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Pilot treatment of olive pomace leachate by vertical-flow constructed wetland and electrochemical oxidation: An efficient hybrid process

Xekoukoulotakis Nikos, Mantzavinos Dionysis, Diamantopoulos Evaggelos, Grafias Petros

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URIhttp://purl.tuc.gr/dl/dias/6D041479-3DB8-4522-B83D-28CA17996457-
Identifierhttps://doi.org/10.1016/j.watres.2010.02.015-
Identifierhttp://www.sciencedirect.com/science/article/pii/S0043135410001296-
Languageen-
Extent8 pagesen
TitlePilot treatment of olive pomace leachate by vertical-flow constructed wetland and electrochemical oxidation: An efficient hybrid processen
CreatorXekoukoulotakis Nikosen
CreatorΞεκουκουλωτακης Νικοςel
CreatorMantzavinos Dionysisen
CreatorΜαντζαβινος Διονυσηςel
CreatorDiamantopoulos Evaggelosen
CreatorΔιαμαντοπουλος Ευαγγελοςel
CreatorGrafias Petros en
PublisherElsevieren
Content SummaryA hybrid process comprising biological degradation in a vertical-flow constructed wetland (CW) and electrochemical oxidation over boron-doped diamond electrodes to decolorize, mineralize and detoxify a leachate from olive pomace processing (OPL) was investigated. Two alternative treatment schemes were compared: According to the first treatment scheme, OPL was treated by electrochemical oxidation followed by treatment in a constructed wetland pilot unit (CW-A). The second scheme comprised of treatment in a constructed wetland followed by electrochemical treatment (CW-B). The constructed wetlands units were planted with Phragmites australis (reeds) and were fed intermittently at organic loadings between 5 and 15 g COD m−2 d−1 and a residence time of 3 d. Electrochemical oxidation (EO) was performed for 360 min at 20 A. Treatment of OPL in the wetland at 15 g COD m−2 d−1 led to mean COD and color reduction of 86% and 77%, respectively; the wetland effluent with a COD of about 800 mg L−1 was polished electrochemically for 360 min after which the overall COD and color removal of the combined process (i.e. CW-B/EO) was around 95%, while the final effluent was not toxic against the marine bacteria Vibrio fischeri. Electrochemical oxidation of the original OPL at COD values between 6250 and 14 100 mg L−1 led to moderate COD and color reduction (i.e. less than 40%) through zero order kinetics. When this was coupled to constructed wetland post-treatment (i.e. EO/CW-A), the overall COD and color removal was 81% and 58%, respectively. The decreased efficiency may be assigned to the increased toxicity of the electrochemically treated effluent which was only partially removed in the natural treatment system.en
Type of ItemPeer-Reviewed Journal Publicationen
Type of ItemΔημοσίευση σε Περιοδικό με Κριτέςel
Licensehttp://creativecommons.org/licenses/by/4.0/en
Date of Item2015-10-22-
Date of Publication2010-
SubjectConstructed wetlanden
SubjectBoron-doped diamonden
SubjectElectrolysisen
SubjectPomace leachateen
SubjectProcess integrationen
SubjectTreatmenten
Bibliographic CitationP. Grafias, N. P. Xekoukoulotakis, D. Mantzavinos and E. Diamadopoulos," Pilot treatment of olive pomace leachate by vertical-flow constructed wetland and electrochemical oxidation: An efficient hybrid process," Water Res., vol. 44, no. 9, pp. 2773-2780, May 2010. .doi.org/10.1016/j.watres.2010.02.015.en

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