Keywords: activated sludge, deep–shaft reactors, suspended growth system, hybrid bioreactors, wastewater treatment, carbon oxidation, performance evaluation, carbonaceous organic matter, automobile tyres, tyre tube beads, biocarriers, chemical oxygen demand, COD
Performance evaluation of a shaft–type hybrid bioreactor for the removal of carbonaceous organic matter
In comparison to an activated sludge process, the organics removal performance of a lab–scale hybrid bioreactor of volume 14.5 L was studied using waste automobile tyre–tube beads as bio–carrier. Batch study was performed using synthetic wastewater with soluble chemical oxygen demand (COD) ranging between 1000–3500 m/L for a period up to 9 h under purely suspended growth as well as hybrid condition with bio–carrier concentrations in the range of 10–30 g/L of reactor volume. Hybrid condition showed significant improvement in biomass settleability and organics removal with average COD removal efficiency of 89.6% as compared to 70.6% under purely suspended growth condition.