Thermal drying behavior of the municipal sewage sludge in nitrogen atmosphere was explored using a thermal analysis technique under isothermal and nonisothermal drying conditions. The Midilli model, MR ¼ expðÀkt n Þ þ bt, was the best suitable for predicting both the isothermal and nonisothermal drying behavior of the sewage sludge with the highest R 2 . The isothermal drying apparent activation energies of the first falling rate period and the second falling rate period were 18.03 and 11.87 kJ mol -1 , respectively. The nonisothermal drying apparent activation energies of sewage sludge were from 33.61 to 47.37 kJ mol -1 in the first falling rate period and from 20.47 to 33.43 kJ mol -1 in the second falling rate period, respectively. In two falling rate periods, the dominant mechanism functions for the isothermal drying were identical, À lnð1 À aÞ. The dominant mechanism functions for the first falling rate period and the second falling rate period in the nonisothermal drying were described by ½À lnð1 À aÞ 1=2 and ½À lnð1 À aÞ 1=3 , respectively.
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