Flow filter ensures cleanLeopold® granular bed filters from ITT Water and Wastewater are designed and engineered to achieve the specific performance requirements of municipal water and wastewater treatment plants. Designed according to loading rate, run time, head loss and based on upstream and downstream process conditions, the Leopold filter can be arranged with a front flume, centre flume or H flume to achieve the most cost effective layout.
Leopold Engineered Filter Media® anthracite is the lowest uniformity coefficient (UC) anthracite filter media available, delivering more efficient backwashing and solids removal. This typically produces consistent improvements in turbidity removal and smaller changes in effluent turbidity during periods of peak influent turbidity.
The filters employ an upflow wash water with full bed fluidisation to ensure thorough cleaning of the filter media. The filters also employ a combined air/Water washing procedure which provides an effective cleaning action as a result of the higher shear forces in the media bed and the abrasion between grains.
Both the backwash water and air scour are introduced into the bottom of the media bed through an underdrain system featuring advanced Leopold Type S technology. The Leopold Type S Technology Underdrain is designed to provide uniform distribution of wash water and air to clean every section of the filter without media disturbance.
FilterViewTM SCADA software forms part of the Leopold FilterWorxTM Automatic Control System and monitors and controls Leopold filter systems. It features a standard communications protocol that allows ease of integration into the majority of other plant DCS and SCADA systems, making it user friendly and flexible. The filter control package constantly monitors essential parameters in the filter plant processes such as filtrate quality, to ensure it meets regulatory requirements and provides optimum filtration. It automatically adjusts flow rates to compensate for customer requirements.
By continuously monitoring water quality and filter conditions, Leopold filter controls can automatically initiate and control the backwash sequence. This means that the filter is cleaned when it needs to be cleaned, as conditions require, to the necessary standards of cleanliness. This results in optimised product quality at the lowest possible cost, while at the same time extending the life of the filter.
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(The diagram illustrates the flat bottom flume filter).
