An Assessment of the treated water quality for some drinking water supplies at Basrah

الملخص EN

In the present study, treated water samples are gathered from four drinking water supplies (Garma I, Al-Muwahad, Twenty five and Jubila) at Basrah during March, April, May and October / 2011, then ten chemical parameters are analyzed.

Anova test of variance shows no spatial variations for all studied chemical parameters except for Sulphate (< 0.05), free chlorine (< 0.05) and total chlorine (< 0.01) which reflect raw water quality in addition to treatment efficiency for each drinking water supply.

The difference in dosage of both chlorine and alum [AlK (SO4)2.

12H2O] added at each water supply leading to existence of significant spatial differences in free chlorine, total chlorine and sulphate .The whole study period assessment of treated water quality at water supply is achieved by the application of the CCME WQI model on all of the studied chemical parameters except total chlorine according to guideline values set by Iraqi standards (2001), World Health Standards WHO (1984) and WHO (1993), the results indicate that water quality can be rated as poor at both Garma I and Al-Muwahad water supplies respectively and as Marginal at both Twenty five and Jubaila water supplies respectively.

This deterioration in water quality for the studied water supplies reflects poor raw water quality that is supplied to them.