厌氧膜生物反应器处理酒厂废水运行特性研究

Upflow flat-sheet membrane coupled anaerobic bioreactor for treatment of brewery wastewater

在一体式平板厌氧膜生物反应器处理酒厂废水的试验中,研究了污染物的去除效果和平板膜组件的运行、污染情况。试验结果表明,COD容积负荷为3～7kg/(m3.d)、水力停留时间(HRT)为16h时,平均COD去除率达94.2%;在膜通量为4.6L/(m2.h)、上升流速为2.5m/h的条件下,平板膜组件能够连续运行18～20d;在该试验中临界通量和临界上升流速分别为10～15L/(m2.h)和5.0m/h,平板膜组件应该在这两个临界值之下运行。膜过滤阻力分析测试结果表明,泥饼层阻力是总阻力的最大组成部分。

A lab scale upflow flat-sheet membrane （100 ku） coupled anaerobic bioreactor （MCAB） was employed for treatment of a high-strength brewery wastewater （COD= 1 653-7 651 rag/L）. The membrane fouling and its effects on treatment performance were investigated. Operating at an uplow velocity of 2. 5 m/h （flux = 4. 6 L/（m^2·h））, the MCAB treatment performance was good and steady for 18 to 20 days, achieving an average COD removal of 94.2% at an COD loading of 3-7 kg/（ms·d） and a HRT of 16 h. To prevent a rapid increase in pressure drop across the membrane, the MCAB should be operated below the critical flux of 10-15 L/（m^2 · h） （upflow velocity 5.0 m/h）. Periodic membrane cleaning （with 0.5% NaC10 followed by 1% HC1） was practiced to control the cake layer resistance which was the largest component of the overall membrane resistance.