Journal of Environmental Biology

Impact of domestic sewage on fresh water body

N. Shiddamallayya*¹ and M. Pratima²

¹Regional Research Institute (Ay.), Ashoka Pillar, Jayanagar, Bangalore-560 011, India

²Dept. of P.G. Studies and Research in Botany, Gulbarga University, Gulbarga-585 104, India

(Received: February 02, 2006 ; Revised received: July 10, 2006 ; Accepted: August 29, 2006)

Abstract: In the present study, various (physico-chemical) factors were assessed over a period of two years (from February 2002 to January 2004) to note the chemistry and quality of tank water in Bhalki town of Bidar. Physico-chemical factors like pH, dissolved oxygen, magnesium, chlorine, nitrite, sulphates and chemical oxygen demand were found with maximum concentration during summer season. Similarly, during monsoon season free carbon dioxide, alkalinity, hardness, calcium, phosphate, silicon, total solids and biological oxygen demand; and in winter season organic matter were recorded. The concentrations viz., pH, hardness and nitrite were more compared to the potable water standard of WHO. The correlation matrix and dendrogram of physico-chemical factors have been computed and analysed. The positive co-relation coefficient observed between pH and magnesium, dissolved oxygen and hardness, free carbondioxide and calcium, alkalinity and nitrite, alkalinity and phosphate, alkalinity and biological oxygen demand, hardness and calcium, hardness and magnesium, magnesium and chlorine, nitrate and phosphate, nitrite and biological oxygen demand, phosphate and organic matter; and silicon and chemical oxygen demand. The dendrogram confirms chlorine, pH, hardness, silicon, total solids and sulphates are the key factors of the change in the chemistry of water body.

Key words:    Physico-chemical properties, Fresh water, Sewage, Pollution

PDF of full length paper is available with author (siddamallayya_matapati@rediffmail.com)

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