The new Aqua Guard® UltraClean™ represents the next generation of in-channel fine screening, outperforming the original design in side-by-side capture rate tests by over 50%. This superior performance comes from a series of patent-pending improvements in the “head” of the Aqua Guard® UltraClean™ screen, each drawn from over 30 years of experience with the classic Aqua Guard® platform. Designed with the operator in mind, the Aqua Guard® UltraClean™ also offers easier access to key areas of the screen such as the brush, which has been reengineered to reduce routine maintenance by up to 75% over the original version. The Aqua Guard® UltraClean™ technology is available both on new screens, and as a new “head” retrofit for existing Aqua Guard® element screens.
Principle of Operation
The Aqua Guard® UltraClean™ screen, a self-cleaning in-channel screening device, utilizes a unique filter element system designed to automatically remove solids larger than element spacing. Aqua Guard® screen filter elements form a 3-dimensional grid that ensures better solids capture rates when compared to rake bar screens that utilize single-dimensional vertical bars for solids capture. A specific configuration of filter elements is mounted on a series of parallel shafts to form an endless moving belt that collects, conveys and discharges solids for further processing or disposal. Solids contained in a wastewater flow are captured on the filter elements and carried upward on the belt assembly to discharge at the rear of the unit. Two-stage screening is achieved which results in minimal headloss. Coarse filtration occurs on the forward screen face and fine filtration on the recessed face. As the rake tip of one row of filter elements passes between the shank arm of the lower row, the elements automatically clean themselves. The unit is equipped with water sprays and a rotating brush that provides additional removal of solids.
Standard screen widths are 1.0’ to 9.0’ depending on the model with flow rates up to 100 MGD with a single unit. Two frame styles are available depending on space and channel depth requirements. Type A is a pivoting design and Type T is a stationary design. The Aqua Guard® UltraClean™ screen can be installed at angles 60°, 75° and 85° depending on the frame and model selected. For maximum efficiency of operation, greater flow rate and higher solids removal, the recommended angle of inclination is 75°. The screen conveys solids up and out of the channel at a speed of 7ft/min. The maximum amount of debris, in cubic yards per hour that can be removed from the stream is a function of model and angle. Movement of the screen can be continuous or intermittent. However, intermittent operation is recommended. This allows a mat of solids to build up on the filter-rake elements which increases the solids capture rate.