A/O-MBBR组合工艺和A/O工艺处理市政污水的影响因素研究

Study on influencing factors on the performance of A/O-MBBR and A/O processes in municipal wastewater treatment

采用A/O-MBBR组合工艺和A/O工艺处理低C/N的市政污水,通过长达200d中试考察了水力停留时间(HRT)、回流比和低温对两种工艺除碳和脱氮性能的影响,同时比较了两种工艺抗冲击负荷的差异。结果显示:在填充比为35%,DO为2~5mg/L,HRT为3.6h,温度为16~18℃和回流比为100%条件下,A/O-MBBR组合工艺和A/O工艺的除碳和脱氮性能处于最佳水平,前者对COD、NH3-N和TN的平均去除率分别为85.5%、99.3%和37.5%;后者分别为80.8%、98.8%和35.7%。与A/O工艺相比,相同运行工况条件下A/O-MBBR组合工艺能够提高50%的日处理能力,具有较强的抗冲击负荷能力。

A/O- MBBR process and A/O process were applied for treating municipal wastewater with low C/N ratio. The effects of hydraulic retention time（HRT）, recirculation ratio and low temperature on organic matters and nitrogen removal of A/O-MBBR and A/O process were studied over 200 days＇ pilot scale experiments. The ability of these two processes in resisting shock load was also compared. The result indicated both the A/O-MBBR and A/O processes achieved the best treatment performance in organics and nitrogen removal, under a packing ratio of 35%,DO of 2~5 rag/L, HRT of 3.6 h,temperature of 16~18 ℃ and recirculation ratio of 100%. The average removal efficiencies of COD,NH3--N and TN were 85.5%,99.3% and 37. 5% for the A/O--MB- BR process, and were 80. 8%, 98. 8% and 35.7% for the A/O process. Compared with the A/O process, the A/O--MBBR process could increase the dailytreatment capacity by 50% under the same conditions. The A/O--MBBR process also showed stronger ability of resisting shock load.