Resumo

MOLINA, César F. et al. Preliminary studies of the evolution of the sludge of an anaerobic reactor working with vinasse. Rev. ind. agric. Tucumán [online]. 2016, vol.93, n.1, pp.31-37. ISSN 1851-3018.

UASB (Upflow anaerobic sludge blanket) reactors are widely used in the treatment of wastewater with a high organic load. Its design, able to hold back active biomass, allows achieve high rate of removing organic matter. The main features of these sludge are specific methanogenic activity (SMA), their concentration, expressed as volatile suspended solids (VSS), and granular structure that this sludge take shape in these reactors. This anaerobic biomass is responsible for carrying out the transformation of organic matter into biogas. The present work was conducted to study the changes produced in biomass with respect to the parameters mentioned in a reactor of 500 m³ volume operating with vinasse. The sludge monitoring was performed before, during and after the period of reactor operation (150 days). First sampling was done 59 days before starting-up, to determine the activity´s sludge remaining in the reactor from the previous harvest. This one was considered the initial AME and was 0,20 gCOD / m³.d. After 227 days, 18 after the reactor have stopped, the activity of the sludge was 0,61 gCOD / m³.d. Biomass, measured in terms of volatile suspended solids (VSS), during reactor operation, increased from 1,27 kg/m3 to 6,41 kg/m³, while the particle size of the sludge showed an decrease of the fraction of high measurement.

Palavras-chave : UASB; particle size; SMA; VSS.

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