Skip to main content

ULTRASOUND FOR IMPROVED SOLIDS MANAGEMENT – HOW, WHO, WHEN AND WHY

Buy Article:

$17.50 plus tax (Refund Policy)

Or sign up for a free trial

The application of high intensity ultrasound has significant potential for improving biosolids management at treatment plants across North America. This paper provides a review of how the technology works, the potential applications at wastewater treatment plants, the different approaches being used by various suppliers, the state of development of the technology, and on-going work in North America and around the globe. Ultrasound is sound above the range of human hearing, with frequencies between 20 kHz and 10 MHz. At the lower end of this range, ultrasound generates cavitation bubbles when applied in a fluid, which implode creating high mechanical shear forces. This can be used for disintegrating solids in the fluid.

For wastewater applications it has been shown that ultrasound is most beneficial when applied on biological secondary solids, where rapid hydrolysis can be induced. Hydrolysis ofcellular material is usually the rate-limiting step in digestion. This provides advantages in anaerobic digestion, with increased volatile solids destruction and gas production, Improved dewaterability has also been observed at some installations. Improvements through reduction in biosolids volume and increased gas production can provide significant savings. Other applications of ultrasound include the potential for prevention of foaming caused by filamentous organisms.

Most of the work on ultrasound in wastewater applications has been done in Europe, In North America, California has been at the forefront of ultrasound development, with demonstrations conducted by Orange County Sanitation District and the Los Angeles County Sanitation District. The California Energy Commission has also supported a demonstration project at the City of Riverside for comparison of performance and cost effectiveness of two ultrasound manufacturers that use different treatment philosophies. Ultrasound technology is also being implemented in Australia and Singapore. This paper provides an overview of ultrasound system suppliers, existing installations, continuing developments in this field and guidance on when ultrasound technology may prove beneficial for improved solids management.
No Reference information available - sign in for access.
No Citation information available - sign in for access.
No Supplementary Data.
No Data/Media
No Metrics

Document Type: Research Article

Publication date: 2005-01-01

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