Treatment Process Of Surface Water And Studies On Residual Alumimun Content

Recent years, especially the north and costal cities have lacked of water resources. At the same time, the water environment has suffered sever pollution and destruction after the rapid development of industry and agriculture. Most domestic water plant reduced the level of polluted drinking water by increasing the amount of coagulant dosage because of shortage of water resources and water pollution. Remained aluminum content in drinking water will endanger human being and ecological environment. With the wide use of aluminum salt coagulant, human being and living environment will face a variety of adverse consequences if they intake aluminum too much. This thesis mainly study the factors which influence aluminum content in surface water coagulation process and how to measure the content of aluminum effectively in order to control remained aluminum of water plant.They inspect remained aluminum in water in terms of drinking water standard through coagulation test cup experiment. The study found that there are several factors influencing remained aluminum in supply water system, such as the quality of raw water, type and dosage of coagulant, type and dosage of coagulant aids, rate of filtration and thickness of filter layer.The study shows that several factors could help to eliminate remained aluminum in surface water by adjusting quality of raw water and type and dosage of coagulant, applying coagulant aids and modulating rate of filtration and thickness of filter layer. This research findings will provide the theoretical and practical guiding on the right choice of coagulant, optimization of hydraulic condition of coagulation and parameter of the best water purification in order to meet the national standard.