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51.
Environmental Monitoring Of Remedial Dredging At The New Bedford Harbor, Ma, Superfund Site 总被引:1,自引:0,他引:1
Bergen BJ Nelson WG Mackay J Dickerson D Jayaraman S 《Environmental monitoring and assessment》2005,111(1-3):257-275
New Bedford Harbor (NBH), MA, is a Superfund site because of high polychlorinated biphenyl (PCB) concentrations in the sediment.
From April 1994 to September 1995, a remedial dredging operation (termed the “Hot Spot”) removed the most contaminated sediments
(PCB concentrations greater than 4000μg/g) from the upper harbor. During remediation, a monitoring program assessed the potential
environmental impacts to NBH and adjacent Buzzards Bay. The monitoring program was developed with input from federal, state,
and local authorities. Site-specific decision criteria were established to assess net PCB transport, water column toxicity,
and PCB bioaccumulation in blue and ribbed mussels (Mytilus edulis and Geukensia demissa, respectively). The remediation was completed without exceeding PCB net transport or acute toxicity effects specified in
the decision criteria. In addition, PCB bioaccumulation in mussels during this time period was not significantly greater than
pre- or post-operational measurements. The results indicated that approximately 14000 cubic yards of highly PCB contaminated
sediment were permanently removed with minimal environmental effects. The lessons learned during this operation, as well as
previous pilot studies at the site, will be used to make full-scale remedial efforts in NBH more efficient and environmentally
protective. 相似文献
52.
Thomas J. Fredette 《Chemistry and Ecology》1998,14(3):231-239
Since 1977, the US Army Corps of Engineers Disposal Area Monitoring System (DAMOS) has monitored New England's offshore dredged material disposal sites. DAMOS has shown that by using monitoring information to make management decisions, open water disposal of dredged sediments is possible with minimal environmental impact. Over the past two decades, DAMOS has answered many of the key questions about dredged material impacts. Yet the need for such a programme remains strong from both the technical and public interest perspectives. the programme continues to monitor projects that are extending our knowledge in the areas of deeper water capping, geotechnical behaviour of capping and capped materials, and biological response to contaminants. These investigations, along with the need for specific disposal site surveys, will continue to provide valuable technical information needed by the public, policy makers, and regulators to make critical decisions on dredged sediment management. 相似文献
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Spencer A. Peterson 《Journal of the American Water Resources Association》1982,18(3):423-436
ABSTRACT: Fresh water lake sediment removal is usually undertaken to deepen a lake and increase its volume to enhance fish production, to remove nutrient rich sediment, to remove toxic or hazardous material, or to reduce the abundance of rooted aquatic plants. Review of more than 60 projects and five case histories reveals that the first three objectives are usually met through sediment removal. Dredging to control aquatic plants has not been well documented. Disadvantages of dredging include cost, temporary phosphorus release from sediment, increased phytoplankton productivity, noise, lake drawdown, temporary reduction in benthic fish food organisms, the potential for toxic material release to the overlying water and potential for environmental degradation at the dredged material disposal site. The technique is recommended for deepening and for long range reduction of phosphorus release from sediment. Sediment removal to control toxic materials is possible with minimal environmental impact when proper equipment is used, but it may more than double the cost. Lack of definitive information about rooted plant regrowth rates in dredged areas prohibits explicit recommendations on sediment removal to control plant growth. 相似文献
56.
外秦淮河疏浚后底泥中多环芳烃分布特征及其变化 总被引:3,自引:2,他引:1
利用GC-MS对外秦淮河疏浚后3个月及6个月采集的13个底泥样品中16种优控多环芳烃(PAHs)进行了分析.结果表明,疏浚后3个月底泥中PAHs含量较低,疏浚后6个月PAHs含量明显上升,说明疏浚对减少水体底泥污染确实有效果,但保持时间不长,经过一段时间的沉积和富集后污染物含量会发生回复现象,外源输入和河道沉积物内源释放对疏浚后新生表层底泥PAHs含量有较大的贡献. 草场门和集庆门河段处底泥中PAHs含量较高. 底泥中的PAHs以4~6环高分子量的PAHs为主,低环PAHs所占比例春季比冬季高. 根据PAHs中特殊组分(菲/蒽和荧蒽/芘)比例(w(Phe)/w(An), w(Flu)/w(Pyr))判断外秦淮河表层底泥中的多环芳烃主要来源为石油产品燃烧. 相似文献
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洹河综合整治及其生态效益分析 总被引:4,自引:0,他引:4
阎波 《城市环境与城市生态》2000,13(4):61-62
文章对安阳市区主要地表水资源洹河的环境及生态综合整治工程进行评价,分析了其产生的环境、生态、经济和社会综合效益。 相似文献
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