National-Local Joint Engineering Research Center of Heavy Metals Pollutants Control and Resource Utilization, Nanchang Hangkong University, Nanchang, 330063, PR China.
National Engineering Laboratory for Advanced Municipal Wastewater Treatment and Reuse Technology, Beijing University of Technology, Beijing, 100124, PR China.
Environ Res. 2022 Nov;214(Pt 3):114076. doi: 10.1016/j.envres.2022.114076. Epub 2022 Aug 13.
Low C/N municipal wastewater is difficult to be treated effectively via traditional biological methods, leading to concentrations of pollutants in effluent far exceeding increasingly strict standards. In this work, we propose a novel microalgae-bacteria tandem-type process to simultaneously remove ammonia nitrogen (NH-N) and phosphorus (P) from municipal wastewater. A 4.5 L microalgae-bacteria tandem-type reactor was constructed and operated stably for 40 days. The removal efficiencies of NH-N and P reached 97.5% and 92.9%, respectively, effluent concentrations were 0.53 and 0.17 mg/L on average, which met the Environmental quality standards for surface water in China (GB 3838-2002). Remarkably, microalgae ponds accounted for 69.3% and 76.3% of the overall NH-N and P removal via microalgae assimilation. Furthermore, 16 S rRNA gene amplicon sequencing revealed the abundance of bacteria changed, suggesting that the presence of microalgae leads to some species extinction and low-abundance bacteria increase. This work demonstrated that the microalgae-bacteria tandem-type processes can be efficient and widely applied in the advanced treatment of municipal wastewater.
低 C/N 城市污水通过传统的生物方法难以有效处理，导致污水中的污染物浓度远远超过日益严格的标准。在这项工作中，我们提出了一种新型的微藻-细菌串联工艺，用于同时去除城市废水中的氨氮 (NH-N) 和磷 (P)。构建并稳定运行了一个 4.5 L 的微藻-细菌串联式反应器 40 天。NH-N 和 P 的去除效率分别达到 97.5%和 92.9%，平均出水浓度分别为 0.53 和 0.17 mg/L，达到了《地表水环境质量标准》(GB 3838-2002)。值得注意的是，微藻同化对总 NH-N 和 P 去除的贡献率分别为 69.3%和 76.3%。此外，16S rRNA 基因扩增子测序结果表明，细菌丰度发生了变化，表明微藻的存在导致了一些物种的灭绝和低丰度细菌的增加。这项工作表明，微藻-细菌串联工艺可以有效地应用于城市污水的深度处理。
