025-85283059
210003
025-85283059
210003
江南,某污水厂主流Anammox现象产生的原因探讨 苑泉1, 贺北平2, 钱亮2, 宫徽1, 万硕2, 蔡虎林3, 周亚旭3, 王凯军1清华大学环境学院环境模拟与污染控制国家重点联合实验室；浦华环保有
时间：2024-01-08
焦点提醒： 某污水厂支流Anammox现象发生的缘由切磋 苑泉1, 贺北平2, 钱亮2, 宫徽1, 万硕2, 蔡虎林3, 周亚旭3, 王凯军1清华年夜学情况学院情况摹拟与污染节制国度重点结合尝试室；浦华环保无限公司；西安市污水处置无限义务公司
municipal wastewater;mainstream Anammox;A2/O-IFAS process;carrier;font-size: 10pt;">simultaneous nitrification and denitrification
A full-scale wastewater treatment plant (WWTP) located in central China was upgraded based on the original inverted A2/O process, and the A2/O-IFAS process was formed by introducing carriers in the anaerobic and anoxic tanks. After more than four and a half years of stable operation, the system showed excellent nitrogen removal efficiency, andthe reddish biofilm appeared on the carriers in anaerobic and anoxic tanks. The biofilm on the carriers in the anaerobic and anoxic tanks hadAnammox activity. The microbial community composition of biofilm and suspended sludge was analyzed by highthroughput sequencing method.Candidatus Kuenenia,the dominant Anammox bacteria (AMX) at the genus level,was concentrated in the biofilm in the anoxic tank, and its relative abundance was significantly higher than that in the biofilm in the anaerobic tank and suspended sludge. Local aeration under the screens in the anaerobic and anoxic tanks was used to prevent blocking of the carriers and promote fluidization, which made the anaerobic/anoxic system always in alternate change of low dissolved oxygen (DO).It also promoted the simultaneous nitrification and denitrification (SND) process, and provided substrates for AMX. Coexistence, symbiosis and natural competition of traditional nitrifying bacteria and denitrifying bacteria in the suspended sludge and AMX in the biofilm removed nitrogen synergically at low DO. The low DO formed by local aeration and addition of carriers in the anaerobic and anoxic tanks promoted the emergence of mainstream Anammox phenomenon and became one of the main reasons for stable operation of the system.
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