The effect of operational parameters on electrocoagulation-flotation process followed by photocatalysis applied to the decontamination of water effluents from cellulose and paper factories

Journal of Hazardous Materials
Marcela BoroskiNoboru Hioka

Abstract

Cellulose and paper pulp factories utilize a large amount of water generating several undesirable contaminants. The present work is a preliminary investigation that associates the electrocoagulation-flotation (EC) method followed by photocatalysis to treat such wastewater. For EC, the experiment with aluminium and iron electrodes showed similar efficiency. Iron electrodes (anode and cathode) were chosen. By applying 30min of EC/Fe(0), 153A m(-2) and pH 6.0, the COD values, UV-vis absorbance and turbidity underwent an intense decrease. For the subsequent UV photocatalysis (mercury lamps) TiO(2) was employed and the favourable operational conditions found were 0.25g L(-1) of the catalyst and solution pH 3.0. The addition of hydrogen peroxide (50mmol L(-1)) highly increased the photo-process performance. By employing the UV/TiO(2)/H(2)O(2) system, the COD reduction was 88% compared to pre-treated effluents and complete sample photobleaching was verified. The salt concentration on EC (iron electrodes) showed that the electrolysis duration can be reduced from 30 to 10min by the addition of 5.0g L(-1) of NaCl. The biodegradability index (BOD/COD) increased from 0.15 (pre-treated) to 0.48 (after EC) and to 0.89 (after EC/photocatalysi...Continue Reading

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Citations

May 29, 2012·Environmental Monitoring and Assessment·Juliana Carla GarciaNilson Evelázio de Souza
Jul 24, 2010·Ecotoxicology and Environmental Safety·Christelle CaplatGiovanni Pagano
Jul 14, 2010·Journal of Hazardous Materials·Eduardo TerrazasIsrael Rodríguez
Dec 24, 2010·Journal of Hazardous Materials·R GherbiM Trari
Jun 24, 2014·Ecotoxicology and Environmental Safety·Mohammadreza Kamali, Zahra Khodaparast
Sep 5, 2014·Environmental Science and Pollution Research International·Daphne HermosillaÁngeles Blanco
Nov 1, 2013·Anais Da Academia Brasileira De Ciências·Diogo S PellosiNoboru Hioka

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