X hits on this document

Powerpoint document

Water Lecture 3 A. Disinfection B. Water Safety Plans - page 20 / 47

105 views

0 shares

0 downloads

0 comments

20 / 47

Disinfection Activity and the CT Concept

Disinfection activity can be expressed as the product of disinfection concentration (C) and contact time (T)

Assumes first order kinetics (Chick’s Law) such that disinfectant concentration & contact time have the same “weight” or contribution in disinfection activity and in contributiong to CT

Example: If CT = 100 mg/l-minutes, then

If C = 10 mg/l, T must = 10 min. in order to get CT = 100 mg/l-min.

If C = 1 mg/l, then T must = 100 min. to get CT = 100 mg/l-min.

If C = 50 mg/l, then T must = 2  min. to get CT = 100 mg/l-min.

So, any combinationof C and T giving a product of 100 is acceptable because C and T are interchangable

The CT concept fails if disinfection kinetics do not follow Chick’s Law (are not first-order or exponential)

Document info
Document views105
Page views105
Page last viewedSat Dec 03 06:51:29 UTC 2016
Pages47
Paragraphs681
Words3050

Comments