Skip to main content

Characterization and Comparison of a Membrane Bioreactor and a Conventional Activated-Sludge System in the Treatment of Wastewater Containing High-Molecular-Weight Compounds

Buy Article:

$22.00 plus tax (Refund Policy)

The performance and characteristics of a membrane bioreactor (MBR) and a conventional activated-sludge system (AS) fed wastewater containing casein and starch were compared. Except different solids retention times (20 days for AS, 30 days for MBR), the systems were operated under identical conditions. Approximately 99.0% chemical oxygen demand and 96.9% dissolved organic carbon removal were achieved in the MBR compared to 94.5 and 92.7% in the AS. Both systems showed effective nitrification and phosphorus utilization. The MBR sludge was composed of small flocs; free swimming bacteria; and a small number of filamentous organisms, nematodes, and ciliates. The AS sludge was composed of larger flocs and higher amounts of filamentous organism and nematodes. The biomass in the MBR had a higher viable fraction than the AS. Enzymatic activity tests showed that (1) overall activity was consistently higher in the MBR, (2) both systems produced enzymes specific for the degradation of feed chemicals, (3) no enzymes were detected in the MBR effluent compared to significant amounts in the AS, and (4) the MBR contained more enzymes in the soluble phase than the AS. Particle size distribution tests verified that the AS sludge contained large flocs, while the MBR sludge contained primarily small flocs. The specific resistance of the MBR sludge was three orders of magnitude higher than the AS. The AS sludge showed better settleability than the MBR.
No Reference information available - sign in for access.
No Citation information available - sign in for access.
No Supplementary Data.
No Article Media
No Metrics


Document Type: Research Article

Publication date: 01 January 1999

More about this publication?
  • Water Environment Research (WER) is published monthly, including an annual Literature Review. A subscription to WER includes access to the latest content back to 1992, as well as access to fast track articles. An individual subscription is valid for 12 months from month of purchase.

    Water Environment Research (WER) publishes peer-reviewed research papers, research notes, state-of-the-art and critical reviews on original, fundamental and applied research in all scientific and technical areas related to water quality, pollution control, and management. An annual Literature Review provides a review of published books and articles on water quality topics from the previous year.

    Published as: Sewage Works Journal, 1928 - 1949; Sewage and Industrial Wastes, 1950 - 1959; Journal Water Pollution Control Federation, 1959 - Oct 1989; Research Journal Water Pollution Control Federation, Nov 1989 - 1991; Water Environment Research, 1992 - present.
  • Editorial Board
  • Information for Authors
  • Submit a Paper
  • Subscribe to this Title
  • Membership Information
  • Information for Advertisers
  • WEF Bookstore
  • 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