Combination of an electrochemical pretreatment with a biological oxidation for the mineralization of nonbiodegradable organic dyes: Basic yellow 28 dye. Issue 1 (28th March 2013)

• Record Type: Journal Article
• Authors: Yahiaoui, Idris; Aissani‐Benissad, Farida; Fourcade, Florence; Amrane, Abdeltif
• Is Part Of: Environmental progress & sustainable energy. Volume 33:Issue 1(2014:Apr.)
• Page Start: 160
• Page End: 169
• Publication Date: 2013-03-28
• Subjects: Environmental engineering -- Periodicals; Sustainable engineering -- Periodicals; Environmental chemistry -- Periodicals; 333.7
• DOI: 10.1002/ep.11774
• Languages: English
• ISSNs: 1944-7442

Abstract

<abstract abstract-type="main"> <title> <x xml:space="preserve">Abstract</x> </title> <p>The aim of this article was to examine the feasibility of combining an electrochemical degradation of wastewater containing Basic Yellow 28 (BY28) dye on Pb/PbO<sub>2</sub> electrode and a biological treatment. A central composite design (CCD) was used for the screening of the significant operating parameters and the identification of the most relevant interactions. The model equation obtained led to a classification of these parameters based on their level of significance, namely temperature followed by the initial concentration of BY28, the current density and the agitation speed. A significant interaction occurred between the temperature and the initial dye concentration. The second‐order model obtained by CCD led to the following optimal conditions for dye degradation: 50 ≤ <italic>T</italic> ≤ 60°C, 8.125 ≤ <italic>i</italic> ≤ 25 mA cm<sup>−2</sup>, [BY28]<sub>0</sub> = 134 mg L<sup>−1</sup>, and <italic>ω</italic> = 720 rpm. Under these conditions, the obtained BY28 dye degradation yield was 96%. The (BOD<sub>5</sub>/COD) ratio increased from 0.076 initially to 0.30 after pretreatment, showing that the electrochemical pretreatment of BY28 dye generate intermediate products, which are at least partially biodegradable.</p> <p>Microbial degradation was therefore performed for the pretreated solution in an aerobic batch reactor for 30 days using an activated sludge culture. A decrease of the residual amount of intermediate products contained in the electrolyzed solutions was observed which can be related to a biological oxidation, leading to 93% removal of the dissolved organic carbon by the combined process. © 2013 American Institute of Chemical Engineers Environ Prog, 33: 160–169, 2014</p> </abstract>