硝化作用
异养
无氧运动
硝化细菌
化学
废水
碳纤维
环境化学
氮气
好氧反硝化
氮气循环
厌氧菌
细菌
反硝化
反硝化细菌
环境工程
生物
环境科学
有机化学
材料科学
复合数
复合材料
遗传学
生理学
作者
Ming Yang,Dongwei Lu,Jia-Xuan Yang,Yumeng Zhao,Qi Zhao,Yan Sun,Huiling Liu,Jun Ma
出处
期刊:Chemosphere
[Elsevier]
日期:2019-11-01
卷期号:234: 162-170
被引量:22
标识
DOI:10.1016/j.chemosphere.2019.06.052
摘要
In this study, both the carbon and nitrogen metabolisms of two heterotrophic nitrification bacteria were investigated under aerobic and anaerobic conditions at 2 °C. Similar catabolism and anabolism trends were observed for the two bacteria in stable experimental systems under aerobic and anaerobic conditions. Based on the nitrogen and carbon balance analysis and adenosine triphosphate (ATP) calculation, we proposed the following metabolic pathways: i) aerobic: except for microbial assimilation, the carbon and nitrogen sources were removed through respiration and nitrification, which provided energy for cell synthesis; and ii) anaerobic: the nitrification process almost stopped and most of the carbon sources decomposed into inorganic carbon, which dissolved in the medium. Based on our proposed metabolic pathways, we speculated that the nitrifying process almost stopped under anaerobic conditions and the nitrification bacteria would degrade more carbon contaminants to produce energy and maintain the cell growth. Furthermore, these bacteria may decompose the non-readily biodegradable carbon through anaerobic degradation. To verify these hypotheses, experiments with two types of synthetic wastewater were conducted: i) synthetic wastewater rich in carbon and poor in nitrogen, and higher carbon removal efficiencies of strain J and strain P (∼25%) were obtained under anaerobic conditions compared with aerobic conditions (∼19%); and ii) synthetic wastewater with recalcitrant carbon sources, and carbon removal efficiencies under anaerobic conditions were higher than those under aerobic conditions. The results of the synthetic wastewater experiments were consistent with the hypotheses and thus validated the metabolic pathways proposed for carbon and nitrogen.
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