Anaerobic treatment method of kitchen garbage

Abstract

The invention discloses an anaerobic treatment method of kitchen garbage. The anaerobic treatment method comprises the following steps of: mixing the to-be-treated kitchen garbage to dense slurry; and then anaerobically treating the dense slurry to obtain biogas liquid, biogas and sludge, thereby realizing the treatment on the kitchen garbage, wherein the total solid content in the dense slurry is 15%-20%. The anaerobic treatment method is simple in process, easy to control and low in treatment expense. A semi-solid dense slurry anaerobic technology (the total solid content is kept at 15-20%) is adopted, devices needed in conveying and digestion steps are simple and are easy to debug, the technology is stable, the biogas production efficiency is high and the standing time is short. The project scale adaptability is wide and unit equipment modularization is achieved.

Description

technical field [0001] The invention relates to an anaerobic treatment method for kitchen waste. Background technique [0002] Kitchen waste is an important part of domestic waste, and it is a kind of solid waste formed by residents in the process of daily consumption. Kitchen waste mainly includes two parts: one is the waste generated in the process of kitchen food processing; the other is the leftover food on the table (excluding swill). Kitchen waste has a high water content, high fluidity, and is easy to leak, causing secondary pollution, polluting surface water and groundwater; kitchen waste will produce NH during the decomposition process of microorganisms 3 、H 2 S and harmful hydrocarbon gases have obvious stench and toxicity, directly endanger the human body, and produce a large number of mosquitoes and flies, affecting environmental sanitation; there may be viruses, pathogenic bacteria and pathogenic microorganisms in kitchen waste, if not Proper treatment and di...

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Problems solved by technology

[0003] The use of anaerobic digestion technology to treat kitchen waste is developing rapidly in foreign countries. The research and application of anaerobic digestion of kitchen waste in China is still in its infancy. According to the difference in solid content in the fermentation slurry, it can be divided into dry anaerobic digestion (solid content of 20% to 35%) and wet anaerobic digestion (solid content below 15%), in which the dry anaerobic digestion process relies too much on the reliability of the sorting system, and its sorting system is more complicated and difficult to control. Poor, due to the high solid content in the slurry, anaerobic acidification is easy to occur, the equipment is easy to block, the mixing is difficult, the energy consumption is high, the equipment debugging is difficult, the process stability is poor, the failure rate is high, the follow-up treatment is complicated, and there is no Harmification and reduction are not complete, secondary pollution control is difficult, and the reactor and related equipment of the wet anaerobic digestion process are large in size and sensitive to impact loads. Due to the high solid content in the slurry, it needs to be diluted with water. The consumption is large, and the amount of waste water is also large

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