Exploring key physicochemical sediment properties influencing bioleaching of heavy metals
Exploring key physicochemical sediment properties influencing bioleaching of heavy metals
复制标题
探索影响重金属生物浸出的关键沉积物理化特性
DOI：
10.1016/j.jhazmat.2022.130506
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发表时间：
2022
影响因子：
13.6
通讯作者：
Liping Lou
中科院分区：
文献类型：
--
作者：
Chuncheng Wu;Xinyi Hu;Haizhen Wang;Qi Lin;Chaofeng Shen;Liping Lou
生物浸出是一种很有前途的重金属污染沉积物修复技术。然而，沉积物复杂的非均质性会降低酸化效率和重金属去除率，从而阻碍了沉积物生物淋滤的实际应用。本试验对28种不同理化性质的沉积物进行了接种组（Cu 67.64%, Zn 54.44%, Ni 29.59%）与未接种组（Cu 37.10%, Zn 41.04%, Ni 19.89%）的生物浸出对比实验，探讨影响生物浸出的关键因素。结果表明，浸出过程以原生浸出菌为主，以接种菌为主。沉积物的吸酸能力（ACCpH=4）、总有机碳（TOC）和总氮（TN）对微生物群落结构和生物浸出性能的影响至关重要：ACCpH=4作为抑制因子，影响原生生物浸出菌的演替生长和接种量，而TOC和TN作为促进因子，影响原生生物浸出菌的代谢。在此基础上，通过对沉积物的分类和预处理，对生物浸出工艺进行了改进，实现了本研究中所有类型沉积物的成功生物浸出。
Bioleaching is a promising technology to remediate sediments contaminated by heavy metals. However, the complex heterogeneities of the sediments can reduce the acidification efficiency and the heavy metal removal rate, thus hindering the practical application of sediment bioleaching. This experiment conducted comparative bioleaching experiments between the inoculated group (average leaching percentages: Cu 67.64%; Zn 54.44%; Ni 29.59%) and the non-inoculated control group (Cu 37.10%; Zn 41.04%; Ni 19.89%) on 28 sediments characterized by different physicochemical properties to explore the key factors influencing bioleaching. The results indicated that the bioleaching process was predominated by the indigenous bioleaching bacteria and the bioleaching inoculum, respectively. The ACCpH=4(acid-consuming capacity), TOC (total organic carbon), and TN (total nitrogen) of the sediments played an essential role in influencing the microbial community structure and bioleaching performance: the ACCpH=4, as the inhibitive factor, could influence the succession growth of the indigenous bioleaching bacteria and the inoculum during the bioleaching process, while the TOC and TN, as the contributing factor, could influence the metabolism of the indigenous bioleaching bacteria. Based on these results, the bioleaching process was improved with the classification and pretreatments of sediment to realize successful bioleaching of all types of the sediments examined in this research.