Screening is the first step in preliminary water treatment. It removes all the floating and suspended coarse particles and fine particles such as wood chips, fibers, plant leaves, aquatic plants and etc...
The main objective is to prevent pumps/pipes/valves/equipment & other appurtenances in the plant from damages due to clogging of particles.
We can identify screening as coarse screening and fine screening. course particle size within 6-150 mm and fine particle size < 6mm.
1. Manual Bar Screens
2. Mechanical Bar Screens
Bar Screens use to separate particles. They are installed at the head-work(entrance) of the treatment plant.
This is a very simple diagram which explain screening process. Bar screen is joined to a approach channel. Nowadays both coarse and fine screens are installed in plants. Many industries in everywhere in the world are using different type of bar screens which suits for there requests. Screen manufacturers are used to produce different screens with various bar spaces and which suits for engineers requests. Water treatment plant designers choose a screen with parameters flow rate, particles sizes, Height of the drain, inclination.
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