微氧升流柱-好氧与传统缺氧-好氧处理生活污水性能比较

Performance Comparison between upflow Microaerobic-Oxic Process( M/O) and Traditional Anoxic-Oxic System( A/O) for Domestic Wastewater Treatment

采用MO(微氧升流柱-好氧)工艺,通过控制M柱(微氧升流柱)ρ(DO)使其处于缺氧环境,从而代替传统AO工艺的缺氧段.在相同运行条件下对2种工艺处理生活污水的性能进行对比研究.结果表明:在HRT(水力停留时间)为12 h、内循环污泥回流比为200%、外循环污泥回流比为50%的条件下,MO和AO工艺对ρ(COD Cr)的平均去除率分别为88.0%和83.0%,MO工艺比AO工艺高6%,出水ρ(COD Cr)均小于50 mgL;对NH4+-N的平均去除率分别为95.0%和93.3%,去除效果相差不大;而对TN的去除存在明显的差异,MO工艺对TN的去除率平均值达67.5%,比AO工艺高近16%.在将近160 d的运行过程中,MO工艺抗冲击负荷能力明显优于AO工艺,出水水质波动较小、运行稳定,并且脱氮效果得到强化.

An upflow microaerobic-oxic （M/O） process was proposed. During this process an upflow column was controlled under low dissolved oxygen by aeration to replace the rectangular anoxic reactor controlled by mixer. A comparative study on wastewater treatment performance was conducted using the two systems under the same operation condition. The results showed that under the condition that hydraulic retention time （HRT） lasted 12 h and the sludge recycle ratio was 200% （inner） and 50% （outer）, the average CODer removal efficiency of M/O and A/O were 88.0% and 83.0% , respectively. CODc, removal efficiencies of M/O process achieved 6% higher than that of A/O and the effluent. The CODcr contents of both systems were below 50 mg/L. The difference of ammonia removal efficiencies between M/O and A/O was not obvious and achieved at 95.0% and 93.3% , respectively. However, there was a significant difference of total nitrogen （TN） removal effect and the average removal efficiency of M/O was 16% higher than that of A/O, and the TN removal efficiency for M/O was 67.5% . During nearly 160 day＇s operation, M/O process appeared more stable, lower fluctuation of effluent water quality, higher resistance to shock loading than A/O, especially strengthened the TN removal.