Household garbage, kitchen garbage, municipal excrement and municipal sludge co-treatment method

Abstract

The invention relates to a household garbage, kitchen garbage, municipal excrement and municipal sludge co-treatment method which comprises the following steps: stabilizing biodegradable components in the household garbage and organic garbage by utilizing a biotechnology (aerobic fermentation); converting about 95% of degradable TOC and 86% of non-cellulose carbohydrate, and simultaneously utilizing heat in an organic matter degradation process to reduce the water content, so that the biological drying effect is achieved. Valuable resource substances (metal and plastic) in garbage are sorted out and recycled by utilizing a mechanical treatment technology, inert incombustibles such as gravels and glass are made into building materials, and remaining paper, wood, organic biomass and the like are made into stable high-quality fuel (RDF) for utilization, so that the effects of garbage recycling and reduction treatment are achieved. After the household garbage, the kitchen garbage, the municipal excrement and the sludge are cooperatively treated, the recycling rate reaches 50%, and recycling products include crude oil, biogas and RDF; the invention is suitable for serving as a novel garbage collection, transportation and treatment system for small and medium-sized cities.

Description

technical field [0001] The invention relates to a method for solid waste treatment, in particular to a method for synergistic treatment of domestic garbage, kitchen waste, municipal excrement and municipal sludge. Background technique [0002] In order to benefit from economies of scale, municipal solid waste treatment plants using traditional grate furnaces as combustion systems tend to build larger and larger. However, small and medium-sized counties and townships in most parts of my country are adopting informal methods such as simple landfill or nearby open-air incineration to dispose of garbage. The population density is low, and the amount of waste generated per capita is low. There are more than 600 counties with less than 300,000 people in my country, and the waste volume of these counties is less than 300 tons per day. If it is less than 300 tons per day, it cannot achieve the scale effect of incineration power generation, and it is difficult to invest in building a ...

AI Technical Summary

Problems solved by technology

However, small and medium-sized counties and townships in most parts of my country are adopting informal methods such as simple landfill or nearby open-air incineration to dispose of garbage. The population density is low, and the amount of waste generated per capita is low. There are more than 600 counties with less than 300,000 people in my country, and the waste volume of these counties is less than 300 tons per day. If the capacity is less than 300 tons per day, the scale effect of incineration power generation cannot be achieved, and it is difficult to invest in the construction of factories; third, it is far away from centralized large-scale waste treatment facilities, with high transportation costs and high risk of secondary pollution

[0004] The problem is that domestic waste has complex components, high plastic content, a lot of organic debris, and a certain amount of metals. Organic fertilizers made from domestic waste have risks such as heavy metal zinc exceeding the standard, bird flu virus and soil pollution. The Ministry of Agriculture 2020 In the "Commercial Organic Fertilizer NY 525 (Draft for Comment)" released in July 2019, it was proposed that domestic waste is a prohibited raw material

In addition, this process increases the water content of domestic waste from 60% to more than 80%, and water needs to be added at a ratio of 1:1. Although food waste can replace water, it still requires a large amount of additional water resources due to the small amount. At the same time, The extrusion and drying process will also produce a large amount of difficult-to-treat sewage, and the cost of sewage treatment is relatively high

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