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Phytobuffering Of Lower Chlorinated Benzenes Through Willows At The Ppi Superfund Site, P. B. Jones Jr., R. R. Kommalapati, W. D. Constant
Phytobuffering Of Lower Chlorinated Benzenes Through Willows At The Ppi Superfund Site, P. B. Jones Jr., R. R. Kommalapati, W. D. Constant
Journal of Hazardous Substance Research
A series of phytobuffering bench-scale experiments using an extraction bed followed by a plant “bioreactor” was performed using streambed sediment from a nearby Superfund site. Experiments consisted of investigating the fate and transport of a mixture of lower chlorinated benzenes (monochlorobenzene, (MCB), 1,2 and 1,3- dichlorobenzene (DCB), and 1,2,4-trichlorobenzene (TCB)) at 10 – 20 ppm sediment loading. These compounds are representative of the degradation products of HCB (hexachlorobenzene) in the Baton Rouge Bayou and Devil’s Swamp area at the Petro Processors Inc. Superfund site. Fast, slow, and cyclic flow rates were used as representative conditions found during rain events in …
An Experimental Study Of Phytoremediation Of Methyl-Tert-Butyl Ether (Mtbe) In Groundwater, Q. Zhang, L. C. Davis, L. E. Erickson
An Experimental Study Of Phytoremediation Of Methyl-Tert-Butyl Ether (Mtbe) In Groundwater, Q. Zhang, L. C. Davis, L. E. Erickson
Journal of Hazardous Substance Research
The feasibility of phytoremediation of groundwater contamination with methyl-tert-butyl ether (MTBE) was examined experimentally using a six-channel soil system with or without plants. Two bacterial strains capable of degrading MTBE were each added to two out of six channels. A solution of 0.84 mM MTBE was continuously fed into each channel at 1 L/day until a stable MTBE concentration level in the groundwater was established; then the feeding was switched back to distilled water. The channel groundwater effluent MTBE concentration and the soil gas MTBE fluxes were monitored from the beginning of the MTBE solution feeding until no MTBE was …
Phytoextraction Of Metals From Contaminated Soil: A Review Of Plant/Soil/Metal Interaction And Assessment Of Pertinent Agronomic Issues, M. M. Lasat
Journal of Hazardous Substance Research
Phytoremediation is an emerging technology that employs the use of higher plants for the cleanup of contaminated environments. Fundamental and applied research have unequivocally demonstrated that selected plant species possess the genetic potential to remove, degrade, metabolize, or immobilize a wide range of contaminants. Despite this tremendous potential, phytoremediation is yet to become a commercial technology. Progress in the field is precluded by limited knowledge of basic plant remedial mechanisms. In addition, the effect of agronomic practices on these mechanisms is poorly understood. Another limitation lies within the very biological nature of this novel approach. For example, potential for phytoremediation …
Adsorption Of Toxic Metal Ions From Solution By Inactivated Cells Of Larrea Tridentata Creosote Bush, J. L. Gardea-Torresdey, A. Hernandez, K. J. Tiemann, J. Bibb, O. Rodriguez
Adsorption Of Toxic Metal Ions From Solution By Inactivated Cells Of Larrea Tridentata Creosote Bush, J. L. Gardea-Torresdey, A. Hernandez, K. J. Tiemann, J. Bibb, O. Rodriguez
Journal of Hazardous Substance Research
Larrea tridentata (creosote bush) is a plant that grows abundantly in the desert environment. This desert plant has been found naturally growing in heavy-metal contaminated soils. Previous experiments showed that the inactivated biomass of creosote bush was able to adsorb Cu(II) ions from aqueous solutions. The copper-binding capacity of the bush biomass that grows in heavy-metal uncontaminated soils was higher than the biomass that grows in heavy-metal contaminated soils. Experiments were performed to determine the ability of creosote bush biomass (grown in heavy metal uncontaminated soils) to adsorb Pb(II), Cd(II), Zn(II), Cr(III), Cr(VI), and Ni(II) ions from aqueous solutions. Batch …
Movement Of Chlorinated Solvents And Other Volatile Organics Through Plants Monitored By Fourier Transform Infrared (Ft-Ir) Spectrometry, L. C. Davis, S. Vanderhoof, J. Dana, K. Selk, K. Smith, B. Goplen, L. E. Erickson
Movement Of Chlorinated Solvents And Other Volatile Organics Through Plants Monitored By Fourier Transform Infrared (Ft-Ir) Spectrometry, L. C. Davis, S. Vanderhoof, J. Dana, K. Selk, K. Smith, B. Goplen, L. E. Erickson
Journal of Hazardous Substance Research
Plants have a large capacity to transfer water from soil to the atmosphere. Soluble contaminants may be carried with that water, with a relative extent of transfer that depends on their octanol-water or organic matter-water partition coefficient. We measured the transfer rate for several solvents that vary in volatility and solubility, including trichloro ethylene, trichloroethane, chloroform, dichloromethane, diethyl ether, and methyl-t-butyl ether. We tested them alone and in several combinations. An extractive Fourier Transform Infrared (FT-IR) Spectrometer (Gasmet, produced by Temet Instruments) was used to measure concentrations in the gas phase above plants which had their root system immersed in …
Modeling The Fate Of Toluene In A Chamber With Alfalfa Plants: 2. Numerical Results And Comparison Study, M. Narayanan, J. C. Tracy, L. C. Davis, L. E. Erickson
Modeling The Fate Of Toluene In A Chamber With Alfalfa Plants: 2. Numerical Results And Comparison Study, M. Narayanan, J. C. Tracy, L. C. Davis, L. E. Erickson
Journal of Hazardous Substance Research
Investigations were conducted in a chamber to study the role of alfalfa plants in bioremediating toluene. Modeling and experimental results indicate that in situ bioremediation of toluene in the presence of plants is feasible and economical. This is primarily due to evapotranspiration which greatly enhances the vertical transport of dissolved contaminants from the saturated zone to the rhizosphere, thereby increasing the possibility of aerobic degradation. The fate of toluene was simulated and monitored for groundwater contaminated with toluene at saturated concentrations. FT-IR instrumentation was used to monitor toluene in the headspace gas of the vegetated chamber. Overall mass balance, based …