Abstract
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.
Highlights
Environmental pollution has become a serious global problem due to continuous industrialization.Especially, water pollution is a major issue, and regulations for waste-water disposal are being reinforced globally
The particle size of the sludge is closely related to anaerobic digestion performance and dewaterability
To evaluate the waste activated sludge (WAS) treatment performance of the rotor-stator type hydrodynamic cavitation reactor (HCR), the performance was compared conducted with an ultrasonic bath using three assessment factors
Summary
Environmental pollution has become a serious global problem due to continuous industrialization.Especially, water pollution is a major issue, and regulations for waste-water disposal are being reinforced globally. In industrial and municipal waste-water treatment plants (WWTPs), the activated sludge treatment method is the most used biological process. This method produces a high amount of excess sludge consuming 18%–57% of total operational cost of WWTPs. To reduce the amount of excess sludge, various techniques have been used to treat waste-water for decades. Traditional methods generally involve a high processing cost, long treatment time, low treatment capability, or generation of chemical by-products [5]. To overcome these drawbacks, new methods have been proposed in the literature [6,7,8,9]. Cavitation has shown a remarkable development potential for large scale applications
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