Treatment of Real Produced Water By An Indigenous Halophilic Consortium in A Membrane Bioreactor

In the present study, a soil-based halophilic consortium was used to treat the pw of the ahvaz 2 oilfield desalination unit in a membrane bioreactor# the bioreactor was set up in eight phases for 165 days with an average srt of 100 days# in the first two phases in which the nitrogen and phosphorus compounds were added to pw, with a reduction in hrt from 48 to 24 hours, cod removal efficiency increased from 14#8% to 23#4% and toc removal efficiency increased from 74#5% to 79#4%# results showed that addition of yeast extract at the concentration of 0#01% increased the cod removal efficiency to 33% and reduced toc removal efficiency to 76#2%# by increasing the concentration of yeast extract to 0#03%, the cod and toc removal decreased slightly despite a significant increase in the microbial population# in the fifth and sixth phases which membrane bioreactor output from phases 3 and 4 was used as the bioreactor feed, the results showed that doubling the hrt (while at the same time average olr only decreased by 28%) cod and toc removal were increased in the range of 4 to 10%# addition of glycine betaine to the output of phase 2 (as feed of bioreactor) as a compatible solute at the concentration of 1 mm increased the cod and toc removal efficiency by 9#3% and 10#1%, respectively# increasing the glycine betaine concentration to 5 mm, significantly increased the microbial population, while the cod and toc removal decreased compared to phase 7#