生活垃圾焚烧烟气中重金属排放水平及影响因素分析

通过对浙江省生活垃圾焚烧炉排放烟气中重金属的监测,分析生活垃圾焚烧烟气中重金属排放水平。结果表明,汞及其化合物的检出率最高,为95.7%,其次为铬和锰,检出率均为60%,且在不同的焚烧炉中重金属排放浓度差异较大,检出率最低的为铊和镉,且排放浓度均较低;焚烧炉排放烟气中汞及其化合物、镉+铊及其化合物、锑+砷+铅+铬+钴+铜+锰+镍及其化合物排放浓度均低于国标排放限值,最大占标率分别为76%、4%、21.9%。焚烧烟气中的重金属含量与焚烧垃圾中的重金属含量有关,烟气通过废气处理设施,可有效地减少重金属等污染物的排放。

Emission Level and Influence Factor of Heavy Metals in the Flue Gas from Municipal Solid Waste Incineration

The heavy metals emission level in the flue gas of municipal solid waste incineration in Zhejiang was investigated.The results showed that the detection rate of Hg and its compounds was the highest as 95.7%.Next were Cr and Mn with the detection rate of 60%,and the emission concentrations were great different in various incinerators.Tl and Cd had the lowest detection rate and low emission concentration.The emission concentration of Hg and its compounds,Cd,Tl and their compounds,Ti,As,Pb,Cr,Co,Cu,Mn,Ni and their compounds were all lower than national standard emission limits.The largest proportion of emission to the standard limits were 76%,4%and 21.9%respectively.The content of heavy metals in the flue gas was related to that in the waste.The emission of heavy metals and other pollutants could be effectively reduced by flue gas treatment.