International Journal of Environmental Sciences

Volume 5 Issue 3 2014- November 2014    Pages: 880- 890  <<Previous    Next>>

Heavy metal recovery by native macrophytes from Subarnarekha river-India

Author Information:

Madhu G M, Ashly Thomas, Deepak S, Preetham H S, Rajanandam K S
Department of Chemical Engineering, M.S. Ramaiah Institute of Technology, Bangalore, India

ABSTRACT

The degradation of malachite green and methyl violet solution was studied using hydrodynamic cavitation. Effect of inlet pressure, oxidizing agent, geometry of the orifice, cavitation number and pH were studied with the aim of maximizing degradation. Studies were done individually and in combination with H2O2. It was found that there was an obvious synergetic effect of H2O2 and hydrodynamic cavitation in the degradation of dyes. With the increase in pressure the degradation was found to be increased and with decrease in orifice diameter and cavitation number the degradation was found to be increased. It was observed that maximum of 98.42% and 62.48% of malachite green and methyl violet solution degraded without oxidant at 5 kg/cm2 using 2 mm orifice. 2 mm orifice was found to give maximum degradation. Degradation increased with increase in pH and temperature. At pH 11, 100% degradation of green solution was observed at the end of 40 minutes and 95.22% degradation of violet dye solution at end of 60 minutes was found, when operated at 5 kg/cm2 pressure using 2 mm orifice.

Keywords: Hydrodynamic cavitation, Malachite green, Methyl violet, Orifice Geometry, Cavitation number

DOI:10.6088/ijes.2014050100081

© 2014 Copyright by the authors, licensee Integrated Publishing Association.This is an open access article distributed under the Creative Commons Attribution License (3.0) which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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