Skip to main content

INNOVATIVE MODIFICATIONS TO ENHANCE PERFORMANCE OF AN EXISTING BIOSOLIDS FACILITY

Buy Article:

$9.50 plus tax (Refund Policy)

Or sign up for a free trial

The biosolids pelletizing facility processes digested sludge from the water reclamation facility. Digested sludge is dewatered using belt filter presses and pelletized using one of the two solids pelletizing trains. The pelletizing train consists of a furnace, dryer, and settling chamber. The off-gas emissions from each pelletizing train are treated through dual cyclones, a venturi scrubber-cyclonic separator, and a common regenerative thermal oxidizer (RTO) prior to discharge to the stack. The pelletized product is stored on-site in two silos and sold to a private firm for use as a fertilizer.

The existing biosolids pelletizing trains have process limitations. The existing venturi scrubbers have been in operation for more than 20 years and are in need of replacement. Both pelletizing trains cannot be operated simultaneously due to the flow limitations of the existing RTO and limits the production capacity. The current system utilizes a non-recirculating exhaust gas configuration, which results in higher operation and maintenance (O&M) costs.

Three system configurations of the exhaust recirculation project were evaluated to select the best configuration. The first configuration (configuration 1) evaluated the recirculation after the existing venturi scrubber/cyclonic separator and immediately ahead of RTO. The second configuration (configuration 2) evaluated the recirculation after the existing dual cyclones and immediately ahead of new venturi scrubber cyclonic separator. The third configuration (configuration 3) evaluated recirculation after a new impingement tray scrubber cooler.

The configurations were evaluated and ranked based on distinct criteria to select the best configuration. These criteria consisted of marginal capital costs, O&M costs, water usage, and natural gas usage. Based on the evaluation, the City selected configuration 1 as the best configuration to design and construct the exhaust gas recirculation project.

The exhaust gas recirculation modification will substantially benefit the facility by dramatically increasing production and reducing associated O&M costs. Based on the current annual production of 2,800 tons, the proposed system will provide an annual cost savings of approximately 77,000 per year with the operation of one pelletizing train and up to 98,000 per year with the operation of two pelletizing trains. Additional O&M savings can be achieved by increasing the facility thruput by processing additional solids from other municipalities and from escalating utility and chemical costs.
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 2007

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