Comparison of inactivation efficacy in low temperature water with several pre-oxidation processes

The total count of bacteria is regarded as monitoring index in this paper. The inactivation effect with the change of water temperature are reviewed in laboratory with individual application pre-oxidation process of potassium permanganate, chlorine and chloramines, and with combined application pre-oxidation process of potassium permanganate with chlorine or chloramines. The inactivation efficacies of several pre-oxidation processes are compared with low temperature water, and the pre-oxidation processes with better inactivation efficacy is approached. The results showed that the inactivation efficacies of several pre-oxidation processes are influenced between different degree by water temperature within certain time. The conclusion is as follows by compared the Q_(10) value of several processes: the temperature influence to inactivation effect with the combined process is clearly less than that with the individual process. The inactivation effects of the combined process with low temperature and seriously polluted surface water are obviously better than the individual process. This paper provides a safe pretreatment technique of polluted water in the winter of north China.