低温与常温条件下IMBR运行效果对比研究

Comparison of IMBR Treatment Effects under Low Temperature and Normal Temperature

采用动态实验的方法对比了低温条件(8～10℃)与常温条件(25℃)下一体式膜生物反应器(IMBR)对COD、NH+4-N的去除效果及机理,并考察了两种温度条件下的膜污染状况。实验结果表明,低温条件下IMBR对COD去除率仍可达到93%～96%,且经过18 d的运行后,对NH+4-N去除效率仍可接近100%,但低温条件下微生物对代谢产物(SMP)的降解效率降低。低温条件下的膜污染类型接近于滤饼层污染,常温(25℃)条件下则同时存在着相当程度的膜孔堵塞污染与滤饼层污染。低温条件会加快膜污染速度,因此,对低温条件下运行的IMBR来说,关键是加强膜污染控制。

In order investigate the characteristic of IMBR, a dynamic experiment was adopted to compare the removal efficiency of COD and NH^＋4-N as well as with the membrane fouling processe in low temperature （8-10℃）and normal temperature （25℃）. The result showed that the removal efficiency of COD could reach 93%-96% in low temerature and that of NH^＋4-N also could approach to 100% by given enough time ,but the SMP digesting efficiency of microorganism in the IMBR declined. The membrane were fouled mainly by accumulation stratum in low temperature, while both the accumulation stratum and jamming membrane orifices exist in normal temperature.It can be concluded that satisfying removal efficiency of COD can be obtained even in low temperature and the problem was that low temperature would accelerate the membrane fouling processe,so it was very important to control the membrane fouliny when IMBR was running in low temperature.