Traditional thermochemical method promoted the thermal hydrolysis treatment on sewage sludge which had been pretreated by alkaline for 24 hours.The SCOD removal rate of sludge and the biogas production of anaerobic digestion were examined to investigate the effects of alkaline-thermal hydrolysis on the digestibility of sewage sludge.Biochemical methane potential(BMP) experiment results showed that the SCOD removal rate of alkaline-thermal pretreatment is 1.06~1.31 times as high as the traditional thermochem...