Department of Water and Wastewater Engineering, School of Urban Construction, Wuhan University of Science and Technology, Wuhan 430065, China.
Key Laboratory of Water and Sediment Sciences of Ministry of Education, State Key Laboratory of Water Environment Simulation, School of Environment, Beijing Normal University, Beijing 100875, China.
Sci Total Environ. 2022 Nov 20;848:157657. doi: 10.1016/j.scitotenv.2022.157657. Epub 2022 Jul 27.
Microalgal-bacterial granular sludge (MBGS) process has a gorgeous prospect for municipal wastewater treatment, but the research on the treatment of complex organic wastewater by MBGS process with CO addition under outdoor conditions is not enough. Therefore, this paper evaluated the feasibility of CO-added MBGS process for complex organic wastewater disposal under natural day-night cycles. The results showed that the addition of CO overall improved the removal efficiency of pollutants. Typically, the removal efficiency of total phosphorus increased averagely from 88.5 % to 95.0 % in 12-h day cycle and from 26.2 % to 45.3 % in 12-h night cycle. The addition of CO increased the size of MBGS from 1.0 mm to 16.5 mm within 30 days due to extracellular polymeric substances secretion and the dominant filamentous microalgae on granules. The decrease of catalase activity and malondialdehyde content indicated that CO reduced oxidative damage and maintained the normal growth of MBGS. Further estimates of the collected gas showed that CO-added MBGS process could reduce global CO emissions by one hundred million tons per year. This study is expected to contribute to the goal of carbon neutrality in the area of wastewater treatment by MBGS process.
微藻-细菌颗粒污泥（MBGS）工艺在城市污水处理方面具有广阔的前景，但在户外条件下添加 CO 用 MBGS 工艺处理复杂有机废水的研究还不够充分。因此，本文评估了在自然昼夜循环条件下添加 CO 的 MBGS 工艺处理复杂有机废水的可行性。结果表明，添加 CO 总体上提高了污染物的去除效率。通常，在 12 小时白天周期内，总磷的去除效率从 88.5%提高到 95.0%，在 12 小时夜间周期内，从 26.2%提高到 45.3%。在 30 天内，由于胞外聚合物的分泌和颗粒上占主导地位的丝状微藻，添加 CO 增加了 MBGS 的粒径从 1.0 毫米到 16.5 毫米。过氧化氢酶活性和丙二醛含量的降低表明 CO 减少了氧化损伤，维持了 MBGS 的正常生长。对收集到的气体的进一步估算表明，添加 CO 的 MBGS 工艺每年可减少 1 亿吨的全球 CO 排放。本研究有望为通过 MBGS 工艺实现污水处理碳中和目标做出贡献。
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