Filter helps city meet phosphorus limits - Case Study

Problem

The operators at the Lakes Area Sewer Authority treatment plant in Cass County, Mich., sought an efficient filtration system to meet stringent summer phosphorus limits. The city wanted a high-rate filtration system with a small footprint to fit inside a small building, with low wash water usage, easy cleaning and low maintenance cost.

Solution

Based on a successful pilot test, the operators chose the Fuzzy Filter from Schreiber for its ability to achieve high phosphorus removal efficiency by capturing very small flocs (less than 5 microns) and reducing chemical consumption. The high-rate (30-plus gpm per square foot) filter has a small footprint and reduces heating requirements of the filter building.

Result

The unit consistently produced effluent with phosphorus below 0.2 mg/L (more than 98 percent removal efficiency). It provided more than 60 percent chemical savings and produced less than 2 percent wash water return. The operators are satisfied with its performance and ease of operation and maintenance.