Single denitrification using bacteria has been widely investigated, but few studies have focused on the simultaneous removal of nitrate, phosphorus. and tetracycline. Strain L2, an iron-reducing bacteria, was immobilized using chitosan/polyvinyl alcohol to simultaneously remove nitrate and phosphorus. The effects of carbon/nitrogen ratio (1:1, 1.5:1, and 2:1), initial Fe2+ concentration (0, 15, and 30 mg·L-1), and HRT (2, 4, and 6 h) were assessed in bioreactors and optimum conditions were established. Results showed that the nitrate and phosphorus removal efficiency reached 100.00% (2.697 mg·L-1·h-1) and 81.93% (1.533 mg·L-1·h-1) under the conditions of carbon/nitrogen of 2:1, Fe2+ concentration of 30 mg·L-1 and HRT of 6 h. The precipitation of bioreactor, which identified as FeOOH by XRD, had significant adsorption on tetracycline. The results of high-throughput sequencing indicated that strain L2 played a significant role in denitrification. This bioreactor provided effective method for the treatment of polluted water contaminated by nitrate, phosphorus, and tetracycline.

中文翻译：

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通过在固定化壳聚糖/聚乙烯醇的生物反应器中进行沉淀，可以高效去除硝酸盐和磷以及吸附四环素。

使用细菌进行的一次反硝化已经被广泛研究，但是很少有研究集中在同时去除硝酸盐，磷上。和四环素。使用壳聚糖/聚乙烯醇固定菌株L2（一种还原铁细菌）以同时去除硝酸盐和磷。碳氮比（1：1、1.5：1和2：1），Fe2 +初始浓度（0、15和30 mg·L-1）和HRT（2、4和6 h）的影响在生物反应器中进行评估并确定最佳条件。结果表明，在碳氮比为2：1的条件下，硝酸盐和磷的去除效率分别为100.00％（2.697 mg·L-1·h-1）和81.93％（1.533 mg·L-1·h-1）。 ，Fe2 +浓度为30 mg·L-1，HRT为6 h。XRD鉴定为FeOOH的生物反应器沉淀物在四环素上具有显着吸附。高通量测序的结果表明，菌株L2在反硝化中发挥了重要作用。该生物反应器为处理被硝酸盐，磷和四环素污染的污水提供了有效的方法。