Waste food waste slurry treatment method

Abstract

A waste and food waste slurry treatment method is an environment treatment technology, solves the problem of incomplete treatment of kitchen waste at present, and comprises the following steps: firstly, heating kitchen waste which is pretreated by a kitchen waste treatment plant and contains 60% of water, and controlling the water content of the heated and evaporated kitchen waste to be 8-12%; then carrying out high-temperature sterilization treatment on the heated and evaporated garbage, and carrying out sterilization treatment on blue ear germs, hog cholera germs and the like in the garbage at the high temperature of 100-300 DEG C, so that the blue ear germs, hog cholera germs and the like reach the national standard; some heavy metals such as arsenic, mercury, cadmium, lead and phosphorus are degraded at the temperature of 100-150 DEG C and reach the national standard.

Description

Technical Field

[0001] The invention relates to an environmental management technology, in particular to a method for treating waste food waste slurry. Background Art

[0002] Over the years, the pollution situation has become increasingly severe. Domestic sewage and garbage in cities and rural areas are one of the main sources of pollution, and a large part of urban sewage and garbage comes from sewage and garbage generated by the catering industry. The discharge of sewage that does not meet the standards will inevitably cause negative trophication, heavy metalization, poisoning and odorization of water quality. The catering industry waste generated every day is dirty and smelly, and contains a large number of pathogenic microorganisms. It not only seriously affects the urban environmental sanitation, but also causes many illegal and disorderly incidents due to the large-scale disposal of these wastes. Traditional treatment of catering waste: First, it is used illegally to feed livestock and produce "garbage pigs", etc., and second, it is used to refine "swill oil", which are very serious hazards. For a long time, due to the lack of standardized management and treatment of catering waste, as part of domestic waste, catering waste has not been effectively collected and managed. Most of them (such as sanitary chopsticks, bones, fish bones, vegetable roots, fruit peels, etc.) are dumped and placed randomly, seriously polluting the sanitary environment. If these pollutants are not effectively disposed of, they will pollute the environment around our city, thereby affecting the physical and mental health of the general public.

[0003] After searching, the patent application number is 201510381369.6, and its name is a method for pre-treatment of food waste. The food waste is unloaded from the transport vehicle into the disinfection pool, and the food waste is first disinfected by ozone disinfection to fully eliminate the bacteria in the food waste; (2) the disinfected food waste is separated into solid and liquid, and the solid waste is transported to the belt conveyor through a screw conveyor, and then crushed by a crusher, and the liquid waste is sent to the oil separator for oil-water separation; (3) the crushed solid waste is sent to a double-axis juicer for decomposition again, and the decomposed solid waste is sent to the processing department to be processed into solid fertilizer, and the liquid waste after grease removal is sent to the processing department to be processed into solid fertilizer, and the liquid waste after grease removal is processed into liquid fertilizer. The shortcoming of this technology is that the heavy metals are not treated, which makes the land compacted and the land grains are not harvested.

[0004] There is also a method and process for treating kitchen waste with a document serial number of 12873173 from the State Intellectual Property Office, which performs star-shaped sorting on the kitchen waste to sort out large pieces of materials larger than a preset size, then squeezes and dehydrates the sorted large pieces of materials, and transports the sorted other materials and liquids to a storage box for temporary storage; then transports the other materials and liquids in the storage box to a conveying tank through a spiral conveying mechanism; when the other materials and liquids in the conveying tank reach a preset height, an air compressor is used to transport them to a wet decomposition tank; After high-temperature wet decomposition treatment in a wet decomposition tank, the pressurized material is transported to a buffer tank; The material in the buffer tank is roughly squeezed and sorted at the same time. The sorted material is larger than the preset amount. This technology has low economic efficiency and is difficult to operate.

[0005] The technical number is 18170332, and a system for the coordinated incineration of kitchen waste and domestic waste is provided. The system for the coordinated incineration of kitchen waste and domestic waste comprises a kitchen waste collection tank, which is connected to a coarse screen via a pipeline; the coarse screen is connected to a coarse residue pipe and a discharge pipe, and the discharge pipe is connected to a crusher; the crusher is connected to a desander via a pipeline, and the desander is connected to a biogas generator via a pipeline; the biogas generator is connected to a biogas collection tank via a biogas pipe, and the biogas generator is connected to a centrifugal dehydrator via a residue pipe; a conveyor belt is provided at the bottom of the centrifugal dehydrator, and a drainage pipe is connected to the centrifugal dehydrator; a garbage incinerator is provided at one end of the conveyor belt, and a filtrate collection tank is provided at one end of the drainage pipe.

