Water System Design Manual, December 2009
Document source : www.doh.wa.gov
Page 300
December 2009
Water System Design Manual
Operations
As with all treatment systems, UV disinfection equipment requires regular monitoring and
maintenance. DOH has developed report forms for UV disinfection reporting that may be used
for operational records. If disinfection credit is granted, a water system must submit a report to
DOH on a monthly basis (WAC 246-290-480, 666, and 696). The following is a list of the
minimum monitoring and reporting requirements. Individual projects may require variations on
how these data are presented, however the elements identified below will be basic.
UV Disinfection Monitoring/Reporting Elements
Parameter
Monitoring Frequency
Reporting Requirement
Flow Continuous
Peak
Daily
Irradiance Continuous
Minimum Daily Value (Amount of
time below minimum allowable
levels if using sensor setpoint
control)
Dose Continuous
(Only applicable for calculated
dose control)
Minimum Daily Value if using
calculated dose control. (Amount of
time below minimum required dose)
UV Transmittance
(UVT)
Continuous
(Continuous UVT monitoring
only required for calculated
dose control. A daily grab
sample should be taken when
sensor set point control is used.)
Minimum Daily Value. UVT during
minimum calculated dose. Weekly
comparison to bench-top reading.
Date of most recent calibration
Power Continuous
Daily
Lamp
Status
OK
Lamp Change
N/A
Note monthly if lamp(s) changed
(min annually)
Lamp Operating
Time
Continuous
Monthly total hours
Alarms Continuous
Note
any
alarm conditions occurring
during the month
Cumulative Number
of Off/On Cycles
Continuous Monthly
total
Sensor Status
N/A
Monthly comparison of working and
reference sensors. Note when system
sensor calibrated by factory (min.
annually)
Summary :
UV Disinfection Monitoring/Reporting Elements Parameter Monitoring Frequency Reporting Requirement Flow Continuous Peak Daily Irradiance Continuous Minimum Daily Value (Amount of time below minimum allowable levels if using sensor setpoint control) Dose Continuous (Only applicable for calculated dose control) Minimum Daily Value if using calculated dose control.
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continuous,minimum,dose,daily,control,monthly,sensor,monitoring,disinfection,calculated,alue,time,system