US EPA

1685769 

Journal Article 

DENITRIFICATION IN A MOVING BED UPFLOW SAND FILTER 

Koopman, B; Stevens, CM; Wonderlick, CA 

1990 

1 

Research Journal of the Water Pollution Control Federation
ISSN: 1047-7624 

62 

3 

239-245 

WOS:A1990HC76300005 

The denitrification performance of a moving bed upflow sand filter with methanol added as a carbon source was evaluated. Hydraulic loading rates were varied between 3.4 and 11.0 m/d and influent NO2 + NO3-N concentrations of up to 22 g/m3 were tested. The turnover rate of the sand bed ranged between 0.4 and 3.8 bed volumes/d. It was found that complete denitrification (effluent NO2 + NO3-N less-than-or-equal-to 1.0 g/m3) was obtained at daily loadings of up to 2.7 kg/m3 total equivalent nitrate nitrogen (NO3-N(eq)). The minimum methanol dosage required for complete denitrification was in the range of 3.3 to 3.5 g CH3OH/g NO3-N(eq)). Methanol leakage, as evidenced by an increase of BOD5 across the filter, was negligible at dosages of 3.5 g/g NO3-N(eq) or less. 

BIOCHEMICAL OXYGEN DEMAND; DENITRIFICATION; METHANOL; NITRATE; NITRITE; NUTRIENT REMOVAL; SAND FILTRATION; WASTE-WATER