Rapid recovery of inhibited denitrification with cascade Cr(VI) exposure by bio-accelerant: Characterization of chromium distributions, EPS compositions and denitrifying communities
文献类型：期刊论文
| 作者 | Zhou, Xu; Zhai, Siyuan; Zhao, Yingxin; Liu, Duo; Wang, Qian; Ji, Min |
| 刊名 | JOURNAL OF HAZARDOUS MATERIALS
 |
| 出版日期 | 2021-06-05 |
| 卷号 | 411页码:- |
| 关键词 | Denitrification performance Chromium (VI) Cascade impact Biological accelerant Recovery behavior |
| ISSN号 | 0304-3894 |
| 英文摘要 | Hexavalent chromium (Cr(VI)) may inhibit denitrification in biological wastewater treatment systems, and the inhibited denitrification process is difficult to recover in a short time. This study explored Cr(VI) cascade impact (20?125 mg L-1) on denitrification and developed one nontoxic biological accelerant (combination of L-cysteine, flavin adenine dinucleotide, biotin and cytokinin) for denitrification recovery. The results showed that NO3- -N removal efficiency decreased from 75.7% to 21.5% when Cr(VI) concentration increased from 80 to 125 mg L-1. Addition of accelerant could effectively promote the removal of NO3- -N, and observably reduce the recovery time (42 T) compared with natural recovery (63 T). Furthermore, the main site of Cr(VI) reduction and Cr(III) immobilization was located in the intercellular compartment of the biofilm. Microbes produced more tightly bound extracellular polymeric substances (TB-EPS) to protect them from toxicity under the low Cr(VI) concentrations, while low EPS was secreted when Cr(VI) concentration was higher than 60 mg L-1. Compared to natural recovery system, bio-accelerant addition was beneficial to the recovery of denitrifiers activities, especially for the bacteria containing nirS gene. The results facilitated an understanding of Cr(VI) impact on denitrification, and the proposed bio-accelerant can be potentially applied to heavy metal shock-loading emergency situations. |
| WOS研究方向 | Engineering, Environmental ; Environmental Sciences |
| 源URL | [http://ir.rcees.ac.cn/handle/311016/46142]  |
| 专题 | 生态环境研究中心_中国科学院环境生物技术重点实验室 |
| 作者单位 | 1.Tianjin Univ, Sch Environm Sci & Engn, Tianjin 300350, Peoples R China 2.Chinese Acad Sci, Res Ctr Ecoenvironm Sci, Beijing 100085, Peoples R China 3.Ninth Waterworks Beijing Waterworks Grp Co Ltd, Beijing 100012, Peoples R China |
| 推荐引用方式 GB/T 7714 | Zhou, Xu,Zhai, Siyuan,Zhao, Yingxin,et al. Rapid recovery of inhibited denitrification with cascade Cr(VI) exposure by bio-accelerant: Characterization of chromium distributions, EPS compositions and denitrifying communities[J]. JOURNAL OF HAZARDOUS MATERIALS,2021,411:-. |
| APA | Zhou, Xu,Zhai, Siyuan,Zhao, Yingxin,Liu, Duo,Wang, Qian,&Ji, Min.(2021).Rapid recovery of inhibited denitrification with cascade Cr(VI) exposure by bio-accelerant: Characterization of chromium distributions, EPS compositions and denitrifying communities.JOURNAL OF HAZARDOUS MATERIALS,411,-. |
| MLA | Zhou, Xu,et al."Rapid recovery of inhibited denitrification with cascade Cr(VI) exposure by bio-accelerant: Characterization of chromium distributions, EPS compositions and denitrifying communities".JOURNAL OF HAZARDOUS MATERIALS 411(2021):-. |
入库方式： OAI收割
来源：生态环境研究中心
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