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International Journal of Environment Science and Technology
Center for Environment and Energy Research and Studies (CEERS)
ISSN: 1735-1472
EISSN: 1735-2630
Vol. 13, No. 1, 2016, pp. 263-274
Bioline Code: st16025
Full paper language: English
Document type: Research Article
Document available free of charge

International Journal of Environment Science and Technology, Vol. 13, No. 1, 2016, pp. 263-274

 en Gliding arc discharge-assisted biodegradation of crystal violet in solution with Aeromonas hydrophila check for this species in other resources strain
Njiki, A.; Kamgang-Youbi, G.; Laminsi, S.; Lontsi, C.D.; Payom, G.; Nola, M. & Ngameni, E.

Abstract

The gliding arc discharge, which is a source of nonthermal plasma, was used to enhance the biodegradation of crystal violet (CV), a triphenylmethane nonbiodegradable organic dye. The determination of the biodegradability index, i.e., biochemical oxygen demand (BOD5)/chemical oxygen demand (COD) ratio, and the total organic carbon measurement were used to assess the biodegradability. For the biological treatment alone, a bacterial strain of Aeromonas hydrophila check for this species in other resources (8 × 108 - CFU mL-1) bleached 42 % of CV solution (50 mg L-1) after 12-h incubation. The bleaching rate was enhanced by increasing the initial bacterial concentration; however, a drop in the bleaching rate was noted when CV concentration was increased. For the plasma process alone, a 15-min treatment resulted in a color removal of 49.7 %, at a mineralization rate of 12.2 %, thereby increasing the BOD5/COD ratio from 0.11 to 0.23. There was an increase in the bleaching rate in temporal post-discharge conditions (i.e., self-continuity of reaction after the discharge was switched off): For 2 h of temporal post-discharge reaction, the color removal of the 15-min plasma-pre-treated CV increased to 55 %. The disappearance of color during each treatment method followed the first-order kinetics. With regard to the combined plasma/biological treatment process, the 15-min plasma-pre-treated sample was bleached at 92 % by A. hydrophila after 2-h incubation and completely bleached for 6 h. Therefore, there is a positive synergism of bacterial and plasma treatments. This combined treatment is useful in reducing the energy involved in complete mineralization of wastewater containing nonbiodegradable dyes.

Keywords
Aeromonas hydrophila; Biodegradability enhancement; Bleaching; Coupling treatment system; Crystal violet; Glidarc plasma

 
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