Abstract
Corrosion control is an important aspect of safe drinking water supplies. The effects of corrosion which may not be evident without monitoring are an important issue concerning both public health and economical aspects. Chemical stability parameters of water quality in water treatment plants in Baghdad city can improve drinking water quality. The treated water quality from water treatment plants in Baghdad city was investigated along the water flow path in this study. The water quality parameters related to chemical stability included temperature, alkalinity as mg/L CaCO3, calcium mg/L as Ca, pH and total dissolved solids (TDS) mg/L for different samples from WTPs within Baghdad city were investigated. The two water quality indices, Langelier saturation index (LSI) and the Ryznar stability index (RSI), were calculated in order to evaluate the chemical stability of the drinking water samples. The results of LSI and RSI of the effluents from Baghdad’s WTPs during 2000-2013 classified that corrosive water is produced and this indicates that the water is not safe for domestic use and will need the further treatment. The present study demonstrated the application of water stability indices in estimating/understanding the treated water chemical stability and appeared to be promising in the field of treated water quality management.
Highlights
This paper is to evaluate the stability of the water flowing in the distribution systems in Baghdad city from the existing water treatment plants
Water quality parameters from Baghdad’s WTPs compared with Iraqi and WHO drinking water standards are shown in Table 2, where the treated water is within these standards
2) Water quality affects the corrositivity of the treated water flowing from the WTPs into the distribution system in Baghdad city
Summary
Stability of water is the tendency of water to either dissolve or deposit minerals varying with its chemical ma-. Journal of Water Resource and Protection, 6, 1344-1351. Water that tends to dissolve minerals is considered corrosive and that tends to deposit mineral is considered scaling. Corrosive water can dissolve minerals like calcium and magnesium, can dissolve harmful metals such as lead and copper from plumbing utilities. Where scaling waters deposit a film of minerals on pipe walls and may prevents corrosion of metallic surfaces. If the scale deposition is too rapid, it can be harmful and can damage appliances, such as water heaters, and increase pipe friction coefficients, in extreme cases, scale may clog pipes. The most desirable water is one that is just slightly scaling [1]
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