Comparison of Biomass Selection Between a Novel Membrane Bioreactor and Activated Sludge Process

$17.50 plus tax (Refund Policy)

Buy Article:

Abstract:

This study examined the performance of a novel type of submerged membrane bioreactor (MBR) system which utilizes polyethylene membrane of bigger pore size (mean around 18–28μm) than normal MBRs. The system utilizes plate and frame structure with gravitational effluent flow. Two such bench scale MBR systems (0.084m3 of mixed liquor volume each) with membrane thickness of 0.48cm and 0.25cm respectively have been operated under an SRT of 6 days for 300 days treating synthetic wastewater containing high molecular weight compounds. Another bench scale conventional activated sludge (CAS) system (mixed liquor volume = 0.03m3) has been running to make a parallel performance comparison. Biomass in three systems was studied based on their microscopic shape, as well as settling properties. While CAS system biomass grows well-flocculated bio flocs by settling/flushing-out selection, MBR with 0.48cm-thick membrane maintains most of the fine biomass flocs and forms bigger filamentous-bridging flocs with poor settling quality. Settling property of biomass from 0.25cm-thick MBR stays between the range of the above two. The difference of microbial species composition between MBR and CAS is also confirmed by Denaturant Gradient Gel Electrophoresis (DGGE) analysis. Discussion of biomass selection linked with system performance helps to understand and improve operation of this novel MBR process in the future.

Document Type: Research Article

DOI: http://dx.doi.org/10.2175/193864706783763075

Publication date: January 1, 2006

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 These proceedings are not peer reviewed.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
  • ingentaconnect is not responsible for the content or availability of external websites

Tools

Favourites

Share Content

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
X
Cookie Policy
ingentaconnect 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