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首页> 外文会议>Western Dredging Association Twenty-Second Technical Conference, Thirty-Fourth Texas Aamp;M Dredging Seminar, and Special Permanent International Association of Navigational Congresses Session, Jun 12-15, 2002, Denver, Colorado >Dredging PCB-Contaminated Sediment from the St. Lawrence River: Project Overview
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Dredging PCB-Contaminated Sediment from the St. Lawrence River: Project Overview

机译：从圣劳伦斯河疏PCB多氯联苯污染的沉积物：项目概述

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An environmental dredging project was completed on the St. Lawrence River near Massena, New York between April and December 2001. The project entailed the dredging of PCB-contaminated sediments from an area of 12 hectares (30 acres), in water depths up to 8.2 m (27 ft), adjacent to the main shipping channel for the St. Lawrence Seaway. A 1,160 m (3,800 ft) long sheet pile wall was installed to isolate the remediation area from the river. Inside the sheet pile wall, a 366 m (1,200 ft) long silt curtain was erected to isolate the more highly contaminated areas. Air gates allowed barge access into the area enclosed by the silt curtain. Three derrick barges were used as dredges, each with a lattice-boom conventional crane. The cranes were outfitted with Cable Arm? environmental buckets and the WINOPS dredge positioning system. Five material barges with filter bed dewatering systems were used as scows. The scows were unloaded at a specially constructed dock facility and placed in trucks for transport to sediment dewatering and storage pens or the onsite landfill. The dredge area was divided into 268 cells, each with a specified target depth of excavation. After each dredge pass, sediment samples were collected and tested for PCBs. Additional dredge passes were completed as needed to attain the cleanup goal of 1 ppm PCBs. Onshore sediment handling entailed the unloading and stockpiling of sediment containing ≥50 ppm PCBs for characterization and disposal. Sediments with <50 ppm PCBs were taken directly to the onsite landfill; sediments with ≥50 ppm PCBs were shipped offsite. All sediments were stabilized with Portland cement to allow for offsite transport or placement in the onsite landfill. A total of 65,500 m~3 of sediment containing 9,180 kg was eventually removed from the river. Approximately two-thirds (177) of the 268 dredge cells were successfully remediated to less than 1 ppm PCBs; 39 more were remediated to less than 2 ppm. Fifteen cells were covered with an interim cap consisting of 30.5 cm of gravel. Follow-on work is planned for 2002 to complete the capping activities.
机译：2001年4月至12月，在纽约马塞纳附近的圣劳伦斯河上完成了一项环境疏project项目。该项目涉及疏from 12公顷（30英亩）面积，水深达8.2的多氯联苯污染的沉积物。米（27英尺），毗邻圣劳伦斯海道的主要航运通道。安装了1,160 m（3,800 ft）长的板桩墙，以将整治区与河流隔离开。在板桩墙的内部，竖立了366 m（1,200 ft）长的淤泥幕，以隔离污染程度更高的区域。气闸允许驳船进入淤泥幕所包围的区域。使用三台井架驳船作为挖泥机，​​每台都配有一台格构臂式常规起重机。起重机配备了电缆臂？环保桶和WINOPS挖泥机定位系统。五台带有过滤床脱水系统的物料驳船被用作犁头。这些粪便在专门建造的码头设施中卸货，然后放在卡车中运输到沉淀物脱水和储存笔或现场垃圾填埋场。疏edge区被分成268个单元，每个单元都有指定的目标挖掘深度。每次疏通之后，都要收集沉积物样品并进行多氯联苯检测。根据需要完成了额外的挖泥机通过，以达到1 ppm PCB的清理目标。陆上沉积物处理需要卸除和储存含有≥50ppm PCB的沉积物，以进行表征和处理。多氯联苯含量＜50 ppm的沉积物直接被带到现场填埋场；多氯联苯含量≥50ppm的沉积物被运到异地。所有沉积物均用波特兰水泥稳定，以允许非现场运输或放置在现场垃圾填埋场中。最终从河中清除了总计65,500 m〜3的含9,180 kg的沉积物。 268个疏通池中约有三分之二（177）被成功修复到少于1 ppm的PCB上。另有39例被修复至不足2 ppm。用由30.5厘米的砾石组成的中间盖覆盖15个单元。计划在2002年进行后续工作以完成封顶活动。

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