pretreatment, biochemical MBR and nanofiltration. The whole process recycling product mainly comprises the following components: crude oil, hermetia illucens fresh insects and organic fertilizer. The specific process flow is as follows:

(1) Kitchen waste pretreatment

As shown in fig. 2, the kitchen waste collection and transportation vehicle discharges kitchen waste into a receiving hopper in a pretreatment workshop, a double-screw conveyor is used for conveying materials to a hydraulic pulping machine, paddles with special structures are arranged in the hydraulic pulping machine, and the paddles drive the materials to perform rotational flow through high-speed rotation, so that the materials are selectively crushed, and meanwhile, organic components and inorganic impurities can be separated. The organic slurry is discharged to a low-level water tank, and the material containing inorganic impurities is sent to an extruder for squeezing and separating the inorganic impurities and is transported to the outside for disposal.

The prepared organic slurry and percolate at the front end are converged in a low-level water tank and then pumped to a desanding machine, and shells, glass, ceramic chips, sand and the like in the organic slurry are removed, wherein the specific gravity of the shells, the glass, the ceramic chips, the sand and the like is more than 2000kg/m ³ Is a component of the catalyst. The sand-removed material is subjected to impurity removal treatment by an impurity remover, the removed impurities are transported to be burnt, and the slurry enters a slurry temporary storage tank.

Heating the kitchen slurry after impurity removal to a proper temperature by steam, fully staying in a heating tank for heat preservation, and delivering to a three-phase centrifuge for oil extraction, wherein the steam demand is about 6.72t/d. The extracted crude grease is about 3t/d, the crude grease is further settled and dehydrated and then is sold, the separated solid slag is 7.98t/d, the separated three-phase effluent is 63.49t/d,20% of the three-phase effluent is mixed by a mixer and then is sent to a black soldier fly conversion system for subsequent treatment, and the remaining 80% of the three-phase effluent is sent to an anaerobic system.

(2) Mixing and stirring

As shown in fig. 3, the pretreated solid phase and part of the water phase enter a mixing and stirring bin through a slurry pump, and the mixing and stirring bin is provided with a weighing sensor and a water content measuring instrument as auxiliary material adding signal detecting instruments; the belt conveyor conveys auxiliary materials to the auxiliary material bin, the auxiliary material bin adds the auxiliary materials such as bran powder or straw powder to the mixing and stirring bin through the screw conveyor, the slurry is proportioned into feed suitable for black soldier fly cultivation through stirring, and the feed is added into the distributing machine through the screw conveyor. The mixer mixes 7.98t/d three-phase slag, 13.33 three-phase effluent and 4.10t/d auxiliary materials, and finally the feeding material into the culture unit is 25.41t/d.

(3) Commercial insect breeding

A multi-layer multi-row cultivation bed frame is arranged in an automatic cultivation workshop, kitchen waste slurry is conveyed to a storage box of a distributing machine through a conveying pump, and the distributing machine is also provided with a weighing sensor as a feeding signal for detection. The distributing machine selects a distributing layer position through the lifting platform, the trolley enters the breeding bed, and materials are arranged on the filter cloth for larva feeding under the action of the material shifter and the material pusher. The system can automatically set the distribution mode, can realize automatic distribution, can realize small batch multi-frequency distribution throughout the day, and has higher culture efficiency. The inoculum size of the ova was about 2.54kg/d. After 7d of cultivation, larva collection is realized by controlling the retraction of cultivation filter cloth. And (5) flushing the filter cloth through a filter cloth flushing system, and then entering the next cultivation cycle. One general cultivation cycle is: the larvae and the nutrients in the hatching workshop are preferentially sent to the distributing trolley for distributing insects, and then the larvae and the nutrients are distributed and cultivated through the distributing trolley every 1-2 h.

A large amount of beneficial bacteria are cultured in the feeding process of the hermetia illucens, and under the combined action of continuous peristaltic heat generation of larvae and microbial fermentation, a large amount of heat is emitted in the feeding process, so that water is continuously evaporated outwards, and the wastewater production is reduced; the negative pressure deodorization system, the full-automatic temperature control system and the ventilation system are arranged in the cultivation workshop, and the negative pressure fan collects and discharges odor emitted in the workshop into the odor treatment system for treatment and is discharged after reaching the standard.

