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by dust accumulations. Elapsed operation time meters shall be provided
for each bank of ultraviolet lamps.
(F) Cleaning. Provisions for routine cleaning such
as mechanical wipers, high pressure sprayers, ultrasonic transducers,
or chemical cleaning agents are required. Quartz sleeve ultraviolet
systems shall have a chemical cleaning capability in addition to any
ultrasonic and/or mechanical wiper systems. Cleaning solution mix
and storage tanks shall have a volume of at least 125% of the reactor
volume to be cleaned. A spent cleaning solution disposal plan shall
be included in the engineering report.
(G) Safety. Operators shall be protected from exposure
to ultraviolet light during normal operations.
(H) Replacement parts. Replacement part provisions
shall be based on:
(i) the following table which summarizes minimum requirements
as a percentage of the total provided in the ultraviolet system; or
(ii) a minimum of one uninstalled spare module.
Attached Graphic
(3) Disinfection techniques not in widespread use,
such as ozonation, bromine chloride, and chlorine dioxide, will be
considered for approval on a case-by-case basis. Full details of application,
operation, and maintenance, and results of pilot and developmental
studies, shall be furnished to the commission by the design engineer
for each proposal.
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