Performance of Anaerobic Digester-Constructed Wetlands System for Brewery Wastewater Treatment

Adedayo A. Badejo, Julius M. Ndambuki, Williams K. Kupolati, and Soliu A. Amuda


Industrial Wastewater, Constructed Wetland, Anaerobic Digester, Brewery Wastewater


The study examined the performance of an engineered system designed and constructed with anaerobic digester in treating brewery effluent. The pilot treatment system consisted of two 0.25 m3 digesters and four Constructed Wetlands (CW) with each pair of CW connected in series. The CW consists of 1200 × 1000 × 1000 mm plastic tanks, filled with 500 mm deep, 10-15 mm size granite overlaid with 150 mm thick sand (Cu = 1.15 and Cc = 6.8) substrate. The pilot CW was planted with Phragmites Karka Retz. at 200 mm centres. Effluent collected from the brewery was analysed for physico-chemical parameters using standard procedures. Performance evaluation was carried out at 2, 5, 7 and 10 days retention periods in both the digester and CW. Results showed that the brewery effluent is characterised by high organic content with a Biochemical Oxygen Demand (BOD5) of 1630 mg/l, which was reduced by 95.82% in the Anaerobic Digester-CW System combination, with about 60% of the BOD5 reduction occurring in the Anaerobic Digester. The nitrate, phosphate and TSS were reduced by 80.96, 82.73 and 96.31% respectively in the CW. The study showed that Anaerobic Digester-CW combination has a high potential in brewery wastewater treatment.

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