| (a) Each gaseous chlorine disinfection and sulfur dioxide
dechlorination system must include the number of cylinders required
for normal operation at peak flow, plus at least one additional cylinder.
(b) Gaseous chlorine disinfection systems and sulfur
dioxide dechlorination systems must include a device that automatically
switches between cylinders in a manner that ensures continuous disinfection
and dechlorination.
(c) A wastewater treatment facility must have sufficient
space to store at least as many empty cylinders as the number of cylinders
required for normal operation at peak flow.
(d) A gaseous chemical delivery system must meet the
pounds per day requirements in §217.272 of this title (relating
to Capacity and Sizing of Gaseous Chlorine Disinfection and Sulfur
Dioxide Dechlorination) when the largest chlorinator, sulfonator,
or evaporator is out of service.
(e) If an injector water supply requires a booster
pump, a duplicate backup pump is required.
(f) A gaseous chemical delivery system must include
an emergency power source capable of operating the chlorination and
dechlorination systems during an extended power outage, in accordance
with §217.36 of this title (relating to Emergency Power Requirements).
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