| With the rapid development of our economy and society, The municipal solid waste and pollution of the environment have become one of the major problems urgently that need to be solved in current city construction and development.It’s the important development direction of the world’s cement technology and municipal solid waste disposal technology that use characteristics of the disposal of garbage include of special high temperature from cement kiln with alkaline environment, long process, which not only to dispose of harmless environmental protection effect is good, and the residue after disposal can all be cement production of the original fuel.Biological drying technology is one of the core technology for cement kiln collaborative disposal of municipal solid waste, which can not only remove the adsorption of water and free water, but also effectively remove biological combined water, greatly reduce the moisture content of waste, improve the drying efficiency and product RDF(Refuse Derived Fuel) calorific value. But the influence factors of biological drying technology and immature technology will lead to industrialization of the technology applied in drying process stability is poorer, breeds into such problems as the secondary pollutants. To solve these problems, taken the municipal solid waste as the research object, influences of the accumulation parameter, carbon source, microbial agents were studied and designed a set of municipal solid waste optimization technology and studied the effect of process optimization.The results showed that at the beginning of the biological drying, by adjusting the initial accumulation body the dump parameters can effectively improve the gas cycle efficiency of pile body and pass rate, thus increasing the temperature of the landfill body and microbial activity. When the accumulation rate was 75%, the bulk density was 0.51×103kg/m3, the highest temperature of the MSW ascent to 67 ℃, microbial content up to 1.25×108cfu/g. Compared to the drying product without optimizing the initial accumulation parameters, the optimized product moisture content down to 33% of the RDF, calorific value increased to 12000 kJ/kg.By adding exogenous microbial agents can solve the problem of insufficient bacteria number in the prophase of MSW biological drying. The research results show that when exogenous bacterial species and the volume of leachate is 3:1, strains obtained by microbial agents content up to 2.4×108cfu/g, the MSW biggest pile of body moisture removal rate reached 49.3%. At the end of the drying, compared with the blank group, test product moisture content down to 32.5% of the RDF, calorific value increased to 11800 kJ/kg.By adding carbon source could solve the problem of the organic matter insufficient in the MSW biological drying process. The results show that the wood is more conducive to microbial decomposition supplementary carbon source, for the promotion of urban house refuse late biological drying effect; After adding sawdust, pile body do not fall late drying temperature rise, up to 34 ℃, and microorganism activity enhancement, bacterial number up to 1.3×108cfu/g. At the end of the drying, compared with the blank group, test product moisture content down to 34% of the RDF, calorific value increased to 11500 kJ/kg.According to the characteristics of the biological drying at different times, taken different optimization methods, which optimize the biological process for the dry and enhance the efficiency of the garbage biological drying. The research results show that taking the early adjustment accumulation parameter, adding exogenous microbial agents, medium-term adding carbon source the optimization process can significantly improve waste accumulated temperature effect, up to 387.8℃·d. At the end of the drying, compared with the blank group, RDF moisture content down to 31%, calorific value increased to 12800 kJ/kg.The results of this study can provide scientific basis for MSW optimization and application of technology. |
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