TREATMENT OF BREWERY WASTEWATER USING AN ADIABATIC FLUIDIZED BED BIOREACTOR

Authors: *Fadayini O, Aluyor E.O, Amenaghawon N.A, Akintola J.T

DOI Info: N/A

ABSTRACT

Adiabatic fluidized bed digester treatment methods are most suitable for the treatment of brewery wastewater streams as they offer more attractive operating and maintenance cost. This study is an investigation into the performance of an adiabatic fluidized bed bioreactor (AFBBR) system made of lagged insulating materials of cellulose. The digester was filled with activated carbon of particle size (70-300 ?m) and operated at a superficial velocity of 0.00112 m/s, minimum fluidized velocity of 0.00233 m/s, height of 0.025 m and with a voidage of 0.298. At the liquid volumetric flow rate of 0.017361 m³/s, the system was thermostatically controlled to operate at a temperature range of 35 ^oC- 42 ^oC. The wastewater treatment was conducted at different hydraulic retention times (HRT) of 1-5 hour. Results obtained revealed that chemical oxygen demand (COD) efficiencies reduced from 100% to 25.73% while the corresponding biological oxygen demand (BOD) reduced from 100% to 22.46% for a wastewater of initial concentration 2009.03 mg COD/L and 1719.2 mg BOD/L in 5 hours of HRT. Statistical analysis was carried out on the operation parameters using the Fisher’s test and P- value to check the model adequacy. In this system, adiabatic fluidized bed bioreactor (AFBBR) played the most vital role in fulfilling the triple R of reducing, recycling and reusing for effective waste management.

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