What is microscreening?

Answer 1

Microscreening is a process used to remove a portion of the residual suspended solids from secondary effluents and from stabilization pond effluents. It is one of the methods involved in advanced wastewater treatment. Microscreening involves the use of variable low-speed (up to 4 r/min), continuously backwashed, rotating drum filters operating under gravity conditions. The principal filtering fabrics have openings of 23 or 35 μm and are fitted on the drum periphery. The functional design of a microscreen unit involves the following considerations: (1) The characterization of the suspended solids with respect to the concentration and degree of flocculation; (2) the selection of unit design parameter values that will not only ensure capacity to meet maximum hydraulic loadings with critical solids characteristics but also provide desired design performance over the expected range of hydraulic and solids loadings; (3)the provision of backwash and cleaning facilities to maintain the capacity of the screen.