Modelling of chlorine decay in municipal water supplies

This paper describes the effects which temperature and the initial chlorine concentration have on the chlorine decay in different water samples. It also reports the derivation of empirical formulae which describe these effects. The data show that chlorine decays more rapidly in fresh samples than in...

Full description

Saved in:
Bibliographic Details
Published in:Water research (Oxford) 1999-08, Vol.33 (12), p.2735-2746
Main Authors: Hua, Fang, West, J.R, Barker, R.A, Forster, C.F
Format: Article
Language:English
Subjects:
Applied sciences
chlorine concentration
chlorine decay
decay equation
Drinking water and swimming-pool water. Desalination
Exact sciences and technology
Pollution
temperature
water quality
Water treatment and pollution
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:This paper describes the effects which temperature and the initial chlorine concentration have on the chlorine decay in different water samples. It also reports the derivation of empirical formulae which describe these effects. The data show that chlorine decays more rapidly in fresh samples than in those which had been re-chlorinated with sodium hypochlorite to give a concentration of about 0.5 mg/l. The decay constants were found to be inversely proportional to the initial chlorine concentration in the former case and to the concentration added in the latter case. A combined first and second-order model is described which describes the decay more precisely than the conventional first-order model. Specifically, it shows that the chlorine decay is influenced by its initial concentration and explains why chlorine decays more rapidly in the initial stages. It also explains why the decay constant in the first-order model varies with the initial chlorine concentration.
ISSN:0043-1354
1879-2448
DOI:10.1016/S0043-1354(98)00519-3