Comparison of Degradation Efficiency of Multiple Emerging Pollutants in Source Water by Different Pre-oxidation Processes

Abstract:

Taking raw water from a water source in Shanghai as the research object， the effects of different pre-oxidation processes on the removal of characteristic pollutants were studied for the characteristic pollutants such as antibiotics and pesticides present in the source water. This study found that the ability of the removal of antibiotics under the same dose （0.2 ~ 0.8 mg·L^-1） of oxidant is ozone > potassium permanganate > free chlorine； the more dosage of each oxidant， the higher the removal rate of antibiotics. The ability of potassium permanganate to remove antibiotics first rises and then falls with pH increasing， while free chlorine and ozone gradually increases. The ability of removal of organic chlorine pesticides under the same dose oxidant is ozone > potassium permanganate > free chlorine. With the increase of pH， the removal ability of potassium permanganate to organic chlorine pesticides decreases， and the ability to remove ozone increases. The removal ability of free chlorine unchanged.

Key words:water treatment;source water;pre-oxidation;antibiotics;organic chlorine pesticides