Stabilization of As(Ⅴ) in contaminated sediment by FeMnMg-LDH
ZHOU Hong-guang1, GAN Yan-ping1, WU De-quan2, YANG Yan-mei1, ZHANG Yang3, WANG Lu-yao3
1. National Engineering Research Center for Inland Waterway Regulation, Chongqing Jiaotong University, Chongqing 400074, China; 2. Qianxinan Radio and Television University, Xingyi 562400, China; 3. Shaanxi Province Land Engineering Construction Group, Xi'an 710075, China
Abstract:To address the problem of stabilized remediation of dredged sediment, FeMnMg-LDH materials were prepared by an improved co-precipitation method to achieve passivation of As in the sediment. The effect of FeMnMg-LDH on the passivation of As in dredged sediment under different As contamination levels and humic acid (HA) addition through sediment incubation tests was investigated. The results showed that the FeMnMg-LDH material induced the transformation of mild acido-soluble fraction arsenic (MASF-As) to a more stable form. With the increase of FeMnMg-LDH addition level, the leaching concentration of As in the sediment at high contamination level (250mg/kg As) was reduced to 261.35 μg/L, the stabilization efficiency was up to 80.29%, and the percentage of effective state content decreased from 13.24% to 3.21% (3.0% FeMnMg-LDH addition level). The addition of HA had a certain activation effect on As in the sediment, which increased the leaching toxicity and biological effectiveness of As in the sediment. The activation effect brought by HA could be weakened by FeMnMg-LDH passivation remediation at the activation effect brought by HA was gradually weakened with the increase of the addition amount at the restorer addition levels of 0%~3.0%. The results of correlation analysis showed that the leaching toxicity and bioeffectiveness of sediment As were positively correlated with the percentage of MASF-As and negatively correlated with the percentage of reducible arsenic (RF-As), which indicated that FeMnMg-LDH materials reduced the leaching toxicity and bioeffectiveness of As by changing the morphological distribution of As in the sediment. In conclusion, FeMnMg-LDH can be used as a passivating agent for As in substrates, providing new materials and methods for the passivation remediation of heavy metals in sediment.
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