Adaptation and removal mechanism of anion chromium and cation cadmium by sulfate-reducing bacteria culture systems under different carbon sources
Adaptation and removal mechanism of anion chromium and cation cadmium by sulfate-reducing bacteria culture systems under different carbon sources
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不同碳源下硫酸盐还原菌培养体系对阴离子铬、阳离子镉的适应及去除机制
DOI：
10.1016/j.jece.2023.109470
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发表时间：
2023
影响因子：
7.7
通讯作者：
Caihong Yu
中科院分区：
文献类型：
--
作者：
Suya Ma;Qiancheng Zhao;Yanbin Du;Xuesong Hu;Jiale Zhang;Huadong Tan;Fuyuan Qiu;Caihong Yu
限制硫酸盐还原菌培养系统（SRB）去除重金属的一个主要因素是需要提供碳和能量来驱动该过程。本研究综合考察了Cr（VI）和Cd（II）驯化条件下不同碳源对SRB的影响，并选取腐殖酸和乳酸钠两种优势碳源对SRB的转化机理进行了研究。结果表明，各碳源利用率顺序为：腐殖酸>乳酸钠>甘油>混合碳源>葡萄糖。不同的碳源利用率和程度导致了不同的SRB的多样性，结构和功能。碳源的差异可导致某些功能的增加或减少，例如，在腐殖酸组中，固氮作用增强。发酵细菌在将大量有机物降解为挥发性脂肪酸，然后被SRB利用以还原硫酸盐中起关键作用。对于阴离子Cr（VI），SRB培养体系主要通过H2S途径将Cr（VI）还原为Cr（III）;对于阳离子Cd（II），EPS途径、电子传递途径和H2S途径均有较好的去除效果。这些发现为菌株筛选和重金属去除提供了新的视角。
A major factor limiting the application of sulfate-reducing bacteria culture systems (SRBs) to the removal of heavy metals is the requirement to supply carbon and energy to drive the process. In this study, the effects of carbon sources on the SRBs under Cr(VI) and Cd(II) domestication conditions were comprehensively investigated, and two dominant groups with humic acid and sodium lactate as carbon sources were selected to study the mechanisms of transformation. Results showed that the order of carbon source utilization was humic acid > sodium lactate > glycerol > mixed carbon sources > glucose. Differences in the rate and extent of utilization of carbon sources resulted in different diversity, structure, and function of SRBs. Differences in carbon sources can lead to an increase or decrease in certain functions, e.g., nitrogen fixation is enhanced in the humic acid group. The fermentative bacteria play a key role in degrading macro-organics to volatile fatty acids, which are then utilized by SRBs to reduce sulfate. For the anion Cr(VI), the SRBs culture system reduced Cr(VI) to Cr(III) mainly through the H2S pathway; for the cation Cd(II), the EPS pathway, electron transport pathway, and H2S pathway all had good removal effects. These findings provide a new perspective on strain screening and heavy metal removal.
影响因子：
2.2
作者：
Otaki H;Everroad RC;Matsuura K;Haruta S
通讯作者：
Haruta S