Responses of microbial structures, functions and metabolic pathways for nitrogen removal to different hydraulic retention times in anaerobic side-stream reactor coupled membrane bioreactors
| Autor: | Xiaodan Zhao, Yi Zuo, Yuqing Ren, Yanjun Shao, Jie Jiang, Zhen Zhou, Ying An, Yue Zheng |
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| Rok vydání: | 2021 |
| Předmět: |
0106 biological sciences
Environmental Engineering Denitrification Hydraulic retention time Nitrogen chemistry.chemical_element Bioengineering 010501 environmental sciences Waste Disposal Fluid 01 natural sciences Denitrifying bacteria Bioreactors 010608 biotechnology Anaerobiosis Waste Management and Disposal Nitrogen cycle 0105 earth and related environmental sciences Sewage biology Renewable Energy Sustainability and the Environment Chemistry General Medicine biology.organism_classification Anoxic waters Environmental chemistry Nitrification Nitrospira Metabolic Networks and Pathways |
| Zdroj: | Bioresource Technology. 329:124903 |
| ISSN: | 0960-8524 |
| Popis: | Synchronous sludge reduction and nitrogen removal have attracted increasing attention, while the underlying mechanisms of diverse nitrogen metabolism within the complicated processes remain unclear. Four anoxic/oxic membrane bioreactors, three of which were upgraded by anaerobic side-stream reactors (ASSR) and carriers (APSSR-MBRs), were operated to determine effects of hydraulic retention time of ASSRs. APSSR-MBRs achieved more significant nitrogen removal and higher nitrate uptake rate because of more denitrifying bacteria and the supernumerary release of secondary substrates. Ammonia uptake rate showed the diverse Nitrospira preceded over anaerobic decay and sulfide inhibition in the ASSR, and made the reactor exhibit higher nitrification capacity. Metagenomic analysis indicated that APSSR-MBRs showed higher abundances of genes related to nitrogen consumption processes, and higher abundances on the carriers, confirming their pivotal roles in nitrogen metabolism. This study provided novel perspectives to build a bridge between process model and nitrogen metabolism in the sludge reduction system.. |
| Databáze: | OpenAIRE |
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