Literature Review on Research Study for the Development of Dredged Material Disposal Criteria.

摘要

An extensive literature review was made as a part of an effort to establish relationships between the presence of various contaminants within sediments and the effects of sediment dredging and disposal on water quality and aquatic organisms. The review revealed that there is little or no evidence that a relation exists between bulk-sediment composition and pollution tendencies of dredged sediment. Use of criteria for dredged material disposal that are based on parameters normally used in evaluating environmental impact of domestic and industrial waste-waters is unrealistic because it is considered unlikely that there is a relation between environmental impact of a particular dredged sediment and a particular numerical value for any of these parameters in sediment. The use of a standard Elutriate Test to determine pollution potential of dredged material is superior to bulk analysis because the test recognizes that all chemicals in sediment are not equally available to aquatic organisms. It is concluded that dredged material disposal criteria should be based on a time-concentration-toxicity relationship for each chemical constituent,which could be developed from short-term bioassays with selected organisms. (Modified author abstract)