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INACTIVATION OF MS2 VIRUS IN DRINKING WATER: ATLANTIC ULTRAVIOLET CORPORATION MEGATRON UNIT, MODEL M250 AT CHULA VISTA, CALIFORNIA
Citation:
NSF International, Harza, AND San Diego. INACTIVATION OF MS2 VIRUS IN DRINKING WATER: ATLANTIC ULTRAVIOLET CORPORATION MEGATRON UNIT, MODEL M250 AT CHULA VISTA, CALIFORNIA. U.S. Environmental Protection Agency, Washington, DC, EPA/600/R-08/085, 2002.
Impact/Purpose:
to provide information
Description:
Verification testing of the Atlantic Ultraviolet Megatron M250 system was conducted over a 48-day period from 11/01/01 to 12/18/01. The feedwater to the ultraviolet (UV) unit during the testing was effluent from the Otay Water Treatment Plant (OWTP), a conventional plant with flocculation, sedimentation and dual-media filtration of Otay lake water. In the first part of the testing, microbial challenge tests were conducted on 11/14/01 at a flow rate of 350 10% gpm, lamp power of 100% and feed water UV-254 transmittance of 90.6%. During this experiment the log inactivation of MS2 virus ranged from 1.7 logs to 2.1 logs. During the second part of testing, the reactor was operated for a period of more than 27 days at a flow rate of 350 gpm 10% and 100% lamp power setting with cleanings occurring automatically every six hours. During the first 320 hours the following operating parameters were monitored regularly: flow rate, total flow, UV sensor readings, lamp cleaning frequency, lamp hours, lamp shut-down periods, system electric power consumption, operating pressure and the headloss through the UV unit. The data collected indicates that the system can operate reliably under these testing conditions.
Water quality data collected from both the UV feedwater and UV effluent included: temperate, pH, total alkalinity, hardness, total organic carbon (TOC), UV-254 absorbance, turbidity, true color, nitrate, iron, free chlorine, total chlorine and Heterotrophic Plate Count (HPC). No significant change in these water quality parameters was seen from the feedwater to the effluent water. It should be noted the HPC's were below the detection limit in both the feed and effluent water.