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2011 (Vol. 3, Issue: 6)
Article Information:

Nitrate Reduction, Sulfate Reduction and Methanogenesis Interrelation in Fixed and Suspended Bed Batch Reactors

S.Y. Martínez Amador, Y.Garza-García, J.A. Rodríguez de la Garza and J. Rodríguez Martínez
Corresponding Author:  Silvia Yudith Martínez Amador 

Key words:  Biofilm system, macerated anaerobic sludge, Opuntia imbricata, substratum, , ,
Vol. 3 , (6): 591-596
Submitted Accepted Published
2011 August, 03 2011 September, 08 2011 November, 15
Abstract:

This study was focused on the interrelation among nitrate reduction, sulfate reduction and methanogenesis in fixed bed and suspended reactors. Dried stems of the cactus Opuntia imbricata were used as substratum for biofilm growth. Three anaerobic treatment systems: Biofilm and Macerated Anaerobic Sludge (BMAS), Biofilm formed by macerated anaerobic sludge (B) and Macerated Anaerobic Sludge (MAS) were studied. Experiments were carried out in batch reactors containing 250 mL of synthetic wastewater (0.5, 1.2 and 7.6 g/L of nitrate, sulfate and acetate, respectively). The nitrate reducing rate was of 6.0, 5.9 and 3.29 g NO3- l-1d-1×10-1 for BMAS, B and MAS systems, respectively. The sulfate reducing rate was two times higher for BMAS and B systems (11.5 and 11.3 g SO4 2- l-1 d-1×10-2, respectively) than MAS system (4.8 g SO42- l-1 d-1×10-2). Methanogenic rate was 1.5 times higher for BMAS and B systems (4.2 and 3.8 g CH4 l-1 d-1 ×10-1, respectively) than MAS system (2.15 g CH4 l-1 d-1 ×10-1). In MAS system, the processes were not simultaneous but in stages, contrary to observed in the removal of nitrate, sulfate and organic matter in the biofilm containing systems. Biofilm containing systems carried out nitrate reduction, sulfate reduction and methanogenesis processes more efficiently than MAS system.
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  Cite this Reference:
S.Y. Martínez Amador, Y.Garza-García, J.A. Rodríguez de la Garza and J. Rodríguez Martínez, 2011. Nitrate Reduction, Sulfate Reduction and Methanogenesis Interrelation in Fixed and Suspended Bed Batch Reactors.  Current Research Journal of Biological Sciences, 3(6): 591-596.
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