酒 同©大 Lake or Reservoir Tongji University Coagulation removee dirt and other partcles susponded in water.Alum and othor chemicals are added to water to form Sny sticky particies caled"floc"which attract the dirt particles.The combined weight of the dirt and the alum (foc)become heavy enough to sink to the bottom during sedimentation. Sedlmentation: The heawy particles (floc) sette to the Storage: bottom and the Wster is placed in clear water moves a closed tank or to fitration. roservoir for Disinfection:A small amount of chlorine is added or disinfoction to take some other disinfection method la used to kdl any place.The waler bactera or microorganisms that may be in the water. then fiows through pipes to homes and businesses in the community. F月tration:The water passes through fiters, some made of Souce:AWWA Drnking Water Week Blue Thumb Kt layers of sand. gravel,and charooal thet help remove even smaler particles.Tongji University