Skip to main content

Full Permeability Recovery of Dewatered MBR Membranes

The full text article is not available for purchase.

The publisher only permits individual articles to be downloaded by subscribers.

or click here to sign up for a free trial


Submerged membranes are subjected to unique fouling mechanisms that occur at the microscopic level and at generally controllable rates. However, in some cases, fouling can occur at the macroscopic level in the form of localized caking or dewatering of solids. Dewatered sludge can result in reduced performance, flux decline, high energy consumption (1) and require mechanical or manual cleaning to remove. The phenomenon of localized dewatering is not unique to one technology and generally results from a combination of poor screening, unequal flow splitting and insufficient air scouring at elevated MLSS concentrations.

The effects of dewatering (also called sludging or plugging) are fairly well documented for hollow-fiber membrane technology but not as well understood for flat-plate membrane equipment. Based on a survey of 130 North American facilities using flatplate membrane equipment, dewatering has been observed in 21 plants and generally occurs during the first year of operation only. Dewatering is usually isolated to specific reactors (not the whole plant) and its affects are short-lived. It is estimated that combined plant performance was impacted less than 0.6% of the time in service for plants surveyed. New chemical cleaning and mechanical cleaning methods are presented for addressing localized dewatering.

Keywords: Cleaning; Localized Dewatering; Membrane Bioreactor (MBR); Membrane Fouling

Document Type: Research Article


Publication date: January 1, 2010

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 These proceedings are not peer reviewed.

    WEF Members: Sign in (right panel) with your IngentaConnect user name and password to receive complimentary access.
  • Subscribe to this Title
  • Membership Information
  • About WEF Proceedings
  • WEFTEC Conference Information
  • Ingenta Connect is not responsible for the content or availability of external websites

Access Key

Free Content
Free content
New Content
New content
Open Access Content
Open access content
Subscribed Content
Subscribed content
Free Trial 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