生活垃圾生物预处理对As Pb Cr生物有效性的影响

采用室内模拟试验,研究了生物预处理工艺对生活垃圾As、Pb、Cr总量和生物有效性(水提取态、DTPA提取态、EDTA提取态)的影响.结果表明:由于“相对浓缩效应”和淋滤的交互作用,As、Pb和Cr总量分别升高了1.96%、6.13%和10.81%；生物预处理后,w(水溶态As)、w(DTPA-As)和w(EDTA-As)分别升高了51.46%、26.65%和19.02%,w(水溶态Pb)、w(DTPA-Pb)和w(EDTA-Pb)分别升高了36.59%、22.91%和17.48%,w(水溶态Cr)、w(DTPA-Cr)和w(EDTA-Cr)分别升高了9.01%、12.79%和8.77%.模拟试验结果证实,生活垃圾生物预处理在一定程度上增加了As、Pb和Cr总量及其生物有效性,可能会增加后续堆肥土地利用的环境风险和填埋对地下水的污染风险. 

Effects of Bio-Pretreatment on Bioavailability of Arsenic,Chromium and Lead in Domestic Waste

The effects of bio-pretreatment on gross quantity and bioavailability of As,Pb,Cr in domestic waste were investigated by indoor simulation experimentation.The results showed that,due to the "relative concentrating effect" and leaching,the content of As,Pb and Cr increased by 1.96%,6.13% and 10.81%,respectively,and the content of water soluble As,DTPA-As,EDTA-As,water soluble Pb,DTPA-Pb,EDTA-Pb,water soluble Cr,DTPA-Cr and EDTA-Cr increased by 51.46%,26.65%,19.02%,36.59%,22.91%,17.48%,9.01%,12.79% and 8.77%,respectively.The simulation experiment results demonstrated that,to a certain extent,bio-pretreatment of domestic waste increased the gross quantity and bioavailability of As,Pb and Cr.This may increase the environmental risk of utilization of compost,and underground pollution risk of treatment through landfilling.