SHU Center of Green Urban Mining & Industry Ecology, School of Environmental and Chemical Engineering, Shanghai University, No. 381 Nanchen Road, Shanghai 200444, PR China; Design Institute 5, Shanghai Municipal Engineering Design and Research Institute (Group) Co., Ltd., NO. 901 North Zhongshan Road (2nd), Shanghai 200092, PR China.
SHU Center of Green Urban Mining & Industry Ecology, School of Environmental and Chemical Engineering, Shanghai University, No. 381 Nanchen Road, Shanghai 200444, PR China.
Sci Total Environ. 2023 Jan 20;857(Pt 1):159299. doi: 10.1016/j.scitotenv.2022.159299. Epub 2022 Oct 7.
Policy is a powerful tool determining solid-waste treatment and disposal. In 2019, China carried out the "garbage-classification policy" in 46 cities. So-called dry garbage is then separated from municipal solid waste and treated alone by incineration. This work investigated the influence of the policy on contents and leaching characterizations of municipal solid waste incineration fly ash. Median value of Cl was significantly increased from 17.43 wt% to 28.63 wt%. Median content of CaO maintained a similar value (51.21 wt% and 47.27 wt%). Ten year ago, CaClOH was not generally observed in fly ash. However, this phase was widely detected nowadays. Median value of heavy-metal (Zn, Pb, Cu, Cd, Cr, and Ni) was decreased from 9007.69 mg/kg to 7652.72 mg/kg. Thus, the policy also positively affected hazardous-waste collection. Heavy-metal leaching concentrations were decreased and chemical speciation became more stable because CaClOH supplied more alkalinity and binding ability for heavy metals. Therefore, fly-ash treatment technologies and their running parameters should be regulated to adapt above new characterizations after the garbage-classification policy.
政策是决定固体废物处理和处置的有力工具。2019 年，中国在 46 个城市实施了“垃圾分类政策”。所谓的干垃圾随后与城市固体废物分离，并单独通过焚烧进行处理。这项工作研究了政策对城市固体废物焚烧飞灰含量和浸出特性的影响。Cl 的中值显著从 17.43wt%增加到 28.63wt%。CaO 的中值含量保持相似的数值（51.21wt%和 47.27wt%）。十年前，飞灰中一般不会观察到 CaClOH。然而，现在这种相被广泛检测到。重金属（Zn、Pb、Cu、Cd、Cr 和 Ni）的中值从 9007.69mg/kg 降低到 7652.72mg/kg。因此，该政策也对危险废物的收集产生了积极影响。由于 CaClOH 为重金属提供了更多的碱度和结合能力，因此重金属的浸出浓度降低，化学形态变得更加稳定。因此，在垃圾分类政策实施后，应调整飞灰处理技术及其运行参数，以适应上述新特性。
