Skip to main content


Buy Article:

$9.50 plus tax (Refund Policy)

Or sign up for a free trial

Minimal draining, decanting, and evaporative drying have been the predominant factors determining performance of the well known lagoon, conventional sand drying bed and evaporation bed process. Previously, the “rule of thumb” design procedure determined the sizing of these beds. Fortunately, more rational design factors were established from experience and published in “MOP 20, l983”, resulting in facilities with proper capacity.

Efforts to improve the under drainage in the bed type device have been made over the years, but none have been made as durable as the rigid, porous, epoxy- bonded, aluminum oxide surface which is guaranteed for 20 years.

Attempts at increasing the dewatering rate by applying pressure to the beds have been attempted but only vacuum has proven to be feasible. Early generations of the vacuum bed have applied 8 - l0" Hg, but the current design allows for 24 - 26" Hg vacuum. This has resulted in higher capacities and dryer cakes, in a shorter cycle time.

Case studies will be presented for this low energy, simple technology system that has over 18 years experience on various types of sludges at over 180 locations.

Prior thickening of water plant residuals and biosolids digestion is also addressed as being important for any type of drying bed and mechanical dewatering. Consideration must be given to the final disposition of the resulting cake, be that land filling or beneficial use.
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 2000

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 These proceedings are not peer reviewed.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