Successful Pilot Trial to Recycle Petrochemical Wastewater using External Membrane Bioreactor in Combination with High Efficiency Reverse Osmosis
International Water Conference 2010
Abstract: An existing petrochemical plant in Middle-East desires to recycle its process wastewater after appropriate treatment for reuse as partial make-up to their demineralization system. The current practice for their wastewater management is to remove free oil through a gravity separator unit followed by pumping it to an independently owned centralized wastewater treatment facility in the area treating
wastewater from other industries as well. The plant wastewater is characterized by the presence of oil, ammonia nitrogen and high chemical oxygen demand (COD). The COD to biochemical oxygen demand (BOD) ratio at more than 3:1 indicated resistance to biodegradability. Aquatech proposed a pilot trial for this wastewater using an external membrane bioreactor process followed by a high efficiency RO process to meet client’s objective. The pilot trial was successful in removing more than 90% COD in the wastewater through the enhanced membrane bioreactor. Subsequent processing through high efficiency RO system resulted in achieving 90% recovery of RO permeate on consistent basis. The quality parameters of RO permeate were suitable for its use as feed water to the demineralizer unit. Based on the positive results of the pilot trials, the client is actively considering implementation of full scale wastewater treatment and recycle plant using this technology solution.
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