Journal :   Asian Journal of Research in Chemistry

Volume No. :   7

Issue No. :  1

Year :  2014

Pages :   11-18

ISSN Print :  0974-4169

ISSN Online :  0974-4150


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Physico-Chemical and Microbiological Study of Piped Water Distribution Systems in an Urban City

Address:   S. D. Garway1*, Dattatraya G. Garway1, M. Raina2 and G.H. Pandya3
1Research and Development Division, Anacon Laboratories, 60, Bajiprabhu Nagar, Nagpur 440 033 (India)
2Director-Scientist-F, Ministry of Environment Forests, Govt. of India, New Delhi (India)
*Corresponding Author

The water distribution system is a critical component of every drinking water supply authority. Its primary function is to provide the required water in quantity and quality to the consumers. Although, water is treated before supply to the consumers, it gets degraded during its distribution. It may undergo chemical and biological reactions during distribution because of leaks and improperly maintained storage facilities. Special problems arise at the consumers tap due to improper plumbing, which is not under the control of the municipal authorities. Most of the distribution systems are aging and becoming more vulnerable to breaks and leaks because they are underground and out of sight. The purpose of this paper is to: (1) identify trends relevant to the deterioration of drinking water quality in water supply distribution systems in various zones of the city, (2) identify and prioritize issues of greatest concern for distribution systems, and (3) apply Total Coliform Rule for microbial examination of water samples, (4) study raw water undergoing treatment at various treatment plants in the city and analyse water stored at various reservoirs (5) monitor the water supply system in 10 zones of the city. More than 3000 samples were analysed in monsoon season. Samples with Total coliform count greater than 16 are considered as “Unfit” for drinking purpose. It is observed that the Total coliforms are >16 in the raw water received at the water treatment plants. Further, the samples were analysed for Thermotolerant count and the samples tested positive for the months of June and September respectively. The results indicate that during the routine monitoring, total coliform count in eight zones of the City exceed the TCR criteria of EPA. After initiating actions of proper chlorination improvement in microbial quality of six zones were observed. Improvement in water treatment at various stages of water treatment plants was also observed. There was a dramatic reduction in Gastroenteritis cases in the city from 786 in 2007 to 157 in 2008. The above surveillance study clearly indicates that there is a substantial improvement in water quality in the distribution system, which confirms with the observation of Health Department of Nagpur Municipal Corporation that the large proportion of disease cases was waterborne. Some factors contributing to contamination of water and methods to control growth of microorganisms in the pipes are also discussed
piped water, microbiology of water, total coliforms, thermotolerant, urban water supply.
S. D. Garway, Dattatraya G. Garway, M. Raina, G.H. Pandya. Physico-Chemical and Microbiological Study of Piped Water Distribution Systems in an Urban City. Asian J. Research Chem 7(1): January 2014; Page 11-18.
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