Abstract：
:Color removal from biologically pre-treated molasses wastewater by means of chemical oxidation with ozone has been investigated. Batch experiments have been performed in order to analyze the influence of ozone dosage and reaction time on color removal, molecular weight distribution and decolorization kinetics. Depending on the applied ozone dosage, color removal from 71% to 93% and COD reduction from 15% to 25% were reached after 30 min reaction time. TOC values remained constant throughout ozonation. Gel permeation chromatography corroborated that high molecular weight compounds, responsible for the brown color, were present in raw wastewater. UV spectral studies confirmed that these colored compounds were melanoidins. As a result of ozonation the concentration of chromophore groups decreased. Ozonation of synthetic melanoidin under the same experimental conditions provided similar color removal efficiencies. Pseudo-first order kinetics with respect to colored compounds were found.
journal_name
Chemospherejournal_title
Chemosphereauthors
Peña M,Coca M,González G,Rioja R,García MTdoi
10.1016/S0045-6535(03)00159-0subject
Has Abstractpub_date
2003-06-01 00:00:00pages
893-900issue
9eissn
0045-6535issn
1879-1298pii
S0045-6535(03)00159-0journal_volume
51pub_type
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