Abstract
The quality of desalted water produced from a sea-water desalination plant was examined. The plant was of 39-stage flash evaporator of high flow-rate long tube design and the capacity of 3,000 m3/day. The water contained 0.1-0.3ppm of chloride ion, and its electric conductivity was as low as 2-4μ. It contained heavy metal ions (iron, copper, and zinc) derived from the condenser tube and the piping materials in the order of several tens of ppb, respectively. If polluted seawater is used for desalination, there will be the risk that the product water be contaminated with ammonia and organic substance (shown as COD value).
