不同粒径城市垃圾焚烧飞灰中重金属的浸出规律研究

Lixivition Investigation of Heavy Metal in Municipal Solid Waste Incineration Fly Ash

集中焚烧法已经逐渐成为我国城市生活垃圾处理的主要方式,但其中的重金属在焚烧过程中不会被破坏,最终主要集中在垃圾焚烧飞灰中排出。在垃圾焚烧飞灰的安全填埋过程中由于受到环境因素的影响,例如酸雨,其中的重金属会逐渐的发生迁移,从而影响环境。文章对不同粒径的垃圾焚烧飞灰中的重金属浸出特性进行了研究,实验结果表明:小粒径垃圾焚烧飞灰所占比例较大。不同粒径对重金属的浸出特性比较复杂,浸出浓度均不相同,其中除尘器飞灰中的重金属浸出浓度远高于其他三种飞灰,属于有浸出毒性的危险废物。

Centralized incineration method has gradually become China city life garbage disposal methods,but the heavy metals in the incineration process will not be damaged,eventually mainly concentrated in the municipal solid waste incineration fly ash discharge.In waste incineration fly ash landfill process due to the influence of environmental factors,such as acid rain,the heavy metal will gradually migrate,thus affecting the environment.The paper discusses the different particle size of heavy metals in incineration fly ash leaching properties were studied,the experimental results show that： large proportion of MSWI fly ash are the small particles.Different particle size on leaching characteristics of heavy metals is more complex,the leaching concentrations are not the same,wherein the dust remover in the fly ash heavy metal leaching concentration much higher than that of other three kinds of fly ash,belongs to the leaching toxicity of hazardous waste.