Treatment of an effluent containing 50 mg/L of both abietic acid (AA) and d
ehydroabietic acid (DHA) by 1-L upflow anaerobic sludge bed (UASB) and coup
led anaerobic/aerobic system (CANOXIS) was comparatively studied for eight
weeks. The CANOXIS reactors released three times less AA and DHA concentrat
ions in their effluents than the UASB reactors. Furthermore, adsorption on
UASB biomass was more significant than on CANOXIS biomass, with 15.8 compar
ed to 4.1 mg AA/gVSS and 36.8 compared to 10.3 mg DHA/gVSS.