Effect Of Preozonation And Prechlorination On
Total Organic Carbon Removal In Surface Water
Treatment In Iran
Author(s)
A. Torabian, A. A. Ghadimkhani, A. Rashidi Mehrabadi,
M. Shokouhi & R. Heidarzadeh
Abstract
In drinking water treatment, prechlorination and preozonation are often applied
in order to control micro-organisms and taste and odour causing materials, which
may influence organics removal by pre-oxidation and adsorption.
Using commercial and natural water humid substances, the positive effect of
prechlorination and preozonation as an aid to coagulation-flocculation of these
compounds were confirmed by the removal of total organic carbon (TOC). These
experiments were conducted at bench-scale through a series of jar tests using
different pH, coagulant dosage and TOC concentration of approx. 4, 8 and
12 mg/l. In addition to TOC removal, the existence of an optimum preozonation
dose and an optimum prechlorination dose were also confirmed. Experiments
show that prechlorination and preozonation can improve coagulation and
flocculation depended on TOC concentration of influent surface raw water. The
results demonstrate a differential effect between prechlorination and
preozonation on removal of TOC. Preozonation showed a positive effect on a
system with low influent TOC and very low molecular weight (noncolloidal)
humic substances.
Keywords: prechlorination, preozonation, TOC, surface raw water,
preoxidation.
1 Introduction
In the early 1900s, the United States’ drinking water industry drastically reduced
the number of fatal waterborne disease outbreaks when it began chlorinating
Keywords
prechlorination, preozonation, TOC, surface raw water,
preoxidation.
Related Book
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