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Journal of Environmental Science and Technology

Year: 2015 | Volume: 8 | Issue: 5 | Page No.: 238-243
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Authors

Ezerie Henry Ezechi

Shamsul Rahman Bin Mohamed Kutty

Mohamed Hasnain Isa

Amirhossein Malakahmad

Salihi Umar Ibrahim

Keywords

An integrated Bioreactor (IB) with three compartments (Aerobic, Anoxic and Clarifier) of total volume 180 L was successfully employed for the removal of Chemical Oxygen Demand (COD) from a simulated synthetic domestic wastewater at 25±2°C. Chemical Oxygen Demand (COD) (250-500 mg L–1) and hydraulic retention time (HRT 12 and 7.2 days) were varied. The bioreactor was inoculated with MLSS concentration of 3000 mg L–1. Results show that with initial COD concentration of 500 mg L–1, COD concentration decreased to 92-80 mg L–1 in the aerobic compartment and 81-71 mg L–1 in the anoxic compartment when HRT was raised from 7.2-12 days. COD concentration in the effluent was 74 and 44 mg L–1 at HRT of 7.2 and 12 days, respectively. Increased in organic loading did not show any significant effect in the aerobic compartment (83.4 and 84%) at 250 and 500 mg L–1 COD concentration, respectively. However, COD removal decreased in the anoxic compartment (90 and 86%) and the net effluent (95 and 91%) at 250 and 500 mg L–1 initial COD concentration. The substrate utilization rate was higher for the aerobic compartment (1.1919 day–1 m3 kg–1) but lower for the anoxic compartment (0.1725 day–1 m3 kg–1). Growth of microbial population was most significant in the aerobic compartment. Ammonia and nitrate was monitored and a removal of 94 and 83% was achieved respectively, at steady state. The obtained results demonstrate that an IB can be applied in the removal of medium strength COD from wastewater.
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