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Disinfection of E. coli from Wastewater using a Non-contact type UV Photoreactor and Log Inactivation Index

비접촉식 자외선 광반응조를 이용한 하수 대장균의 살균과 Log 불활성화율 지표

Kim, Sunghong;Kim, Kyungmyun;Kim, Gwangil;Choe, Jaewan
김성홍;김경면;김광일;최재완

  • Received : 2015.12.09
  • Accepted : 2016.02.26
  • Published : 2016.04.15

Abstract

Disinfection of microorganisms using UV light is widely used in the field of water supply and wastewater treatment plant, In spite of high germicidal effect and relatively clean by-product, UV disinfection has fundamental defeat that is accumulation of fouling materials at the interface of water and lamp sleeve. Non-contact type of UV photoreactor which can avoid this fouling generation was developed and the experimental performance evaluation of the system was carried out in this study. Log inactivation rate of E. coli was selected as a disinfection index. The concentration of E. coli of second clarifier effluent was $8.2{\times}10^1-8.2{\times}10^3$ colony per mL and was well inactivated by the non-contact type of UV photoreactor. Under the UV intensity condition of $2.1-2.5mW/cm^2$, E. coli removal rate was observed in the range of 54 - 95% when the HRT was increased from 10 to 52 seconds. Experimental results showed that log inactivation of E. coli was proportional to UV dosage and $200mJ/cm^2$ of UV dose is expected for the 2.0 log inactivation of E. coli from the second clarifier effluent. Between the two parameters of UV intensity and contact time which are consist of UV dose, UV intensity was 4 times more effective than contact time.

Keywords

UV disinfection;non-contact type UV photoreactor;E. coli;log inactivation;wastewater disinfection

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Acknowledgement

Supported by : 조선대학교