Water Quality Analysis and Corrosion Potential in the Distribution Network Patna, Bihar

Abstract

Changes in water quality in drinking water distribution systems are complex and often result due to chemical and microbial processes. The chemical concentration of water quality reflects the deposition and erosion of the scale. It causes insignificant deterioration of water quality. This study determines the corrosion and scaling potential of drinking water in the distribution networks of water supply in Patna city, Bihar, India. For the determination of the physicochemical parameters, 92 water samples were collected from 46 points of the distribution network. Four parameters were analysed in situ namely temperature, electrical conductivity, pH, total dissolved solids, and the remaining parameters namely alkalinity, total hardness, calcium, magnesium, chloride, sulphate, nitrate, and iron was tested in the laboratory. Widely used equations namely Langelier saturation index (LSI), Ryznar stability index (RSI), Puckorius scaling index (PSI), Larson Skold index (LS), and Aggressive index (AI) was employed for calculations of corrosion and scaling potential of the water samples. LSI and RSI indicate 86.96% corrosive and only 13.04% scaling, PSI indicates 30.43% corrosive, LS indicates all water samples has low corrosive and AI indicates 71.74% water sample has moderate corrosive, and only 28.26% of the water sample has scaling tendency.