Study Of Preoxidation Technical Methods In Different Water Quality Periods Of Luanhe River

Nowadays,with the water body polluted seriously and the standard of drinking water qulity improved, the conventional treatment processes can't meet the request of the new standard.The problem of table-water's pollution have prevented the stabilization of society.Therefore,it is necessary to find improved,economic,highly efficacious treatment processes.The pilot experiment was done as the quality of Tianjin resource water varing greatly with seasons and often worsening abruptly.Chemical preoxidation and subsequent flotation processes was applied.Compare the removal effect of different chemical preoxidation with each other in order to improve the removal efficacy of turbidity and organic matters.According to analyzing preoxidation by different chemicals,choose the best technic method in the case of meeting the request of the standard and put the technic in practice.The content includes preoxidation by different chemicals in the period of low temperature and low turbidity, the efficacy of removaling pollution in ordinary period and preoxidation by different chemicals in the period of high amounts of algae.The preoxidation by four chemicals,such as PPC, ozone,PPC combined with ozone and PPC combined with chlorine,and its influence on the subsequent processes are analyzed in the study.(1)In the period of low temperature and low turbidity, the removal efficacy of turbidity was similar through the preoxidation by different chemicals,but the removal efficacy of organic matters wasn't. Preoxidation's effect by ozone is the best,PPC combined with chlorine take second place.Considering the economic factor and preoxidation by PPC combined with chlorine easy to implement,choose the PPC(1.0mg./L) combined with chlorine(2mg/l) as chemical preoxidant with subsequent coagulation flotation and filtration processes is the best in this period. (2)As to the water in ordinary period,the water quality is the best in years. The conventional treatment processes have met the request of the standard. Therefore,only preoxidation by ozone are researched to study preoxidation's effect.The experiment show preoxidation still have effect on the removal efficacy of turbidity and organic matter.(3) As to water in Summer with high amounts of algae, the removal efficacy of turbidity was similar through the preoxidation by different chemicals.However, preoxidation by PPC is the best to the removal efficacy of algae and organic matters and it is cheaper .Thus,choose preoxidation by PPC(1.0mg/l) as chemical preoxidant with subsequent coagulation flotation and filtration processes is the best in this period.All in all, though the experiment,we have confire the best technic method in different periods ,which will be guidance to enhanced conventional treatment processes in water works.The production can be spreaded to other water supply enterprise,and have theoretical investigation value and practical application.