Assessment of The efficiency of Treated Water Inlet to Resin Unit of Steamed Electric Power Plants

Abstract

A potential problem with deionizers is that colonies of microorganisms can become established and proliferate on the nutrient-rich surfaces of the resin,The adherence of microorganisms to the resin structure would prevent any adhesion of mobile ions to the resin and pass to the boiler and effect on its efficiency. The aim of this study was to assess the bacteriological and physicochemical quality of water inlet to ion exchange unit (resin unit) seasonally at two steamed electric power plants in Shoubra El-Khiema (SH) Cairo Egypt and Damietta (D). Four water samples from each of the Nile water Input on the treatment unit and the Water output from the treatment unit (Input resin unit) were collected seasonally during the period of (Autumn 2011 to Summer 2012) from each two steamed electric power plants (SH) & (D) and analyzed bacteriologically for(heterotrophic plate count (HPC) at two incubation temperatures ,22°C and 37°C, for total coliforms (TC), feacal coliforms (FC) ,Feacal streptococci (FS) and Pseudomonas aeruginosa (P.aeruginosa) and as well as physicochemical analysis. Results showed that for bacteriological analyses the highest values of (HPC) at two incubation temperatures (22°C and 37°C), TC, FC, FS and P. aeruginosa during Summer at inlet River Nile of the two plants, but decreased to a significant differences in water inlet to ion exchange unit at the two plants. For physicochemical analysis the highest total dissolved solids (TDS) value of water inlet to ion exchange unit exceeded permissive limit of D. plant. The highest Total organic carbon (TOC) of water of each inlet River Nile and inlet to ion exchange unit of Sh. plant were 29.5 and 27.5 respectively. The highest mean values of electric conductivity of water inlet to ion exchange unit of D. plant exceeded permissive limit. It was noticed that the increase of the highest Sulphate mean values in water inlet to ion exchange unit at (SH) and (D) plants than permissive limits. Also it noticed that the increase of the highest Na+ ion value of water inlet to ion exchange unit than inlet River Nile and exceed the permissible limits of Sh. plant. Also the highest K+ ion value of water inlet to ion exchange unit exceed that of River Nile of Sh.plant. The results showed high contamination in water inlet to ion exchange unit and this affect on the resin unit efficiency.