Preliminary Study of PM2.5 Formation During Municipal Solid Waste Incineration

Air pollution, especially PM2.5 pollution in atmosphere, is serious in China and municipal solid waste incineration is one of the major emission sources of PM2.5. In order to find out the mechanism of PM2.5 formation during incineration, experiments were performed. Firstly, real constituents of municipal solid waste were conducted by a literature survey; secondly, each constituent was incinerated in tube furnace respectively and together according to survey results, in all 7 treatments. They were kitchen waste, sawdust, plastic, paper, rag, glass and mixed rubbish comprising each constituent. Meanwhile PM2.5 was collected and weighed; finally, according to constituent ratio and PM2.5 mass each constituent produced, the simulate value of mixed rubbish was calculated. The results showed that among the single constituent incineration experiments, plastic accounted for more PM2.5 mass than any other constituents. And the followings were rag, kitchen waste, paper, sawdust and glass. Plastic produced 20.5725 mg (PM2.5)/ g (plastic) which is approximately 4 times than rag, 5 times than kitchen waste. Glass produced least only 0.2472 mg (PM2.5)/ g (glass). Compared with single constituent incineration, PM2.5 which mixed rubbish produced was only less than rag's. The simulate value of PM2.5 mixed rubbish produced was 4.9108 mg (PM2.5)/g (simulate sample), which is more than the value (4.2929 mg (PM2.5)/g (mixed rubbish)) the real mixed rubbish produced. This proved there was a probability that inhibitory effect existed during mixed rubbish incineration. And the inhibition effect was up to about 0.6179 mg (PM2.5)/g (mixed rubbish).