tailieunhanh - Báo cáo " Investigation on basic blue 41 dye degradation by fenton reaction "

Basic blue 41 is a very stable dye using in wool weaving industry. Fenton reaction is often used to decompose stable substances in wastewater. In this study planed experiments method was used to investigate the effect of three factors, that are pH, H2O2 and Fe2+ concentration on COD reduction. The response surface was determined by program Modde , the optimal reaction conditions was: Fe2+ concentration is 120 mg/L, H2O2 concentration is 10 mM, pH is 4. | VNU Journal of Science Natural Sciences and Technology 23 2007 275-279 Investigation on basic blue 41 dye degradation by fenton reaction Nguyen Dac Vinh1 Nguyen Bin2 1 Department of Chemistry College of Science VNU 19 Le Thanh Tong Hanoi Vietnam 2Faculty of Chemical Technology Hanoi University of Technology Dai Co Viet Hanoi Vietnam Received 24 August 2007 Abstract. Basic blue 41 is a very stable dye using in wool weaving industry. Fenton reaction is often used to decompose stable substances in wastewater. In this study planed experiments method was used to investigate the effect of three factors that are pH H2O2 and Fe2 concentration on COD reduction. The response surface was determined by program Modde the optimal reaction conditions was Fe2 concentration is 120 mg L H2O2 concentration is 10 mM pH is 4. 1. Introduction Dyes and pigments released into the environment mainly in the form of wastewater effluents by textile leather and printing industries cause severe ecological problems. These compounds have a great variety of colors and chemical structures and are recalcitrant to microbial attack. Most of the dyes are nontoxic except for azo-dyes which comprise a large percentage of synthetic dyes and are degraded into potentially carcinogenic amines 1-3 . Most of the dyes are non-toxic except for azo-dyes which comprise a large percentage of synthetic dyes and are degraded into potentially carcinogenic amines 2 . Textilewastewaters offer considerable resistance to biodegradation due to presence of the dyestuffs which have a complex chemical Corresponding author. Tel. 84-4-8253503 E-mail nguyendacvinh@ structure and are resistant to light heat and oxidation agents. Biological treatment processes such as aerated lagoons and conventional activated sludge processes are frequently used to treat textile effluents. These processes are efficient in the removal of suspended solids but largely ineffective in removing dyes from wastewater 3 . Chemical treatment .