Hydroscreen manufactures screens in many different configurations to be utilized for municipal water and wastewater treatment and plant diversions. One of the most common problems for small plant diversions is the removal of debris and coarse sediments, which plug filters and clog screens. The aqua-shear screen, in the .5 mm size, provides the ultimate in debris and sediment removal. The screens are capable of removing 90% of sediments .25 mm and larger, and virtually all of the debris, such as leaves, pine needles, and moss, that commonly move down streams. The advantages include:

• No moving parts
• Simple and inexpensive to install
• No energy requirements
• Self cleaning
• Corrosion resistant 304 stainless steel
• Reduced plant maintenance costs

The water diversion structures are usually installed with flow by-pass weirs, sluice gates, and the Hydro-Shear Coanda Effect screens. This design incorporates excess flow by-pass, sediment trapping and by-pass, and debris and reduced sediment load plant influent. Where required, the screened diversion also prevents the entrance of fish into the water treatment plant.

For small Municipal water treatment plant intakes the Hydro-Shear Coanda Effect screen will significantly cut maintenance costs, and reduce the amount of coagulation chemicals used in water treatment. Fine screens in the range of .2 mm (.0078 in.) thru .5mm (.019 in.) remove all but extremely fine suspended sediment particles.

An economic life cycle cost analysis will show that finer screens, which produce a high quality plant influent, are cost effective. The area of a finer screen, for an equal volume of flow, will be slightly larger to make up for headloss through the openings. This added cost, however, will be recouped in a short period of time.

The screen, regardless of opening size, is self cleaning and requires little or no regular maintenance. Hydroscreen will work with the utility engineers or consultants to pilot individual screen selections to determine optimum screen selection based upon the specific water pretreatment needs.