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G. J. Sosa-Santillan, R. Estrada-Rivera, Y. Garza-Garcia, J. Rodriguez-Martinez

Azo dye decolorization in a down flow aerobic biofilm reactor with Opuntia imbricata as support


Wastewater discharged from dyeing process in the textile industry is a major source of water pollution because most dyes are highly colored and difficult to remove by conventional wastewater treatment systems. This paper describes the use of a down flow column aerobic reactor packed with Opuntia imbricata (Natural Support) in the degradation of textile dye and the COD removal. The kinetic results showed that the velocity of COD removal is a function of HRT and the initial velocity of this removal increased with HRT. An increase in aerobic-biodegradation velocity was observed when HRT was increased from 24 to 34 h and thereafter the increase was not significant. The maximum removal efficiency was reached with 34 h of HRT. It can be concluded that 34 h of HRT is sufficient to reach about 90% of COD removal. Initial velocity of aerobic biodegradation of COD was defined as a function of organic loading rate, and was pseudo-first-order-kinetic model. The results of this study indicated that there was an efficient colour removal and degradation in the biofilm reactor packed with natural support. The kinetics of azo biodegradation in biofilm reactor is not yet fully investigated.
Moscow University Chemistry Bulletin.
2006, Vol. 47, No. 1, P. 40

Copyright (C) Chemistry Dept., Moscow State University, 2002
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