Effects of Cr6+ stress on chromium chemical speciation distribution and bacterial community structure in the Coix lacryma-jobi L. constructed wetlands

IF 3.6 4区环境科学与生态学 Q2 BIOCHEMISTRY & MOLECULAR BIOLOGY Environmental Pollutants and Bioavailability Pub Date : 2022-09-27 DOI:10.1080/26395940.2022.2128427

Zirui Fang, Qianyun Wang, Cunqi Zhang, Sulian Li, Shuai Li, Xueli Wang, Xiran Cheng, Zhenli He, Zhigang Li

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引用次数: 1

Abstract

ABSTRACT In this study, micro Coix lacryma-jobi L. vertical flow constructed wetlands with 0, 10 and 30 mg/L Cr6+ (in the form of K2Cr7O2) in the water sources were constructed to study the purification efficiency of chromium-contaminated wastewater, bacterial community diversity, chromium chemical speciation distribution and other indicators. The results showed that the constructed wetlands had high purification efficiency for chromium-contaminated wastewater. The removal rate of Cr6+ reached 99.61% and 95.45% in 10 and 30 mg/L Cr6+ treatment. The bacterial diversity index was unaffected by Cr6+ treatment; however, the bacterial richness index declined dramatically as Cr6+ treatment concentration increased. The bacterial community structure was influenced by the substrates pH, moisture content, organic matter and total chromium content. The abundance of Burkholderiaceae (uncultured) and Saccharimonadales (uncultured) were positively correlated with non-residual chromium content. The results contributed to understand the effect of chromium on bacterial community structure by considering the chromium chemical speciation.

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Cr6+胁迫对人工湿地铬化学形态分布及细菌群落结构的影响

摘要本研究通过在水源中构建0、10、30 mg/L Cr6+(以K2Cr7O2的形式)垂直流人工湿地，研究其对铬污染废水的净化效果、细菌群落多样性、铬化学形态分布等指标。结果表明，人工湿地对含铬废水具有较高的净化效果。10和30 mg/L Cr6+的去除率分别为99.61%和95.45%。细菌多样性指数不受Cr6+处理的影响;但随着Cr6+处理浓度的增加，细菌丰富度指数显著下降。细菌群落结构受基质pH、含水量、有机质和总铬含量的影响。burkholderaceae(未培养)和Saccharimonadales(未培养)的丰度与非残留铬含量呈正相关。研究结果有助于从铬的化学形态角度了解铬对细菌群落结构的影响。

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来源期刊

Environmental Pollutants and Bioavailability Chemical Engineering-Chemical Health and Safety

CiteScore

4.30

自引率

3.00%

发文量

审稿时长

13 weeks

期刊介绍： Environmental Pollutants & Bioavailability is a peer-reviewed open access forum for insights on the chemical aspects of pollutants in the environment and biota, and their impacts on the uptake of the substances by living organisms. Topics include the occurrence, distribution, transport, transformation, transfer, fate, and effects of environmental pollutants, as well as their impact on living organisms. Substances of interests include heavy metals, persistent organic pollutants, and emerging contaminants, such as engineered nanomaterials, as well as pharmaceuticals and personal-care products as pollutants.