Leachate samples from a sanitary landfill of Araraquara city and composting usine of Vila Leopoldina, São Paulo, Brazil were
lyophilized to remove the water content. TG/DTG curves at different heating rates were recorded. The second step of the thermal
decomposition of leachate from the Araraquara landfill (CB
1), from the composting usine from Vila Leopoldina (CB
2) from the organic phase extracted (FO) and aqueous phase (FA) were all kinetically evaluated using the non-isothermal method.
By Flynn-Wall isoconversional method the following values were obtained: E=234±3.65 kJ mol−1 and logA=29.7±0.58 min−1 for CB1; E=129±1.66 kJ mol−1 and logA=11.8±0.10 min−1 for CB2; E=51.6±1.35 kJ mol−1 and logA=6.09±0.09 min−1 for FO and E=76.91±6.33 kJ mol−1 and logA=8.88±0.7 min−1 for FA with 95% confidence level. Applying the procedures of Málek and Koga, SB kinetic model (Šesták-Berggren) is the most
appropriate to describe the decomposition of CB1, CB2, FO and FA.
Keywords kinetic parameters - leachate - non-isothermal kinetic