Non-isothermal kinetic for lyophilized leachate from sanitary landfill and composting usine.

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 (CB1), from the composting usine from Vila Leopoldina (CB2) 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 log A=29.7±0.58 min−1 for CB1; E=129±1.66 kJ mol−1 and log A=11.8±0.10 min−1 for CB2; E=51.6±1.35 kJ mol−1 and log A=6.09±0.09 min−1 for FO and E=76.91±6.33 kJ mol−1 and log A=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. [ABSTRACT FROM AUTHOR]