Performance of Instrumentation and Control Upgrades to Multiple Hearth Furnace in Anchorage, Alaska
Abstract:The Anchorage Water and Wastewater Utility (AWWU) made instrumentation and process control upgrades to its six-hearth multiple hearth furnace (MHF) at the J.M. Asplund Wastewater Treatment Facility (AWWTF) located in Anchorage, Alaska. The MHF operation was experiencing intermittent problems with the occurrence of opacity and visible emissions, increased maintenance requirements on some furnace equipment, and increased operational costs due to energy consumption. AWWU undertook construction projects in 2005 and 2007 to address these issues. This paper summarizes the performance of the upgrades. The improvements have resulted in a combustion process that is significantly easier to operate with much fewer emissions. Off-shift staffing was reduced from three operators to two operators. Emissions have been reduced up to 90% from the previously estimated discharge rate.
Document Type: Research Article
Publication date: January 1, 2008
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