(4) Harvesting and separating unit

Through feeding and ingestion for 7 days, most of kitchen waste in a cultivation tray frame is decomposed and consumed, substances in the cultivation tray become a mixture of kitchen waste food residues, larvae and insect manure, the mixture in the cultivation tray is overturned and poured into a discharge hopper through a discharge machine to enter a probability screening machine for screening treatment through a belt conveyor, the screened larvae enter a refrigeration house for inactivation and storage until being sold, the screened insect manure enters a composting workshop to be processed into biological bacterial manure through an aerobic composting machine, and the screened impurities are uniformly collected and treated by an external transport landfill. The final fresh insect product is about 5t/d, and the organic fertilizer product is about 5t/d.

(5) Anaerobic unit

As shown in FIG. 4, the anaerobic unit was fed in an amount of about 33.61t/d, TS8%. Anaerobic adopts a moderate temperature wet anaerobic process, the pretreated kitchen slurry enters a homogenizing tank after being heated by a heat exchanger, and the organic slurry is rapidly hydrolyzed into organic acid in the tank, so that a large amount of fermentable substances are accumulated in the methane production stage. The hydrolyzed kitchen slurry is pumped into the anaerobic digestion tank, and meanwhile, part of the slurry is heated by a heat exchanger, so that the slurry in the anaerobic tank can be quickly heated and maintained. Under the action of an anaerobic tank stirrer, slurry is homogenized for anaerobic fermentation, after the biogas generated by anaerobic digestion is subjected to desulfurization and purification treatment, heat is supplied to produce steam, the steam quantity is about 10.5t/d, and the steam quantity is greater than the steam quantity requirement of a pretreatment system, so that the self-sustaining of energy is realized, and no additional heat source is required.

(6) Biogas slurry treatment

As shown in FIG. 5, the dehydrated anaerobic biogas slurry is about 32.5t/d, all the anaerobic biogas slurry is pumped to a biogas slurry treatment system, is pretreated by an air floatation complete equipment, and is sent to a biochemical system and a subsequent ultrafiltration device. The ultrafiltration effluent treated by the external membrane biochemical reactor can reach the standard and be discharged under the normal running condition.

The embodiment can realize the full quantification and the recycling treatment of the kitchen waste, and the recycling final products are as follows: insect proteins, organic fertilizers and reclaimed grease. No waste water is generated, and the whole process can realize energy self-maintenance without providing steam additionally. Has the advantages of low investment, high kitchen waste treatment speed, small occupied area, high added value of products and the like. The equipment has high automation degree, good system material connection, less labor consumption and high three-waste treatment level.

Claims

1. The full-flow treatment system for the insect belly-passing transformation of the kitchen waste is characterized by comprising a pretreatment unit, a biological belly-passing transformation unit, an anaerobic unit and a biogas slurry treatment unit;

the pretreatment unit is used for separating organic components and inorganic impurities from the kitchen waste, preparing the organic components into organic kitchen slurry, and then separating the organic kitchen slurry into grease, a water phase and a slag phase, wherein the slag phase and part of the water phase enter the biological belly passing conversion unit, and are subjected to belly decomposition by insects in the biological belly passing conversion unit;

and the other part of water phase enters an anaerobic unit for anaerobic fermentation to generate methane and anaerobic methane liquid, and the anaerobic methane liquid is dehydrated and then is sent to a methane liquid treatment unit for treatment.

2. The full-flow treatment system for the transformation of kitchen waste insects through abdomen according to claim 1, wherein the biological abdomen-passing transformation unit comprises a cultivation mixer, an intelligent cultivation device, a screening machine, an intelligent fermentation device, a dryer and a commodity insect refrigerating device;

the culture mixer is used for mixing the culture auxiliary materials with the slag phase and part of water phase separated by the pretreatment unit to form organic mixed slurry, and sending the organic mixed slurry to intelligent control culture equipment;

the intelligent control cultivation equipment comprises a cultivation box, and is used for arranging the organic mixed slurry in the cultivation box, inoculating larvae into the cultivation box, performing bioconversion on the organic slurry mixture through biological feeding and growth metabolism, and enabling the material after bioconversion to enter a screening machine;

the screening machine is used for separating the insect manure, the fresh insects and the residual impurities;

the intelligent fermentation equipment is used for fermenting and decomposing the insect manure separated by the screening machine to form an organic fertilizer product;

3. The full-process treatment system for the transformation of kitchen waste insects through abdomen according to claim 2, wherein the biological through abdomen transformation unit further comprises hatching equipment for hatching larvae.

