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Anaerobic digestion of brewery effluent: two-year operating experiences
conference contributionposted on 29.09.2017, 10:09 by Tanja RaduTanja Radu, Richard BlanchardRichard Blanchard, Vincent Smedley, Helen Theaker, Andrew D. Wheatley
In this paper we discuss two years operational experiences of an AD wastewater treatment plant to treat brewery waste. The plant uses a 900 m3 expanded granular sludge blanket (EGSB) bioreactor, at 35oC. The variation in effluent composition was balanced in a buffer tank and the EGSB reactor included recycle to provide further buffering. The average waste flow was 250 m3/day which corresponded to a daily load of 6000 kg COD/day. The digester’s performance was assessed based on COD, suspended solids, Ripley’s ratio, volatile fatty acids, and biogas production. The initial COD concentration in effluent of 15000 mg/l was reduced to 120 mg/l in waste sent to sewer, resulting in about 99.2% COD reduction. Suspended solids concentrations were reduced from 2400 mg/l in the effluent to 55 mg/l being released to sewer. The plant has recovered the initial capital expenditure in five years. The wastewater effluent has a high treatability with 86% COD present as soluble COD. This results in a quality of gas which exceeded the expected methane to CO2 ratio of 60% to 40%. An average of 80 m3 of biogas is produced every hour, but the variance in gas flow remains an issue.
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