低强度超声波强化ABR 处理低浓度污水

为提高ABR (厌氧折流板反应器)对低浓度污水的处理效果,通过设置超声组和对照组ABR 的对比试验,考察低强度超声波对ABR 处理低浓度污水的强化效果.结果表明,当采用声能密度为 0.1 W/mL 的超声波,每隔24 h 从ABR 中各隔室内取出10 %的污泥进行10 min 的辐照处理时,平均 COD 总去除率提高7.2 %左右. 通过该辐照处理,ABR 中各隔室内的胞外聚合物总量基本不变尧蛋 白质的含量有所提高尧多糖的含量有所降低尧DNA 的含量变化不大尧颗粒污泥的粒径减小. 研究还发 现,低温条件下,超声组ABR 的平均COD 去除率比对照组提高了8.6 豫,只低于常温条件下对照组 0.7 豫.低温条件下的超声强化效果比常温条件下更显著,而且超声组ABR 比对照组提前4 d 恢复稳 定运行. 

Treatment of low concentration sewage by low intensity ultrasonic strengthen ABR

To improve the treatment effect of ABR (anaerobic baffled reactor) for low concentration wastewater, the effect of low intensity ultrasound on the treatment of low concentration wastewater was studied by perform-ing a contrast test of ABR in ultrasonic group and control group. The results show that when using the energy density of 0.1 W/mL ultrasonic every 24 h from each compartment of ABR removed 10 % sludge for 10 min of irradiation processing, the average removal rate of COD increased by about 7.2 %. By this irradiation, the total amount of extracellular polymeric in each compartment of ABR is essentially the same, the content of protein is increased, the content of polysaccharides is reduced, the content of DNA changes little, and the particle size of granular sludge is decreased. It is also found that the average COD removal rate of ABR in the ultrasonic group is 8.6 percentage points lower than that in the control group at low temperature, which is only 0.7 per-centage points lower than that in the control group. Under low temperature condition, the strengthening effect of ultrasound is more significant than that of normal temperature,and the ABR of the ultrasound group is 4 days earlier than the control group to resume stable operation.