4. The full-flow treatment system for the belly-passing transformation of kitchen waste insects according to claim 2, wherein the intelligent control cultivation equipment further comprises an automatic unstacker, a chain conveyor, an automatic overturning unloader, an automatic distributing machine, an automatic insect distributing machine, a stacker and an automatic conveying equipment;

the chain conveyor conveys the empty cultivating boxes to a distributing station, organic mixed slurry is uniformly distributed in the cultivating boxes through the automatic distributing machine, the cultivating boxes with the distributed materials are conveyed to a worm distributing station through the chain conveyor, and larvae are uniformly distributed in the cultivating boxes; the biotransformation of the organic slurry is carried out in the cultivation boxes, the cultivation boxes with the slurry and the larvae are piled together by the automatic unstacker to form a pair, when cultivation is completed, the cultivation boxes are piled and sent to an unstacking station, the cultivation boxes on the pile are automatically taken down by the automatic unstacker and sent to a chain conveyor, the cultivation boxes are driven by the chain conveyor to be sent to an automatic overturning station, the cultivation boxes are overturned by the automatic overturning machine, all the materials in the cultivation boxes are unloaded, and the materials are sent to the screening machine; and the chain conveyor returns the empty culture box to the distribution station, and the procedure is repeated.

5. The full-flow treatment system for the insect belly-passing transformation of kitchen waste according to claim 4, wherein the automatic unstacker, the chain conveyor, the automatic overturning unloader, the automatic distributing machine, the automatic insect distributing machine, the stacker and the automatic conveying equipment are integrated in a closed environment; an automatic temperature and humidity control system and a negative pressure exhaust system are arranged in the environment.

6. The full-flow treatment system for the insect belly-passing transformation of kitchen waste according to claim 1, wherein the pretreatment unit comprises a receiving hopper, a screw conveyor, a hydraulic pulping machine, a low-level water tank, an extruder, a sand removing machine, a heating tank and a three-phase centrifuge;

the raw kitchen waste is discharged into a receiving hopper, and the kitchen waste in the receiving hopper is conveyed to a hydraulic pulping machine by a screw conveyor; the bottoms of the receiving hopper and the screw conveyor are provided with water filtering holes, so that kitchen waste leachate in the conveying process can be timely discharged to a low-level water tank;

the hydraulic pulping machine is used for crushing materials, separating organic components and inorganic impurities, and preparing the organic components into kitchen slurry; inorganic impurities are discharged through a slag hole of the hydraulic pulping machine and reach an extruder to be squeezed and separated; the organic slurry reaches a low-level water tank through a slurry outlet of the hydraulic pulping machine;

the slurry obtained by squeezing and separating the inorganic impurities by the extruder is also sent to a low-level water tank;

the slurry in the low-level water tank enters a heating tank after being desanding by a desanding machine, most of grease is converted into floatable oil, and then enters a three-phase centrifuge to separate the slurry into grease, a water phase and a slag phase.

7. The full-flow treatment system for insect belly-through conversion of kitchen waste according to claim 1, wherein the pretreatment unit further comprises a carbon source temporary storage tank, a grease temporary storage tank and a slag box;

temporarily storing the separated water phase into a carbon source temporary storage pool;

temporarily storing the separated slag phase into a slag box;

the separated grease phase is temporarily stored in a grease temporary storage tank, and can be further precipitated and separated.

8. The full-flow treatment system for insect belly-through conversion of kitchen waste according to claim 1, wherein the carbon source temporary storage tank is connected with the cooling water tower, and the water phase temperature in the carbon source temporary storage tank is reduced in a cooling water circulation mode.

9. The full-flow treatment system for insect belly-through conversion of kitchen waste according to claim 6, wherein the heat source of the heating tank is steam generated by purifying biogas generated by the anaerobic unit and then sending the purified biogas to the boiler.

10. The full-flow treatment method for the insect belly-passing transformation of the kitchen waste is characterized by comprising the following steps of:

step 1, preprocessing kitchen waste

Sorting organic components and inorganic impurities from the kitchen waste, preparing organic components into organic kitchen slurry, and separating the organic kitchen slurry into grease, a water phase and a slag phase;

step 2, mixing the breeding auxiliary materials, the slag phase and part of water phase to form organic mixed slurry, and performing biological abdominal transformation decomposition on the organic mixed slurry through biological feeding and growth metabolism;

and the other part of water phase enters an anaerobic unit for anaerobic fermentation to generate biogas.