Method of removing dissolved oil from produced water

摘要

A process for removing dissolved and undissolved oil and chemical additives from waste and/or produced water streams involves contacting a first gas with the produced water stream, the first gas utilizing hydrogen bonding and dipole interactions with the contaminants to remove them from the water. The rise rate of the first gas is accelerated by mixing a second, more buoyant gas with the first gas. The first gas and second gas are recovered by the application of a vacuum to the waste stream after treatment. The first gas is separated from the second gas by compressing and cooling the combined gas stream, venting the majority of the second gas stream while the first gas is liquified, then expanding the first gas before returning it to the flotation vessel. The first and second gases are mixed with the contaminated water stream at line pressure so that mixing is intimate and flotation is accelerated.