Belt filter presses are used for dewatering sludges, like lime sludges in drinking-water systems and waste sludges from wastewater systems. DJ Gongol & Associates serves as the representatives in Iowa and Nebraska for the Charter Machine Company, which manufactures American-made belt filter presses based upon Roediger technology.

As sludges are deposited on the belt filter press, they pass first through a gravity section, where water is drained via the natural flow of gravity pulling the water through the perforated belt. As the sludge passes through, it is moved and rolled by multiple rows of plows that force and turn the sludge in order to extract the most water possible from the mixture.

The sludge is then conveyed into a wedge zone, where it is progressively compressed as it is moved through the zone, extracting more water as it is passed through.

The final section is a series of rollers through which the sludge is compressed in order to maximize the drying effect. Charter Machine Company has developed a unique design called the Tower Press that stacks the rollers vertically, to maximize the drying effect while minimizing the footprint of the press. While Charter Machine can (and does) manufacture conventional horizontal presses, the Tower Press comes with a unique capacity to offer large-scale drying even to a small plant.

last revised September 2010