AAOA-MBR工艺污水脱氮特性及脱氮机制

为了提高污水脱氮效果,在传统A2O工艺的基础上,增加后置缺氧段并与膜生物反应器相结合,构建了AAOA-MBR污水处理中试装置,进行了中试实验。实验结果表明,在进水COD浓度为100.00~280.00 mg/L、TN浓度为18.32~31.86 mg/L、NH4+-N浓度为12.78~24.44 mg/L时,COD、TN和NH4+-N的平均去除率分别达到了90.0%、72.1%和99.0%,出水水质达到《城镇污水处理厂污染物排放标准》(GB 18918-2002)中的一级A标准;通过多点进水优化了内源配置,节约了碳源,强化了脱氮效果;采用膜池回流供氧,可在节能的同时保证缺氧池1的缺氧环境,提高了反硝化效果。本文的研究成果为实际污水处理工程市场提供了一套高效脱氮的新工艺。

Sewage nitrogen removal characteristics and mechanism by AAOA-MBR technology

In order to improve the effect of nitrogen removal from sewage, a rear anoxic pond was added after a traditional A2O process, and followed by MBR, which constructed a pilot sewage treatment device with AAOA-MBR technology. Pilot experiments was accomplished with the device. The experimental results showed that when the influent concentrations of COD, TN, NH4+-N were 100.00 to 280.00 mg/L, 18.32 to 31.86 mg/L, 12.78 to 24.44 mg/L, respectively, the average removal rates of COD, TN and NH4+-N were 90.0%, 72.1% and 99.0%, the effluent quality met the first level A criteria specified in Discharge Standard of Pollutants for Municipal Wastewater Treatment Plant (GB 18918-2002 ). Through step feeding, inner carbon configuration can be optimized, and carbon source can be partially saved, and the effect of nitrogen removal can be improved. By backflow from MBR, oxygen can be provided to oxidation pond, which can decrease aeration quantity for saving energy and ensure anoxic pond in hypoxia environment for increasing denitrification effect. The experiment results may provide a new technology for nitrogen removal in actual practice.