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polycyclic aromatic hydrocarbons from 13.2 mg/L to <0.5 mg/L and cyanide from 5.9 mg/L to 0.02 mg/L, and reagents sequestered heavy metals in the flushing solution. Keywords: soil washing, surfactant, flushing solution, ozofractionation, sequestration 1. Introduction
A laboratory study was conducted to evaluate the contaminant removal efficiency of four soil flushing approaches (water flushing, surfactant flushing (Tween-80), bioremediation + water flushing ...
Surfactant-enhanced 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 ).
Kinetics) and related products, including the patented methods for in situ surfactant and chemical oxidation flushing (US Patent Nos. 6913419, 7021863, 7364386, 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
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.
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 ...
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 .
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
Hydrocarbons are one of the most important soil contaminations in the world, especially in oil-producing 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.
Jan 29, 2013· Soil washing is an ex-situ remediation technique that removes hazardous contaminants from soil by washing the soil with a liquid (often with a chemical additive), scrubbing the soil, and then separating the clean soils from contaminated soil and washwater (US EPA 1993, 1996). The concept of soil washing is based on the theory that contaminants .
2.4 Wastewater generation from the soil washing process. Wastewater was obtained by washing 700 g of hydrocarbon-contaminated soil with 2.1 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 2.5 h at
Soil matrices contaminated with polycyclic aromatic hydrocarbons (PAHs) abound at the sites of coke-oven 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.
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 air-flushing modes, namely, continuous air flushing and pulsed air flushing, which was conducted to remediate soil contaminated with waste-lubricant oil. Therefore, coarse sand was artificially polluted and mixed well .
The surfactant in case of soil contaminated with the lubricant oil was able to restore properties to an extent of 98% vis-à-vis 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.
Soil-washing (solvent extraction) Soil-washing is a solvent-extraction 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 ...
Feb 27, 1997· HCB recoveries after 12 pore volumes of flushing with 0.5 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 plant-based surfactants for soil washing .
In the second flushing set group is carried out on the remaining soil using 300 mL of 3% surfactant solution followed by five water washing cycles and the results are given in Table 4. The results reveal that, the percentage of removed oil was 9.96% from residual oil after first surfactant flushing run and decreased to 4.79% for next run (water ...
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.
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.
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 – .
Surfactant Flushing (TASK™) 01275 856700. In-Situ Surfactant Flushing. Cornelsen Ltd. is the authorised distributor of Tersus Advanced Surface Kinetics (TASK) surfactant and related products, including the patented methods for in-situ surfactant and chemical oxidation flushing (US Patent Nos. 6,913,419 and 7,021,863).
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.
The combination of soil washing and white rot fungus catabolization of PAH using 2.5% (w/v) Tween 80 eliminated the total PAH concentration in the contaminated soil by 56.4% (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.
Jul 06, 2004· Surfactant and soil organic matter in spent soil-washing solutions represented significant Fenton's reagent sinks, and would likely be the limiting cost factor in determining the feasibility of this method for a given soil-surfactant system.
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