Preliminary Treatment Processes

Preliminary Treatment Processes

	Preliminary Treatment Processes Water entering the treatment plant may contain large floating and suspended solids like leaves, twigs and silt particles. To protect the main units of a treatment plant and to aid in their efficient operation it is necessary to remove these materials. Otherwise they could obstruct the flow or damage the equipments in the plant. Various procedures have been employed for the preliminary treatment in water treatment plants.
Screening and Straining This is the first stage in the preliminary treatment process. Coarse screens with openings of about 75mm are used to prevent large objects. Mainscreens are provided in the form of a mesh with openings of 5-20 mm through which the incoming water passes. To prevent overloading of the mesh with the collected solids, the mesh is slowly rotated so that the solids can be removed at regular intervals. The screenings removed from the water are normally returned to the source end.
Microstraining Microstrainer is a finely woven stainless steel mesh with apertures of size about 20-60µm. These microstrainers are effective in the removal of relatively small solid particles and algae from water. Frequent clogging of the mesh is a problem in microstrainers because of the small apertures. So mesh in these are of drum type which can be rotated around a central axis and the mesh is continuously washed, clean by high pressure sprays.

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