• Muhammad Noor Hazwan Jusoh Department of Environmental Engineering, Faculty of Civil Engineering, UTM, 81310, Johor Bahru, Johor, Malaysia
  • Azmi Aris Department of Environmental Engineering, Faculty of Civil Engineering, UTM, 81310, Johor Bahru, Johor, Malaysia
  • Juhaizah Talib Centre for Environmental Sustainability and Water Security (IPASA), Research Institute for Sustainable Environment, UTM, 81310, Johor Bahru, Johor, Malaysia




Hydroxyl radical, hydrodynamic cavitation, dual orifice plates, single orifice plate, advanced oxidation processes, iodide dosimeter


The generation of hydroxyl radicals (OHŸ) by hydrodynamic cavitation (HC) using single and double orifice plates was studied. Five orifice plates with different configurations (size and number of orifice, total orifice area) were tested. The formation of OHŸ was measured by iodide dosimeter method using spectrophotometer at 355 nm wavelength. The effects of plate configurations and double plate arrangements on OHŸ generation were investigated in 60 minutes of reaction time using an inlet pressure of 45 psi and initial potassium iodide (KI) concentration of 20 g/L. The generation of OHŸ were expressed in terms of concentration and percentage of increase of iodine liberation. The liberated iodine for single plate ranged from 0.26 to 0.56 g/L (84 to 180% increase). The highest liberation was achieved using plate with the lowest total flow area of orifice, which had the smallest cavitation number. The double plate arrangement produced the highest iodine liberation (1.30 g/L; 420% increase) with the highest cavitational yield (2.9 x 10-1 mg/J) as compared to those of single plate arrangement. In double plate arrangement, the enhancement was dependent on the configuration and arrangement of the plates.


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Science and Engineering

How to Cite

HYDRODYNAMIC CAVITATION USING DOUBLE ORIFICE- PLATES FOR THE GENERATION OF HYDROXYL RADICALS. (2016). Jurnal Teknologi, 78(11). https://doi.org/10.11113/jt.v78.7164