Supercritical Fluid Extraction of Organic Pollutants from Soil Combined with Adsorption Onto Activated Carbon PDF Download

Author: Giridhar Madras
Publisher:
ISBN:
Category :
Languages : en
Pages : 260

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Author: Vernon L. Snoeyink
Publisher:
ISBN:
Category : Carbon, Activated
Languages : en
Pages : 130

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Author: Richard A. Dobbs
Publisher:
ISBN:
Category : Adsorption
Languages : en
Pages : 336

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Author: Ahmed Belasri
Publisher: Springer Nature
ISBN: 9811554447
Category : Technology & Engineering
Languages : en
Pages : 659

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This book highlights peer reviewed articles from the 1st International Conference on Renewable Energy and Energy Conversion, ICREEC 2019, held at Oran in Algeria. It presents recent advances, brings together researchers and professionals in the area and presents a platform to exchange ideas and establish opportunities for a sustainable future. Topics covered in this proceedings, but not limited to, are photovoltaic systems, bioenergy, laser and plasma technology, fluid and flow for energy, software for energy and impact of energy on the environment.

Author: Charles A. Eckert
Publisher:
ISBN:
Category : Technology & Engineering
Languages : en
Pages : 52

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One technology for environmental control and waste remediation which has great potential is contaminant removal and separation with supercritical fluids (SCFs) or supercritical fluid extraction. In order to take advantage of this technology, both a fundamental understanding of phase equilibria and applicable engineering design data are required. This report documents an extensive study into both aspects culminating in the design and economic evaluation of an SCF regeneration process for granular activated carbon. Results include: solubility of model compounds, cosolvent effects on solubility, vapor pressure measurements, spectroscopic measurements, and models for SCF phase equilibria. Charts, tables and graphs.

Author: Robert W. Coughlin
Publisher:
ISBN:
Category : Adsorption
Languages : en
Pages : 42

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Author: Christopher P. Eppig
Publisher:
ISBN:
Category : Carbon, Activated
Languages : en
Pages : 100

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Author: Ferhan Cecen
Publisher: John Wiley & Sons
ISBN: 3527639454
Category : Science
Languages : en
Pages : 409

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Book Description
This monograph provides comprehensive coverage of technologies which integrate adsorption and biological processes in water and wastewater treatment. The authors provide both an introduction to the topic as well as a detailed discussion of theoretical and practical considerations. After a review of the basics involved in the chemistry, biology and technology of integrated adsorption and biological removal, they discuss the setup of pilot- and full-scale treatment facilities, covering powdered as well as granular activated carbon. They elucidate the factors that influence the successful operation of integrated systems. Their discussion on integrated systems expands from the effects of environmental to the removal of various pollutants, to regeneration of activated carbon, and to the analysis of such systems in mathematical terms. The authors conclude with a look at future needs for research and develoment. A truly valuable resource for environmental engineers, environmental and water chemists, as well as professionals working in water and wastewater treatment.

Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 21

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The Energy & Environmental Research Center (EERC) has demonstrated that controlling the temperature (and to a lesser extent, the pressure) of water can dramatically change its ability to extract organics and inorganics from matrices ranging from soils and sediments to waste sludges and coal. The dielectric constant of water can be changed from about 80 (a very polar solvent) to & lt;5 (similar to a nonpolar organic solvent) by controlling the temperature (from ambient to about 400 C) and pressure (from about 5 to 350 bar). The EERC has shown that hazardous organic pollutants such as pesticides, PACS (polycyclic aromatic hydrocarbons), and PCBs (polychlorinated biphenyls) can be completely removed from soils, sludges, and sediments at temperatures (250 C) and pressures (50 atm) that are much milder than typically used for supercritical water processes (temperature374 C, pressure>221 atm). In addition, the process has been demonstrated to be particularly effective for samples containing very high levels of contaminants (e.g., part per thousand). Current projects include demonstrating the subcritical water remediation process at the pilot scale using an 8-liter system constructed under separate funding during 1997. To date, subcritical water has been shown to be an effective extraction fluid for removing a variety of organic pollutants from soils and sludges contaminated with fossil fuel products and waste products, including PACS from soil (e.g., town gas sites), refining catalysts, and petroleum tank bottom sludges; PCBs from soil and sediments; toxic gasoline components (e.g., benzene) from soil and waste sludge; and phenols from petroleum refinery sludges. The obvious need to clean the wastewater from subcritical water processes led to preliminary experiments with activated carbon placed in line after the extractor. Initial experiments were performed before and after cooling the extractant water (e.g., with water at 200 C and with water cooled to 25 C). Surprisingly, the ability of activated carbon to remove organics from the water is better at a high temperature than at room temperature. These initial results are opposite to those expected from chromatographic theory, since the solubility of the organics is about 100,000-fold higher in the hot water than in ambient water. At present, the physicochemical mechanism accounting for these results is unknown; however, it is possible that the lower surface tension and lower viscosity of subcritical water (compared to water at ambient conditions) greatly increases the available area of the carbon by several orders of magnitude. Regardless of the mechanism involved, the optimal use of activated carbon to clean the wastewater generated from subcritical water remediation will depend on obtaining a better understanding of the controlling parameters. While these investigations focused on the cleanup of wastewater generated from subcritical water remediation, the results also apply to cleanup of any wastewater contaminated with nonpolar and moderately polar organics such as wastewaters from coal and petroleum processing.

Author: Christopher Vanier
Publisher:
ISBN:
Category : Carbon, Activated
Languages : en
Pages : 104

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