(740b) Integrated Forward Osmosis-Membrane Distillation Process for Sustainable Treatment of High Tds Produced Waters
AIChE Annual Meeting
Friday, November 2, 2018 - 8:25am to 8:50am
Experiments with raw and pretreated produced water, containing 57,000 mg L-1 TDS, were carried out in the integrated FO-MD system. Sodium chloride in de-ionized water was used as FO draw solution and was continuously regenerated using the MD system. Although the individual FO process had relatively high rejection to TDS and total organic carbon (TOC), these contaminants could also accumulate in draw solution after a long-term experiment. The MD process provided an effective rejection to contaminants in the draw solution after FO process and the integrated system revealed nearly complete rejection of TDS and TOC. Feed water was concentrated up to 50% in the hybrid system. Next, the concentrated feed was treated using an individual MD and was further concentrated up to 300,000 mg L-1 TDS under variety of operating conditions. The results of this study highlight the potential for employing FO-MD to treat high salinity wastewaters from unconventional gas extraction.