Mixed pollution of nitrate, tetracycline (TC) and cadmium (Cd) induced by improper discharge of various wastewater from industry and agriculture has attracted extensive attention. A novel biocarrier (MBF@FMJSB) assembled with modified basalt fiber and modified wild jujube seed biochar (FMJSB) was used to construct fixed-biofilm reactor (FBR) for concurrent removal of nitrate, TC, and Cd. The removal efficiencies of nitrate, TC, and Cd of the bioreactor were 79.34%, 85.45%, and 88.02%, respectively, when HRT was 6.0 h, C/N ratio was 1.5, influent nitrate concentration was 25 mg L, pH was 6.5, and TC and Cd concentrations was 0.6 and 1 mg L. The addition of FMJSB was not only beneficial for bacteria to resist the stress of TC and Cd, but also contributed to the removal of TC and Cd pollutants. In addition, microbial metabolism was a key pathway for pollutant removal in FBR. Microflora with as a core genus can dynamically regulate the community structure and expression of microbial metabolism related genes to adapt to TC and Cd stresses. This study was valuable for the treatment of wastewater containing mixed pollutants.

中文翻译：

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用改性玄武岩纤维和改性酸枣籽生物炭组装固定生物膜反应器，同时去除硝酸盐、四环素和镉：性能和微生物响应


工农业各类废水排放不当引起的硝酸盐、四环素（TC）和镉（Cd）混合污染引起广泛关注。采用改性玄武岩纤维和改性酸枣籽生物炭（FMJSB）组装而成的新型生物载体（MBF@FMJSB）构建固定生物膜反应器（FBR），同时去除硝酸盐、TC和Cd。当HRT为6.0 h、C/N比为1.5、进水硝酸盐浓度为25 mg L、pH为6.5时，生物反应器对硝酸盐、TC和Cd的去除率分别为79.34%、85.45%和88.02%。 ，TC和Cd浓度分别为0.6和1 mg·L。FMJSB的添加不仅有利于细菌抵抗TC和Cd的胁迫，而且有助于TC和Cd污染物的去除。此外，微生物代谢是FBR去除污染物的关键途径。以属为核心的微生物区系可以动态调控微生物代谢相关基因的群落结构和表达，以适应TC和Cd胁迫。该研究对于含有混合污染物的废水的处理具有重要意义。