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Practical solution for usage of wastewater of desalination unit: Mobin petrochemical complex as strategic utility unit

Alireza Pakdel, Farshad Farahbod, Sara Farahmand

In this experimental study a suggested pretreatment process for the effluent wastewater from the desalination unit ofMobin Petrochemical complex in south of Iran is considered. The goals of this pretreatment process is softening the wastewater as much as possible to prepare the feed streamfor salt production units and also the first stage of processes related to zero discharge desalination (ZDD). The main parameters such as the effectiveness of three commercial mineral coagulants, Aluminum Sulfate, Al2 (SO4 )3 , Ferric Sulfate, Fe2 (SO4 ) and FerricChloride, FeCl3 , individually in removing of the total hardness, the optimized amounts of SodiumCarbonate and Sodium Hydroxide and the optimummixing rate of the first reactor are surveyed in the laboratory. Main properties of clarified produced water such as total hardness, alkalinity and total dissolved solid, pH, temperature, electrical conductivity, Calciumhardness andMagnesium hardness are evaluated in each run. Comparing the results reveals the optimumvalues of the main parameters.