Environmental impact assessment for evaluation of chemical, ecological, and economical consequences of using NNPS for sea water desalination

The study survey was done to select three desalination intake sampling sites to be used for the National Nuclear Power Plants (NNPs) desalination units. Different physicochemical analysis was done for the collected samples. Study results showed that there is an increment of the mean average concentrations of the measured TDS, Chlorides, Hardness, and sulfates values of the selected Sidi Kirir desalintion intake site than other Al-Alamin and Sidi Abdelrahaman sites, which are leading for consume large amounts of anti-scaling chemicals (as polyphosphates) at this site than the others. It was observed that the ecological risks which resulted from the use of polyphosphates as anti-scale formation were more higher in chemical risks than the use both of the hydrazine and benzatriazole anticorrosion chemicals. Study results showed that the using of benzatriazole will produce lesser ecological risks on marine living organisms than the using of hydrazine anticorrosion chemical. On the other hand the study recommended the using of Quater phenyl as non oxidizing biocide where its results showed lesser ecological effects (LC50 & EC50), than which being resulted from the using of chlorine dioxide (oxidizing biocide). The using of the economical risk code (DEEP) showed that the nuclear plant with Reverse osmosis (RO) desalination unit had the lowest water cost value than the other nuclear power plants, which are using both of the Multiple Effects Desalination (MED) and Multiple Stage Flash (MSF) desalination types, while the analytical physicochemical and corrosion index results showed that the RO desalination unit will be exposed to more corrosive and scale formation impacts than the using of both of MED and MSF desalination types. The study recommend the using of both MED & MSF desalination units, on the other hand, study showed that both MED & MSF units had less corrosive and scale formation impacts on the studied nuclear desalination power plant than the using of RO desalination unit.