A drainage/filtration apparatus was developed for automatically determining sedimentation
velocity and dewatering rate. Pressure-step testing was used to study filter cake
compressibility, resistance, and swelling. Activated sludge was analysed, and the data
indicate that the sludge is highly compressible even at low pressures (10 kPa). Furthermore,
compressed sludge cakes swell if the pressure is released. Hence, the average specific cake
resistance decreases if the pressure is released, though the resistance is higher after the
compression cycle than before. Sludge must be dewatered under low pressure, because
higher pressure only compresses the cake and does not improve the dewatering rate.
A drainage/filtration apparatus was developed for automatically determining sedimentationvelocity and dewatering rate. Pressure-step testing was used to study filter cakecompressibility, resistance, and swelling. Activated sludge was analysed, and the dataindicate that the sludge is highly compressible even at low pressures (10 kPa). Furthermore,compressed sludge cakes swell if the pressure is released. Hence, the average specific cakeresistance decreases if the pressure is released, though the resistance is higher after thecompression cycle than before. Sludge must be dewatered under low pressure, becausehigher pressure only compresses the cake and does not improve the dewatering rate.
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