![]() ![]() Removed sediment treatment: Removed sediment is sometimes treated in order to facilitate reuse prior to aquatic or land disposal. Management is achieved through the placement of materials into facilities such as sanitary landfills, hazardous material landfills, CDFs, or confined aquatic disposal (CAD) facilities. Typical equipment used includes plate-and-frame presses, which are effective but operate in batch mode, and belt filter presses, which may be less effective but can be operated continuously.ĭredged Material Disposal Methods: Disposal of dredged is the placement of materials into a controlled site or facility to permanently contain contaminants within the sediment. Geobags with chemical conditioning have been used at many sites for efficient gravity dewatering of large volumes of sediment in relatively small spaces.ĭuring active mechanical dewatering, equipment or materials are used to apply external pressure and can sometimes achieve a solids content of up to 70% by weight. The more thinly the sediment can be spread at the dewatering site, the more effective passive dewatering by evaporation will be. During passive dewatering, carrier water is removed primarily by gravity separation and to a lesser extent by evaporation. Passive dewatering requires sufficient space to store the sediment during the separation process. The nature and extent of dewatering needed depends on the sediment characteristics and the type of dredging, transport, and disposal methods planned for the removed material. If the material is to be reused or further treated, dewatering also leads to reduced transportation cost and improves handling properties. ![]() Dewatering reduces the water content and hence the volume and weight of the disposed sediment. Management of sediment removed through dredging requires integration of the dredging technique with transportation, treatment, and final disposal or reuse of the dredged material in an approved location.ĭewatering: Dewatering may be necessary to prepare dredged materials for disposal. ![]()
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