基于ACTIFLO~工艺的预氧化中试研究

Pilot Study of Pre-oxidation Based on ACTIFLO~ Process

北方某大型净水厂采用了ACTIFLO高效沉淀工艺，并已成功运行4年多。在该厂进行预臭氧处理改造过程中，基于现有ACTIFLO高效沉淀池中试装置，进行了一系列试验，以期为生产运行提供指导。研究发现，预臭氧氧化会导致沉淀池出水浊度升高，滤池运行周期缩短。此外，还分别研究了净水厂常用的另外两种预氧化剂——高锰酸钾和次氯酸钠对混凝及沉淀过程的影响，发现过量投加同样会对混凝过程产生负面影响，导致沉淀池出水浊度升高及滤池过滤周期缩短。对比发现，各氧化剂的影响程度不同，针对原水水质特性，通过优化氧化剂的投加量以控制其残余量，可以确保ACTIFLO工艺的运行效果良好。

A large drinking water plant in north China has applied ACTIFLO settler successfully for more than 4 years. During the pre-oxidation upgrading, a series of pilot tests based on the existing ACTIFLO settler were carried out to provide guidance for production operation. The study results show that the pre-ozonation can cause the increasing of turbidity at the outlet of settler, and the operation periods of the downstream filters are shortened. The influence of potassium permanganate （KMnO4） and sodium hypochlorite （NaClO） on coagulation sedimentation was also studied. It is found that the excessive dosage has a negative impact on coagulation sedimentation, with a higher turbidity at the outlet of settler and shorter operation periods of filters. The comparison of the results shows that each kind of oxidant has different impact on the treated water turbidity. Based on the raw water quality, the dosage of oxidant shall be optimized and the residue concentration shall be controlled at very low level. In this way, a better operation result of ACTIFLO settler can be achieved.