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Degradation of Organic Compounds in Wastewater Matrix by Electrochemically Generated Reactive Chlorine Species: Kinetics and Selectivity

Chung, Chong Min and Hong, Seok Won and Cho, Kangwoo and Hoffmann, Michael R. (2018) Degradation of Organic Compounds in Wastewater Matrix by Electrochemically Generated Reactive Chlorine Species: Kinetics and Selectivity. Catalysis Today, 313 . pp. 189-195. ISSN 0920-5861. http://resolver.caltech.edu/CaltechAUTHORS:20171031-140730625

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Abstract

In this study, we examined the kinetics and selectivity of chemical oxygen demand (COD) degradation by electrochemically generated reactive oxygen species (RCS) in variable wastewater matrix. According to measurements on reactive oxidants and linear sweep voltammetry, oxidation of organics either via reactive oxygen species or direct electron transfer played a minor role for the active IrO_2 anode. The RCS (mostly free chlorine in bulk solution) exclusively mediated an indirect oxidation with mean current efficiency from 25 to 40%. In batch galvanostatic experiments for single polymeric compounds, the rate of COD reduction showed marginal variations in spite of the large difference in reactivity with the RCS. Eight different wastewater samples prepared from greywater and urine for potentiostatic experiments. The kinetics of COD degradation in municipal wastewater was observed to more sluggish than in the urinary samples with initial elevations in [COD]. Fractionation of COD into proteins, carbohydrates, and carboxylates could explain the shift in kinetics, in terms of the reactivity with RCS and the ratio of COD to theoretical oxygen demand (ThOD) for each components. The anaerobic biodegradation of the organic matrix greatly improved the subsequent reactivity with RCS, which rationalizes a combination of electrochemical processes with biological pretreatment.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.1016/j.cattod.2017.10.027DOIArticle
http://www.sciencedirect.com/science/article/pii/S0920586117307241PublisherArticle
ORCID:
AuthorORCID
Hoffmann, Michael R.0000-0002-0432-6564
Additional Information:© 2017 Elsevier B.V. Available online 31 October 2017.
Subject Keywords:Wastewater; Chemical oxygen demand (COD); COD fractionation; IrO2 anode; Reactive chlorine species
Record Number:CaltechAUTHORS:20171031-140730625
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20171031-140730625
Official Citation:Chong Min Chung, Seok Won Hong, Kangwoo Cho, Michael R. Hoffmann, Degradation of organic compounds in wastewater matrix by electrochemically generated reactive chlorine species: Kinetics and selectivity, Catalysis Today, Volume 313, 2018, Pages 189-195, ISSN 0920-5861, https://doi.org/10.1016/j.cattod.2017.10.027. (http://www.sciencedirect.com/science/article/pii/S0920586117307241)
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:82813
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:31 Oct 2017 21:12
Last Modified:18 Jun 2018 21:24

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