Kong Qingna, Yao Jun, Qiu Zhanhong, Shen Dongsheng
Center of Marine and Ecological Environment Protection, Taizhou University, Linhai 317000, China.
Center of Marine and Ecological Environment Protection, Taizhou University, Linhai 317000, China; Department of Environmental Engineering, Zhejiang University, Hangzhou 310029, China.
Biomed Res Int. 2016;2016:9687879. doi: 10.1155/2016/9687879. Epub 2016 Dec 1.
Municipal solid waste incinerator (MSWI) bottom ash is often used as the protection layer for the geomembrane and intermediate layer in the landfill. In this study, three sets of simulated landfills with different mass proportion of MSWI bottom ash layer to municipal solid waste (MSW) layer were operated. Cu and Zn concentrations in the leachates and MSW were monitored to investigate the effect of MSWI bottom ash layer on the Cu and Zn discharge from the landfill. The results showed that the Zn discharge was dependent on the mass proportion of MSWI bottom ash layer. The pH of landfill was not notably increased when the mass proportion of MSWI bottom ash layer to MSW layer was 1 : 9, resulting in the enhancement of the Zn discharge. However, Zn discharge was mitigated when the mass proportion was 2 : 8, as the pH of landfill was notably promoted. The discharge of Cu was not dependent on the mass proportion, due to the great affinity of Cu to organic matter. Moreover, Cu and Zn contents of the sub-MSW layer increased due to the MSWI bottom ash layer. Therefore, the MSWI bottom ash layer can increase the potential environmental threat of the landfill.
城市固体废弃物焚烧炉（MSWI）底灰常被用作垃圾填埋场中土工膜的保护层和中间层。在本研究中，运行了三组模拟填埋场，其中MSWI底灰层与城市固体废弃物（MSW）层的质量比例不同。监测渗滤液和MSW中铜和锌的浓度，以研究MSWI底灰层对垃圾填埋场中铜和锌排放的影响。结果表明，锌的排放取决于MSWI底灰层的质量比例。当MSWI底灰层与MSW层的质量比例为1∶9时，填埋场的pH值没有显著升高，导致锌排放增加。然而，当质量比例为2∶8时，由于填埋场pH值显著升高，锌排放减少。由于铜对有机物具有很强的亲和力，铜的排放不取决于质量比例。此外，由于MSWI底灰层，MSW下层的铜和锌含量增加。因此，MSWI底灰层会增加垃圾填埋场潜在的环境威胁。
