Influence of Light Irradiation on Nitrification in Microalgal-Bacterial Systems for Treating Wastewater

文献类型： 外文期刊

第一作者： Lu, Shimin

作者： Lu, Shimin;Li, Yayuan;Liu, Xingguo;Cheng, Guofeng;Yuan, Zehui;Wu, Fan;Lu, Shimin;Liu, Xingguo;Cheng, Guofeng;Wu, Fan;Li, Yayuan;Yuan, Zehui

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关键词： photoinhibition; light resistance; ammonia-oxidizing bacteria (AOB); nitrite-oxidizing bacteria (NOB); nitrifying granular

期刊名称：PROCESSES （ 影响因子：3.5； 五年影响因子：3.4 ）

ISSN：

年卷期： 2023 年 11 卷 12 期

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收录情况： SCI

摘要： The use of bacterial and microalgal consortia to remove nitrogen from wastewater has garnered attention as a potential alternative to conventional systems. This approach not only reduces energy consumption but also aids in nutrient recovery. Light is essential for algae photosynthesis; however, nitrifying bacteria are also influenced by light radiation. This mini-review summarizes the current knowledge concerning photoinhibition, the light stimulation of ammonia-oxidizing bacteria (AOB), resistance to light radiation, the implementation of microalgal-bacterial systems, and the possible mechanisms involved. Nitrosomonadaceae AOB and Nitrospiraceae nitrite-oxidizing bacteria (NOB) often coexist in a microalgal-bacterial system. Studies have suggested that AOB can tolerate light radiation at 200 mu mol m-2 center dot s-1 in microalgal-bacterial systems, whereas NOB are almost completely suppressed, which can result in partial nitrification in the bioreactor. An appropriate light level can stimulate AOB growth in microalgal-bacterial granular reactors and may improve algae metabolic activity. Granular sludges or artificial "light-shielding hydrogel" could effectively protect nitrifying bacteria from light intensities up to 1600 mu mol m-2 center dot s-1 in wastewater treatment reactors. Microalgal-bacterial systems along with the associated "algal shading effect" have been widely used in pond aquaculture. This approach minimizes the need for costly mechanical aeration through photo-oxygenation and facilitates nutrient recovery by filter-feeding fish.

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