Recycling treatment method and system for kitchen waste

Abstract

The invention discloses a recycling treatment method and system for kitchen waste. The method comprises the following steps: (1) performing integrated pretreatment on the kitchen waste to be treated: (a) hydraulically separating the solid particles which cannot be biologically degraded in the kitchen waste and removing the solid particles; (b) heating the hydraulically separated material to melt out grease in the material, and performing air floatation degreasing to obtain a degreased material; (c) breaking and pulping the material, and discharging the grit impurity in the material and the slurry material to be treated from the bottom surface and side surface of a container respectively; and (d) adjusting the pH value of the slurry material after the breaking and pulping to 6.5-7.5; (2) performing anaerobic digestion treatment on the slurry material to generate biogas; and (3) purifying the biogas generated after the anaerobic digestion to obtain methane with predetermined concentration value. The method can realize efficient recycling of resources as well as low loss of output equipment.

Description

technical field [0001] The invention relates to the technical field of solid waste resource treatment, in particular to a method and system for resource treatment of kitchen waste. Background technique [0002] With the development of the economy and the improvement of people's living standards, the increase in the generation of urban organic waste has aroused widespread concern, especially the kitchen waste. According to the survey, in Beijing, Shanghai, Shenzhen, Guangzhou and other cities with a population of tens of millions, the amount of food waste generated exceeds 1000t / d, and it is increasing year by year. [0003] Because food waste contains a lot of organic matter and oil, some unscrupulous traders take simple methods to extract oil from food waste and reprocess it into food oil; "Shuishui pigs", these practices have directly or indirectly caused great harm to food safety. However, if these solid wastes are directly landfilled or piled up, serious secondary poll...

AI Technical Summary

Problems solved by technology

[0005] Based on this, since food waste is directly separated by air flotation, part of the oil is easily taken away by adsorbents such as plastics, and part of the oil is lost, which is not conducive to the recycling and reuse of resources.

In addition, the high viscosity of the material to be treated in this process will increase the energy consumption of the conveying equipment, which is not conducive to energy saving

[0006] Therefore, how to avoid the low recovery rate of resources and the high energy consumption of conveying equipment in the treatment of kitchen waste has become an urgent problem to be solved by people today.

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