State Key Laboratory of Geohazard Prevention and Geoenvironment Protection (Chengdu University of Technology), Chengdu 610059, China; State Environmental Protection Key Laboratory of Synergetic Control and Joint Remediation for Soil & Water Pollution (Chengdu University of Technology), Chengdu 610059, China; College of Ecology and Environment (Chengdu University of Technology), Chengdu 610059, China.
State Key Laboratory of Geohazard Prevention and Geoenvironment Protection (Chengdu University of Technology), Chengdu 610059, China; State Environmental Protection Key Laboratory of Synergetic Control and Joint Remediation for Soil & Water Pollution (Chengdu University of Technology), Chengdu 610059, China; College of Ecology and Environment (Chengdu University of Technology), Chengdu 610059, China.
Waste Manag. 2022 Nov;153:312-322. doi: 10.1016/j.wasman.2022.09.017. Epub 2022 Sep 28.
Soil-like material (SLM) mined from municipal solid waste (MSW) landfills can be used as nursery cultivation soil, landfill cover, and as a building material. However, SLM utilization is restrained by heavy metal (HM) contents whose speciation and migration are influenced by their dissolved organic matter (DOM) content. Therefore, the properties of aged refuse and the correlation between DOM and HM forms were studied using samples from different types of MSW landfills. The dominant components of aged refuse were SLM (18.80%-83.51%) and plastics (11.17%-65.51%). The moisture, organic matter, and pH ranged from 29.55% to 57.92%, 15.70%-57.68%, and 7.84-8.51, respectively. The Zn content was highest (455.48-1379.27 mg/kg) in the SLM, followed by Cu (96.29-428.90 mg/kg), Cr (49.10-236.21 mg/kg), Pb (53.52-222.71 mg/kg), and Ni (20.92-39.10 mg/kg). The SLM cannot be used for agriculture because the HM contamination exceeds the multiple of 0.07-7.99. Zinc in the acid-soluble state and reducible state had the highest mobility in SLM. However, Cu and Pb, mainly in the oxidizable state, and Cr and Ni, in the oxidizable and residual states, were relatively stable. In the sanitary and simple MSW landfills, the average proportion of protein-like materials decreased from 84.44% to 82.61% and from 65.58% to 55.94%, respectively, as the landfill depth increased. Both the acid-soluble and oxidizable HM states and all forms of Zn in the SLM were significantly positively correlated with tyrosine-like materials (r = 0.58*-0.87**). Protein-like materials may enhance the mobility of HMs.
从城市固体废物（MSW）填埋场开采的类似土壤的材料（SLM）可用作苗圃栽培土壤、垃圾填埋场覆盖物和建筑材料。然而，由于其溶解有机物（DOM）含量的影响，重金属（HM）的形态和迁移受到限制。因此，本研究采用不同类型 MSW 填埋场的样品，研究了老化垃圾的特性以及 DOM 和 HM 形态之间的相关性。老化垃圾的主要成分是 SLM（18.80%-83.51%）和塑料（11.17%-65.51%）。水分、有机物和 pH 值分别为 29.55%-57.92%、15.70%-57.68%和 7.84-8.51。SLM 中 Zn 含量最高（455.48-1379.27 mg/kg），其次是 Cu（96.29-428.90 mg/kg）、Cr（49.10-236.21 mg/kg）、Pb（53.52-222.71 mg/kg）和 Ni（20.92-39.10 mg/kg）。由于重金属污染超过 0.07-7.99 倍，SLM 不能用于农业。在 SLM 中，酸可溶态和可还原态的 Zn 具有最高的迁移性。然而，Cu 和 Pb 主要以氧化态存在，Cr 和 Ni 以氧化态和残留态存在，相对稳定。在卫生和简单的 MSW 填埋场中，随着填埋深度的增加，蛋白样物质的平均比例分别从 84.44%降至 82.61%和从 65.58%降至 55.94%。SLM 中的酸可溶态和可氧化态 HM 以及所有形态的 Zn 与酪氨酸样物质均呈显著正相关（r=0.58*-0.87**）。蛋白样物质可能会增强 HM 的迁移性。
