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Lessons Learned (and Lessons Shared) from the Town of Cary's Dewatering and Thermal Drying Facility

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The Town of Cary completed construction and commissioning of a large biosolids dewatering and thermal drying facility located at the South Cary Water Reclamation Facility in 2005. This facility was designed to accommodate the dewatering and thermal drying of residuals generated at both the North Cary and South Cary Water Reclamation Facilities with an average daily operating throughput of approximately 24 dry tons per day.

This paper describes the key design, permitting, start-up and initial operational issues associated with the dewatering and thermal drying facility. The following topics are covered in detail:



Discussion of system sizing and design issues associated with the development of an integrated dewatering and thermal drying facility capable of serving residuals generated from both facilities


Air permitting for the thermal drying facility with a specific emphasis on utilizing North Carolina's “Notice of Intent to Construct” provisions which allowed construction activities on the thermal drying facility (emissions source) to proceed while the final air permitting issues were resolved with the regulatory agency.


Process performance and performance testing requirements for the high solids centrifuge dewatering and rotary drum thermal drying equipment. Additionally, full-scale results from the centrifuge and thermal dryer performance testing (including air emissions performance testing and site specific emissions factors) will be presented.


Discussion of operational performance and costs during the initial 1-1/2 year operations period of the dewatering and thermal drying equipment.
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Document Type: Research Article

Publication date: 2008-01-01

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