垃圾焚烧飞灰中重金属的稳定化处理

Stabilized treatment research of heavy metal in waste incineration fly ash

根据GB 16889—2008《生活垃圾填埋污染控制标准》对飞灰的豁免管理要求,研究垃圾焚烧飞灰中重金属的稳定化处理,最终确定飞灰能够满足进入垃圾填埋场要求的最佳螯合剂添加比例。通过调整2种螯合剂的添加比例研究其对垃圾焚烧飞灰中重金属的稳定化处理效率。结果表明,飞灰浸出液中铅、镍浸出浓度超过GB 16889—2008标准要求(铅超标13.28倍,镍超标1.42倍),当螯合剂1的添加比例为飞灰质量的2.0%、螯合剂2的添加比例为飞灰质量的2.5%时,铅、镍浸出浓度低于标准限值,满足生活垃圾填埋场入场要求,其中螯合剂1对铅、镍的稳定化效率分别为93.42%和59.11%,螯合剂2对铅、镍的稳定化效率分别为93.5%和60.02%。

Considering pollution control standards of municipal solid waste landfill （GB16889--2008）, the stabilized treatment of heavy metal in fly ash was studied, which aimed to finalizing the optimum addition ratio of chelating agent to meeting the requirements in GB16889--2008. The stabilized heavy metals efficiency was compared between cement solidification and two organic chelating agents in different proportions. The results show that the lead, nickel leaching concentrations exceed the standards in the fly ash leaching solution, in which lead exceeds 13.28 times and nickel exceeds 1.42 times. When the two chelating agent are added 2.0% and 2.5%, the concentrations of lead and nickel in leaching solution are below the standard limits in GB 16889--2008 to meet landfill admission requirements. Wherein the stabilized efficiency of lead and nickel are 93.42% and 59.11% with the first chelating agent, and the stabilized efficiency are 93.5% and 60.02% when the second chelating agent is used.