Treatment system and method for biogas slurry produced from anaerobic fermentation of kitchen waste

Abstract

The invention discloses a treatment system and method for biogas slurry produced from anaerobic fermentation of kitchen waste. The system comprises a filtering and adjusting treatment unit, a coagulating sedimentation treatment unit, an anaerobic treatment unit, a primary nitrification and denitrification treatment unit, a secondary sedimentation tank, a Fenton oxidation treatment unit, a secondarynitrification and denitrification treatment unit, a membrane bioreactor filtration treatment unit, a membrane filtration treatment unit and a sludge treatment unit. The method comprises the main following steps: (1), hydraulic screen sieving and water quality and quantity adjustment; (2), coagulating sedimentation treatment; (3), anaerobic treatment; (4), primary nitrification and denitrification treatment; (5), Fenton oxidation treatment; (6), secondarynitrification and denitrification treatment; (7), membrane bioreactor filtration treatment and (8), membrane filtration treatment. The treatment method is resistant to impact load, the system operates stably, the treatment effect is good, pollutant discharge is greatly reduced, and the method has broad applicationprospect.

Description

technical field [0001] The invention relates to the field of garbage treatment, in particular to a treatment system and method for anaerobic fermentation biogas slurry of kitchen waste. Background technique [0002] With the improvement of people's living standards in our country and the rapid development of the urban catering industry, the amount of kitchen waste generated has also increased significantly. In 2013, the amount of kitchen waste generated in my country has far exceeded 60 million tons. Kitchen waste contains a lot of protein and sugar, and has high content of oil, salt and water. If it is not handled properly, the kitchen waste is easily spoiled and deteriorated, resulting in stench and endangering the environment. [0003] The treatment technologies of kitchen waste at home and abroad are mainly divided into two types: non-biological treatment and biological treatment. Non-biological treatment technologies include landfill, incineration, and mechanical crush...

AI Technical Summary

Problems solved by technology

Non-biological treatment technologies include landfill, incineration, and mechanical crushing; biological treatment technologies mainly include anaerobic fermentation and aerobic composting, but aerobic composting occupies a large area and is prone to odor, so its promotion is limited. Oxygen fermentation can produce valuable hydrogen and methane, with low energy consumption and less environmental pollution, so anaerobic fermentation technology is widely used, but the biogas slurry produced after anaerobic fermentation has a high solid content, high organic matter content, and ammonia nitrogen content It is also relatively high, the composition is complex, and the treatment is difficult, so the treatment of biogas slurry cannot be ignored.

[0004] At present, there are relatively few treatment technologies for the anaerobic fermentation biogas slurry of kitchen waste, and the process is simple and the operation is not stable enough. Therefore, a treatment method with mature technology, stable operation, and compliance with discharge standards is needed.

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