[0006] The above common garbage recycling and treatment systems usually recycle the grease in the kitchen waste to make chemical oil when treating kitchen waste, and sterilize the remaining materials in the kitchen waste before landfilling, which causes a lot of organic matter to be wasted, resulting in a low utilization rate of kitchen waste; when treating domestic garbage, the leachate is biochemically treated to make the leachate meet the wastewater discharge standard. This treatment method has a low treatment efficiency due to the slow biochemical reaction; when a large amount of leachate needs to be treated, a larger biochemical pool is required, which is costly; at the same time, the biological method does not completely treat the impurities in the leachate, resulting in a low utilization rate of the leachate; and the biochemical treatment of the leachate requires strict control of the leachate temperature and pH, which is more troublesome to operate. Therefore, the existing garbage recycling system has the problems of low garbage utilization rate, low treatment efficiency, high cost and more troublesome operation. The investment in this technology is too large, and the actual economic benefit gap is too large. Summary of the invention

[0007] The purpose of the present invention is to provide a method for treating waste food waste slurry with fine sorting and high utilization rate, which solves the problem of incomplete treatment of current food waste. The purpose of the present invention is achieved in that firstly, food waste containing 60% moisture after pretreatment in a food waste treatment plant is heated, and the moisture content of the food waste after heating and evaporation is controlled to be 8-12%; then the heated and evaporated waste material is sterilized at high temperature, and blue ear bacteria, swine fever bacteria and the like in the waste material are sterilized at a high temperature between 100 and 300 degrees to meet national standards; some heavy metals such as arsenic, mercury, cadmium, lead and phosphorus are degraded at a temperature of 100 to 150 degrees to meet national standards.

[0008] The specific method of the present invention is as follows: in the first step, the food waste containing 60% moisture after pretreatment in the food waste treatment plant is heated, and the food waste containing 60% moisture pretreated in the silo is transported to the feed inlet of the dryer through a belt conveyor for drying, and the moisture content of the heated food waste is controlled to be 8-12%.

[0009] In the second step, the food waste containing 8-12% moisture is put into the dryer again for high-temperature sterilization. The drying temperature is 100-300 degrees. The food waste is in block form in the dryer and is crushed.

[0010] The third step is to grind the bulk garbage into powder using a crusher, and remove the impurities with dust removal facilities at the same time.

[0011] The fourth step is to send the powdered concentrate after removing the impurities to the transfer yard through the finished product conveyor.

[0012] The fifth step is to granulate the powdered concentrate through a granulator, and then package it for sale.

[0013] The beneficial effects of the present invention are as follows: the resource utilization is maximized, the investment and floor space of the feed are small, the processing workshop environment is good, the processing cycle is short, and the operating cost is low; the quality indicators of the processed feed all meet the standards, which can effectively prevent the food waste from entering the hands of illegal vendors, and suppress unhealthy breeding and counterfeiting activities from the source; "gutter oil" and "garbage pigs" are eliminated, and harmful substances are prevented from entering the human food chain from the source, laying the foundation for ensuring food hygiene and safety and the health of citizens; the timely collection and transportation of food waste can improve the odor of the surrounding environment, effectively suppress the breeding of mosquitoes around garbage points, and provide citizens with a comfortable living environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a flow chart of the waste food waste slurry treatment technology, in which 1, silo 2, belt conveyor 3, burner 4, dryer 5, grinder 6, cyclone dust collector 7, induced draft fan 8, sedimentation chamber 9, finished product conveyor 10, transfer yard Figure 2 It is a stereoscopic diagram of a waste food waste slurry processing device, including 2, a belt conveyor 4, a dryer 5, a grinder 9, a finished product conveyor 10, and a transfer yard. DETAILED DESCRIPTION

[0015] Embodiment 1. The present invention first heats the pre-treated kitchen waste containing 60% moisture, and the moisture content of the kitchen waste after heating and evaporation is controlled to be 8-12%; then the heated and evaporated waste is sterilized at high temperature, and the blue ear bacteria, swine fever bacteria, etc. in the waste are sterilized at a high temperature between 100-300 degrees to meet the national standards; some heavy metals such as arsenic, mercury, cadmium, lead, and phosphorus are degraded at a temperature of 100-150 degrees to meet the national standards.

[0016] Example 2: After testing by a legal professional testing agency, the various physical and chemical index parameters of the feed manufactured above are: African swine fever virus nucleic acid, Ct value is negative; calcium, 1.36%; mercury, not detected; arsenic, 0.474mg / kg; phosphorus, 0.30%; crude ash, 12.6%; crude fiber, 6.8%; crude protein, 27.37%; lead, 4.66mg / kg; cadmium, not detected. All feeds meet the standards.

