| Pilot treatment of olive pomace leachate by vertical-flow constructed wetland and electrochemical oxidation: an efficient hybrid process. | |
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MedLine Citation:
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PMID: 20199791 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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A 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. |
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Authors:
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Petros Grafias; Nikolaos P Xekoukoulotakis; Dionissios Mantzavinos; Evan Diamadopoulos |
Publication Detail:
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Type: Journal Article Date: 2010-02-16 |
Journal Detail:
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Title: Water research Volume: 44 ISSN: 1879-2448 ISO Abbreviation: Water Res. Publication Date: 2010 May |
Date Detail:
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Created Date: 2010-04-26 Completed Date: 2010-08-13 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 0105072 Medline TA: Water Res Country: England |
Other Details:
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Languages: eng Pagination: 2773-80 Citation Subset: IM |
Copyright Information:
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Copyright (c) 2010 Elsevier Ltd. All rights reserved. |
Affiliation:
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Department of Environmental Engineering, Technical University of Crete, Chania, Greece. |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Biodegradation, Environmental Color Electrochemical Techniques* Industrial Waste / prevention & control Olea* Oxidation-Reduction Pilot Projects Poaceae Toxicity Tests Water Pollutants, Chemical / chemistry* Wetlands* |
| Chemical | |
Reg. No./Substance:
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0/Industrial Waste; 0/Water Pollutants, Chemical |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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