Mass transfer limitation in PAH-contaminated soil remediation

1998 ◽  
Vol 37 (8) ◽  
pp. 111-118 ◽  
Author(s):  
Ick-Tae Yeom ◽  
Mriganka M. Ghosh
Keyword(s):  
Mass Transfer ◽  
Contaminated Soil ◽  
Contaminated Soils ◽  
Polynuclear Aromatic Hydrocarbons ◽  
Batch Experiments ◽  
Mass Transfer Limitation ◽  
Manufactured Gas Plant ◽  
Different Types ◽  
14Co2 Production ◽  
Triton X

Batch experiments were conducted to determine the effects of Triton X-100, a nonionic phenolic ethoxylate surfactant, on the biodegradation of soil-bound naphthalene and phenanthrene. Two different types of soils, one contaminated with polynuclear aromatic hydrocarbons (PAHs) for different lengths of time, 2 days to 10 months, in the laboratory and the other, a field-contaminated soil from a manufactured gas plant (MGP) site, were used. Biodegradation of PAHs was measured by monitoring the 14CO2 production for the artificially contaminated soils and the residual PAHs in soil phase for the MGP soil. Without adding surfactant, the mineralization rate of phenanthrene was significantly smaller in the 1 0-month contaminated soil compared to that in the 2-day contaminated soil. Presumably, mineralization was mass-transfer limited in the soil with longer contamination period. Triton X-100 significantly enhanced mineralization in the 10 month-old soil but none in the 2-day old soil. The MGP soil, weathered over 2-3 decades, exhibited even greater enhancement of mineralization. Mineralization of PAHs in aged soils appears to be controlled by mass transfer rather than the rate of biodegradation. Surfactants increase the rate of release of soil-bound contaminant and thus help promote biodegradation.

Studies Estimating the Dermal Bioavailability of Polynuclear Aromatic Hydrocarbons from Manufactured Gas Plant Tar-Contaminated Soils

1998 ◽  
Vol 32 (20) ◽  
pp. 3113-3117 ◽  
Author(s):  
Timothy A. Roy ◽  
Andrew J. Krueger ◽  
Barbara B. Taylor ◽  
David M. Mauro ◽  
Lawrence S. Goldstein
Keyword(s):  
Aromatic Hydrocarbons ◽  
Contaminated Soils ◽  
Polynuclear Aromatic Hydrocarbons ◽  
Manufactured Gas Plant

scholarly journals Remediation of Aviation Kerosene-Contaminated Soil by Sophorolipids from Candida bombicola CB 2107

2020 ◽  
Vol 10 (6) ◽  
pp. 1981
Author(s):  
Torsha Goswami ◽  
Filip M. G. Tack ◽  
Lenka McGachy ◽  
Marek Šír
Keyword(s):  
Contaminated Soil ◽  
Contaminated Soils ◽  
Carbon Sources ◽  
Synthetic Surfactant ◽  
Contaminant Removal ◽  
Candida Bombicola ◽  
And Performance ◽  
Growing Conditions ◽  
Triton X ◽  
Synthetic Surfactants

Yeast-derived biosurfactants may substitute or complement chemical surfactants as green reagents to extract petroleum hydrocarbons from contaminated soil. The effectiveness of contaminant clean-up by sophorolipids was tested on kerosene-contaminated soil with reference to traditional synthetic surfactants. The sophorolipids produced by the yeast Candida bombicola CB 2107, cultivated with the carbon sources 10 g/L glucose and 10 g/L rapeseed oil, were most effective in contaminant removal. This biosurfactant revealed a critical micelle concentration of 108 mg/L which was close to that of Triton X-100 (103 mg/L), the synthetic surfactant considered as reference. It outperformed Triton X-100 in reducing kerosene concentrations (C10–C40) in contaminated soils. In a soil initially containing 1080 mg/kg of C10–C40, the concentration was reduced to 350 mg/kg using the biosurfactant, and to 670 mg/kg using Triton-X. In the soil with initial concentration of 472 mg/kg, concentrations were reduced to 285 and 300 mg/kg for biosurfactant and Triton X-100, respectively. Sophorolipids have the potential to replace synthetic surfactants. Properties and performance of the biosurfactants, however, strongly differ depending on the yeast and the growing conditions during production.

Effects of Three Salts to Oilseed Rape (Brassica napus) Accumulating Cadmium in Cd-Contaminated Soil

2011 ◽  
Vol 356-360 ◽  
pp. 63-69
Author(s):  
Liang Peng Yi ◽  
Zu Wei Wang
Keyword(s):  
Sodium Chloride ◽  
Brassica Napus ◽  
Sodium Carbonate ◽  
Contaminated Soil ◽  
Contaminated Soils ◽  
Sodium Sulfate ◽  
Cadmium Accumulation ◽  
Saline Soils ◽  
High Concentration ◽  
Different Types

