1mW Sewerage Design to MSIG (007)
Secondary Screen Chamber
Secondary screen is tasked to filter floating material and fine particles that pass through the primary screen. This process eliminates the threat on the downstream treatment process. In relation to this, the clear spacing of screen is limited to 12mm or less. Minimum 2 unit of screen is needed, where one of them is standby while the other is on duty.
Some design criteria are the same as primary screen. For instance, design flow velocity is taken as 1m/s, 200mm uPVC should be provided as overflow pipe, and minimum 150mm of freeboard is required. Under average flow, approximately 37 cubic meter of material is screened for every million cubic meter of sewage volume passing through the screen.
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