Discussion
The treatment process, for surface water in which very fine suspended impurities and colloidal impurities that may have escaped the sedimentation tank is called:
Answer: D
The process is Filtration.
After coagulation and sedimentation, very fine suspended particles, colloidal matter and many bacteria still remain. Passing the water through a bed of sand in slow or rapid sand filters removes them by straining, sedimentation in the pores, adsorption and biological action.
Screening removes only large floating matter before treatment, sedimentation is the stage these particles have escaped, and disinfection kills pathogens rather than removing fine particles.
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