Initial therapy (Preliminary Treatment) and preliminary treatment (Primary Treatment) is treated to separate the sand pebbles, and large solid from liquids or waste water by the machine consists of a coarse mesh device (Screen Coarse) mesh. Sand gravel trap tank) Screen (Grit Chamber) preliminary sedimentation tanks (Primary Sedimentation Tank) and a wax removal of blemishes (Skimming Devices), waste water treatment, this stage can get rid of stiff suspension. 50 per cent – 70 and eliminate organic compounds measured in the form of b o d. 25 – 40
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