PRODUCED WATER OF SALSABIL GAS PLANT (SAFED KOH JV) ASSESSMENT AND TREATMENT THROUGH COAGULATION AND FLOCCULATION

Abstract

The present study is conducted to analyze the heavy metals intensity and physicochemical parameters concentration in produced water of Salsabile Gas Plant and also find out the economical treatment method of produced water which is coagulation flocculation on the bases of simple operating procedure and cheap chemicals. Produced water samples were collected from the study area by using standard protocol and procedures. pH, TDS and temperature were analyzed on site with portable instruments while rest of parameters including biological oxygen demand (BOD), chemical oxygen demand (COD), chlorides, aluminum, nitrate (NO3), oil and greases, sulphate, total dissolved solids (TDS), arsenic, cadmium, chromium, copper, iron, lead, mercury, nickel and zinc were analyzed in Pak EPA and Bahria University chemistry laboratory. Separator produced water sample pH, TDS, BOD, arsenic, chromium, nickel, lead, iron, copper and zinc concentrations were within Pak EPA permissible limit. Chloride, sulphate, oil and grease, COD and cadmium concentrations were noted 15463, 1595, 115.8, 188 and 3.2mg/l respectively which were above the permissible limit of Pak EPA. Similarly in drain pit produced water sample pH, TDS, BOD, arsenic, cadmium, chromium, nickel, lead, iron, copper and zinc concentrations were within Pak EPA permissible limit while chloride, sulphate, oil and grease and COD concentrations were fond above the Pak EPA permissible limit. By applying coagulation flocculation treatment on collected samples, with the increasing dose of ferric chloride with anionic polymer, we observed decreasing trend of all parameters. Best results were showed on 90mg/l ferric chloride with anionic polymer and filtered sample. In this treated water, all parameters concentrations were within Pak EPA permissible limit. It could be used for agriculture as well as for different industrial purposes.