Physicochemical and microbiological analysis of drinking water treated by using ozone

Subedi, D.P and Tyata, R.B and Khadgi, A and Wong, C.S (2012) Physicochemical and microbiological analysis of drinking water treated by using ozone. Sains Malaysiana, 41 (6). pp. 739-745. ISSN 0126-6039


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This study focused on the application of a Dielectric Barrier Discharge (DBD ) unit to produce highly oxidizing ozone molecules for the treatment of drinking water. The samples of water were collected from three different sources, namely tap, stone spout and tube-well in the Kathmandu valley. Various physical, chemical and micro-biological analyses were carried out to both the ozone treated and untreated samples of water for comparison. Our results indicated that ozone does not alter the physical characteristics, namely pH, conductivity and turbidity of water but it has significant effect on the chemical properties such as nitrate concentration, total hardness, calcium hardness, Fe(II) and Fe(III) concentration. It was observed that ozone efficiently precipitates ferrous ion into ferric ion and is effective in the removal of fecal coliform, a key element for various water related health problems in most of the developing countries. It is shown that the treatment with ozone leads to a significant reduction in the number of fecal coliform in the samples of drinking water from tap, stone spout and tube well with p values 0.00182, 0.026 and 5.8 ×10-15, respectively at 0.05 level of significance.

Item Type:Article
Keywords:Dielectric barrier discharge; ozone; water treatment
Journal:Sains Malaysiana
ID Code:4861
Deposited By: Mr Azam
Deposited On:25 May 2012 12:41
Last Modified:14 Dec 2016 06:37

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