Pyrolysis and influence of heating rate on industrial sewage sludge
工业废水污泥的热解及升温速率对热解的影响

The pyrolysis kinetics properties of three typical industrial sewage sludge(textile dyeing,medicine and wastewater) were investigated by simultaneous thermogravimetric analysis(TGA).The results indicate that industrial sludge is a kind of high volatile,low fixed carbon and low calorific value fuel.The digested sludge has a higher ash and lower volatile content.The pyrolysis process can be divided into three stages,and the second weight loss stage-volatile release process is dominant.Heating rate has a significant impact on the final weight loss rate.The thermal decomposition becomes more intense with increasing heating rate,but the change of final weight loss rate is related with the kinds of industrial sewage sludge.To improve the thermal decomposition performance,the different heating rate should be adopted for different kinds of industrial sewage sludge.Different kinds of sludge have the different pyrolysis characteristics.For textile dyeing sludge,there are two pyrolysises in the volatile release process.The activation energy of medicine sludge is minimal but the activation energy of textile dyeing sludge in the second volatile release process greatly increases than that in the first.