Ultrasound to Decontaminate Dredged Sediments

9700318随着《海洋倾倒法》的通过和缺乏遏制设施，每年处置近700万吨疏浚的沉积物成为纽约/新泽西大都市区的一个主要问题。泥浆形式的疏浚沉积物需要脱水、修复和处置。疏浚底泥中的污染物(重金属和有机物)通常附着在粘土和淤泥组分上。在这项研究中，提出了应用超声波技术，结合部分真空下的萃取，来去除疏浚残渣中的污染物和水分。提出了一种具有三种不同工艺的完整处理技术，用于商业实施。在这项研究中，将评估两个涉及超声波的过程。在第一个过程中，超声波探头附近的粉尘从散装疏浚的悬浮液中分离出来，并使用亚大气压进行去除。在第二个过程中，粉尘被净化，水中的污染物被利用亚大气压去除。修复后的土壤可以作为清洁材料倾倒在海洋中，也可以用于建筑。提取的有机和无机废物将利用膜技术进行浓缩，并在危险废物填埋场处置。这项技术可以很容易地直接添加到挖泥船中，以最大限度地减少材料处理。***

9700318 With passage of the Ocean Dumping Act and the lack of containment facilities, the disposal of nearly 7 million tons of dredged sediments per year become a major problem for the New York/New Jersey metropolitan area. The dredged sediments in a slurry form need to be dewatered, remediated, and disposed. The contaminants (heavy metals and organics) in the dredged sediments are usually attached to the clay and silt fractions. The action of applied ultrasound techniques, coupled with extraction under partial vacuum, is proposed in this study to remove contaminants and water from dredged residues. A complete treatment technology with three different processes is proposed for commercial implementation/. In this research, two processes involving ultrasound will be evaluated. In the first process, the fines near the ultrasound probe are separated from the bulk dredged suspension and are removed using sub-atmospheric pressure. In the second process, the fines are decontaminated and contaminants in water are removed using sub-atmospheric pressure. The remediated soil can be ocean- dumped as clean material or used in construction. The extracted organic and inorganic waste will be concentrated using membrane technology and disposed of in hazardous waste landfills. This technology can be easily added directly into a dredging vessel to minimize material handling. ***