| (a) An ultraviolet (UV) system shall continuously monitor
and display the following information on the system control panel:
(1) the flow rate in each disinfection channel;
(2) the relative intensity of the lamps in one bank
of a disinfection channel;
(3) the operational status and condition of each bank;
(4) the on or off status of each lamp in the system;
(5) the number of operating hours of the lamps in each
bank in the system;
(6) the total number of hours of operation for each
bank in the system; and
(7) the transmissivity of UV light in the disinfection
channel.
(b) Flow pacing is required and shall be accomplished
by automatically turning the appropriate number of banks on or off
in proportion to effluent flow. Set points used to energize the banks
must be adjustable.
(c) A UV system must include an alarm system.
(1) A wastewater treatment facility that is not supervised
24-hours per day must have a telemetry system with battery backup
as part of the alarm system. A telemetry system must notify a wastewater
treatment facility operator in the event of a UV alarm and must distinguish
between major and minor alarms.
(2) A UV system must include the following minimum
alarm conditions:
(A) A minor alarm must activate if:
(i) the UV intensity of the system is less than 45%,
relative to the peak intensity after 100 hour burn in; or
(ii) there is a lamp outage.
(B) A major alarm must activate if:
(i) the UV intensity of the system is less than 25%,
relative to the peak intensityafter 100 hour burn in;
(ii) more than 10% of the lamps fail;
(iii) there is a loss of flow signal upon failure of
a bank to energize;
(iv) there is an outage of any module or bank; or
(v) the transmissivity is low, based on the manufacturer's
recommendations.
|
