Microscreening process

Introduction Microscreening Process Design Criteria Backwashing Design oe Microscreens Energy and Costs Design Example Nomenclature Reeerences Appendix... 

Engineering-Science, Inc., Investigation of Response Surfaces of the Microscreen Process, Report No. 17090EEM, U. S. Environmental Protection Agency, Washington, DC, 1971. 

This is mechanical separation process for removal of suspended sohds by passing the waste-water through a microscreen. A removal efficiency for TSS is 50-80% depending on the pore size of the microscreen to be used. 

When the required particulate removal eflBciency has been determined for each size fraction in the distribution, the technical feasibility of available solids/liquid separation processes must be evaluated. Such a screening procedure will provide the framework for determining the extent of analytical modeling or pilot plant studies needed to develop process design criteria. The solids/liquid separation processes used in water and wastewater treatment exploit the physical-chemical properties of the particulates to achieve rapid and therefore economical separation from the treated water. Microscreening devices remove most particulates with at least one dimension larger than the minimum opening in the... 

For particulate distributions of relatively low mass concentration ( < 50 mg/L) with Znv > 30 /xm, microscreening devices may be a feasible separation process, provided the particulates have a rigid structure. Higher mass concentrations rapidly clog the screens, causing ineflBcient operation. More concentrated suspensions of large particulates are handled economically by sedimentation, which is eflBcient for removing particulate suspensions with Zxv > 100 /xm (33). 

---