研究报告
麻微微,施雪卿,孔巧平,于童,赵飞,赵丹丹.微电解耦合同步硝化反硝化工艺强化煤化工废水脱氮效能及微生物群落结构研究[J].环境科学学报,2022,42(3):130-140
微电解耦合同步硝化反硝化工艺强化煤化工废水脱氮效能及微生物群落结构研究
- Nitrogen removal efficiency and microbial community characteristics in microelectrolysis coupled simultaneous nitrification and denitrification process for coal chemical wastewater treatment
- 基金项目：山东省自然科学基金青年项目（No.ZR2020QE236）；山东省高等学校“青创科技计划”（No.2020KJD003）
- 作者
- 单位
- 麻微微
- 青岛理工大学，环境与市政工程学院，青岛 266033
- 施雪卿
- 青岛理工大学，环境与市政工程学院，青岛 266033
- 孔巧平
- 青岛理工大学，环境与市政工程学院，青岛 266033
- 于童
- 青岛理工大学，环境与市政工程学院，青岛 266033
- 赵飞
- 青岛理工大学，环境与市政工程学院，青岛 266033
- 赵丹丹
- 青岛理工大学，环境与市政工程学院，青岛 266033
- 摘要：研究探讨微电解耦合同步硝化反硝化（ICME-SND）工艺对煤化工废水氮去除的强化效能及机理.结果表明，在ICME-SND工艺中，煤化工废水的COD、氨氮和总氮的去除率分别为85.99%、85.81%和75.59%，SND效率达到83.06%，显著高于非强化SND工艺.同时，ICME-SND工艺中活性污泥与微电解反应释放的铁离子相结合，污泥胞外聚合物（EPS）含量提高，其中紧密型EPS（TB-EPS）占EPS总量的68.39%.微电解反应有效提高SND系统内微生物群落多样性.ICME-SND工艺中硝化细菌与反硝化细菌共存，其中硝化细菌主要包括Nitrosospira、Nitrosomonas和Nitrospira；反硝化细菌成为系统内的优势菌属，主要包括兼性厌氧反硝化菌Thauera与自养反硝化菌Adoxiviro.此外，Geothrix和Geobacter等铁营养型细菌被富集.因此，ICME-SND工艺内形成自养硝化、异养反硝化和自养反硝化共存的氮代谢体系.本研究结果为煤化工废水生物脱氮技术的优化调控提供理论依据和技术支撑.
- Abstract：The iron-carbon microelectrolysis coupled simultaneous nitrification and denitrification （ICME-SND） process was established for enhancing the nitrogen removal efficiency in coal chemical wastewater. The results showed that the removal efficiency of COD， ammonia and total nitrogen in ICME-SND was 85.99%， 85.81% and 75.59%， respectively. And the SND efficiency reached 83.06%， which was significantly higher than that of non-strengthening SND process. Meanwhile， activated sludge was combined with iron ions released by microelectrolysis reaction in ICME-SND. The extracellular polymer （EPS） concentration of activated sludge increased， in which tightly bound EPS （TB-EPS） accounted for 68.39%. Furthermore， the microelectrolysis reaction significantly improved the microbial community diversity in the SND system. The nitrifying bacteria and denitrifying bacteria co-excited in ICME-SND. The main nitrifying bacteria were Nitrosospira、Nitrosomonas and Nitrospira. The denitrifying bacteria were the dominant genera， including facultative anaerobic denitrifying bacteria Thauera and autotrophic denitrifying bacteria Adoxiviro. Besides， iron-reducing bacteria Geothrix and Geobacter were enriched. Therefore， a nitrogen metabolism system with autotrophic nitrification， heterotrophic denitrification and autotrophic denitrification was formed in ICME-SND. These results will provide theoretical reference and technical support for the optimization of biological nitrogen removal technology in coal chemical wastewater treatment.
- Key words：simultaneous nitrification and denitrification microelectrolysis coal chemical wastewater microbial community
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