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SGA对垃圾焚烧飞灰中重金属的固化性能研究

Keywords: 重金属固化剂,飞灰,重金属,稳定化

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Abstract:

根据EPA1311、HJ/T299-2007、HJ/T300-2007和HJ557-2009等国内外不同标准,研究了深圳某垃圾焚烧发电厂垃圾焚烧飞灰的浸出毒性,探讨了六硫代胍基甲酸(sixthioguanidineacid,SGA)、二甲基二硫代氨基甲酸盐(sodiumdimethyldithiocarbamate,SDD)和Ca(OH)2浓度对垃圾焚烧飞灰中重金属的固定性能的影响。研究结果表明,随着浸提液pH的降低,该厂焚烧飞灰中大部分金属元素的浸出量增大,焚烧飞灰浸出液中的Cd、Ni、Pb和Zn浓度分别超过国家危险废物鉴别标准(GB5085.3-2007)规定值的4.75倍、1.47倍、6.72倍和2.20倍,属于危险废弃物,必须进行稳定化处理。当固化剂SGA加入量为0.1mol/kg时,稳定化后的重金属浸出浓度已经低于危险废物鉴别标准,且对Cd、Cr、Cu和Pb的固化性能优于SDD和Ca(OH)2;当固化剂SGA、SDD和Ca(OH)2加入量为0.5mol/kg时,稳定化后的焚烧飞灰重金属浸出浓度均低于国家危险废物鉴别标准(GB5085.3-2007)中的规定值。与SDD和Ca(OH)2相比,SGA对垃圾焚烧飞灰中重金属的固化处理更具有优势。

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