Skip to main content

Differences in Aeration and Air Scour Energy Requirements between Membrane Bioreactors, Conventional Activated Sludge (CAS), Ifas and MBBR following Process Optimization

Buy Article:

$17.50 plus tax (Refund Policy)

Or sign up for a free trial

Abstract:

Hollow fiber membrane bioreactors (MBRs) were evaluated in full scale to study methods of reducing their aeration and air scour energy requirements. The changes were modeled to determine methods to optimize the aeration and air scour energy consumption and compare the total to the aeration energy requirements of conventional activated sludge (CAS), IFAS and MBBR systems. The research found that the aeration and air scour energy required for an MBR can be reduced to within 33% above conventional activated sludge (CAS) systems operating with 50 percent more volume (Aeration Optimized Mode, AOM). It can be reduced further to within 20% with automated DO and ammonium-N monitoring and control in the aerobic zone and the membrane cell, or at facilities which can discharge effluent ammonium-N above 0.5 mg/L during some weeks (Aeration Constrained Mode, ACM). The optimization techniques included reduction of the DO set point in the main reactor to 1 mg/L for AOM and 0.5 mg/L for ACM; reduction in the air scour on time from 100% to 25%. The air scour air flow rate was controlled such that it was just above 18 mm/sec during the on time. The combination of these two changes reduced the DO levels in the membrane cell from greater than 6 mg/L to less than 4 mg/L. The energy requirements for MBRs were then compared to other compact solutions such as IFAS and MBBRs. In the MLE process configuration and ACM, the MBR consumed 4 to 7% more aeration and air scour energy than IFAS and MBBR, respectively. In the Enhanced Nutrient Removal (ENR) mode, in which methanol is added to the post-anoxic cells to increase denitrification, the MBR consumed similar amounts compared to IFAS and MBBRs, with all processes achieving 4 mg/L Total Nitrogen (TN).

Document Type: Research Article

DOI: https://doi.org/10.2175/193864708788803532

Publication date: 2008-01-01

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 These proceedings are not peer reviewed.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