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Phytoremediation of textile effluents containing azo dye by using Phragmites australis in a vertical flow intermittent feeding constructed wetland by L.C. Davies; C.C. Carias; J.M. Novais; S. Martins-Dias is a Environmental Science article available to read on EtoBox.

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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 120 h in contact with H 2 O 2 , and removals of 3.2-5.7 mg AO7 g -1 P. australis were obtained for 40 mg AO7 l -1 (8 mg AO7 g -1 P. australis ). The VFCW was found to be suitable to treat an effluent containing an azo dye. For influent concentrations of 130 mg AO7 l -1 POD activity increased 2.1-, 4.3-and 12.9-fold for leaves, stems and roots, respectively. At 700 mg AO7 l -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 105 g COD m 2 day -1 , revealed non-toxicity, being expectable to achieve removals of 11 up to 67 g COD m 2 day -1 . Both [AO7] and TOC removal efficiencies were found to be similar (approximately 70%), which is indicative of AO7 mineralization. A 3 h cycle was found to be sufficient to degrade AO7 and a system buffering capacity from 5 to 25 min cycle -1 was demonstrated by flooding level control.

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Author

L.C. Davies; C.C. Carias; J.M. Novais; S. Martins-Dias

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0925-8574)

Published

2005

Language

EN

Field

Environmental Science (Physical Sciences)