School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China; State Key Laboratory of Green Building in West China, Xi'an University of Architecture and Technology, Xi'an 710055, China.
School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China; State Key Laboratory of Green Building in West China, Xi'an University of Architecture and Technology, Xi'an 710055, China.
Bioresour Technol. 2019 Aug;286:121407. doi: 10.1016/j.biortech.2019.121407. Epub 2019 May 2.
An immobilized biofilm reactor (IBR) was established to treat nitrate using different electron donors. A novel material, FeO@Cu/PVA, was synthesized as an adsorbent and bacterial immobilized carrier in the reactor. The optimum condition of nitrate removal were pH 7.0, hydraulic retention time (HRT) of 10 h under autotrophic and mixotrophic conditions. Strain H-117 in the mixotrophic reactor had better adaptability to changes in the initial pH. The metabolism in the mixotrophic reactor was more vigorous than that in autotrophic reactor. The microbial communities and structures were evaluated to determine the nitrate removal mechanisms in this system. Microbial analyses demonstrated that different electron donor could influence the bacterial abundance and species in the IBR system. Proteobacteria was the most dominant phylum in all IBRs and accounted for more than 50% of the total phyla. Pseudomonas and Rhizobium were the dominant contributor to the effective removal of nitrate in the IBRs.
采用不同电子供体，建立固定化生物膜反应器（IBR）处理硝酸盐。作为吸附剂和细菌固定化载体，在反应器中合成了一种新型材料 FeO@Cu/PVA。在自养和混合营养条件下，硝酸盐去除的最佳条件为 pH 值 7.0、水力停留时间（HRT）为 10 h。混合营养反应器中的菌株 H-117 对初始 pH 值的变化具有更好的适应性。混合营养反应器中的代谢比自养反应器更为旺盛。评估微生物群落和结构，以确定该系统中硝酸盐去除的机制。微生物分析表明，不同的电子供体可能会影响 IBR 系统中细菌的丰度和种类。变形菌门是所有 IBR 中最主要的门，占总门的 50%以上。假单胞菌属和根瘤菌属是 IBR 中有效去除硝酸盐的主要贡献者。
