Patent ID: 8105488
Filing Date: 2012-01-31
Classification: C02F,Y02W,Y10S

Abstract:
1. A method for generating fracturing water from produced water: transferring produced water contaminated with slick water, methanol and boron into an anaerobic pond; holding the produced water in the anaerobic pond for at least a first mean residence time; transferring anaerobic pond effluent to an aeration pond; aerating the anaerobic pond effluent in the aeration pond for a second mean residence time; transferring aeration pond effluent from the aeration pond to a solid/liquid flocculation separator; and separating the aeration pond effluent with the solid/liquid flocculation separator to generate an aqueous effluent separated from a solids effluent; biologically digesting the aqueous effluent in a bioreactor until a desired concentration of methanol is obtained; transferring bioreactor effluent from the bioreactor to a reverse osmosis system; separating contaminants from bioreactor effluent with the reverse osmosis system, the reverse osmosis system passing at least some boron in its permeate; and removing the boron from the reverse osmosis permeate via a boron-selective removal process to obtain a desired level of boron in the reverse osmosis permeate.