High Water Recovery and Reduction of Chemical Oxygen Demand (COD) in Industrial Wastewater
A major US consumer goods producer generates wastewater with chemical oxygen demand concentrations (COD) of approximately 15,000 mg/l. The customer wanted to reuse 90% of the wastewater with a maximum COD value of 2,000 mg/l in the treated product. These criteria could not be met using traditional polymeric membranes because the elevated concentration of surfactants in the feed water would lead to rapid fouling and require high frequency cleaning cycles. The pre-treatment system necessary to mitigate fouling of polymeric membranes was capital intensive and expensive to operate for the target flow rate of 100,000 gallons per day.