Skip to main content

Refurbishment of an Aging Fluid Bed Biosolids Incinerator and Development of a 10 year Capital Plan: An Alternative to Replacement

Buy Article:

$9.50 plus tax (Refund Policy)

Or sign up for a free trial

The City of London, Ontario operates a 60 dry tonne/day hot wind box fluid bed incinerator (FBI) at the Greenway Pollution Control Centre (PCC) to dispose of the biosolids generated at all of its municipal sewage treatment plants. The incinerator was commissioned in 1988 and had been in continuous duty since, with the exception of annual maintenance shutdowns. Currently the incinerator runs 6 or 7 days per week, 24 hours per day.

In 2007, meetings and site inspections were completed at the request of the City to investigate potential repairs to their FBI. Numerous areas on the upper freeboard of the FBI were severely degraded and had been extensively previously patched. Historic non–destructive testing results indicated that in localized areas less than 50% of the original steel casing thickness remained on the incinerator freeboard. Based on the age of the facility (20 years of operation), preliminary analysis of the information available, and our experience at other similar installations, AECOM identified the likely need for much more extensive repairs than originally anticipated by City staff.

A detailed incinerator assessment was completed in 2007 which involved identifying the system components, reviewing and recording the past repair history, identifying critical process equipment, evaluating the current condition of process equipment using various non-destructive testing techniques, estimating the remaining life, estimating the repair costs of the critical process equipment, and generating a capital timeline and cash flow.

The Report evaluated a number of scenarios ranging from simple repair to refurbishment to replacement with a new incinerator and considered capital cost as well as operating impacts (downtime). An implementation plan consisting of staged repairs, including an initial 4.6 million refurbishment and a total 10 year capital repair cost anticipated to be 13.4 million was recommended. This compares to 32+ for a new incinerator (depending on ancillaries) and interim repairs to the existing unit during procurement and construction.

Based on the recommended scope of work, a construction methodology was developed and a construction contract was tendered. Included in the scope of the project was detailed design of new incinerator refractory, new incinerator upper sidewalls and roof steel, new incinerator refractory lined outlet ductwork, new air to air pre-heater, new flue gas re-heater, and modified venturi scrubber.

Work on the 4.6M project occurred from 2007 to 2009. Given the high cost of disposing of sludge during the downtime a major consideration was limiting the downtime to the extent possible. An innovative construction incentive approach, consisting of penalties and bonuses was used to obtain the optimum balance between capital cost and downtime operating costs. The innovative approach resulted in the project being completed ahead of time and below budget.
No Reference information available - sign in for access.
No Citation information available - sign in for access.
No Supplementary Data.
No Article Media
No Metrics

Keywords: Biosolids Thermal Treatment; FBI Refurbishment; Fluidized Bed Incinerator; retrofit

Document Type: Research Article

Publication date: 2011-01-01

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