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Aqueous monitoring of activated carb...
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Tomaszewski, Jeanne Elizabeth.
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Aqueous monitoring of activated carbon amendment of sediments in the laboratory and field.
紀錄類型:
書目-語言資料,印刷品 : Monograph/item
正題名/作者:
Aqueous monitoring of activated carbon amendment of sediments in the laboratory and field./
作者:
Tomaszewski, Jeanne Elizabeth.
面頁冊數:
114 p.
附註:
Adviser: Richard Luthy.
Contained By:
Dissertation Abstracts International69-02B.
標題:
Engineering, Environmental. -
電子資源:
http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3302881
ISBN:
9780549489306
Aqueous monitoring of activated carbon amendment of sediments in the laboratory and field.
Tomaszewski, Jeanne Elizabeth.
Aqueous monitoring of activated carbon amendment of sediments in the laboratory and field.
- 114 p.
Adviser: Richard Luthy.
Thesis (Ph.D.)--Stanford University, 2008.
This research advances the remedial technology of activated carbon amendment of sediments by testing the technology on dredged sediment contaminated with dichlorodiphenyltrichloroethane (DDT) and validating the use of polyethylene passive samplers (PEDs) as a new rapid measure of sediment pore water concentrations in the field. Activated carbon amendment is a promising emerging technology for sediment contaminated with hydrophobic organic chemicals, which are well known for their persistence and bioaccumulation. A feasibility study using sediment from a DDT-contaminated Superfund site six years after extensive remedial dredging (Lauritzen Channel, Richmond, CA), measures the effectiveness of activated carbon amendment by reductions in aqueous equilibrium concentrations and uptake in semipermeable membrane devices (SPMDs). Tests with four different activated carbons show, after one month of treatment with 3.2 weight% carbon, DDT aqueous equilibrium concentrations reduce up to 83% and SPMD uptake reduces up to 91%. Reduction in SPMD uptake of DDT by treatment with 3.2 weight% reactivated carbon increases to 99% after twenty-six months of treatment. Notably, this work introduces reactivated carbon as an effective and cheaper amendment alternative to virgin carbon. Twenty-eight day bioaccumulation studies with Mytilus edulis show accumulated DDT in mussel tissue decreases 91% and 84% for virgin and reactivated carbons, respectively, as compared to untreated sediment from Lauritzen Channel. Concentrations in SPMDs and PEDs correlate to mussel tissue concentrations, showing that passive sampler uptake adequately reflects changes in available DDT in the water column. A biodynamic model that incorporates DDT water concentrations, either analytically measured or estimated from PED uptake, accurately predicts mussel accumulation over time. Sediment pore water concentrations of polychlorinated biphenyls (PCBs) in a contaminated mudflat in San Francisco Bay, CA were determined by field-deployed PEDs. The modeling approach involves the use of impregnated performance reference compounds and interpretation of the data either by molar volume adjustment or environmental adjustment factors to measure pore water concentrations of 118 PCB congeners. Eighteen months after treatment, a 60% decrease in PCB concentrations was measured, as compared to a mechanically-mixed control plot. In total, this work advances the aqueous monitoring of the effectiveness of activated carbon amendment.
ISBN: 9780549489306Subjects--Topical Terms:
783782
Engineering, Environmental.
Aqueous monitoring of activated carbon amendment of sediments in the laboratory and field.
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This research advances the remedial technology of activated carbon amendment of sediments by testing the technology on dredged sediment contaminated with dichlorodiphenyltrichloroethane (DDT) and validating the use of polyethylene passive samplers (PEDs) as a new rapid measure of sediment pore water concentrations in the field. Activated carbon amendment is a promising emerging technology for sediment contaminated with hydrophobic organic chemicals, which are well known for their persistence and bioaccumulation. A feasibility study using sediment from a DDT-contaminated Superfund site six years after extensive remedial dredging (Lauritzen Channel, Richmond, CA), measures the effectiveness of activated carbon amendment by reductions in aqueous equilibrium concentrations and uptake in semipermeable membrane devices (SPMDs). Tests with four different activated carbons show, after one month of treatment with 3.2 weight% carbon, DDT aqueous equilibrium concentrations reduce up to 83% and SPMD uptake reduces up to 91%. Reduction in SPMD uptake of DDT by treatment with 3.2 weight% reactivated carbon increases to 99% after twenty-six months of treatment. Notably, this work introduces reactivated carbon as an effective and cheaper amendment alternative to virgin carbon. Twenty-eight day bioaccumulation studies with Mytilus edulis show accumulated DDT in mussel tissue decreases 91% and 84% for virgin and reactivated carbons, respectively, as compared to untreated sediment from Lauritzen Channel. Concentrations in SPMDs and PEDs correlate to mussel tissue concentrations, showing that passive sampler uptake adequately reflects changes in available DDT in the water column. A biodynamic model that incorporates DDT water concentrations, either analytically measured or estimated from PED uptake, accurately predicts mussel accumulation over time. Sediment pore water concentrations of polychlorinated biphenyls (PCBs) in a contaminated mudflat in San Francisco Bay, CA were determined by field-deployed PEDs. The modeling approach involves the use of impregnated performance reference compounds and interpretation of the data either by molar volume adjustment or environmental adjustment factors to measure pore water concentrations of 118 PCB congeners. Eighteen months after treatment, a 60% decrease in PCB concentrations was measured, as compared to a mechanically-mixed control plot. In total, this work advances the aqueous monitoring of the effectiveness of activated carbon amendment.
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