Resumo

VIGUERAS-CARMONA, S.E. et al. Effect of various pretreatments on anaerobic biodegradability and quality microbiology of waste activated sludge. Rev. Mex. Ing. Quím [online]. 2013, vol.12, n.2, pp.293-301. ISSN 1665-2738.

In this paper was evaluated the effect of different pretreatments on the solubilization, biodegradability and microbiological quality of waste activated sludge. Six pre-treatments were assayed: thermal, alkaline, ultrasonic, thermal-alkaline, alkaline ultrasonic, ultrasonic-alkaline. Pretreatment with that achieved the highest solubilization was ultrasonic-alkaline pretreatment with 85% and this had the highest biodegradability of 65%. Besides, we observed a reactivation of pathogens in all cases, except thermal-alkaline, which implies a decrease in their microbiological quality andbiosolids do not fulfill with the classification type A. The phenomenon of reactivation of pathogens may involve a review of the classification criteria of the biosolids or the inclusion of a parameter storage time prior to final disposal, which would raise lhe costs of disposal.

Palavras-chave : solubilization; pretreatment; pathogens; anaerobic biodegradatlon; methane.

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