Surface Water Treatment; Microscreening

A microscreen may be used to reduce nuisance organisms and organic loadings. It may not be used in place of filtration or coagulation in the preparation of water for filtration. (7-1-24) 01. Design Considerations. The following must be taken into account during design: (7-1-24) a. Nature of the suspended matter to be removed. (7-1-24) b. Corrosiveness of the water. (7-1-24) c. Effect of chlorination, when required as pre-treatment. (7-1-24) d. Duplication of units for continuous operation during equipment maintenance. (7-1-24) e. Automated backflushing operation when used in conjunction with microfiltration treatment. (7-1-24) 02. Design Requirements. Design must provide the following: (7-1-24) a. A durable, corrosion-resistant screen. (7-1-24) b. A by-pass arrangement. (7-1-24) c. Protection against back-siphonage when potable water is used for washing. (7-1-24) d. Proper disposal of water used to wash the microscreen. (7-1-24)