BPAC-UF组合工艺去除微污染原水中嗅味物质的工艺条件优化

Process Conditions Optimization of Taste and Odor Compounds Removal in Micro-Polluted Raw Water Treatment by Integrated Process of BPAC-UF

采用正交试验设计方法对BPAC-UF去除微污染水源水中嗅味物质的工艺条件进行优化。根据组合工艺要求和单因素预试验的结果,确定炭池曝气强度、污泥回流间隔、炭池PAC更新率和膜池曝气方式这4个试验因素,每个因素设置3个水平,共设计9组工况进行试验,并将嗅昧物质(二甲基三硫醚、2-甲基异茨醇、β-紫罗兰酮)及氨氮的去除率,跨膜压差的增长速率作为评价工艺运行效果和膜污染程度的指标。试验所得的最优工艺条件:炭池曝气强度为30 L/h,污泥回流间隔为0.5 h,PAC更新率为15%,膜池曝气方式为连续曝气。

Process conditions of taste and odor compounds removal in micro-polluted raw water treatment by integrated process of BPAC-UF were optimized by orthogonal experimental design. Based on the requirements of BPAC-UF and results of the single factor pre-test, aeration intensity of carbon tank, sludge return interval, PAC renewal rate and aeration mode of membrane bioreactor were selected as four factors, and every factor had three variable levels. Nine schemes of process conditions were designed by orthogonal design method. Index including removal rates of taste and odor compounds （DMTS, 2-MIB, p-ionone） and ammonia nitrogen, growth rate of transmembrane pressure were used to indicate process performance and membrane fouling. The optimal process condition was as followings aeration intensity of carbon tank was 30 L/h, sludge return interval was 0. 5 h, PAC renewal rate was 15% and membrane bioreactor was continuous aeration.