Influence of Fe3O4 on the anaerobic treatment system of saline wastewater
MA Kai-li, WANG Wei, LIU Yu-qing, YAN Meng-yi, CUI Yan-rui, KANG Wei, CAO Zhi-guo
Henan Key Laboratory for Environmental Pollution Control, Key Laboratory of Yellow River and Huai River Water Environment and Pollution Control, Ministry of Education, School of Environment, Henan Normal University, Xinxiang 453007, China
Abstract：The salinity was stepwise increased at fixed hydraulic retention time of 24h, two parallel anaerobic reactors with and without Fe3O4 were applied to investigate the influence of Fe3O4 on operational performance and sludge granulation of anaerobic system. The addition of Fe3O4 could effectively enhance the anaerobic treatment efficiency and ensure the stable operation at all tested salinity. The improvement of Fe3O4 on methane yield differed significantly at salinity varying from 0~2%. At salinity of 0, 0.5%, 1% and 2%, the methane yield of Fe3O4-supplemented reactor was 1.08, 1.36, 1.3 and 1.17-fold of the contrast reactor, the enhancement of Fe3O4 on methane yield was more significant under low salinity. In addition, the sludge properties and extracellular polymer substances secretion during the operation process were simultaneously analyzed as well. The results showed that the addition of Fe3O4 facilitated the formation of closely-packed anaerobic granular sludge, thus enhanced the anaerobic granulation process. According to the microbial community structure analysis, hydrogenotrophic methanogens were rapidly enriched with the increase of salinity, while the main bacterial consortium and metabolic pathways were changed as well. The effects of Fe3O4 on the microbial community structure and metabolic pathway of anaerobic system were also observed obviously distinct under low salinity (0.5%) and high salinity (1%, 2%).
马凯丽, 王威, 刘雨晴, 严梦怡, 崔延瑞, 康威, 曹治国. Fe3O4对含盐废水厌氧处理系统的影响[J]. 中国环境科学, 2022, 42(11): 5128-5135.
MA Kai-li, WANG Wei, LIU Yu-qing, YAN Meng-yi, CUI Yan-rui, KANG Wei, CAO Zhi-guo. Influence of Fe3O4 on the anaerobic treatment system of saline wastewater. CHINA ENVIRONMENTAL SCIENCECE, 2022, 42(11): 5128-5135.
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