生活垃圾焚烧飞灰中重金属浸出影响研究

Influenceof Heavy Metal Leaching in Domestic Garbage Fly Ash

通过浸出液p H测定、全量测定以及(HJ/T 299-2007)硫酸硝酸法和(HJ/T 300-2007)醋酸缓冲溶液法浸提,对生活垃圾焚烧飞灰中重金属浸出特性进行了实验研究。结果表明浸出p H条件、飞灰中重金属含量以及重金属分布形态是影响浸出浓度的主要因素。相比于硫酸硝酸法,醋酸缓冲溶液法重金属提取效率明显较高,尤其是铜锌镉铬。垃圾焚烧飞灰潜在环境风险较大,在填埋处理及综合利用时应充分考虑其浸出特性。

The leaching characteristics of heavy metals in domesticgarbage fly ash were studied by p H tests,totalheavy metals content tests,HJ / T299- 2007 sulfuric acid nitric acid method and HJ / T300- 2007 acetic acid buffer solution method. The results showed that the p H condition,the heavy metal content in fly ash and the distribution of heavy metals in fly ash were the main factors affecting the leaching concentration. Compared with the sulfuric acid nitric acid method,the extraction efficiency of heavy metals was significantly higher than that of the acetic acid buffer solution method. The potential environmental risks of domesticgarbage fly ashwere great,and the leaching characteristics should be fully considered in the process of landfill treatment and comprehensive utilization.