Abstract
The impact of high flow rates and increased viscosity of digested sewage sludge (DS) on the cavitation intensity in ultrasonic tube reactors was determined by use of a hydrophone. The results indicate a reduction of cavitation intensity in DS by 11% at an average flow velocity of 0.4 m/s compared to batch sonication. Slightly increased flow velocities in the range of 0.8–1.3 m/s resulted in an increase in cavitation intensity in DS of up to 9%. Further acceleration of the flow leads to a substantial reduction of cavitation noise level both in DS and in water of up to 49%. The results provide valuable insights for the design of sonication systems in wastewater treatment plants. It can be concluded that the sonication system must be designed in such a way that the sludge is in motion during sonication, but the flow velocity does not exceed the limit of laminar flow.
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