Abstract

DURAN HINOJOSA, Ulises; MONROY HERMOSILLO, Oscar; GOMEZ HERNANDEZ, Jorge  and  RAMIREZ VIVES, Florina. The effect of oxygen and glucose on polymeric resin methanogenesis and mineralisation. Rev. colomb. biotecnol [online]. 2010, vol.12, n.1, pp.39-46. ISSN 0123-3475.

The effect of dissolved oxygen concentration and glucose on polymeric resin compounds’ methanogenesis and mineralisation was examined in batch cultures. They were inoculated with sludge from an upflow anaerobic sludge blanket reactor fed with polymeric resin compounds and 1.0 mg L^-1 steady-state dissolved oxygen. All tests were carried out with 1,500 mg L^-1 chemical oxygen demand (COD), at 30±2°C, with 23.8 g L^-1 volatile suspended solids (VSS) as inoculum and 1:1 COD/VSS ratio. The effect of different dissolved oxygen concentrations showed that COD efficiently removed glucose whilst methanogenic activity remained constant at low concentrations (0.6 and 1.0 mg L^-1), but polymeric resin compounds’ COD removal efficiency increased 58.1±1% whilst methane yield decreased, due to the higher aerobic mineralisation of carbon to carbon dioxide. The result of different glucose/polymeric resin compound ratios in the presence of 0.6 mg L^-1 dissolved oxygen showed that glucose did not improve polymeric resin compound removal. However, methanogenic activity decreased by 75% with polymeric resin compounds as substrate compared to methanogenic activity with glucose as sole carbon source, suggesting that the presence of glucose promotes conditions for higher tolerance to oxygen. The presence of low dissolved oxygen concentrations therefore promotes polymeric resin compounds’ methanogenesis and mineralisation.

Keywords : Polymeric resin compound; glucose; methanogenesis; mineralisation; dissolved oxygen.

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