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Evaluation of the biodegradation of different types of lubricant oils in liquid medium

2009; Instituto de Tecnologia do Paraná (Tecpar); Volume: 52; Issue: 5 Linguagem: Inglês

10.1590/s1516-89132009000500028

1678-4324

Paulo Renato Matos Lopes, Edério Dino Bidóia,

Vehicle emissions and performance

The aim of this work was to study the biodegradation of different types of automotive lubricant oils adapted to the aqueous medium using a base inoculum and an aqueous inoculum. Four treatments were carried out in two consecutive and similar experiments: T1 (control); T2 (half-synthetic oil); T3 (mineral oil); T4 (used oil). The results showed the following decreasing order of CO2 production in the Bartha and Pramer respirometers: T4 > T2 > T3 > T1. Thus, the used lubricant oil showed with highest biodegradability, followed by the half-synthetic one and the mineral oil. It was also observed that the mineral lubricant presented a longer period of adaptation compared to the half-synthetic one.