Method for pretreating urban and rural domestic refuse by means of mechanical-biological method

Abstract

The invention discloses a method for pretreating urban and rural domestic refuse by means of a mechanical-biological method, and relates to the technical field of environmental protection. According to the technological process, the method is prominently characterized in that primary crushing and mechanical retransfer are adopted, and then a pore texture beneficial for bio-drying is formed; and free transfer of moisture of domestic refuse is achieved in the bio-drying process, and then water on the surface of the domestic refuse is removed in a mechanical squeezing manner, and therefore effective solid-liquid separation of the domestic refuse is achieved. Products produced through mechanical-biological method pretreatment are suitable for cement kiln collaborative incineration disposal or grate furnace incineration disposal. According to the method for pretreating the urban and rural domestic refuse by means of the mechanical-biological method, by means of organic linking with an incineration system, harmlessness and cleanliness of the pretreatment process can be achieved, improving of the domestic refuse quality is completed, and recycling, reducing and harmless utilization is achieved.

Description

technical field [0001] The invention relates to the field of environmental protection technology, in particular to a mechanical-biological pretreatment process for urban and rural household waste using core technologies such as mechanical crushing, biological drying, and mechanical extrusion. Background technique [0002] With the development of my country's urbanization process and the construction of new urban and rural areas under the new normal economic transformation, domestic waste from cities and towns has brought severe social and environmental pressure to our country. At present, domestic waste disposal is mainly based on sanitary landfill and incineration for power generation. Mainly, its development trend, applicable conditions and scope are gradually becoming clearer. [0003] Sanitary landfill is the mainstream method of domestic waste. With the standardization of environmental protection laws and regulations, the development of urbanization, and the long-term im...

AI Technical Summary

Problems solved by technology

As a public theory of waste incineration, based on the calculation of waste entering the incinerator, from the perspective of theoretical calculations, it is analyzed that domestic waste with a low-level received base calorific value below 800kcal / kg cannot form its own stable combustion; the actual factory operation has a low-level received base calorific value Domestic waste above 860kcal / kg can be burned stably but cannot meet the compliance standards for flue gas emission; domestic waste with a base calorific value above 1200kcal / kg at a low level can achieve combustion stability above 850°C by itself; The domestic waste with a base calorific value above 1400kcal / kg is economically valuable for heat and electricity recycling.

Compared with the perfect waste classification management system in developed countries, due to the influence of many factors such as construction and operation, domestic waste collection in China is basically in a mixed collection mode, with high moisture content, high ash content, low calorific value, and organic waste. The characteristics of low recycling ratio of high-priced resources restrict the further development of domestic waste incineration and disposal

Images