Skip to main content

Replacement of a Multiple Hearth by a Fluid Bed Incinerator The Ypsilanti Sludge Disposal Case History

Buy Article:

$17.50 plus tax (Refund Policy)

Or sign up for a free trial

The incinerator at the Ypsilanti Community Utilities Authority (YCUA) wastewater treatment plant in Ypsilanti, Michigan was built to replace a 21 year old multiple-hearth, to satisfy the YCUA wastewater treatment plant expansion from 29 MGD to 46 MGD and therefore to comply with the State's updated more stringent air requirements. In 2000, an internal YCUA Committee concluded a study evaluating options for future municipal sewage sludge reuse and disposal. The study included reuse processes: agitated bay composting, pelletization, liquid land applications, alkaline stabilization, and two disposal processes: landfilling of dewatered sludge and incineration. The consensus was to continue incineration, replacing the existing multiple hearth incinerator (MHI) with new fluid bed incinerator (FBI) with modern air pollution control (APC) system. The decision was based on both economic and environmental reasons. Design of the new FBI system began in January 2003 and equipment delivery for the incineration system began in February 2004. Initial operation occurred in January 2006. Primary and secondary sludge, dewatered to 25% dry solids by belt filter presses, is delivered by piston pumps to the 24 foot freeboard ID fluid bed. A shell and tube primary heat exchanger recaptures heat from the exhaust gas and preheats the combustion ambient air to 1230° F, resulting in minimal auxiliary fuel use. The APC devices are a venturi scrubber followed by an impingement cooling tray tower for particulates and acid gas control, a wet electrostatic precipitator to polish particulate emission and a GAC adsorber for mercury and dioxins removal. The FBI system is also equipped with a secondary heat exchanger recovering the heat from the flue gas to preheat ambient air for stack plume suppression and for reheating the moisture laden exhaust gas prior to introduction to the GAC conditioner. Ash coming out of the air pollution control system in a slurry-form is pumped to an existing ash lagoon for settling and dewatering. The system includes a state of the art PLC system for computer control of the operation. YCUA is the first municipal plant in North America to use a GAC adsorber to remove mercury and dioxins from the FBI exhaust gas. Characteristics and performance of the GAC system are discussed in this paper.
No Reference information available - sign in for access.
No Citation information available - sign in for access.
No Supplementary Data.
No Data/Media
No Metrics

Keywords: FLUIDIZED BED INCINERATION; GRANULATED ACTIVATED CARBON ADSORBER; SLUDGE DISPOSAL

Document Type: Research Article

Publication date: 2007-10-01

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