Skip to main content

Look Mom, No Backwash Pumps! - Evaluation of a New Type of Membrane for Water Reuse

Buy Article:

$17.50 plus tax (Refund Policy)

Or sign up for a free trial


The West Basin Municipal Water District (California) supplies many industrial customers in Southern California with recycled water from several water recycling treatment facilities and pipelines. One such facility, the Juanita Millender-McDonald Carson Regional Water Recycling Plant, converts supplied Title 22 recycled water into 5.0 MGD of low-pressure boiler-feed and 0.7 MGD of cooling tower make-up water at a local petrochemical refinery. The existing treatment process uses pressurized microfiltration (MF) followed by reverse osmosis (RO). This paper documents a three-month onsite testing of a new type of pressurized MF system that claimed to be 1) more water efficient, 2) less mechanically complex, and 3) more energy efficient. The purported claims are based on an innovative air-assisted backwashing system that reduces the need for backwash water and eliminates the need for dedicated backwash pumps. The testing determined that the new membrane system was able to treat the Title 22 water to a comparable quality as the existing MF system without the need for the backwash pump, therefore the claim of treatment using a less mechanically complex system was verified. However, the claim for being more water efficient could not be substantiated as the pilot-tested system's overall water efficiency was no different than the existing MF system. The claim of greater energy efficiency could not be verified due to incomplete data.

Keywords: Microfiltration; pilot testing; recycled water; reverse osmosis pretreatment

Document Type: Research Article


Publication date: 2010-01-01

More about this publication?
  • Proceedings of the Water Environment Federation is an archive of papers published in the proceedings of the annual Water Environment Federation® Technical Exhibition and Conference (WEFTEC® ) and specialty conferences held since the year 2000. These proceedings are not peer reviewed.

    A subscription to the Proceedings of the Water Environment Federation includes access to most papers presented at the annual WEF Technical Exhibition and Conference (WEFTEC) and other conferences held since 2000. Subscription access begins 12 months after the event and is valid for 12 months from month of purchase. A subscription to the Proceedings of the Water Environment Federation is included in Water Environment Federation (WEF) membership.

    WEF Members: Sign in (right panel) with your IngentaConnect user name and password to receive complimentary access. Access begins 12 months after the conference or event
  • Subscribe to this Title
  • Membership Information
  • About WEF Proceedings
  • WEFTEC Conference Information
  • Learn about the many other WEF member benefits and join today
  • Ingenta Connect is not responsible for the content or availability of external websites
  • Access Key
  • Free content
  • Partial Free content
  • New content
  • Open access content
  • Partial Open access content
  • Subscribed content
  • Partial Subscribed content
  • Free trial content
Cookie Policy
Cookie Policy
Ingenta Connect website makes use of cookies so as to keep track of data that you have filled in. I am Happy with this Find out more