Effect of Pre-Drying on the Pore Structure Development of Sewage Sludge during Pyrolysis

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Abstract
Pyrolysis of digested sewage sludge was conducted in a nitrogen atmosphere in this study. The effects of temperature and air pre-drying on the surface area and pore structure development were investigated. It is found that the BET surface area of the chars derived increases with increasing temperature. Pre-dried sewage sludge results in higher surface area in the char than the raw sludge. It is demonstrated that pre-drying has an effect of promoting micropore structure development, whereas there are more mesopores and macropores developed in the raw sludge char due to possible pore enlargement resulting from volatile gas bubbling out of the softened intermediate product during pyrolysis in the temperature range of 550°C – 650°C.

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