Estudio en paralelo de dos sistemas anaerobios con y sin separación de la fase hidrolítica para la generación de biometano
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Date
2008
Journal Title
Journal ISSN
Volume Title
Publisher
Corporación Universitaria Lasallista
Área Metropolitana del Valle de Aburrá
Área Metropolitana del Valle de Aburrá
Abstract
Introduction. Urban societies produce solid and liquid waste in a growing quantity. For a long
time, several alternatives have been used for managing such wastes in an integrated way, but
those alternatives are now out fashioned.
Objective. To compare two anaerobic digestion systems with and without separation of the
hydrolytic phase in a laboratory scale, for the biomethanization of the organic fraction of urban
solid waste (FORSU, in Spanish) and domestic waste water (ARD in Spanish), evaluating its
performance under efficiency for eliminating organic matter and methane generation terms.
Materials and methods. Two systems of anaerobic methanization were compared in a laboratory
scale. Mesophilic, the first one, was an anaerobic reactor of ascending flow (R1) and
the second was a system separated into two phases: Hydrolytic reactor of ascending flow (R2)
and an anaerobic ascending flow reactor of sludge blanket (UASB). The carbon source used
was the organic fraction of urban solid waste and domestic urban waste water. Both systems
were evaluated during 120 days.
Results. For R1, the maximum organic charge speed (VCO in Spanish) was 4,7 Kg, chemical
oxygen demand (COD)/m3-d, time of hydraulic retention (HRT), 24 hours, pH 7,01 at
7,77 to obtain a methane performance of 0,17 L/g initial volatile solid. On the other hand,
the R2+UASB, the maximum organic charge speed to depurate was 17 Kg chemical oxygen
demand m3-d, the HRT for R2 was 24 hours and for the UASB was 12 hours, with a pH for
R2 between 4,92 and 5,34, and for the UASB, between 6,60 and 7,80, obtaining a methane
performance of 0,29 L/g initial volatile solid. The highest production of volatile fatty acids was
registered in R2 with 46,96g/L expressed in acetic acid (HAc). The elimination rate of chemical
oxygen demand in R1 was 91% and the elimination rate of volatile solid was 92%. For R2 +UASB
the chemical oxygen demand eliminated was 96% and the volatile solid was 97%. Conclusion. Applying a hydrolytic reactor to an UASB allowed removing more organic charge
and a better methane production.
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Keywords
Hidrólisis, Corporación Universitaria Lasallista, Área Metropolitana del Valle de Aburrá, Residuos sólidos, Aguas residuales domésticas, Sistemas anaerobios, Biometano, Reactor anaerobio de manto de lodos de flujo ascendente (UASB), Tratamiento de aguas residuales