Status of kitchen waste disposal

 

According to the "Thirteenth Five-Year Plan for the Construction of Harmless Treatment Facilities for Urban Domestic Waste", nearly 86% of my country's kitchen waste has not been treated harmlessly, let alone resource utilization.

Kitchen waste characteristics:High moisture content, high organic content, containing a large number of pathogenic microorganisms, easy to rot and stink, breeding pests.

 

 

Early disposal: landfill or incineration

The investment is large, which is not conducive to the development of the ecological environment; the traditional landfill is easy to rot and stink and breed mosquitoes and flies in a relatively short period of time; the high moisture content affects the calorific value of the incineration plant

Domestic current main treatment process: aerobic composting, anaerobic digestion

Aerobic Compost:Poor compost quality. The maturity is low, the content of organic matter is more than 20%, and the content of impurities such as sand, glass and plastic is high. The composition is complex, the front sorting line is complex and lengthy, and the sorting effect is not good. The project occupies a large area and the odor control is difficult.

Anaerobic Digestion:Compared with aerobic composting, the investment is larger, but it has the advantages of short fermentation time, small footprint, resource utilization of biogas produced in anaerobic process, and small secondary pollution.

 

 

Advantages of dry anaerobic technology

 

 

Can cope with high solid feed

High impurity rate, high adaptability, low requirements for pretreatment process

Low mixing energy consumption

Low heating demand and low loss

High biogas yield

Less sewage production

High degree of automation, mature technology, spindle and other equipment can be made in China, easy to maintain

 

 

Dry anaerobic technology in construction case

 

 

Project scale:

Phase I -200t/d kitchen waste and 400t/d kitchen waste

Phase II-New Treatment of Kitchen Waste 200t/d

 

 

 

Treatment technology: STRABAG dry anaerobic technology

Treatment object: organic material after pretreatment of kitchen waste

Design processing scale: 220t/d,2 production lines, peak coefficient 110%

Volume size of single tank: length × width × height = 43 × 8m × 7.9m ≈ 2700m, effective volume 2400m ³