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