| View Larger Image | Phytoremediation of textile effluents containing azo dye by using Phragmites australis in a vertical flow intermittent feeding constructed wetland [An article from: Ecological Engineering] | Digitalby L.C. Davies (Author), C.C. Carias (Author), J.M. Novais (Author), Martins-Dia (Author)
| List Price: | $8.95 | | | Available: | Available for download now |
| | Binding: | Digital | | Publisher: | Elsevier |
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This digital document is a journal article from Ecological Engineering, published by Elsevier in . The article is delivered in HTML format and is available in your Amazon.com Media Library immediately after purchase. You can view it with any web browser.Description: An azo dye, acid orange 7 (AO7), was selected to study the role of Phragmites australis (P. australis) peroxidases (POD) activity in its degradation in a vertical flow constructed wetland (VFCW). Crude plant extract was found to degrade AO7 and its aromatic amines, after 120h in contact with H"2O"2, and removals of 3.2-5.7mg"A"O"7g"P"."a"u"s"t"r"a"l"i"s^-^1 were obtained for 40mg"A"O"7l^-^1 (8mg"A"O"7g"P"."a"u"s"t"r"a"l"i"s^-^1). The VFCW was found to be suitable to treat an effluent containing an azo dye. For influent concentrations of 130mg"A"O"7l^-^1 POD activity increased 2.1-, 4.3- and 12.9-fold for leaves, stems and roots, respectively. At 700mg"A"O"7l^-^1, inhibition of POD activity occurred immediately, but it returned to the previous levels after only 2 days. An AO7 organic load of 21 up to 105gCODm^2day^-^1, revealed non-toxicity, being expectable to achieve removals of 11 up to 67gCODm^2day^-^1. Both [AO7] and TOC removal efficiencies were found to be similar (approximately 70%), which is indicative of AO7 mineralization. A 3h cycle was found to be sufficient to degrade AO7 and a system buffering capacity from 5 to 25mincycle^-^1 was demonstrated by flooding level control. |
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