Wednesday 11:00 AM
[Presentation PDF]

Room: Sapphire

Evaluating the Impact of Reverse Osmosis Treatment on Finished Water Carbon Dioxide Concentration and pH

Reverse osmosis (RO) technology for municipal water treatment facilities is rapidly becoming more common. The RO process separates an influent stream into two streams, a purified permeate stream and a concentrated brine stream. The RO process is capable of removing dissolved solids including the bicarbonate ion, while dissolved gasses such as carbon dioxide may pass through the membrane with little to no removal. This combination results in an aggressive permeate stream with a lower pH than the influent stream. This permeate stream is then blended with the influent stream to produce the desired finished water quality. Post-treatment typically consists of carbon dioxide stripping and/or chemical adjustment to adjust pH and stabilize the finished product and prevent distribution system corrosion. This presentation will discuss the RO process, aqueous chemistry with emphasis on carbonate species and pH as applicable to the RO process, and post-treatment methods.

Moderator:  Brian Hackman


Jerry Phipps, P.E. - HR Green, Inc.

Jerry Phipps, P.E. is a Project Engineer with HR Green, Inc.  Jerry has a bachelor’s degree in chemical engineering and master’s degree in environmental engineering from the University of Iowa.  Jerry has over 11 years of experience and has been with HR Green since 2006.  Jerry is involved with permitting, design, bidding and construction of municipal and industrial water and wastewater treatment plants in the Midwest.  Prior to joining HR Green, Jerry worked for a water treatment equipment manufacturer and regularly worked on RO applications including pre-treatment and post-treatment.