Abstract
Wastewater generated during gasification of biomass contains phenolics, nitrogen heterocyclics and polynuclear aromatic hydrocarbons (PAHs). In this work a sessile freshwater algal consortium and Exiguobacterium aurantiacum (3:1 v/v) was used for forming biofilm in a three stage 16-L RBC for treatment of gasifier wastewater having initial COD of 1381±50 mg/L. Biofilm formation was achieved through gradual acclimatization to gasifier wastewater before conducting flow-through studies at 36 h hydraulic retention time (HRT). COD removal in the first, second and third stage were 65±5%, 76±5% and 83±5%, respectively at pseudo steady state. Microalgae in the biofilm were predominantly comprised of green algae.
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