Energy and exergy analyses of sewage sludge thermochemical treatment

The aim of this research was to provide a methodology for calculating the energy and exergy balances for the thermochemical treatment of sewage sludge. The results of the balances were assessed and compared for three different scenarios (torrefaction, pyrolysis and pyrolysis combined with catalytic post-treatment of the vapors). The balances were calculated based on previously published experimental data and evaluated under different conditions. The results indicated that the endothermicity decreased with the severity of the process. The energy recovery from the products favored the exothermicity of the processes. The three-step process (pyrolysis of torrefied sewage sludge combined with catalytic post-treatment of the hot vapors) was the least exergy efficient scenario

Mejora de las propiedades del lodo de EDAR mediante torrefacción en un reactor de tornillo sinfín

En el presente trabajo se estudia la torrefacción de lodo de EDAR como pretratamiento para su posterior uso como materia prima en otros procesos termoquímicos. Bajo determinadas condiciones, se ha conseguido disminuir el contenido en oxígeno y aumentar la densidad energética del lodo