Study On The Pyrolysis And Resource Recovery Technology Of Human Fecal Sludge

Fecal is the inevitable byproduct of human everyday life, but there are very limited researches explained the characters of human fecal. This thesis focused on the basic research for the produce and application of human fecal derived biochar, via a pyrolysis process. This study finds that the fecal collected form decentralized septic-tank shared a high solid content, which is a well raw material for biochar producted. The pyrolysis temperature shows the largest effect on the yield of biochar produced compare with residing time and heating rate. The fecal derived biochar, which was produced at500℃and pyrolysised60min, shown well thermal stability and rich in micropore structure, has a great potential for soils application. The TG/DTQ DTA, FTIR results shown that, the fecal pyrolysis process could devied into drying stage, degradation stage and carbonization stage. The degradation stage with the temperature range from150℃to600℃are exothermic reaction process. To deduce the reaction mechanism of the fecal pyrolysis during the major thermal decomposition stage,16mechanisms in solid-state reactions were applied. The reaction order and nucleation mechanisms described the thermal decomposition of the fecal. The energy follow assessment of the human fecal pyrolysis procesee suggested that, the renewable energy like solar energy should be used for the fecal pre-drying, as the moisture has a significant impact on the energy consuming. The carbon emission analysis result shown that, the fecal pyrolysis treatment was a carbon-negative process,114.62kg CO2was reduced during per unit of fecal pyrolysis treated.