EMISSION CHARACTERISTICS OF HEAVY METALS AND ORGANIC POLLUTANTS FROM THE COMBUSTION OF SEWAGE SLUDGE

摘要：

In this study, a bench-scale fluidized bed combustor (FBC) was used to investigate the partitioning of 9 heavymetals (Cd, Co, Cr, Cu, Mn, Ni, Pb, V, Zn) and organic hazardous air pollutants including aliphatics, monoaromaticcompounds, cyclic hydrocarbons and PAHs, in the gas and solid phases of emissions from combustion of 7 sewagesludge samples. The concentrations of heavy metals (HMs) in two main ash streams (bottom ash and fly ash) weredetected by inductively coupled plasma–optical emission spectroscopy (ICP–OES). It was found that the concentrationof zinc was the highest in bottom and fly ashes, ranging from 1600–1900 and 2200–2900 mg/kg, respectively. Theaverage concentrations of heavy metals analysed in bottom ashes followed the order of Zn > Cu > Mn > Cr >Ni > Pb >V > Cd > Co. Co and Cu were mostly found in bottom ashes while Pb and Zn in fly ashes, other HMs almost equallydistributed between bottom and fly ashes. Organic pollutants in flue gas trapped onto the XAD resin and in fly ash wereextracted with dichloromethane and analyzed using gas chromatography–mass spectrometry (GC–MS) analyzer. Theresults showed that PAHs were more likely emitted in flue gas than in fly ash, and the concentrations of PAHs both influe gas and in fly ash of sludge combustion were in a reasonably comparable range, with a maximum concentrationreached 0.03 mg/L. Aliphatics were mainly recovered from fly ashes (>70％) while monoaromatic compounds werefound in both flue gases and fly ashes, and cyclic hydrocarbons were undetectable for most of sludge samples. The totalamount of HAPs in the flue gases increased most likely with respect to the increasing H/C ratio of the sludge samples.

关键词： Sewage sludge Combustion Emissions PAHs Heavy metal FBC

作者: Jingai SHAO Rong YAN Hanping CHEN Baowen WANG Dongho LEE Ming LIU DavidTee LIANG

作者单位: State Key Laboratory of Coal Combustion, Huazhong University of Science and Technology, Wuhan, P.R.C Institute of Environmental Science and Engineering, Nanyang Technological University, Innovation Cen State Key Laboratory of Coal Combustion, Huazhong University of Science and Technology, Wuhan, P.R.C Institute of Environmental Science and Engineering, Nanyang Technological University, Innovation Cen

会议类型: 国际会议

会议名称: 第六届煤燃烧国际会议(The 6th International Symposium on Coal Combustion)

会议地点: 武汉

会议语种:英文

页码: 395-401

在线出版日期: 2007-12-01（万方平台首次上网日期，不代表论文的发表时间）