With the acceleration of urbanization and the improvement of environmental quality standards in China, the disposal rate and degree of sewage is raising year by year while the by product—surplus sludge generated in the course of sewage treatment is increasing rapidly. As surplus sludge contains a great deal of organic matter, it needs a stabilization treatment before the ultimate disposal. The sludge anaerobic digestion treatment technology should be the most widespread sludge stabilization technology at pr...