Kitchen waste treatment method

Abstract

The invention discloses a kitchen waste treatment method. The kitchen waste treatment method comprises the following steps: a, performing pyrohydrolysis on mixed kitchen wastes and sludge; b, performing anaerobic digestion on the pyrohydrolyzed mixture; and c, performing biogas purification on the generated mixed gas in anaerobic digestion. Kitchen wastes are treated by virtue of pyrohydrolysis and anaerobic digestion successively, and pyrohydrolysis as pre-treatment can improve the anaerobic digestion efficiency, so that purposes of improving the sludge dewatering property, degrading organic matters and killing pathogenic bacteria are achieved, and meanwhile, the method can purify biogas by purification to use internal energy of the biogas, and the biogas residues can be used for preparing fertilizers or cultivating trees, thereby playing roles of saving energy and reducing emission, being green and environmentally friendly and sustainable in development on treatment of the kitchen wastes. The method disclosed by the invention can be applied to kitchen waste treatment.

Description

technical field [0001] The invention relates to the field of kitchen waste treatment, in particular to a kitchen waste treatment method. Background technique [0002] With the rapid development of the economy and the rapid urbanization process, the amount of kitchen waste is also increasing year by year, and the ensuing environmental pollution problems are also becoming more and more serious. The current treatment methods of food waste mainly include landfill, incineration, composting, and anaerobic digestion. Anaerobic digestion is widely used to degrade food waste and recover clean energy such as biogas and hydrogen. However, when the kitchen is anaerobically digested alone, a large amount of organic matter is easily converted into VFAs during the acidification process, resulting in a sharp drop in pH, inhibiting or even terminating the subsequent methane production process; while when the remaining sludge is anaerobically digested alone, its biodegradable substances are d...

AI Technical Summary

Problems solved by technology

However, when the anaerobic digestion of the kitchen alone, a large amount of organic matter is easily converted into VFAs during the acidification process, resulting in a sharp drop in pH, inhibiting or even terminating the subsequent methane production process; and when the remaining sludge is anaerobically digested alone, its biodegradable substances are difficult to dissolve And the content of toxic components is high, resulting in low efficiency of biogas production

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