Biodegradação aeróbia de lodo de esgoto sanitário e óleo lubrificante.

Abstract

The used oil discard is an evident fact of great worry considering the serious problems it can provoke when comes incontact with aquatic and terrestrial systems. Aerobic biodegradation of lubricant oil with sanitary sewage sludge in batch reactors was studied in the presentwork. For performing this work, three cylindrical reactors of 8 L capacity each, equipped with an aeration system of air flow rate 45 L.min-1 and an agitation system of rotation capacity 90 rpm were constructed, installed and monitored. The reactors were loaded with substrate containing different proportions of sanitary sewage sludge, lubricant oil and surfactant. The operational system was monitored for a period of 65 days. The monitoring process consisted in determination of physicochemical, thermal (TG/DTG/DSC), infrared absorption spectroscopic parameters and elemental analysis in the samples of lubricant oil, sanitary sewage sludge, and surfactant and of the substrates formed before and after the aerobic biological treatment. The results obtained confirmed that the applied aerobic biological treatment caused a reduction in organic material in all the studied substrates and also caused significant modification in thermal behavior of the substrates after the functioning period.