Skip to main content

Pulse Aeration of Secondary Aeration Tanks Holds Energy Saving Potential without Compromising Effluent Quality

Buy Article:

$17.50 plus tax (Refund Policy)

Or sign up for a free trial

Abstract:

Results showed no serious effluent quality deterioration when continuously air-mixed anaerobic and anoxic quadrants of the San Jose/ Santa Clara Water Pollution plant's secondary aeration systems were operated in pulse aeration mode. Ammonia concentrations in pulse aerated and continuously aerated tanks were, on average, 0.73 mg/l and 0.63 mg/l, respectively. Such a slight increase in ammonia concentration in pulse aerated tanks was inevitable with reduction in air flow to Quad 3, although the final effluent quality was never affected. Nitrite concentrations were on average 0.15 mg/l and 0.17 mg/l in the pulse aerated and non pulsed tanks, respectively. Nitrate was significantly reduced from an average concentration of 7.26 mg/l in continuously aerated tanks to 4.45 mg/l in the pulse aerated tanks. Phosphate levels in the effluents of pulse aerated experimental tanks were found to be higher than those in continuously aerated control tanks with averages of 2 mg/l and 1.5 mg/l, respectively. No significant difference was observed in mixed liquor suspended solids concentrations between pulse aerated and continuously aerated tanks, signifying that the chosen pulse aeration cycle of 1.5 min ON/10.5 min OFF was, indeed, sufficient to keep solids in suspension. Tanks with pulse aerated anaerobic and anoxic compartments produced final effluent as superior in quality to the NPDES permit requirements as those that were not pulse aerated. The study demonstrated implementation of pulse aeration in anaerobic and anoxic quadrants would result in 13% less total aeration demand with associated annual energy saving potential close to 430,000.

Keywords: aeration energy saving; anaerobic; anoxic; effluent quality; pulse aeration; solids mixing

Document Type: Research Article

DOI: https://doi.org/10.2175/193864709802769993

Publication date: 2009-01-01

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 These proceedings are not peer reviewed.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