[0017] Embodiment 3, the process of the present invention is implemented by utilizing the following devices, which include a silo 1, a belt conveyor 2, a burner 3, a dryer 4, a grinder 5, a cyclone dust collector 6, an induced draft fan 7, a settling chamber 8, a finished product conveyor 9, and a transfer yard 10, wherein one end of the belt conveyor 2 is located in the silo 1, and the other end of the belt conveyor 2 is located above one end of the dryer 4, and the middle end of the belt conveyor 2 is heated by a heat source; the dryer 4 has a combustion chamber 3, and a pulverizer 5 is installed at the other end of the dryer 4, and a dust removal facility is connected to the top of the pulverizer 5, and a finished product conveyor 9 is connected to the bottom of the pulverizer 5, and the end of the finished product conveyor 9 is a transfer yard 10.

[0018] Embodiment 4: The dust removal facility comprises a cyclone dust collector 6, an induced draft fan 7, and a settling chamber 8. One end of the cyclone dust collector 6 is connected to the pulverizer 5, and the other end thereof is connected to the settling chamber 8. An induced draft fan 7 is installed at the middle end of the cyclone dust collector 6.

[0019] Example 5, application method of the present invention: In the first step, the food waste containing 60% moisture after pretreatment in the silo is transported to the dryer through a belt conveyor for drying. At this time, the moisture content of the heated food waste is controlled at 8-12%.

[0020] In the second step, the food waste containing 8-12% of moisture enters the dryer 4 again for high-temperature sterilization. The drying temperature is 100-300 degrees. The food waste is in block form in the dryer 4 and is crushed.

[0021] In the third step, the blocky garbage is ground with a crusher 5, and the dust removal facility removes the old impurities while grinding.

[0022] In the fourth step, the powdered concentrate after the impurities are removed is sent to the transfer yard 10 through the finished product conveyor 9.

[0023] The fifth step is to make the powdered concentrate into granules through a granulator, and then package the concentrate granules for sale.

Claims

1. A method for treating waste food waste slurry, characterized by: First, the pre-treated food waste containing 60% moisture is heated, and the moisture content of the food waste after heating and evaporation is 8-12%; then the heated and evaporated waste is sterilized at high temperature, and the blue ear bacteria, swine fever bacteria and other bacteria in the waste are sterilized by high temperatures between 100-300 degrees to meet national standards; some heavy metals such as arsenic, mercury, cadmium, lead and phosphorus are degraded at a temperature of 100-150 degrees to meet national standards.

2. The finished product after the method for treating waste food waste slurry according to claim 1 is characterized by: After testing by a legal professional testing agency, the physical and chemical parameters of the feeds manufactured above are: African swine fever virus nucleic acid, Ct values ​​are all negative; calcium, 1.36%; mercury, not detected; arsenic, 0.474mg / kg; phosphorus, 0.30%; crude ash, 12.6%; crude fiber, 6.8%; crude protein, 27.37%; lead, 4.66mg / kg; cadmium, not detected. All feeds meet the standards.

3. The device for treating waste food waste slurry according to claim 1 is characterized by: It includes a silo (1), a belt conveyor (2), a burner (3), a dryer (4), a grinding machine (5), a cyclone dust collector (6), an induced draft fan (7), a settling chamber (8), A finished product conveyor (9) and a transfer yard (10), wherein one end of the belt conveyor (2) is located in a silo (1), and the other end of the belt conveyor (2) is located above one end of a dryer (4), and the middle end of the belt conveyor (2) is heated by a heat source; a burner (3) is located in the dryer (4), and a grinding mill (5) is installed at the other end of the dryer (4); a dust removal facility is connected to the top of the grinding mill (5), and a finished product conveyor (9) is connected to the bottom of the grinding mill (5); and the end of the finished product conveyor (9) is a transfer yard (10); the dust removal facility comprises a cyclone dust collector (6), an induced draft fan (7), and a settling chamber (8); one end of the cyclone dust collector (6) is connected to the grinding mill (5), and the other end is connected to the settling chamber (8), and the middle end of the cyclone dust collector (6) is installed with an induced draft fan (7).

4. The method for treating waste food waste slurry according to claim 1, characterized in that: The food waste pre-treated in the silo (1) and containing 60% moisture is transported to the dryer (4) through the belt conveyor (2) for drying, and the moisture content of the food waste after heating is controlled at 8-12%; In the second step, the food waste containing 8-12% of water is put into the dryer (4) again for high-temperature sterilization treatment. The drying temperature is 100-300 degrees. The food waste is in a block shape in the dryer (4) and is crushed. The third step is to grind the blocky garbage into powder using a crusher (5), and remove the old impurities by dust removal equipment during grinding; The fourth step is to send the powdered concentrate after removing the old impurities to the transfer yard (10) through the finished product conveyor (9); The fifth step is to make the powdered concentrate into granules through a granulator, and then package the concentrate granules for sale.

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