Skip to main content

Bio-Solids Process Enhancements Resulting From the Use of Hydrogen Peroxide for Hydrogen Sulfide Odor Control – The San Antonio Experience

Buy Article:

$9.50 plus tax (Refund Policy)

Or sign up for a free trial

The paper will present results of a trial initiated in February 2004 by the San Antonio Water System (SAWS) to quantify the impacts of hydrogen peroxide injection prior to dissolved air flotation thickening of wastewater sludges.

Since February 2000, the San Antonio Water System has successfully used iron salts (FeSO4) for odor and corrosion control in the Dos Rios Water Recycling Center (WRC) collection system. In May of 2003, the Dos Rios WRC began receiving about 300,000 gallons per day of a mixture of primary and waste activated sludges from SAWS' Leon Creek WRC. When the Dos Rios WRC facility started receiving sludge from Leon Creek, several negative impacts were observed. Operators immediately noticed a significant increase in sulfide odors from the DAF units treating the Leon Creek sludge. In addition, a 2–3% decrease in percent solids of combined Leon Creek/Dos Rios belt filter press dewatered sludge was observed. In addition, volatile solids reduction through the anaerobic digestion process decreased dramatically. Finally, an expected increase in methane production due to increased sludge volume was not realized.

In order to investigate the efficacy of hydrogen peroxide (H2O2) towards resolving these negative impacts, SAWS initiated a trial involving injection of H2O2 into the Leon Creek sludge line several minutes ahead of the DAF units. Impacts to be quantified were H2S odors, polymer usage, volatile solids destruction, methane production, and dewatering efficiency. Past experience had suggested that hydrogen peroxide may enhance the performance of flotation thickening and sludge dewatering, and may result in a reduction of polymer use. It had also been suggested that hydrogen peroxide (in the presence of iron salts) could potentially increase methane production through partial oxidation of organic compounds (e.g. lignins) in the sludge, which may be recalcitrant to anaerobic digestion. Finally, it was thought that the hydrogen peroxide residuals in the Leon Creek sludge would also react to regenerate the iron salts from the Dos Rios sludges and achieve additional odor control in a blend tank where Leon Creek and Dos Rios sludges are mixed.
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: 2006-01-01

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
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