Development of biofilms in anaerobic reactors |
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Authors: | Graciela González Florina Ramírez Oscar Monroy |
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Institution: | (1) Depto. de Biotechnología, Universidad Autonoma Metropolitana, Apdo. Postal 55-535, 09340 Iztapalapa, D.F., Mexico |
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Abstract: | The development of biofilms in polyethylene sheets and particles was studied using downflow reactors with synthetic nutrient media made up of a mixture of volatile fatty acids. Results suggest a preferential immobilization of acetoclastic organisms in the inner space of the surfaces and the colonization by the butyrotrophic bacteria in the outer layers. After 101 days the bioparticles reached a specific acetociastic activity of 72.45 mol acetic acid/ g protein ·h while the biofilms had 58.80 mol acetic acid/ g protein attached ·h. Due to the low density of the polyethylene particles low fluidization velocities would be needed (2m/h) in a downflow fluidized bed reactor. |
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