Skip to main content

Accommodating Process Variation in the Design and Sizing Of Thermal Drying Facilities

Buy Article:

$17.50 plus tax (Refund Policy)

Or sign up for a free trial

Abstract:

The City of Wilmington's James A. Loughlin Wastewater Treatment Plant liquid and solids treatment trains are currently being designed for upgrade and expansion to 16-mgd capacity. Class A residuals management alternatives were investigated as a part of the preliminary engineering phase due to concerns over the long-term viability, risks and economics of the current Class B land application program. These preliminary investigations resulted in the selection of thermal sludge drying as the preferred Class A residual management alternative.

Specifically, this paper presents the following information related to the sizing and operating economics of the thermal drying facilities:



Development of the thermal dryer sizing design basis using an influence diagram process design model coupled with a Monte' Carlo statistical simulation. This model develops a design basis for total dry sludge production, water evaporation rate, and thermal dryer utilization rate.


Development of the thermal dryer economic cost model using an influence diagram model coupled with a Monté Carlo statistical simulation. This model examines both the incremental operating costs and the fully allocated costs for development of the thermal drying alternative as compared to the current Class B land application program


This approach for conducting the sizing and economic evaluations provides for the rapid and simultaneous consideration and evaluation of a combination of possible input variables on the key output performance criteria. Simulation results indicate that a thermal dryer with 4,000 kg per hour (8,800 lbs./hr) evaporative capacity would provide sufficient thermal drying capacity to eet process needs at the 16-mgd design flow condition. The economic evaluation simulation indicated that the incremental operating costs associated with thermal drying were less than the current Class B land application program operating costs, however, the fully allocated costs for thermal drying were greater than the current Class B land application program costs.

Document Type: Research Article

DOI: https://doi.org/10.2175/193864702784162444

Publication date: 2002-01-01

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