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首页> 外文期刊>Environmental toxicology and chemistry >ACTIVATED CARBON AMENDMENT AS A TREATMENT FOR RESIDUAL DDT IN SEDIMENT FROM A SUPERFUND SITE IN SAN FRANCISCO BAY, RICHMOND, CALIFORNIA, USA
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ACTIVATED CARBON AMENDMENT AS A TREATMENT FOR RESIDUAL DDT IN SEDIMENT FROM A SUPERFUND SITE IN SAN FRANCISCO BAY, RICHMOND, CALIFORNIA, USA

机译：活性碳修正案，用于处理美国加利福尼亚州里士满市圣弗朗西斯科湾超级矿床中残留的滴滴涕

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Pesticide formulators formerly operating at Lauritzen Channel, a portion of San Francisco Bay near Richmond (CA, USA), caused contamination of sediment with dichlorodiphenyltrichloroethane (DDT). The present study evaluated the distribution of residual DDT in channel sediment six years following extensive remedial dredging. High DDT concentrations (up to 252 mg/kg) were found in foung Bay Mud sampled across the channel. Particle analyses showed most of the contamination is contained in the clay/silt sediment fraction, and desorption tests showed that availability is greater for DDT metabolites than parent DDT. The present study examined the feasibility of using activated carbon amendment to sequester DDT from sediment, including an evaluation of reactivated carbon as a less costly alternative to virgin activated carbons. Treatment success of activated carbon amendment to sediment collected from Lauritzen Channel was measured by reductions in aqueous equilibrium concentrations and uptake in semipermeable membrane devices (SPMDs). Four different activated carbons were tested and, after one month of treatment with 3.2 weight % carbon, DDT aqueous equilibrium concentrations were reduced up to 83% and SPMD uptake was reduced up to 91%. Reactivated carbon was comparable with virgin carbons in all tests. Reduction in SPMD uptake of DDT by treatment with 3.2% reactivated carbon increased to 99% after 26 months of treatment. The effectiveness of activated carbon was dependent on the type, size, dose, and contact time. The results show the potential usefulness of activated carbon amendment as a follow-up remedial technology for management of residuals after dredging contaminated sediment.
机译：农药配制商以前在里士满（美国加利福尼亚州）旧金山湾部分地区的Lauritzen Channel作业，造成二氯二苯基三氯乙烷（DDT）污染沉积物。本研究评估了广泛的补救性疏six后六年来，渠道沉积物中残留滴滴涕的分布情况。在整个通道的丰湾湾泥浆中发现高滴滴涕浓度（高达252 mg / kg）。颗粒分析表明，大多数污染物都包含在粘土/淤泥沉积物中，并且解吸测试表明，DDT代谢物的可利用性要比母体DDT大。本研究检验了使用活性炭改良剂从沉积物中隔离DDT的可行性，包括评估重新活化的碳作为原生活性炭的低成本替代品。通过减少水平衡浓度和吸收半透膜装置（SPMDs）来衡量活性碳改性剂对从Lauritzen渠道收集的沉积物的处理成功率。测试了四种不同的活性炭，用3.2重量％的碳处理一个月后，DDT的水平衡浓度降低至83％，SPMD吸收降低至91％。在所有测试中，再活化碳均与原始碳相当。在治疗26个月后，用3.2％的活性炭处理可减少DDT的SPMD吸收，增加到99％。活性炭的有效性取决于类型，大小，剂量和接触时间。结果表明，活性碳改良剂作为后续补救技术对疏导受污染的沉积物后残留物的管理具有潜在的实用性。

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