College of Engineering 1D d Runoff from snowmelt into a high

College of Engineering 1D (d) Runoff from snowmelt into a highly urbanized stream TEMPE UNIVERSITY 5, A softening water treatment plant typically treats: (496) (a) Surface water (b) Wastewater (c) Groundwater (d) All of the above 6. During the treatment of water, alum is used to remove: (406) (a) Hardness (b) Colloidal particles (c) Pathogens (d) Dissolved organic matter

Solution

5) a) since most common and economical source of water for treatment plant is river water, so a softening water treatment plant treats surface water and remove the compounds like calcium bicarbonate, magnesium carbonate and magnesium bicarbonate

waste water is discharged directly into river without any softening

6) alum is used to remove the colloidal particles as they do not settle easily, alum added into water forms a gelatinous gel compound which trap colloidal particles on its surface, becomes heavy and settle down in settling tank