Water Supply Vol 4 No 5-6 pp 65–72 © IWA Publishing 2005
Comparison between biological and chemical-physical treatment for colour removal
G. Farabegoli*, L. Pietrelli**, E. Rolle*** and A. Sabene****
*Department of Hydraulics, Transportation and Roads, University of Rome "La Sapienza", via Eudossiana 18, 00184 Rome, Italy (E-mail: geneve.farabegoli@polimi.it; enrico.rolle@uniroma1.it)
**ENEA Via Anguillarese 301, 00100 Rome, Italy (E-mail: pietrelli@casaccia.enea.it; adriano.sabene@tin.it)
***Department of Hydraulics, Transportation and Roads, University of Rome "La Sapienza", via Eudossiana 18, 00184 Rome, Italy (E-mail: geneve.farabegoli@polimi.it; enrico.rolle@uniroma1.it)
****ENEA Via Anguillarese 301, 00100 Rome, Italy (E-mail: pietrelli@casaccia.enea.it; adriano.sabene@tin.it)
ABSTRACT
The main aim of this research is to compare the efficiency of biological and chemical-physical treatments for the removal of organic azo dyes in the textile wastewater. Regarding the biological reduction of the wastewater colour the anaerobic/aerobic (ANA/AER) sequential step-treatment provides the best reductions in colour and COD. A lab-scale Sequencing Batch Reactor (SBR) fed with synthetic wastewater and mono-azo dye (at the initial concentration of 25 mg/l) was used achieving 84% colour reduction and 82% COD removal. Chemical-physical treatments were performed using the oxidative method with Fenton's reagent and adsorption on the activated carbon achieving respectively colour reduction over 90% (from the initial concentration of 250 mg/l) and 155 mg col/g GAC total adsorption capacity (from the initial concentration of 1 g/l).
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