硝化作用
反硝化细菌
好氧反硝化
异养
反硝化
自养
环境化学
化学
缺氧水域
生物膜
氮气循环
废水
氮气
环境工程
细菌
生物
环境科学
有机化学
遗传学
作者
Ziyuan Lin,Jian Zhou,Lei He,Xuejie He,Zhanglei Pan,Yingmu Wang,Qiang He
标识
DOI:10.1016/j.biortech.2021.126184
摘要
Conventional autotrophic nitrification process is difficult to treat high-temperature wastewater with high-strength ammonia. In this study, a high-temperature (50 °C) biofilm system based on heterotrophic nitrification and aerobic denitrification (HNAD) was established. The results showed that the HNAD process was high temperature resistant, and the nitrogen removal performance, pathway and microbial mechanism varied remarkably at different temperatures. The high-temperature system showed excellent nitrogen and COD removal capacities at 50 °C. Ammonia oxidation was mainly undertaken by heterotrophic nitrification, while anoxic and aerobic pathways worked in concert for denitrification. High-throughput sequencing indicated that heterotrophic nitrifying bacteria (8.58%) and denitrifying bacteria (52.88%) were dominant at 50 °C. Metagenomic analysis further suggested that the carbon metabolism was up-regulated in response to the increasing temperature, so more energy was generated, thereby promoting the HNAD-related nitrogen removal pathways. The study revealed the microbial mechanism of HNAD at high temperature and provided new insights into high-temperature biological nitrogen removal.
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