Dewatered and Decontaminated Disposal of Dredged Sediments Using Geotextile Bags, Containers and Tubes

摘要

The use of geotextile bags, containers and tubes has progressed over the past 30-years from sand filling to therndewatering of river and harbor sediments and, as described in this paper, to the decontamination of those sedimentsrnwhen they are polluted. Unfortunately, such pollution is the case for approximately 5% of sediments dredged annually inrnthe United States.rnAfter reviewing the enormity of the situation, various classifications of geotextile flexible forming systems are presented.rnA performance test, called the pillow test, is described and used in the evaluation of flocculants which are included tornefficiently dewater fine grained silt and clay sediments. Such flocculants are critical so as to minimize the negativerneffects of filter cake buildup on the inside of the geotextile forming systems. The paper then addresses severalrndecontamination possibilities aimed at encapsulating the contaminants within the dewatered sediments allowing forrnnonpolluted effluent removal. In this regard, examples of the efficiency of charcoal are presented along with estimatedrncosts.