Borja, R., Banks, C. J. and Wang, Z.
Performance of a hybrid anaerobic reactor, combining a sludge blanket and a filter, treating slaughterhouse wastewater
Applied Microbiology and Biotechnology, 43, (2), . (doi:10.1007/BF00172838).
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A column reactor, in which the bottom two-thirds were occupied by a sludge blanket and the upper one-third by submerged clay rings, was evaluated using slaughterhouse wastewater as substrate. The reactor was operated at 35°C at loading rates varying from 5 g to 45 g chemical oxygen demand (COD) 1–1 × day–1 at an influent concentration of 2450 mg COD 1–1. A maximum substrate removal rate of 32 g COD 1–1 × day–1, coupled with a methane production rate of 6.91 × 1–1 × day–1 (STP), was obtained. This removal rate is significantly higher than those previously reported. The rate of substrate utilization by the biomass was 1.22 g COD (g volatile suspended solids)–1 day–1. COD removal was over 96% with loading rates up to 25 g COD 1–1 × day–1, at higher loading rates performance decreased rapidly. It was found that the filter element of the reactor was highly efficient in retaining biomass, leading to a biomass accumulation yield coefficient of 0.029 g volatile suspended solids g–1 COD, higher than reported previously for either upflow anaerobic sludge-blanket reactors or anaerobic filters operating independently
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