Study On Treatment And Disposal Of Sludge From Waterworks Using Yangtze River As Raw Water

With the water pollution becoming more and more serious, waterworks sludge treatment project has been added up to drinking water treatment system in order to achieve the zero discharge of waste water. Before designing the project, detail conditions related to the sludge water should be researched seriously. Since there is little study on sludge treatment of lower reaches of Yangtze River, we study the thickening and other qualities of sludge from a certain waterworks using Yangtze River as raw water under the commission by Changzhou General Water Supply Company.This thesis illustrated the meaning of study on sludge treatment of waterworks, reviewed the development on this subject home and abroad, introduced the character and general treating method of sludge water, meanwhile concluded the thickening qualities of sludge from waterworks using Yangtze River as raw water by analyzing a serious of testing date.Through intermittent experiment, which was made in summer, autumn and winter these three seasons, we have measured the content of suspend solid in raw water and its relevant turbidity, and concluded the relationship between the two. The amount of solid dry sludge from the waterworks has been estimated roughly according to the relationship, and also the amount of liquid sludge water has also been estimated according to the spot observation. Next, the minimum solids-handling capacity has been ascertained by doing natural sedimentation and coagulate sedimentation experiments of sludge water. The sedimentation effect before and after adding PAM has also been compared. Then, we obtained the thickening qualities of sludge water through using inclined plane thickener and determined the optimum running parameter of thickener. At last, the granular size distribution, component and specific resistance of sludge have been tested. Additionally, methods for mechanical dewatering process and disposal of sludge cake have been concluded through reading literature, collecting information, investigating spot and other works. The study indicates that the sludge, which is from waterworks using Yangtze River as raw water, has good performance of thickening which favors the treatment, reduces the residence time of sludge water and the area of the thickener. Meanwhile, it provides the scientific reference for planning the sludge treatment project of waterworks using Yangtze River as raw water in the future.