Performance of laboratory anaerobic hybrid reactors with varying depths of media

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Abstract
A parallel study of laboratory scale anhybrid reactors with total media volume/total reactor volume ratios of 0.50, 0.40, 0.25 and 0.05 was carried out under unsteady state start‐up conditions. All reactors incorporated an identical sludge bed zone volume and were initially seeded with the same amount of digester sludge. They were operated with an average flowrate of 6 L d∼^ with periodic increases in influent concentration. After 111 days, the reactors with the smallest media/total volume ratios failed. Greater media/total volume ratios were found to be more effective in promoting the retention of biomass in the sludge bed zone.

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