Polymers for Dewatering Dredged Sediments Case Study

This case study details the Southwest Brooklyn Marine Transfer Station, a waste handling facility in Brooklyn, New York, which is part of the New York City Solid Waste Management Plan. The facility is designed to process and compact garbage for shipment to out-of-state landfills. The study outlines the dredging operations required to prepare the site, where approximately 5400 cubic yards of sediments were removed from the shoreline and bay. The sediments were mechanically dredged using a clamshell bucket and placed into a scow for dewatering. A coagulant dosage program was developed using FLOQUAT® FL 4420, which significantly improved the settling time of the dredged materials. The results indicated that the treated materials settled at a rate two times faster than untreated materials, leading to cleaner water discharge and allowing the dredging project to be completed on schedule. The study concludes that the solution provided by SNF was environmentally friendly and compliant with local guidelines.