Microscreening design

In the integrated membrane system fed with seawater (Figure 12.4A) the pretreatment consists of two rotating microscreens of 150 pm used to remove the larger suspended particles from the water. Successively 8MF units (polypropylene (PP) hollow membranes placed in a vertical position and operated according to the deadend principle) are used to remove the suspended solids completely, algae and to disinfect the water. The MF section is designed to filter 700-750 m3/h [15]. 

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

Individual microscreening manufacturers have specific designs and sizes for various types of installations, and much of the design information is proprietary in nature. Design elements required for nficroscreening include (9) ... 

According to The Colorado Department of Public Health (11), the design of microscreening should take the following into consideration ... 

The design procedure for microscreens is detailed in the following steps (18). 

WMT, Mechanical Filtration—Microscreening, Water Management Technologies, Aquaculture System Design, Integration and Eqnipment Snpply, Hydrotech Drum Filter, URL http //www.w-m-t.com., 2004. 

In pilot-scale tests, we used a mobile unit provided by the Envirex division of the Rexnord Company. The drum was four feet in diameter by two feet long. To aid in planning pilot tests, we also carried out some preliminary one-cycle short-time (less than 30 sec) tests of screens in bench-scale apparatuses, designed by manufacturers to evaluate the potential of microscreens. 

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... 

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