| 固化/稳定化垃圾焚烧飞灰中的Pb在干湿交替环境中的溶出风险评估 |
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| 引用本文： | 吴翔宇,王禕天,张晗,徐宏勇,蔡兰坤. 固化/稳定化垃圾焚烧飞灰中的Pb在干湿交替环境中的溶出风险评估[J]. 环境工程, 2020, 38(11): 135-139. DOI: 10.13205/j.hjgc.202011022 |
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| 作者姓名： | 吴翔宇 王禕天 张晗 徐宏勇 蔡兰坤 |
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| 作者单位： | 华东理工大学 资源与环境工程学院 国家环境保护化工过程环境风险评价与控制重点实验室, 上海 200237 |
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| 摘 要： | 评估了水泥+螯合剂协同处理垃圾焚烧飞灰中的铅(Pb)在干湿交替环境中的溶出风险。结果表明:在干湿交替环境中,水泥+螯合剂协同处理飞灰的矿物组成可保持稳定,水化程度有所提高。经过30次干湿交替后,由于飞灰颗粒受到更多水化产物的保护,Pb的浸出毒性从0.15 mg/L降低至0.05 mg/L。另外,协同处理与单独的水泥固化相比,对Pb的稳定化效果更好,Pb的浸出毒性更易达到GB 16889—2008《生活垃圾填埋场污染控制标准》;经过同样的12次干湿交替后,协同处理飞灰中Pb的浸出毒性(<0.05 mg/L)远低于单独的螯合稳定飞灰(0.53 mg/L),溶出风险显著降低。因此,水泥+螯合剂协同工艺适用于干湿交替高发地区的垃圾焚烧飞灰中Pb的稳定化处理。
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| 关 键 词： | 重金属污染 干湿交替 飞灰 水泥固化 螯合稳定 |
| 收稿时间： | 2019-11-08 |
LEACHING ENVIRONMENTAL RISK EVALUATION OF Pb IN SOLIDIFIED/STABILIZED MUNICIPAL SOLID WASTE INCINERATION FLY ASH UNDER WETTING AND DRYING INTERMITTENT |
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| Affiliation: | State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process, School of Resources and Environmental Engineering, East China University of Science and Technology, Shanghai 200237, China |
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| Abstract: | This study evaluated the environmental risk of lead (Pb) under wetting and drying (W-D) intermittent in fly ash from municipal solid waste incineration (MSWI), co-treated with cement and chelator. The results showed that the mineral composition of the co-treated fly ash kept stable and the hydration degree improved under W-D intermittent. Thus, the environmental risk of Pb got reduced due to the protection by more hydration products. In addition, compared with traditional cement-solidification method, co-treatment was more efficient in stabilizing Pb and easily made Pb meet the standard for pollution control of the landfill site of municipal solid waste (GB 16889—2008); compared with chelator-stabilization, the environmental risk of Pb under W-D intermittent was significantly reduced. Therefore, cement and chelator co-treatment was suitable for the stabilization of Pb in MSWI fly ash in areas with high W-D intermittent incidence. |
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