跌水曝气生物接触氧化预处理微污染水源水

EXPERIMENTAL STUDY ON PRE-TREATMENT OF MICRO-POLLUTED SOURCE WATER WITH WATER-DROPPING AERATION BIOLOGICAL CONTACT OXIDATION

采用三阶跌水曝气生物接触氧化预处理微污染水源水,试验结果表明,平均水温19.5℃,平均溶解氧7.90mg·L-1,生物接触氧化的水力停留时间(HRT)为1.6h时,反应器对浊度、氨氮、CODMn、亚硝酸氮和藻类的去除率分别为36.2%、65.4%、17.0%、67.0%和65.2%,并通过三级跌水曝气共充氧1.41mg·L-1,使出水溶解氧浓度大于4.69mg·L-1。采用跌水曝气阶式反应器可以有效克服传统鼓风曝气推流反应器均匀供氧的不足,其中影响跌水曝气的因素中水温起主要作用,其次是原水实际溶解氧浓度,最后为跌水高度。

The experiments of pre-treatment of micro-polluted source water with three water-dropping aeration biological contact oxidation were performed. The results showed that the removal rates of turbidity, NH3-N, CODMn, NO2^--N and algae by this process were 36.2% ,65.4%, 17.0% ,67.0% and 65.2% respectively when the average water temperature was 19.5℃ ,the average DO was 7.45 mg·L^-1 and the HRT was 1.6 hours; The total DO aerated by the three water-dropping is 1.41 mg·L^-1 and the DO of effluent is larger than 4.69 mg·L^-1. The reactor with water-dropping aeration can effectively overcome the defect of traditional reactor with air-blast aeration in homogeneous supply of oxygen. The main factors which effected the water-dropping aeration were water temperature, the real DO of the raw water and the height of water-dropping.