动态膜-生物反应器对城市污水的处理

应用动态膜原理,以0.1mm孔径的普通筛网代替固定膜材料构成一体式动态膜-生物反应器(DMBR)处理实际城市污水.HRT＝3.5h时,出水水质良好.DMBR在小于数cm的液位差下自流出水,出水中的SS最高检测值为4.05mg/L,但在多数情况下为0.在MLSS约7000～8000mg/L下,当动态膜通量为14.9L/(m²·h)时,出水水头仅为5.8mm;27d连续运行,出水水头没有明显改变.动态膜对反应器上清液中的COD和TOC的平均去除率分别为28.74%和36.9%.当溶解氧浓度大于2～3mg/L时,氨氮去除率大于96%.

A Submerged Dynamic Membrane Bioreactor for Domestic Wastewater Treatment

The dynamic membrane forming on the surface of 0.1 mm Dacron mesh was utilized instead of static membrane, e.g. hollow fiber membrane, to develop a submerged dynamic membrane bioreactor (DMBR). The DMBR had high quality effluents when treating domestic wastewater at HRT = 3.5 h. The dynamic membrane could work steadily at a pressure no more than several centimeters water head drop. The highest SS concentration in the effluents was 4.05 mg/L, whereas the measured SS concentrations were zero in most circumstances. At condition of MLSS = 7000-8000 mg/L, the effluent head drop was only 5.8 mm when flux = 14.9 L/(m2.h), and it had little change during a continuous run for 27 days. The dynamic membrane averagely removed 28.74% of COD and 36.9% of TOC in the supernatant of the mixed liquor. The DMBR could remove NH3-N more than 96% when DO in the mixed liquor was no less than 2-3 mg/L.