Surface Water Pre-treatment

Surface water from rivers or lakes is the most variable source of raw water and the most easily accessible.Whilst, in a river the salinity is moderately low because of reduced contact with the soil, the turbidity and the content of micro-organisms could be impressively affected by seasonal variations, reflux of saline water from the sea or storm conditions. The following characteristics may be highlighted:Moderately low salinity. Dissolved solids may be in the range: 50 - 500 mg/litreHigh bacteria contentHigh turbidity and suspended solids content