Chemical Industry and Engineering Progress ›› 2023, Vol. 42 ›› Issue (9): 4917-4928.DOI: 10.16085/j.issn.1000-6613.2022-1857

• Resources and environmental engineering • Previous Articles     Next Articles

Leaching behavior of heavy metals from broken ton bags filled with fly ash in acid rain environment

LI Weihua1,2(), YU Qianwen1, YIN Junquan1, WU Yinkai1, SUN Yingjie1(), WANG Yan1, WANG Huawei1, YANG Yufei2, LONG Yuyang3, HUANG Qifei2, GE Yanchen1, HE Yiyang1, ZHAO Lingyan1   

  1. 1.Qingdao Solid Waste Pollution Control and Resource Engineering Research Center, School of Environmental and Municipal Engineering, Qingdao University of Technology, Qingdao 266520, Shandong, China
    2.State Environmental Protection Key Laboratory of Hazardous Waste Identification and Risk Control, Chinese Research Academy of Environmental Sciences, Beijing 100012, China
    3.Zhejiang Provincial Key Laboratory of Solid Waste Treatment and Recycling, College of Environmental Science and Engineering, Zhejiang Gongshang University, Hangzhou 310012, Zhejiang, China
  • Received:2022-10-08 Revised:2022-11-24 Online:2023-09-28 Published:2023-09-15
  • Contact: SUN Yingjie

酸雨环境下填埋飞灰吨袋破损后重金属的溶出行为

李卫华1,2(), 于倩雯1, 尹俊权1, 吴寅凯1, 孙英杰1(), 王琰1, 王华伟1, 杨玉飞2, 龙於洋3, 黄启飞2, 葛燕辰1, 何依洋1, 赵灵燕1   

  1. 1.青岛理工大学环境与市政工程学院,青岛市固体废物污染控制与资源化工程研究中心,山东 青岛 266520
    2.中国环境科学研究院,国家环境保护危险废物鉴别与风险控制重点实验室,北京 100012
    3.浙江工商大学环境科学与工程学院,浙江省固体废物处理与资源化重点实验室,浙江 杭州 310012
  • 通讯作者: 孙英杰
  • 作者简介:李卫华(1989—),男,副教授,研究方向为垃圾焚烧飞灰污染控制与资源化。E-mail:liweihua@qut.edu.cn
  • 基金资助:
    国家自然科学基金(52000111);山东省博士后创新项目(202103026);国家环境保护危险废物鉴别与风险控制重点实验室开放基金(2022YSKY-06);山东省高等学校青年创新团队人才引育计划;浙江省固体废物处理与资源化重点实验室开放基金(SWTR-2021-01);青岛市博士后应用研究项目(2020年7月);山东省大学生创新创业训练项目(S202210429003)

Abstract:

The column leaching experiment of stabilized fly ash was established by simulating acid rain with “sulfuric acid + nitric acid” extractant to study the influence of acid rain seepage path on the leaching behavior of heavy metals in fly ash under the condition of damaged fly ash ton bags in the landfill. The results showed that the six seepage paths all promoted the leaching of Pb, Zn, Cu, Cd, Cr and Ni in stabilized fly ash to varying degrees. Compared with the horizontal seepage path of “upper left inflow-lower right outflow”, the vertical seepage path of “upper inflow - lower outflow” was more likely to promote the leaching of heavy metals in fly ash due to the double influence of gravity potential energy and matrix potential. Under the mode of “dynamic scouring + static soaking + dynamic scouring”, the cumulative leaching amount of heavy metals was higher. Under the seepage path of “upper left inflow-upper right outflow”, the fluctuation of pH of leachate was the smallest, the cumulative leaching amount of heavy metals was the lowest, and the stability of heavy metals in fly ash matrix was the best. The research results could provide a scientific basis for the evaluation of the leaching behavior of heavy metals from stabilized fly ash in extreme acid rain environment and the environmental risk management and control when the fly ash ton bag in the actual landfill was damaged.

Key words: fly ash landfill, broken ton bag, acid rain, seepage path, heavy metal leaching

摘要:

采用“硫酸+硝酸”型浸提剂模拟酸雨,建立稳定化飞灰柱式浸沥实验,研究填埋场飞灰吨袋破损情况下酸雨渗流路径对飞灰中重金属溶出行为的影响。结果表明:6种渗流路径均不同程度促进稳定化飞灰中Pb、Zn、Cu、Cd、Cr和Ni的溶出。受到重力势能和基质势的双重影响,相比“左上进水-右下出水”的横向渗流路径,“上进水-下出水”的纵向渗流路径更容易促使飞灰中重金属的溶出;“动态冲刷+静态浸泡+动态冲刷”模式下重金属的累计浸出总量更高;“左上进水-右上出水”渗流路径下,浸出液pH变化波动最小,重金属累计浸出量最低,飞灰基质赋存重金属的稳定性最佳。研究结果可为实际填埋场飞灰吨袋破损时极端酸雨环境对填埋稳定化飞灰中重金属溶出行为评价及环境风险管控提供科学依据。

关键词: 飞灰填埋, 吨袋破损, 酸雨, 渗流路径, 重金属溶出

CLC Number: 

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