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Y. Garza-Garcia, J. Rodriguez-Martinez, J. C. Mata-Berlanga
Opuntia imbricata as support for anaerobic
biofilm in an UASB reactor for denitrification under high nitrate concentration
Abstract
The objective of this work
was to investigate the effects of hydraulic residence time (HRT) and nitrate
concentration on denitrification process in an upflow anaerobic sludge bed
(UASB) reactor with biofilms growed on O. imbricata. Biological
denitrification in a model water was investigated at 12, 18, 25, 26, 31.5 and
62 HRT hours. The nitrate and the
chemical oxygen demand (COD) concentration in the influent were 1.5 and 3.5 g/l
respectively. The UASB type reactor
packed with Opuntia imbricate andinoculated with granular sludge
showed the best results since the UASB reactor contained only granular sludge
had low denitrification rate in all of tested HRT. HRT was one of the most
important operating parameters for nitrate removal in anaerobic reactors and
25h was found to be optimum for denitrification. The highest denitrification
rate, 255 mg NO3/l/h, occurred in UASB type reactor packed with Opuntia
imbricata inoculated with granular sludge. It was demonstrated that the use
of coyonoxtle (O. imbricata) as carrier for biofilm generation
remarkably improved the efficiency of denitrification by ten times and
improvement of COD removal.
Copyright (C) Chemistry Dept., Moscow State University, 2002
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