The Present Situation and Research Progress of Treatment of Sludge from City Sewage Treatment Plant

With the rapid development of China's economy and urbanization,the waste sludge discharged from city sewage treatment plant also has a rapid output growth. Because of the complex composition of the sludge,if treated improperly,it can cause not only second pollution to the environment,but also a waste of resources of nutrient components in the sludge.Different countries,according to their local conditions for sludge disposal,have different treatment methods with their own characteristics. In this paper,the present situation of sludge treatment is analyzed and different treatment methods are compared. At the same time the global wide study of sludge treatment process and the latest progress were reviewed and introduced,with a special attention being given to the combination of anaerobic digestion and other technology to the treatment and disposal of sludge. Taking into consideration the actual situation of sludge treatment in China,the authors pointed out the technological development trend of sludge treatment.