Abstract
This study is concerned with the evaluation of the effect of Euphrates River water quality in Al-Samawa region duringthe period 1984-2003 on efficiency and reliability of reverse osmosis desalination systems by calculating the calciumsulfate scaling index depending on the following indicators: - TDS, Ca+2, Mg+2, Na+1, Cl-1, So4-2, HCO3-1. It wasfound from data analysis that this index for these units is greater than permissible limit. Also, the fitted relationshipbetween this index and TDS is logarithmic, i.e. this index varies more rapidly than TDS, and consequently it is morerepresentative to the water quality than TDS.
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