2012•Environmental Science & TechnologyRequires access
Pollution Characteristics of Heavy Metals in MSWI Fly Ash
Shu-Mei Huang
Open publisher page 3 citations
Abstract
Speciation of heavy metal,heavy metal content and heavy metal leaching toxicity under various size fractions of Guangxi and Chongqing municipal solid waste incineration(MSWI)fly ash were studied.Results showed that all 5 kinds of heavy metals in Guangxi MSWI fly ash were mainly in the residual form.Among the samples of Chongqing,Cr was mainly in the residual form,while Zn,Cu and Cd were mainly in the form of acetic acid extractable.Pb was only in the form of acetic acid extractable and reduction extractable,and Mn could be mainly in the form of reduction extractable.The heavy metal elements all have showed a tendency to the concentration of small particles.With the decrease of particle size,the leaching of heavy metals tended to increase.Amount of Zn,Cu,Pb and Cd leaching in Chongqing MSWI fly ash were higher than that of Guangxi.Leaching toxicity in various size fractions of fly ash didn’t exceed the standard in Guangxi,while those of Zn,Pb and Cd in Chongqing were seriously beyond the standard,which indicated that MSWI fly ash of Chongqing was typical hazardous waste.