Suzuki Y, Kondo T, Nakagawa K, Tsuneda S, Hirata A, Shimizu Y, Inamori Y
Department of Chemical Engineering, Waseda University, 3-4-1 Ohkubo, Shinjuku-ku, Tokyo 169-8555, Japan.
Water Sci Technol. 2006;53(6):107-13. doi: 10.2166/wst.2006.179.
A new biological nutrient removal process, anaerobic-oxic-anoxic (A/O/A) system using denitrifying polyphosphate-accumulating organisms (DNPAOs), was proposed. To attain excess sludge reduction and phosphorus recovery, the A/O/A system equipped with ozonation tank and phosphorus adsorption column was operated for 92 days, and water quality of the effluent, sludge reduction efficiency, and phosphorus recovery efficiency were evaluated. As a result, TOC, T-N and T-P removal efficiency were 85%, 70% and 85%, respectively, throughout the operating period. These slightly lower removal efficiencies than conventional anaerobic-anoxic-oxic (A/A/O) processes were due to the unexpected microbial population in this system where DNPAOs were not the dominant group but normal polyphosphate-accumulating organisms (PAOs) that could not utilize nitrate and nitrite as electron acceptor became dominant. However, it was successfully demonstrated that 34-127% of sludge reduction and around 80% of phosphorus recovery were attained. In conclusion, the A/O/A system equipped with ozonation and phosphorus adsorption systems is useful as a new advanced wastewater treatment plant (WWTP) to resolve the problems of increasing excess sludge and depleted phosphorus.
提出了一种新的生物营养物去除工艺，即使用反硝化聚磷菌（DNPAOs）的厌氧-好氧-缺氧（A/O/A）系统。为了实现剩余污泥减量和磷回收，运行配备了臭氧氧化池和磷吸附柱的A/O/A系统92天，并对出水水质、污泥减量效率和磷回收效率进行了评估。结果，在整个运行期间，TOC、总氮和总磷的去除效率分别为85%、70%和85%。这些去除效率略低于传统的厌氧-缺氧-好氧（A/A/O）工艺，原因是该系统中出现了意外的微生物群落，其中DNPAOs不是优势菌群，而不能利用硝酸盐和亚硝酸盐作为电子受体的普通聚磷菌（PAOs）成为了优势菌群。然而，已成功证明该系统实现了34%-127%的污泥减量和约80%的磷回收。总之，配备臭氧氧化和磷吸附系统的A/O/A系统作为一种新型先进污水处理厂，对于解决剩余污泥增加和磷资源短缺问题是有用的。
