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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


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.
Moscow University Chemistry Bulletin.
2006, Vol. 47, No. 1, P. 44

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