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County Engineering
Glen Whisler, P.E., County Engineer
120 East Parrish Street
Law Building, 1st Floor
Durham, NC 27701
Phone: 919-560-0735
FAX: 919-560-0740
Hours: 8:30 AM-5:00 PM
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TWWTP Improvements

Capital Improvements completed from 2002 through 2005 included: a new 48” outfall leading to the relocated influent pump station with fine screening, grit removal, electrical buildings, emergency generators, chemical building, and odor control. New flow testing and measurement equipment was installed, as well as a temporary effluent pump station, ultraviolet disinfection, post aeration, and discharge piping, and a new Biological Nutrient Removal (BNR) treatment process to meet the more restrictive permit limits mainly for Nitrogen and Phosphorus removal. A new state-of –the-art administration building was built on-site to house operations, laboratory, and maintenance personnel and equipment. This building is LEED certified and has won awards for design and environmental excellence.

 

Facilities to produce Class A biosolids are in the design phase and will include: sludge handling, treatment, and a temporary storage facility for this material. Class A biosolids indicates a highly treated product as described by the US Environmental Protection Agency (EPA). A major benefit of this facility will be the ability to take the existing 5-acre lagoon out of service that currently holds biosolids until removed and disposed of.

TWWTP Capital Improvements

Facilities to produce highly treated wastewater (reclaimed water) suitable for irrigation and cooling towers are also in the design phase. The temporary effluent pump station constructed in Phase 1 will be upgraded to allow it to distribute reclaimed water to the area. This facility will reduce the amount of effluent to area streams and save potable water.

 

These projects were approved by the County Commissioners to improve the treatment capabilities of the TWWTP and provide continued capacity to County customers for a projected 20 years. One of the main attributes of the project was to raise the plant above the 100 year flood elevation. This improves the environmental impact the plant could have on area streams during heavy storms and allows the plant to effectively treat and discharge wastewater during flood events.


Last updated: April 14, 2008
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