Organic waste anaerobic digestion treatment method

Abstract

The invention relates to an anaerobic digestion treatment method for organic garbages. The anaerobic digestion treatment method includes removing impurities such as large plastic bags and large metalware in kitchen garbages, lifting and dumping the kitchen garbages into a mechanical biochemical reaction to be subjected to hydrolytic acidification, discharging leaching residues through a residue outlet after squeezing and dewatering, feeding leaching liquid which is filtered roughly into a liquid groove and delivering the leaching liquid from a liquid outlet through a screw conveyor in the liquid groove, feeding the leaching liquid which is subjected to solid and liquid separation and filtering by a drum grill into an oil separating settling tank, enabling the leaching liquid which is subjected to oil and water separation to flow out of the oil separating settling tank, collecting oil and water mixed liquid by an oil collecting pipe and discharging the oil and water mixed liquid out of the settling tank, and lifting the oil-removed leaching liquid into an anaerobic reactor by a screw pump so as to carry out anaerobic digestion treatment. A part of outflow is used as spraying water, the other part of outflow is delivered by a drain pipe, and biogas generated is led into a gas pipe. The anaerobic digestion treatment method is reasonable in technology, capable of increasing hydrolysis and acidification efficiency of organic components and reducing content of residual organic components and low in treatment cost.

Description

technical field [0001] The invention relates to an anaerobic digestion treatment method of organic garbage, which belongs to the technical field of garbage treatment. Background technique [0002] Kitchen waste is the domestic waste formed by residents in the process of living consumption, which is easily rotten and deteriorated, emits foul smell, and spreads bacteria and viruses. At present, the main treatment technologies of food waste actually applied at home and abroad mainly include landfill, incineration, composting, physical crushing, feed and anaerobic digestion treatment technologies. [0003] (1) Landfill: High water content is not conducive to paving operations in landfill sites and increases the amount of leachate treatment. The development direction of landfill technology will be the final disposal site that mainly treats stabilized and inorganic waste. It is an inevitable trend for kitchen waste to enter the landfill. [0004] (2) Incineration: Kitchen waste ...

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Problems solved by technology

[0003] (1) Landfill: High water content is not conducive to paving operations in landfill sites and increases the amount of leachate treatment. The development direction of landfill technology will be the final disposal site that mainly treats stabilized and inorganic waste. It is an inevitable trend for kitchen waste to enter the landfill

[0004] (2) Incineration: Food waste has high moisture and oil content, and mixed incineration with domestic waste will greatly reduce the heat utilization efficiency of incineration, and lipids will also become dioxins under the conditions of heavy metal catalysis

In addition, oil and salt will affect microbial decomposition rate and compost quality

[0006] (4) Physical crushing method: This technology has the advantages of simple technology and low price, but it is not conducive to large-scale treatment, and it will increase the treatment load of sewage treatment plants

In addition, the rich nutrients in the kitchen waste are discharged into the sewer, which will cause a huge waste of resources

[0007] (5) Feed: Food waste without harmless treatment is used as feed to directly feed livestock. Toxins and harmful substances in livestock can be transmitted to humans through the food chain, and there are hidden dangers that are harmful to human health.

[0009] At present, the above-mentioned hydrolysis and acidification process requires beating, so separate beating equipment and hydrolysis acidification tank are required. On the one hand, the equipment used is more, the floor area is large, and the treatment time is long, especially the composition of kitchen waste is complex, and there are many problems. There are many inhibitory factors to the anaerobic digestion process, so it affects the biodegradation process, and there is a problem of low hydrolysis and acidification efficiency, which even leads to the failure of the biological system

Furthermore, the moisture content of the residue after anaerobic digestion reaches 80% after dehydration, resulting in unstable content of residual organic components.

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