ASSESSMENT OF PRODUCED WATER QUALITY FROM NASPHA OIL FIELD, KARAK, KHYBER PAKHTUNKHWA, PAKISTAN

Abstract

Study was conductedto analyze Assessment of Produced Water Quality from Naspha Oil Field, KARAK, KHYBER PAKHTUNKHWA, PAKISTAN. Samples were collected from numerous locations including main separator, pits inlet, mid, output and stream water points. pH, Total dissolved Solids and Electrical Conductivity were analyzed on spots and others were analyzed in the Laboratory by using standardized methods. The outcomes of physical parameters i.e., pH, Total Dissolved Solids and Electrical Conductivity, were ranged from 6.51-8.19; 28240- 49340 mg/l and 13.61-26.9µs/cm correspondingly. As per standards set by Pak-EPA pH values lies within the permissible limits and TDS and TSS were above the permissible limits. Results of chemical analysis in produce water samples specify that level of Ca, Mg, Na, Cl, F, average ranges i.e., 3657.4, 426.2, 1152.8, 22780 and 2.16 mg/L respectively. Fluorides were within permissible limit as per the guide lines of Pak-EPA. Heavy metal results showed that Cd, Mn, Ni, Fe, Cr, Pb, Cu, Zn and As average ranges is; 0.064, 1.228, 1.15, 1.46, 0.628, 0.82, 0.974,2.56 and 0.24 mg/l respectively. The results showed us that Ni and Pb were above permissible limits and all other heavy metals that are present in produced water lies within the permissible limits. Results from total oil and grease showed us that average TOG that was measured was 12.6 mg/l that is above the permissible limit as set by Pak-EPA. Taking all the aspects that we have gone through in this research we can conclude that, the produce water that is discharging into the main streams and contaminating the soil and ground water need to be treated before it released.