Biological oxidation of high strength nitrogenous wastewater
Abstract
A nitrification study was conducted in continuous flow stirred tank reactors using high strength nitrogenous wastewater (concentrated stream from a urea plant mixed with pharmaceutical wastewater). The reactors were operated at different solids retention times (SRT = 10-62.5 d) and hydraulic retention times (HRT = 1.5-2.1 d). Pharmaceutical wastewater was used as an organic carbon source to maintain a COD/TKN ratio of 1. The nitrification achieved at different SRTs varied from 87 to 99%. The nitrogen balance data show that ammonia assimilation and denitrification accounted for 4-53% of the total nitrogen removed. The yield coefficients and decay coefficients were Y b = 0.5 (COD basis), k db = 0.07 d -1 (COD basis) for heterotrophs and Y n = 0.15 (TKN basis), k dn = 0.06 d -1 (TKN basis) for nitrifiers respectively.
- Publication:
-
Water Research
- Pub Date:
- 1996
- DOI:
- 10.1016/0043-1354(95)00172-7
- Bibcode:
- 1996WatRe..30..593G
- Keywords:
-
- nitrification;
- wastewater treatment;
- activated sludge process;
- ammonia removal