Method and system for recycling urban community organic waste

Abstract

The invention relates to a method and system for recycling urban community organic waste, which comprises the following steps: crushing kitchen waste from all families in the community into 2-3mm-granule organic waste, hydrolyzing, mixing the hydrolysis wastewater with toilet flushing water of all families in the community, concentrating to obtain high-concentration sewage with the organic matter concentration of 10-15%, carrying out anaerobic digestion on the high-concentration sewage to obtain marsh gas and a digestive fluid, carrying out desulfurization purification on the marsh gas to obtain pure marsh gas, treating the digestive fluid to obtain a fertilizer and acceptable sewage, and discharging the acceptable sewage into a municipal sewage pipe network. The waste is pretreated at the generation source, and subjected to anaerobic digestion treatment in situ, and thus, the method has the advantages of short process and low treatment cost. Various types of waste are not piled or transported, thereby avoiding environment pollution. The treatment object only comprises kitchen waste and toilet flushing waste generated in the community, so the component is simple; and therefore, the method has favorable anaerobic digestion effect.

Description

technical field [0001] The invention relates to the field of energy and environmental protection, in particular to a method and system for recycling organic waste in urban communities. Background technique [0002] At present, the organic waste treatment method in urban communities is that the kitchen waste is merged into the municipal waste into the waste treatment plant for incineration and landfill, and the toilet flushing sewage is discharged into the urban underground water pipe network and collected in the sewage treatment plant for treatment. On the one hand, this treatment method wastes the chemical energy of the organic waste itself, on the other hand, it increases the load of the garbage treatment plant and the sewage treatment plant, and increases the cost of organic waste during transportation. [0003] Patents CN201110046401 and CN201110196314 jointly process urban sludge, feces, and kitchen waste, and patent CN201210031323 jointly processes solid domestic waste...

AI Technical Summary

Problems solved by technology

On the one hand, this treatment method wastes the chemical energy of organic waste itself, on the other hand, it increases the load of waste treatment plants and sewage treatment plants, and increases the cost of organic waste during transportation.

[0003] Patents CN201110046401 and CN201110196314 jointly process urban sludge, feces, and kitchen waste, and patent CN201210031323 jointly processes solid domestic waste, kitchen waste, and melon, fruit, and vegetable waste collected from farmers’ markets. Centralized stacking treatment, the stacking space, transportation links and other issues involved may cause pollution to the environment, and increase the cost of organic waste treatment

In addition, organic waste such as urban sludge and solid domestic waste has complex components, and some components cannot even undergo anaerobic fermentation. When they are treated together with kitchen waste and toilet flushing waste, etc., it will have a greater impact on the effect of anaerobic digestion. The pretreatment process of mud, solid domestic waste, etc. will further increase the treatment cost

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