This paper deals with a two-year pilot scale experimental trial for the mesophilic (35°C), thermophilic (55°C) and temperature phased (70°C+55°C) anaerobic digestion of waste activated sludge at high rate (total solids 6% in the feed). The reactor operated at an organic loading rate of some 2,2 kgVS/m 3d and a hydraulic retention time of 20 days in the three different temperatures tested. The general conclusion of this study is that a two phase processes with a first hydrolytic phase at 70°C can be a convenient solution to improve the stabilisation capability of anaerobic digestion of waste activated sludge and can be easily implemented for the upgrade of full scale wastewater treatment plants.
Mesophilic, thermophilic and temperature phased anaerobic digestion of waste activated sludge
BOLZONELLA, David;FATONE, Francesco;DI FABIO, Silvia;CECCHI, Franco
2009-01-01
Abstract
This paper deals with a two-year pilot scale experimental trial for the mesophilic (35°C), thermophilic (55°C) and temperature phased (70°C+55°C) anaerobic digestion of waste activated sludge at high rate (total solids 6% in the feed). The reactor operated at an organic loading rate of some 2,2 kgVS/m 3d and a hydraulic retention time of 20 days in the three different temperatures tested. The general conclusion of this study is that a two phase processes with a first hydrolytic phase at 70°C can be a convenient solution to improve the stabilisation capability of anaerobic digestion of waste activated sludge and can be easily implemented for the upgrade of full scale wastewater treatment plants.
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