Changes in heavy metal mobility and availability from contaminated wetland soil remediated with combined biochar-compost

文献类型: 外文期刊

第一作者: Liang, Jie

作者: Liang, Jie;Yang, Zhaoxue;Tang, Lin;Zeng, Guangming;Li, Xiaodong;Qian, Yingying;Li, Xuemei;Luo, Yuan;Liang, Jie;Yang, Zhaoxue;Tang, Lin;Zeng, Guangming;Li, Xiaodong;Qian, Yingying;Li, Xuemei;Luo, Yuan;Yu, Man;Wu, Haipeng

作者机构:

关键词: Wetland soil;Heavy metals;Combined biochar-compost;Soil physicochemical properties;Availability;Speciation distribution

期刊名称:CHEMOSPHERE ( 影响因子:7.086; 五年影响因子:6.956 )

ISSN:

年卷期:

页码:

收录情况: SCI

摘要: The combination of biochar and compost has been proven to be effective in heavy metals contaminated wetland soil restoration. However, the influence of different proportions between biochar and compost on immobilization of heavy metals in soil has been less studied up to date. Therefore, we investigated the effect of different ratios of biochar-compost mixtures on availability and speciation distribution of heavy metals (Cd, Zn and Cu) in wetland soil. The results showed that applying all amendment combinations into wetland soil increased gradually the total organic carbon (TOC) and water-extract organic carbon (WEOC) as the compost percentage rose in biochar-composts. The higher pH was obtained in a certain biochar addition (20% and 40%) in combinations due to efficient interaction of biochar with compost. All amendments could significantly decrease availability of Cd and Zn mainly from pH change, but increase available Cu concentration as the result of increased water-extract organic carbon and high total Cu content in compost. Moreover, amendments can decrease easily exchangeable fraction and increase reducible of Cd and Zn greatly with increase of compost content in combinations, while amendments containing compost promote transformation of Cu from Fe/Mn oxide and residual fractions to organic bindings. These results demonstrate that different ratios of biochar and compost have a significant effect on availability and speciation of heavy metals in multi-metal-contaminated wetland soil. (C) 2017 Elsevier Ltd. All rights reserved.

分类号: X5

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