Skip to main content

Membrane Bioreactors for RO Pretreatment

Buy Article:

$17.50 plus tax (Refund Policy)

Or sign up for a free trial

Abstract:

Currently, treated municipal wastewater is typically discharged to the environment in most parts of the world. It is, however, a potential water resource from which high quality water for reuse can be produced. Reuse applications include both non-potable applications such as irrigation and production of industrial process water, and indirect potable reuse including aquifer recharge. For many reuse applications, effluent from conventional wastewater treatment plants is frequently further treated by reverse osmosis (RO) to reduce the total dissolved solids in the effluent for water reuse applications.

There are some major challenges for RO systems operating on biologically treated wastewater. One challenge is plugging of the brine spacer due to high levels of suspended solids in the feed. Many RO systems today use ultrafiltration (UF) as pretreatment to remove suspended solids. The UF system does an excellent job of providing water with low suspended solids as to feed RO. However, the UF system requires additional space and does not effectively reduce the amount of dissolved solids such as organics that are fed to an RO system. The UF system can also be susceptible to upsets from a conventional wastewater treatment plant.

Instead of separating the biological treatment process and the ultrafiltration step, the latest wastewater treatment plants combine both processes in a membrane bioreactor (MBR). The membranes are integrated right into the aeration tank of the biological process. Advantages of this process are that a clarifier is no longer needed, and the effluent quality is considerably better, which improves RO performance. Additionally, the MBR process reduces footprint significantly compared to the combination of wastewater treatment followed by membrane filtration.

This paper discusses the challenges of using RO membranes for water reuse and the benefits of using MBR in comparison to UF as pretreatment for RO. The paper highlights examples of MBR systems providing RO pretreatment today. This paper also reviews cost factors for different pretreatment alternatives technology, and discusses factors that should be considered when deciding the optimum treatment train for a water reuse plant.

Document Type: Research Article

DOI: https://doi.org/10.2175/193864706783775586

Publication date: 2006-01-01

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
X
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