| Reinforcement of denitrification in a biofilm electrode reactor with immobilized polypyrrole/anthraquinone-2,6-disulfonate composite cathode | |
Zhai, Siyuan ; Cheng, Haoyi; Wang, Qian; Zhao, Yingxin; Wang, Aijie; Ji, Min
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| 2022-08-01 | |
| Source Publication | JOURNAL OF ENVIRONMENTAL MANAGEMENT
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| ISSN | 0301-4797 |
| Volume | 315Issue:0Pages:115203 |
| Abstract | In biofilm electrode reactors (BER), good nitrate removal performance can be achieved through cooperation of heterotrophic and hydrogen autotrophic denitrification under low carbon/nitrogen conditions. In this study, we proposed a more multifunctional composite cathode, which combine immobilized anthraquinone-2,6-disulphonic disodium salt (AQDS) with polypyrrole (PPy) by electrochemical polymerization-doping method. The nitrate removal performance in BER with PPy/AQDS composite cathode was obviously improved, the nitrate removal rate (4.96 mg/L.h) was almost 2.0 times higher than the control BER system, and relatively stabled nitrate removal efficiency (& GE;90.0%) was also achieved even as the COD/N of 2.50. Compared with the bare graphite felt, PPy/AQDS coating cathode showed much better electrocatalytic activities, which was more advantageous for in situ production of H-2 to support hydrogen autotrophic denitrification process. The PPy-bound AQDS could also act as electron intermediaries, which is beneficial to greatly promote indirect electron process between the denitrifiers and nitrate. Moreover, the PPy/AQDS composite layer formed many particles for improving the specific surface area and bio-attachment site for bacterial attachment, which was conducive for the proliferation of microorganisms and denitrification efficiency. The ratio of biofilm and electrode of PPy/ AQDS biocathode was 0.32 & PLUSMN; 0.08, which was 2.46 times than bare electrode (0.13 & PLUSMN; 0.06). Furthermore, enrichment of specific denitrifiers and enhancement of denitrifying enzyme activity was obtained using PPy/ AQDS treated electrode, the much higher relative abundance of Thauera of PPy/AQDS biocathode was 1.58 times to the application of bare graphite felt. |
| Department | 中国科学院环境生物技术重点实验室 ; 中国科学院环境生物技术重点实验室 |
| Keyword | NITROGEN REMOVAL PERFORMANCE WASTE-WATER REDOX MEDIATORS AUTOTROPHIC DENITRIFICATION CONSTRUCTED WETLAND NITRATE REMOVAL COMMUNITY OPTIMIZATION REDUCTION BACTERIA |
| Document Type | 期刊论文 |
| Identifier | https://ir.rcees.ac.cn/handle/311016/47812 |
| Collection | 中国科学院环境生物技术重点实验室 |
| Corresponding Author | Zhao, Yingxin |
| Affiliation | 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.Harbin Inst Technol Shenzhen, Sch Civil & Environm Engn, Shenzhen 518055, Peoples R China |
| Recommended Citation GB/T 7714 | Zhai, Siyuan,Cheng, Haoyi,Wang, Qian,et al. Reinforcement of denitrification in a biofilm electrode reactor with immobilized polypyrrole/anthraquinone-2,6-disulfonate composite cathode[J]. JOURNAL OF ENVIRONMENTAL MANAGEMENT,2022,315(0):115203. |
| APA | Zhai, Siyuan,Cheng, Haoyi,Wang, Qian,Zhao, Yingxin,Wang, Aijie,&Ji, Min.(2022).Reinforcement of denitrification in a biofilm electrode reactor with immobilized polypyrrole/anthraquinone-2,6-disulfonate composite cathode.JOURNAL OF ENVIRONMENTAL MANAGEMENT,315(0),115203. |
| MLA | Zhai, Siyuan,et al."Reinforcement of denitrification in a biofilm electrode reactor with immobilized polypyrrole/anthraquinone-2,6-disulfonate composite cathode".JOURNAL OF ENVIRONMENTAL MANAGEMENT 315.0(2022):115203. |
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