Bidirectional Enhancement of Nitrogen Removal by Indigenous Synergetic Microalgal–Bacterial Consortia in Harsh Low-C/N Wastewater

废水 氮气 细菌 环境科学 氮同化 环境工程 硝酸盐 污水处理 细菌细胞结构 制浆造纸工业 好氧反硝化 环境化学 反硝化细菌 化学 食品科学 反硝化 生物化学 工程类 生物 生态学 有机化学 遗传学
作者
Yanni Geng,Zhensheng Xiong,Liming Yang,Chun‐Ang Lian,Spyros G. Pavlostathis,Zhiguang Qiu,Houxing Chen,Qingchun Luo,Yuanqi Liu,Zhuochao Liu,Penghui Shao,Jian‐Ping Zou,Hualin Jiang,Shenglian Luo,Ke Qiang Yu,Xubiao Luo
出处
期刊:Environmental Science & Technology [American Chemical Society]
卷期号:58 (12): 5394-5404 被引量:6
标识
DOI:10.1021/acs.est.3c10322
摘要

Conventional microalgal–bacterial consortia have limited capacity to treat low-C/N wastewater due to carbon limitation and single nitrogen (N) removal mode. In this work, indigenous synergetic microalgal–bacterial consortia with high N removal performance and bidirectional interaction were successful in treating rare earth tailing wastewaters with low-C/N. Ammonia removal reached 0.89 mg N L–1 h–1, 1.84-fold more efficient than a common microalgal–bacterial system. Metagenomics-based metabolic reconstruction revealed bidirectional microalgal–bacterial interactions. The presence of microalgae increased the abundance of bacterial N-related genes by 1.5- to 57-fold. Similarly, the presence of bacteria increased the abundance of microalgal N assimilation by 2.5- to 15.8-fold. Furthermore, nine bacterial species were isolated, and the bidirectional promotion of N removal by the microalgal–bacterial system was verified. The mechanism of microalgal N assimilation enhanced by indole-3-acetic acid was revealed. In addition, the bidirectional mode of the system ensured the scavenging of toxic byproducts from nitrate metabolism to maintain the stability of the system. Collectively, the bidirectional enhancement system of synergetic microalgae-bacteria was established as an effective N removal strategy to broaden the stable application of this system for the effective treatment of low C/N ratio wastewater.
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