Abstract: Sludge,as a product of sewage purification,is huge in volume and complex in composition. The sludge is treated and disposed by the way of resource utilization,which can not only solve the secondary pollution problem,but also realize the recovery and utilization of resources,improve the utilization rate of sludge and bring economic benefits. This paper expounds the utilization of sludge resources from three aspects：composting,energy and building materials. Based on the analysis of a sludge treatment plant in a city,the alkaline hydrolysis technology of sludge is introduced,and the economic benefits are discussed.

Key words: sludge, recycling, economic benefit