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Scale-Up of Sonochemical Reactors for Water Treatment

Destaillats, Hugo and Lesko, Timothy M. and Knowlton, Michael and Wallace, Henry and Hoffmann, Michael R. (2001) Scale-Up of Sonochemical Reactors for Water Treatment. Industrial & Engineering Chemistry Research, 40 (18). pp. 3855-3860. ISSN 0888-5885. https://resolver.caltech.edu/CaltechAUTHORS:20150807-092336596

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Abstract

A novel pilot-plant scale sonochemical reactor (UES 4000 C Pilotstation) has been specifically developed for degrading a variety of water contaminants in large-scale applications. We report here the sonochemical degradation of three chemical compounds in aqueous solution:  the chlorinated volatile contaminants dichloromethane (DCM) and trichloroethylene (TCE) and the nonvolatile azo dye methyl orange (MO). The flow-through reactor in the Pilotstation consists of four 612 kHz piezoelectric transducers which are driven by a power source operating at 3kW. The sonochemical reaction chamber has a volume of 6 L, while the total capacity of the Pilotstation, including a heat-exchanger unit and a reservoir tank varies from a minimum volume of 7.25 L to a maximum over 45 L. The observed reaction rates for the degradation of these contaminants in the Pilotstation were compared with values determined under similar conditions in small-scale bench reactors in order to evaluate its performance over a wide range of power densities. The pseudo-first-order degradation rate for TCE in the Pilotstation was found to be more than 4 times higher than corresponding smaller values measured in lab-scale reactors. Furthermore, the observed rates for DCM degradation also exceeded those of the small-scale reactors by factors from 3 to 7. The degradation rate of these two chlorinated compounds was faster with decreasing initial concentration in all cases. Experiments with 10 μM MO (aq) in the Pilotstation operating at different total volumes exhibited a linear dependence between the observed rate constants for sonolysis and the applied power density (PD), in the range 67 < PD (W/L) < 414. Steady-state •OH (aq) radical concentrations in each reactor were calculated and were shown to correlate with the applied power density in the vessel. A power budget analysis for the Pilotstation indicates that nearly one-third of the applied power is converted in sonochemical activity.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1021/ie010110uDOIArticle
http://pubs.acs.org/doi/abs/10.1021/ie010110uPublisherArticle
ORCID:
AuthorORCID
Hoffmann, Michael R.0000-0002-0432-6564
Additional Information:© 2001 American Chemical Society. Received for review February 5, 2001. Accepted June 21, 2001. Publication Date (Web): August 4, 2001. The authors thank Thomas W. Alderson II for his collaboration during the initial steps of this work. Financial support provided by the Department of Energy (DOE 1963472402) and the U.S. Navy (N 47408-99-M-5049) is gratefully acknowledged.
Funders:
Funding AgencyGrant Number
Department of Energy (DOE)DOE 1963472402
Office of Naval Research (ONR)N 47408-99-M-5049
Issue or Number:18
Record Number:CaltechAUTHORS:20150807-092336596
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20150807-092336596
Official Citation:Scale-Up of Sonochemical Reactors for Water Treatment Hugo Destaillats, Timothy M. Lesko, Michael Knowlton, Henry Wallace, and Michael R. Hoffmann Industrial & Engineering Chemistry Research 2001 40 (18), 3855-3860 DOI: 10.1021/ie010110u
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:59308
Collection:CaltechAUTHORS
Deposited By: Ruth Sustaita
Deposited On:07 Aug 2015 18:35
Last Modified:03 Oct 2019 08:45

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