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The Effect of Wet Treatment on the Distribution and Leaching of Heavy Metals and Salts of Bottom Ash from Municipal Solid Waste Incineration
Environmental Engineering Science ( IF 1.8 ) Pub Date : 2022-05-16 , DOI: 10.1089/ees.2021.0065 Yonghao Zhu 1 , Yanjun Hu 1 , Qianqian Guo 1 , Lingqin Zhao 1 , Lianming Li 2 , Yihong Wang 2 , Guixiang Hu 1 , Haryo Wibowo 1 , Francesco Di Maio 3
Environmental Engineering Science ( IF 1.8 ) Pub Date : 2022-05-16 , DOI: 10.1089/ees.2021.0065 Yonghao Zhu 1 , Yanjun Hu 1 , Qianqian Guo 1 , Lingqin Zhao 1 , Lianming Li 2 , Yihong Wang 2 , Guixiang Hu 1 , Haryo Wibowo 1 , Francesco Di Maio 3
Affiliation
One of the main challenges of bottom ash reutilization is heavy metal and salts' leaching potential. The effect of wet treatment on chemical composition and leaching toxicity of bottom ash were investigated in this study to mitigate this leaching potential. Batch leaching and column leaching tests were first conducted to investigate the leaching behavior of the targeted elements (Cu, Zn, Ni, Cl−, and SO42−) from raw bottom ash and treated bottom ash after wet treatment. X-ray fluorescence analysis was used to analyze the chemical composition of bottom ash, and sequential extraction procedure (SEP) operation was done to analyze the chemical species of the heavy metals of bottom ash. The obtained results showed that the wet treatment applied on raw bottom ash posed a slight influence on the concentration of most of the major elements, 5.57–18.18%. SEP results showed the acid extractable Zn that accounted for 22.4–24.5% of the total Zn, and the iron manganese oxide bound Ni was 25.2–28.4%, and the organic matter bound Cu was 21.4–31.7%. The wet treatment reduced the concentrations and leachable amount of the targeted pollutants, which could decrease the leaching concentration of Cu by 77.1%, Zn by 34.7%, Ni by 100%, Cl by 30.1%, and SO42− by 51.4% based on the batch leaching tests under acid condition. The column leaching tests also suggest that wet treatment decreases Cu, Zn, and Cl− leaching concentration in bottom ash. This indicates that wet treatment improves the suitability of municipal solid waste incineration bottom ash for reutilization in China.
中文翻译:
湿法处理对城市生活垃圾焚烧底灰重金属和盐类分布及浸出的影响
底灰再利用的主要挑战之一是重金属和盐的浸出潜力。本研究研究了湿法处理对底灰化学成分和浸出毒性的影响,以减轻这种浸出潜力。首先进行了批量浸出和柱浸出试验,以研究目标元素(Cu、Zn、Ni、Cl -和 SO 4 2-) 来自原始底灰和湿处理后的处理底灰。采用X射线荧光分析法分析底灰的化学成分,采用顺序萃取法(SEP)分析底灰中重金属的化学形态。所得结果表明,湿处理对生底灰的大部分主要元素的浓度(5.57-18.18%)有轻微影响。SEP结果表明,酸浸锌占总Zn的22.4-24.5%,铁锰氧化物结合Ni为25.2-28.4%,有机物结合Cu为21.4-31.7%。湿法处理降低了目标污染物的浓度和可浸出量,可降低Cu的浸出浓度77.1%、Zn的浸出浓度34.7%、Ni的浸出浓度100%、Cl的浸出浓度30.1%、SO的浸出浓度。4 2- 51.4% 基于酸性条件下的批量浸出测试。柱浸出试验还表明,湿法处理降低了底灰中铜、锌和氯的浸出浓度。这表明湿法处理提高了我国城市生活垃圾焚烧底灰的再利用适用性。
更新日期:2022-05-17
中文翻译:
湿法处理对城市生活垃圾焚烧底灰重金属和盐类分布及浸出的影响
底灰再利用的主要挑战之一是重金属和盐的浸出潜力。本研究研究了湿法处理对底灰化学成分和浸出毒性的影响,以减轻这种浸出潜力。首先进行了批量浸出和柱浸出试验,以研究目标元素(Cu、Zn、Ni、Cl -和 SO 4 2-) 来自原始底灰和湿处理后的处理底灰。采用X射线荧光分析法分析底灰的化学成分,采用顺序萃取法(SEP)分析底灰中重金属的化学形态。所得结果表明,湿处理对生底灰的大部分主要元素的浓度(5.57-18.18%)有轻微影响。SEP结果表明,酸浸锌占总Zn的22.4-24.5%,铁锰氧化物结合Ni为25.2-28.4%,有机物结合Cu为21.4-31.7%。湿法处理降低了目标污染物的浓度和可浸出量,可降低Cu的浸出浓度77.1%、Zn的浸出浓度34.7%、Ni的浸出浓度100%、Cl的浸出浓度30.1%、SO的浸出浓度。4 2- 51.4% 基于酸性条件下的批量浸出测试。柱浸出试验还表明,湿法处理降低了底灰中铜、锌和氯的浸出浓度。这表明湿法处理提高了我国城市生活垃圾焚烧底灰的再利用适用性。