It isolates turbidity, chromaticity, mud, SS, and organ ic/inorganic matters from the surface water collected from a river or a lake, using the gravity-sedimentati
on technique. It filters the water and produces indu strial water. This is the raw water purification system.
It induces raw water into the clarifier and then, oxidi zes and removes N-S compound COD. In addition, it oxides, dissolves, and reacts N-S compounds with Na NO2, and then, removes Cz2+, dissolved heavy meta ls, and SS at the same time. In addition, by injecting polymer, it helps effective precipitation. At this time, fluorine, which is made as floc, and heavy metal com pounds are isolated with gravity. The sludge which is precipitated at the bottom is moved to the thicken er to be concentrated. And some of it is re-circulated at the bottom of the clarifier, which prevents sludge stopping. It passes through the COD removal process, maintains ph at neutral, and then, re-produces indu strial water.