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Open AccessArticle

Experimental Investigation of Sludge Treatment Using a Rotor-Stator Type Hydrodynamic Cavitation Reactor and an Ultrasonic Bath

1
Department of Mechanical design Engineering, University of Hanyang, Seoul 04763, Korea
2
Key Laboratory of High Efficiency and Clean Mechanical Manufacture, Ministry of Education, National Demonstration Center for Experimental Mechanical Engineering Education at Shandong University, School of Mechanical Engineering, Shandong University, Jinan 250061, China
*
Author to whom correspondence should be addressed.
Processes 2019, 7(11), 790; https://doi.org/10.3390/pr7110790
Received: 25 September 2019 / Revised: 24 October 2019 / Accepted: 25 October 2019 / Published: 1 November 2019
In the present work, the sludge treatment performance of a sludge treatment using a rotor-stator type hydrodynamic cavitation reactor (HCR) was investigated. To verify the performance, a comparison with an ultrasonic bath was conducted in four experimental cases using three assessment factors. The HCR consisted of a rotor and three covers with inserted dimples resulting in variation of the cross-sectional area in a flow. The experimental cases were established using the same energy consumption for each device. Disintegration performance was analyzed with assessment factors using particle size distribution and sludge volume index (SVI), oxidation performance using total chemical oxygen demand (TCOD) and volatile suspended solids (VSS) reduction rate, as well as solubilization rate using soluble chemical oxygen demand (SCOD). As a result, the particle disintegration and oxidation performance of the HCR were generally superior to those of the ultrasonic bath. However, due to the contradictory interactions of these factors, the solubilization rate of the two devices was measured similarly as 42.3% and 41.4% for each device. Results of the current study proved that the HCR can be an effective, promising and clean sludge treatment technique for use in wastewater treatment plants. View Full-Text
Keywords: rotor-stator type hydrodynamic cavitation reactor; ultrasonication; sludge treatment; performance comparison rotor-stator type hydrodynamic cavitation reactor; ultrasonication; sludge treatment; performance comparison
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MDPI and ACS Style

Kim, H.; Sun, X.; Koo, B.; Yoon, J.Y. Experimental Investigation of Sludge Treatment Using a Rotor-Stator Type Hydrodynamic Cavitation Reactor and an Ultrasonic Bath. Processes 2019, 7, 790.

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