Release behavior of heavy metals during treatment of dredged sediment by microwave-assisted hydrogen peroxide oxidation
Release behavior of heavy metals during treatment of dredged sediment by microwave-assisted hydrogen peroxide oxidation
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微波辅助过氧化氢氧化处理疏浚底泥过程中重金属的释放行为
DOI：
10.1016/j.cej.2014.07.098
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发表时间：
2014-12
影响因子：
15.1
通讯作者：
Zeng Guangming
中科院分区：
文献类型：
--
作者：
Wang Lele;Yuan Xingzhong;Zhong Hua;Wang Hou;Wu Zhibin;Chen Xiaohong;Zeng Guangming
化学氧化通常用于修复被有机污染物污染的河流沉积物，这可能会导致重金属的释放。然而，重金属释放的机制尚不完全清楚。在这项工作中，收集了中国湖南省下湾河的疏浚沉积物，并研究了微波辅助过氧化氢氧化（MW-H2O2）工艺处理的沉积物中重金属的释放行为。 Cu、Cd、Zn的释放效率在pH值0~4.0范围内保持稳定，当pH值高于4.0时，释放效率急剧下降。 H2O2浓度从0 M到0.2 M、Cd从0 M到0.1 M有利于提高Cu、Zn和Pb的释放效率。随着微波温度从 25°C 增加到 85°C、微波时间从 0 分钟增加到 6 分钟，Cu 和 Pb 的释放效率显着增加。经过MW-H2O2工艺处理后，沉积物中的金属具有更高的稳定性，从而降低了对环境的风险。
Chemical oxidation is often used to remediate river sediment contaminated with organic contaminants, which might cause the release of heavy metals. However, the mechanisms of the heavy metals release are not fully understood. In this work, dredged sediment was collected from Xiawan River in Hunan province, China, and the release behavior of heavy metals from the sediment treated with microwave-assisted hydrogen peroxide oxidation (MW-H2O2) process was investigated. The release efficiency of Cu, Cd and Zn was stable with pH varying from 0 to 4.0 and declined dramatically when the pH went higher than 4.0. H2O2was advantageous to improve the release efficiency for Cu, Zn and Pb with H2O2concentration from 0 M to 0.2 M, and from 0 M to 0.1 M for Cd. The release efficiency of Cu and Pb increased significantly with increasing microwave temperature from 25 °C to 85 °C and microwave time from 0 min to 6 min. After treatment by MW-H2O2process, the metals in the sediment have higher stability and thus lower risk to the environment.
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影响因子：
12.8
作者：
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通讯作者：
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作者：
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通讯作者：
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影响因子：
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作者：
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通讯作者：
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