A study was conducted on the distribution of pollutants in treated wastewater and the its safety for re-use purposes. Based on the results of a series of tertiary treatment experiments, the effects of three filtration processes, i.e. coagulation-filtration, ozonation-biological activated carbon filtration (O3-BAC) and ultrafiltration (UF), and two chemical disinfection processes, i.e. chlorination and ozonation, on the safety of water re-use were evaluated. It was found that the concentrations of the main pollutants in the secondary effluent and further filtered water follow a log-normal distribution and, therefore, a log-normal probabilistic function can be used to evaluate the suitability of the treated water for re-use purposes. Among the three filtration processes evaluated, UF is the most effective in turbidity removal but less effective in colour and COD removal, while coagulation-filtration and O3-BAC can ensure a good removal of all these pollutants. Regarding chemical disinfection, although chlorine is very effective in inactivation of coliform bacteria, it can not achieve a substantial decrease in viruses. As ozone is applied, effective virus removal can be achieved.
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Research Article| May 01 2006
Safety of treated water for re-use purposes – comparison of filtration and disinfection processes
Water Sci Technol (2006) 53 (9): 213–220.
X.C. Wang, F.G. Qiu, P.K. Jin; Safety of treated water for re-use purposes – comparison of filtration and disinfection processes. Water Sci Technol 1 May 2006; 53 (9): 213–220. doi: https://doi.org/10.2166/wst.2006.264
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