首页|Removal of kathon by UV-C activated hydrogen peroxide:Kinetics,mechanisms,and enhanced biodegradability assessment
Removal of kathon by UV-C activated hydrogen peroxide:Kinetics,mechanisms,and enhanced biodegradability assessment
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Kathon(CMI-MI),a mixture of 5-chloro-2-methyl-4-isothiazolin-3-one(CMI)and 2-methyl-4-isothiazolin-3-one(MI),was extensively used in industry as a nonoxidizing biocide or disinfectant.However,it would show adverse effects on aquatic life when it is discharged into surface water.In this study,the removal performance,parameter influence,degradation products and enhancement of subse-quent biodegradation of CMI-MI in UV/H2O2 system were systematically investigated.The degradation rate of CMI-MI could reach 90％under UV irradiation for 20 min when the dosage of H2O2 was 0.3 mmol·L-1.The DOC(dissolved organic carbon)mineralization rate of CMI-MI could reach 35％under certain conditions([H2O2]=0.3 mmol·L-1,UV irradiation for 40 min).kobs was inversely proportional to the concentration of CMI-MI and proportional to the concentration of H2O2.The degradation rate of CMI-MI was almost unchanged in the pH range from 4 to 10.Except the presence of CO32-inhibited the removal rate of CMI-MI,SO42-,Cl-,NO3-,and NH4+did not interfere with the degradation of CMI-MI in the system.It was found that UV/H2O2 system had lower energy consumption and more economic advan-tage compared with UV/PS system by comparing the EEO(electric energy per order)values under the same conditions.Two main organic products were identified,namely HCOOH and CH3NH2.There's also the formation of Cl-and SO42-.After UV and UV/H202 photolysis,the biochemical properties of CMI-MI solution were obviously improved,especially the UV/H2O2 treatment effect was better,indicating that UV/H2O2 technology is expected to combine with biotechnology to remove CMI-MI effectively and envi-ronmentally friendly from wastewater.
KathonUV/H2O2Biological degradationCirculating cooling water
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