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), and surfactant concentration were correlated for the soilwashing process using a proposed surfactantaided soilwashing model. DOI: / ASCE X 2003 7:1 .
Feb 27, 1997· HCB recoveries after 12 pore volumes of flushing with and 1% natural surfactant solutions were 20 and 100 times more than that recovered by water flooding. These promising results warrant further research to establish the usefulness of plantbased surfactants for soil washing applications.
Hydrocarbons are one of the most important soil contaminations in the world, especially in oilproducing countries. Several methods exist for the remediation of organic and hydrocarbon contaminated soils. Soil washing is one of remediation methods which could be enhanced by using different kinds of surfactants.
Mar 02, 2013· Soil Washing Remediation of Soil Artificially Contaminated with Naphthalene: Evaluation of Palm ... These methods include surfactant solubilization, solvent extraction, supercritical fluid extraction, hot water extraction, ... Solvents present in soil are often removed by flushing the soil with water followed by chemical/thermal treatment to
Extractable hydrocarbons comprised only approximately 35% of the organic carbon in the soils, and this component was considerably less affected by biological, surfactant, and oxidant treatment than organic materials that are not quantified by the TEH analysis.
Surfactant Flushing and Enhanced Remediation at a Remote Site in Northern BC Raman Birk, MSc. ... hydrocarbon contaminated soil from areas adjacent to the new and old maintenance garages (AEC * 1) and at discrete ... • Soil Washing Using IveySol – .
polycyclic aromatic hydrocarbons from mg/L to < mg/L and cyanide from mg/L to mg/L, and reagents sequestered heavy metals in the flushing solution. Keywords: soil washing, surfactant, flushing solution, ozofractionation, sequestration 1. Introduction
Soil matrices contaminated with polycyclic aromatic hydrocarbons (PAHs) abound at the sites of cokeoven gas plants, refineries, and many other major chemical industries. The removal of PAHs from soil using pure water, via soil washing for (ex situ) or soil flushing (in situ), is quite ineffective due to their low solubility and hydrophobicity.
The efficiency of soil flushing techniques may be increased with the use of surfactants. Surfactants decrease the interfacial tension between oil and water leading to the drag of contaminants in the flushing solution; also, they may interact with the soil surface, detaching the adsorbed hydrocarbon components by wettability exchange mechanisms.
This research investigates the effect of soil washing on removal of PAHs in contaminated soil. The study was conducted by collecting soil samples from a petrochemical complex in south of . Testing was carried out at three temperatures of 20°C, 40°C, and 80°C and washing periods of 30 min and 60 min.
The combination of soil washing and white rot fungus catabolization of PAH using % (w/v) Tween 80 eliminated the total PAH concentration in the contaminated soil by % (w/w) after 11 days. The results suggest that PAH‐contaminated soil may be cleansed by using a combination of surfactant soil washing and white rot fungus catabolism.
Kinetics) and related products, including the patented methods for in situ surfactant and chemical oxidation flushing (US Patent Nos.,,, 7,708,496, and 7,677,836). Our anionic surfactant formulations have the unique ability to selectively desorb and liberate sorbed petroleum hydrocarbons from soil
Soil flushing by surfactant solution: pilotscale tests of complete technology M. Šváb1, M. Kubal2 M. Kuraš2 1Dekonta,, Ustí nad Labem, Czech Republic 2Institute of Chemical Technology Prague, Czech Republic Abstract This paper relates to PCBs contaminated soil flushing process, in which the
Aug 02, 2012· Surfactants enhanced air sparging actually acts to displace the organic contaminant entrapped in soil pores. In this work, a comparison study was carried out between two airflushing modes, namely, continuous air flushing and pulsed air flushing, which was conducted to remediate soil contaminated with wastelubricant oil. Therefore, coarse sand was artificially polluted and mixed well .
Wastewater generation from the soil washing process. Wastewater was obtained by washing 700 g of hydrocarboncontaminated soil with L of the washing solution with the previously selected surfactants. The sample was agitated with a Lightnin mixer using a A310 impeller in a cylindrical acrylic container during h at
The surfactant in case of soil contaminated with the lubricant oil was able to restore properties to an extent of 98% visàvis the soil, while up to 54% cadmium was desorbed from the contaminated soil matrix in surfactant aided desorption experiments. Keywords: Contamination, Remediation, Sorption, Desorption, Surfactant, Soil Washing.
Feb 27, 1997· HCB recoveries after 12 pore volumes of flushing with and 1% natural surfactant solutions were 20 and 100 times more than that recovered by water flooding. These promising results warrant further research to establish the usefulness of plantbased surfactants for soil washing .
Surfactant solutions are being proposed for in situ flushing of organic contaminants from soils and aquifers. The feasibility of surfactant additives in remediation may depend in large part on how these chemicals affect the hydraulic conductivity of the porous media.
Jul 03, 2011· Polycyclic aromatic hydrocarbons (PAHs) and heavy metals are environmental concerns and must be removed to acceptable levels. This paper evaluates different flushing agents to enhance the remediation of soil contaminated with PAHs and heavy metals at a former manufactured gas plant site.
Surfactantenhanced soil washing/flushing technologies are still in a relatively early stage of development. However, dramatic increases (10–100 times) in the efficiency of removing organic contaminants show the potential utility of this technology ( Wilson and Clarke, 1994; West and Harwell, 1992; Chawla et al., 1991 ).
With mixed surfactants of T15S7 and SDS as 3 : 1 ratio, diesel removal was enhanced to 76% with 10 g/L of the mixed surfactants. These results could be used in the selection of proper surfactants for remediation of diesel contaminated soils. Key words : Soil washing, TPH (Total petroleum hydrocarbon), Surfactant ! "# () '' % *+, /'' . '' 0 ...
Surfactant concentrations, surfactant mixtures, soil organic content, and added solution electrolytes all affected the degree of conductivity reduction. Results indicate that surfactant‐affected hydraulic conductivity losses should be considered prior to in situ remediation and may preclude surfactant use in some fine grain soils.
Soilwashing (solvent extraction) Soilwashing is a solventextraction process. It uses the difference in the solubility of petroleum and the soil in water as the driving force. First, contaminated soils are usually excavated (although in situ soil flushing systems do exist) and the soil screened to remove large rocks and materials. If there ...
In Situ Soil Flushing A Quick Look at In Situ Soil Flushing • Injects a washing solution into unexcavated soils to flush out contaminants. • Is most effective on soils with low silt or clay content. • Requires the drilling of injection and extraction wells onsite. • Is a transportable technology that can be brought to the site.
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