Improving the Biodegradability of Non-Biodegradable Compounds Using Photo-Fenton Reaction

The feasibility of using the photo-Fenton reaction to improve the biodegradability of non-biodegradable compounds that originated from sewage was examined. Non-biodegradable compounds are degraded by hydroxyl (OH) radicals generated by the photo-Fenton reaction. During the degradation of non-biodegr...

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Bibliographic Details
Published in:Journal of Water and Environment Technology 2013, Vol.11(2), pp.121-130
Main Authors: TOKUMURA, Masahiro, HATAYAMA, Rurika, KAWASE, Yoshinori, YANAGISAWA, Yukio
Format: Article
Language:English
Subjects:
biodegradability
non-biodegradable compound
photo-Fenton reaction
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Summary:The feasibility of using the photo-Fenton reaction to improve the biodegradability of non-biodegradable compounds that originated from sewage was examined. Non-biodegradable compounds are degraded by hydroxyl (OH) radicals generated by the photo-Fenton reaction. During the degradation of non-biodegradable compounds, biodegradable intermediates such as organic acids are produced, resulting in improved biodegradability. The results of an experiment, in which a filtered supernatant solution of activated sludge from a sewage treatment plant was used, confirmed that the 5-day biochemical oxygen demand (BOD5) increased with decreasing total organic carbon (TOC) concentration as a result of the photo-Fenton reaction. This increased the ratio of BOD5 to TOC, which indicated that the biodegradability was improved. Although many non-biodegradable compounds have electron-dense structures, many biodegradable compounds have electron-lucent structures. Hydroxyl radicals, which are an oxidant in the photo-Fenton reaction, act as an electrophilic agent. In the degradation experiments using a mixture of biodegradable and non-biodegradable compounds, OH radicals preferentially attacked non-biodegradable compounds, and biodegradable compounds accumulated in the solution. As a result, the biodegradability was improved.
ISSN:1348-2165
1348-2165
DOI:10.2965/jwet.2013.121