High-concentration COD wastewater treatment with simultaneous removal of nitrogen and phosphorus by a novel Candida tropicalis strain: Removal capability and mechanism.
High-concentration COD wastewater treatment with simultaneous removal of nitrogen and phosphorus by a novel Candida tropicalis strain: Removal capability and mechanism.
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DOI：
10.1016/j.envres.2022.113471
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发表时间：
2022-05
影响因子：
8.3
通讯作者：
Yuzhe He;Yaqi Zhang;Tianyu Li;Xingxing Peng;Xiao-shan Jia
中科院分区：
文献类型：
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作者：
Yuzhe He;Yaqi Zhang;Tianyu Li;Xingxing Peng;Xiao-shan Jia
建立好氧和厌氧连续搅拌槽反应器（CSTR），上流式厌氧污泥毯（UASB），并接种新分离的热带假丝酵母。在高浓度COD （8000 mg/L）条件下运行，改性后的UASB反应器对COD的同时去除氮和磷酸盐的效果优于其他两种反应器。值得注意的是，在有氧或无氧条件下，都产生了大量有机酸和酒精。转录组学分析表明，无氧条件下的碳代谢通过调节和抑制一些功能基因，与有氧条件下的碳代谢具有相同的途径。利用不同碳源的实验证明了该菌株利用有机物的优异性能，转录组学分析证实了这一点。最后，利用该菌株对四种含糖废水进行了处理。其中，菌株对啤酒废水的COD（90%）、氮（89%）和磷酸盐（82%）的去除率最高。
Aerobic and anaerobic continuous stirred-tank reactor (CSTR), up-flow anaerobic sludge blanket (UASB) were set up and inoculated with newly isolatedCandida tropicalis. Reactors were operated at high concentrations of chemical oxygen demand (COD) (8000 mg/L), the modified UASB expressed better COD removal rate simultaneously removal of nitrogen and phosphate than other two reactors. Notably, under both aerobic or anaerobic conditions, large amounts of organic acids and alcohol were generated. Transcriptomic analysis showed that carbon metabolism under anaerobic conditions shared the same pathway with aerobic conditions by regulating and inhibiting some functional genes. Experiments utilizing different carbon sources proved that our strain has excellent performances in utilizing organic materials, which were verified by transcriptomic analysis. Finally, the strain was applied to treat four types of sugar-containing wastewaters. Among them, our strain exerts the best removal capability of COD (90%), nitrogen (89%), and phosphate (82%) for brewery wastewater.