Treatment pattern of municipal solid wastes based on component and particle size

In order to explore the distribution of kitchen waste and calorific capacity among different sized municipal solid waste, and determine the treatment patterns based on the size distribution, the mixed sample municipal solid waste from two transfer stations for southern urban area of Beijing was divided into nine groups according to different sizes:<10, 10-<20, 20-<30, 30-<40, 40-<50, 50-<60, 60-<70, 70-80 and >80 mm, their physical compositions were classified, and the relationship between physical composition, moisture content and calorific value were analyzed. The screening process, treatment technologies and final processing mode, which suitable for different size of properties, were determined based on fuzzy clustering analysis, and the difference of final destination of material compared was analyzed with the original screening process. The results indicated that moisture and kitchen waste content were significantly negatively correlated with calorific value, the plastic and paper content showed a significant positive correlation with caloric value. The best screening process was taken at the 40mm and 80mm screening. The municipal solid waste under 40mm sieved can be taken as the composting materials. The materials for 40-80 mm can be incinerated with 80?mm sieved material after increasing calorific value through bio-drying pretreatment. The incineration and compost can residue for landfill. Further destination of material of this model showed that there were 579 t/d municipal solid waste by composting, 441.9 t/d by bio-drying pretreatment, 1148.2 t/d by incineration, and 390.8 t/d for landfill. Under this treatment pattern, the resources treatment rate of municipal solid waste improved by more than 50%, compost production increased by 68.6%, and landfill capacity reduced by about 74.9% for southern urban area of Beijing. This research can provide a theoretical evidence for the selection of screening technique and treatment pattern of municipal solid waste in the future, and the idea and method can also be a reference for other regions.