MBBR AND IFAS PILOT PROGRAM FOR DENITRIFICATION AT FAIRFAX COUNTY’S NOMAN COLE POLLUTION CONTROL PLANT

Proceedings

MBBR AND IFAS PILOT PROGRAM FOR DENITRIFICATION AT FAIRFAX COUNTY’S NOMAN COLE POLLUTION CONTROL PLANT

Sarah Motsch1, Dan Fetherolf1, George Guhse², John McGettigan³, and Tom Wilson³

1Fairfax County, Noman M. Cole Pollution Control Plant, USA
²Greeley and Hansen, USA
³Earth Tech, USA
(free)

As part of a nutrient reduction program, developed to meet new Virginia ENR requirements, two innovative denitrification technologies were piloted at the Noman Cole Jr. Water Pollution Control Plant in Fairfax County, Virginia. The first technology was a Moving Bed Biofilm
Reactor (MBBR). The second technology was a modified Integrated Fixed Film Activated Sludge (IFAS) process. These studies have shown that both technologies can be used for denitrification at the plant. Each was shown to be easily capable of reducing the pilot influent
NOx-N of 7 mg/L to below 2 mg/L NOx-N at the loadings studied. The MBBR system was shown to be sensitive to influent orthophosphate levels below 1.0 mg//l. Only about 1.25 g of excess TSS was produced per g of NOx-N removed, in the MBBR system.

KEY WORDS
Denitrification, MBBR, Limit of Technology (LOT), IFAS, ENR

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