[Study on the treatment of oilfield produced wastewater with different salinities using halophile enhanced biological activated carbon].

The treatment of oilfield produced wastewater with different qualities and different salinities were carried out using halophile enhanced biological activated carbon. COD, UV254 were detected as the index to indicate the efficiency of oilfield produced wastewater treatment. Oxygen Uptake Rate (OUR) was used to determine the activity of biofilm living in the activated carbon. The activity of biofilm presents a trend that is from reducing, resuming, to stabilizing with increasing of the proportion of oilfield produced wastewater. With HRT of 5 h, the removal rate of COD of Le'an and Xianhe oilfield produced wastewater achieves 64.86% and 53.62%, respectively. UV254 is partly removed, too. For Le'an oilfield produced wastewater with different salinities from 1.0% to 3.0%, the removal rates of COD are between 64.86% and 66.67%. The results illuminate that for the successfully domesticated microorganisms, only salinity's changing will not make distinct impact on them if the qualities of wastewater are not changed. The difference of COD in oilfield produced wastewater is the primary factor that makes influence on treatment effect for the different water quality.