Optimization of ozone disinfection and its effect on trihalomethanes

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• 作者：K. Verma^a ; ^{kavitavrm4@gmail.com" class="auth_mail" title="E-mail the corresponding author} ; D. Gupta^b ; A.B. Gupta^b
• 关键词：AC ; alternate current ; ANOVA ; Analysis of Variance ; APHA ; American Public Health Association ; BOD ; Biological Oxygen Demand ; CFU ; Colony Forming Unit ; COD ; chemical oxygen demand ; DBP ; disinfection by product ; DNA ; deoxyribose nucleic acid ; HAA ; halo acetic acid ; MNIT ; Malaviya National Institute of Technology ; MPN ; most probable number ; NTP ; normal temperature and pressure ; ppm ; parts per million ; RBC ; Rotating Biological Contractor ; RSM ; Response Surface Methodology ; SEM ; scanned electron micr
• 刊名：Journal of Environmental Chemical Engineering
• 出版年：2016
• 出版时间：September 2016
• 年：2016
• 卷：4
• 期：3
• 页码：3021-3032
• 全文大小：1778 K

文摘

Ozone is an attractive disinfection alternative to chlorine as chlorine has some environmental consequences due to its disinfection byproducts potential. In the present study ozone was used for the disinfection of secondary treated effluent of sewage treatment plant which is based on rotating biological contactor, process, Malaviya National Institute of Technology (Jaipur). From the experimental results it was found that ozone dose of 30 mg/L was required to achieve WHO standards for Total Coliform Count (TCC) of 1000 CFU/100 mL for food crop irrigation and recreational impoundments. One factorial design method of response surface methodology (RSM) was used for statistically obtaining optimum ozone dose that satisfies the norms for COD and TCC simultaneously. The optimized ozone dose suggested by the model was 30 mg/L to bring TCC within norms and the value of COD at this dose was 21 mg/L. Experimental verification of the results was in good agreement with the predicted results of one factorial design. Analysis of scanned electron microscopy (SEM) images, shows the effect of ozone doses on bacterial cell membrane. Effect of ozone on four trihalomethanes was also studied using GC–MS/MS.