Zhao Zhen-Dong, Lin Qiang, Zhou Yang, Feng Yu-Hong, Huang Qi-Mei, Wang Xiang-Hui
Key Laboratory of Water Pollution Treatment and Resource Reuse of Hainan Province, Key Laboratory of Natural Polymer Functional Material of Haikou City, College of Chemistry and Chemical Engineering, Hainan Normal University, Haikou 571158, People's Republic of China.
Analytical and Testing Center, Hainan University, Haikou 570228, People's Republic of China.
R Soc Open Sci. 2021 Dec 1;8(12):201887. doi: 10.1098/rsos.201887. eCollection 2021 Dec.
The development of efficient and low-cost wastewater treatment processes remains an important challenge. A microaerobic up-flow oxidation ditch (UOD) with micro-electrolysis by waterfall aeration was designed for treating real municipal wastewater. The effects of influential factors such as up-flow rate, waterfall height, reflux ratio, number of stages and iron dosing on pollutant removal were fully investigated, and the optimum conditions were obtained. The elimination efficiencies of chemical oxygen demand (COD), ammonia nitrogen (NH -N), total nitrogen (TN) and total phosphorus (TP) reached up to 84.33 ± 2.48%, 99.91 ± 0.09%, 93.63 ± 0.60% and 89.27 ± 1.40%, respectively, while the effluent concentrations of COD, NH -N, TN and TP were 20.67 ± 2.85, 0.02 ± 0.02, 1.39 ± 0.09 and 0.27 ± 0.02 mg l, respectively. Phosphorous removal was achieved by iron-carbon micro-electrolysis to form an insoluble ferric phosphate precipitate. The microbial community structure indicated that carbon and nitrogen were removed via multiple mechanisms, possibly including nitrification, partial nitrification, denitrification and anammox in the UOD.
开发高效且低成本的废水处理工艺仍然是一项重大挑战。设计了一种通过瀑布曝气进行微电解的微氧上流式氧化沟（UOD）来处理实际城市污水。全面研究了上水流速、瀑布高度、回流比、级数和铁投加量等影响因素对污染物去除的影响，并获得了最佳条件。化学需氧量（COD）、氨氮（NH -N）、总氮（TN）和总磷（TP）的去除效率分别达到84.33±2.48%、99.91±0.09%、93.63±0.60%和89.27±1.40%，而COD、NH -N、TN和TP的出水浓度分别为20.67±2.85、0.02±0.02、1.39±0.09和0.27±0.02mg/l。通过铁碳微电解形成不溶性磷酸铁沉淀实现了磷的去除。微生物群落结构表明，碳和氮通过多种机制去除，可能包括UOD中的硝化、部分硝化、反硝化和厌氧氨氧化。
