Water treatment describes a process used to make water more suitable for different forms of end-use, e.g. drinking water, industrial processes, medical and many other uses.
The goal of all water treatment processes is to remove existing components in the water, improving it for subsequent utilization. Another goal may be to allow treated water to be discharged into the environment without any adverse ecological impact. These processes may be physical such as settlement, chemical such as disinfection or coagulation or biological such as lagooning, slow sand filtration or activated sludge.