Transcription of Drinking Water Tech Tips: Chlorine Contact Time for Small ...
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Drinking Water Tech Tips: Chlorine Contact Time for Small ...
Drinking Water Tech Tips: Chlorine Contact Time for Small Water Systems 331-343 Updated July 2016 This Tech Tip is a field guide to help surveyors understand the concept of Chlorine Contact time. You should not use it for design purposes. Washington state Drinking Water rules (WAC 246-290-451) establish minimum Chlorine Contact times for Water sources requiring disinfection. If your Water system is required to disinfect and meet Chlorine Contact time, you must have a professional engineer prepare and submit a project report for our review and approval. To inactivate viruses and bacteria using free Chlorine , the disinfection treatment required before the first customer must be at least 6 milligrams- minutes per liter (6 mg-min/L). This value is commonly referred to as CT.
chlorine residual concentration or the contact time. For example, if water at the entry point to the distribution system has a free chlorine residual of 0.5 mg/L and the chlorine is in contact with the water for 10 minutes between chlorine injection and entry point to the distribution system, CT is 5 (0.5 mg/L x 10 min = 5 mg-min/L).
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