Experimental study on Dispersion of incineration residue at MSW Landfill

在日本，二恶英一直是一个严重的环境问题。焚烧残渣含有二恶英，倾倒在垃圾填埋场会造成环境风险。在本研究中，利用实验室规模的风室，以水分含量为主要变量，研究了残留物分散的可能性。将几个城市生活垃圾焚烧炉的底灰注入一个风室，模拟垃圾填埋场的倾倒实践。水分含量是本研究的主要控制变量，并测定了室内空气采样器捕获的灰样和分散灰的粒度。粒径和含水率是影响焚烧灰分散的关键因素。可以得出结论，在焚化炉中对底灰进行润湿是足够安全的，可以防止扩散。粉煤灰中二恶英的浓度远高于底灰，应在填埋前进行固化处理。固化后的粉煤灰中只有极少的细颗粒会引起分散。

In Japan dioxin has been a big environmental concern. Incineration residue contains dioxin, and pose an environmental risk when dumped in a landfill. In this study, the possibility of dispersion of residues was studied by using lab-scale wind chamber, with moisture content as an main variable. Bottom ash from several MSW incinerators were injected in a wind chamber to simulate dumping practice in a landfill. Moisture content was main control variable in this study, and particle size of ash samples and dispersed ash captured by air samplers in the chamber were determined.Particle size and moisture content are found to be key factors for dispersion of incineration ash. It can be concluded that common practice of moistening of bottom ash in an incinerator is safe enough to prevent dispersion. Fly ash has much higher concentration of dioxin than bottom ash, so solidification treatment should be applied before landfilling. Solidified fly ash have only negligible fraction of fine particle to be feared for dispersion.