A Study on the pyrolysis characteristics of sewage sludge

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  • A study on the pyrolysis characteristic of sewage sludge

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This research analyzes pyrolysis characteristics of sewage sludge though pyrolysis experiments of sewage sludge from 4 domestic sewage treatment plant. First, before carrying out pyrolysis experiment moisture content, apparent density, thermogravimetric analysis, ultimate analysis, heating and elemental analyses of sludge were done based on sludge characteristics. Second, pyrolysis experiment were done in 500, 600, 700, 800°C, the waste reduction rate of sewage sludge and characteristic of char, tar, gas formed during pyrolysis process were analyzed. Specially, quantity of pyrolysis gas was compared with that predicted by CEA Code. Third, recycling possibility of pyrolysis by-products were estimated for most suitable pyrolysis condition. Pyrolysis experiment resulted decreasing tendency of char and tar as temperature rises. And in case of gas as temperature rises, hydrogen increased; carbon dioxide showed decreasing tendency, but methane, carbon monoxide, hydrogen sulfide did not showed regular trend.

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