Anaerobic biodegradation of soluble solids in waste activated sludge
pretreatment.
S. E. Vigueras-Carmona, G. Zafra-Jiménez, N. Gómez-Ramos, M. A. Hernández-Montoya, A. M. Zavala-Hernández.
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Abstract. In this paper the effect of different pretreatments on biodegradation of sludge
solids soluble were evaluated. The waste activated sludge was obtained from a municipal
waste water treatment plant and consolidated to 3 % solids. Waste activated sludge
pretreatments were done: alkaline, ultrasound, thermal, alkaline-thermal, alkalineultrasound
and ultrasound–alkaline. Pretreatments resulted in waste activated sludge
solubilization as was demonstrated by an increase of soluble chemical oxygen demand and
reduction of sludge solids. The biodegradability was tested using anaerobic sludge as
inoculum with methanogenic activity of 0.44 g CODCH4·g VSS-1·d-1, the concentration of
volatiles solids in the reactor was 1.5 g VSS·L-1 and the supernatant of sludge pretreatment
was used as substrate, at mean concentration of 3 g COD·L-1. The anaerobic digestion was
performed for six days. For waste activated sludge samples with the above named
pretreatment, the major release soluble VSS was 90 % for alkaline-ultrasound and 89 % for
ultrasound-alkaline. Further, waste activated sludge samples with alkaline-ultrasound
pretreatment presented the major biodegradability (65 %).
keywords: biodegradability anaerobic, pretreatment, soluble solids.

Efecto del pretratamiento sobre la solubilización de lodos residuales secundarios.
Sergio Esteban Vigueras Carmona, Gabriela Zafra, Jimenez, Nancy Gómez Ramos, Michelle A. Hernández Montoya, Abraham. M. Zavala Hernández.
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Objetivos. Determinar la eficiencia de solubilización de lodos residuales secundarios pretratados y determinar la biodegradabilidad de los sólidos solubles en lodos residuales secundarios pretratados.