In order to use the Cd-contaminated saline soil, experiments have been carried out to analyze the differences among effects of three salts on cadmium accumulation capacities of Brassica Napus in Cd-contaminated soil, thus to figure out the phytoremediation effects of planting Brassica Napus in different types of Cd-contaminated saline soils. Brassica Napus(a cadmium hyperaccumulator plant) has been as the research plant, the Brassica Napus was planted in Cd-contaminated soils (Cd: 10 mg•kg-1) with different salt concentrations(0 g•kg-1, 2g•kg-1,4 g•kg-1 and 6 g•kg-1) for 60 days as required by the greenhouse pot soil culture experiment, thus to study the bioconcentration factor(BCF) of Brassica Napus on Cd and the effects of Brassica Napus on the changes of concentrations in the shoots and roots. The three main salts in the soil, namely, sodium chloride, sodium sulfate and sodium carbonate, were chosen as the analysis and research objects. The results showed that the soil containing sodium carbonate inhibited the Brassica Napus from absorbing Cd in the soil, so did the soil containing sodium sulfate, however, the effect was not so obvious as that of the soil containing sodium carbonate. However, the soil containing sodium chloride had little impact on Cd absorption of the Brassica Napus that it could only slightly promote the cadmium accumulation capacities of Brassica Napus under a very high concentration, In different types of saline soils, there were significant differences among the effects of different salts on cadmium accumulation capacities of Brassica Napus, the sodium chloride in the soil had little impact on cadmium accumulation capacities of the roots of Brassica Napus, however, it could enhance the cadmium accumulation capacities of the shoots of Brassica Napus; the sodium carbonate in the soil could significantly inhibit the shoots and roots of Brassica Napus from accumulating the cadmium, therefore, it was not conducive for the Brassica Napus to accumulate cadmium.

scholarly journals Biochar application to metal-contaminated soil: Evaluating of Cd, Cu, Pb and Zn sorption behavior using single- and multi-element sorption experiment

2011 ◽  
Vol 57 (No. 8) ◽  
pp. 372-380 ◽  
Author(s):  
L. Trakal ◽  
M. Komárek ◽  
J. Száková ◽  
V. Zemanová ◽  
P. Tlustoš
Keyword(s):  
Contaminated Soil ◽  
Contaminated Soils ◽  
Organic Material ◽  
Application Rate ◽  
Sorption Behavior ◽  
Competition Effect ◽  
Sorption Experiment ◽  
Application Rates ◽  
Metal Immobilization ◽  
Different Types

The aim of this study was to evaluate metals (Cd, Cu, Pb and Zn) sorption behavior after biochar application into a metal-contaminated soil. Additionally, two different types of biochar originated from the same organic material (contaminated and uncontaminated) at different application rates (1% and 2% w/w) were evaluated as a novelty of the experiment. Batch sorption/desorption experiments were established to compare the sorption behavior of metals originating from single- and multi-element solutions. Zinc as one of the main contaminants in the studied soil was easily desorbed in the presence of Cu, Pb and to a lesser extent by Cd. This desorption was reduced after biochar application. The obtained results proved the different sorption behavior of metals in the single-metal solution compared to the multi-metal ones due to competition effect. Moreover, during multi-element sorption, Zn was significantly desorbed. The applied biochar enhanced Cu and Pb sorption and no changes were observed when contaminated and uncontaminated biochar was used. Furthermore, the application rate (1% and 2% w/w) had no effect as well. In summary, it is needed to point out that the applied rates of biochars were insufficient for metal immobilization in such contaminated soils.

scholarly journals Genome Sequence of Acinetobacter lactucae OTEC-02, Isolated from Hydrocarbon-Contaminated Soil

2017 ◽  
Vol 5 (21) ◽  
Author(s):  
Marco Antonio Rogel-Hernandez ◽  
Gabriela Guerrero ◽  
Clara Ivette Rincón-Molina ◽  
Víctor Manuel Ruiz-Valdiviezo ◽  
Crhistian Cisneros-Pérez ◽  
...  
Keyword(s):  
Sequence Analysis ◽  
Genome Sequence ◽  
Contaminated Soil ◽  
Contaminated Soils ◽  
Whole Genome Sequence ◽  
Whole Genome ◽  
Genome Sequence Analysis ◽  
Content Type ◽  
Different Types ◽  
Monoaromatic Hydrocarbons

ABSTRACT Acinetobacter lactucae OTEC-02 was isolated from hydrocarbon-contaminated soils. Whole-genome sequence analysis was performed to learn more about the strain’s ability to degrade different types of recalcitrant toxic monoaromatic hydrocarbons. The genome of this bacterium revealed its genomic properties and versatile metabolic features, as well as a complete prophage.

Release of contaminant U(VI) from soils

2005 ◽  
Vol 93 (4) ◽  
Author(s):  
Zuoping Zheng ◽  
Jiamin Wan
Keyword(s):  
Ionic Strength ◽  
Contaminated Soil ◽  
Contaminated Soils ◽  
Mass Ratio ◽  
Solid Mass ◽  
Batch Experiments ◽  
Release Rates ◽  
Oak Ridge ◽  
Solution Volume

SummaryThe retention, mobility, and bio-availability of U(VI) in contaminated soils depend strongly on release of U(VI). Laboratory batch experiments were performed to evaluate the factors (ionic strength of the extraction solution and solution volume to solid mass ratio) controlling the release of U(VI) from contaminated soil at Oak Ridge, Tennessee. Increase in ionic strength shows an evident effect on U(VI) release as indicated by the increase in release rates and associated release mass of U(VI). The ratio of solution volume to solid mass (

scholarly journals Aided Phytostabilization of Copper Contaminated Soils with L. Perenne and Mineral Sorbents as Soil Amendments

2017 ◽  
Vol 26 (3) ◽  
pp. 79-89 ◽  
Author(s):  
Maja Radziemska
Keyword(s):  
Trace Elements ◽  
Lolium Perenne ◽  
Contaminated Soil ◽  
Contaminated Soils ◽  
Above Ground Biomass ◽  
Lolium Perenne L ◽  
Different Types ◽  
Potential Risks ◽  
Copper Contaminated ◽  
Potential Use

Abstract The present study was designed to assess phytostabilization strategies for the treatment of soil co-contaminated by increasing levels of copper with the application mineral amendments (chalcedonite, zeolite, dolomite). From the results it will be possible to further elucidate the benefits or potential risks derived from the application of different types of mineral amendments in the remediation of a copper contaminated soil. A glasshouse pot experiment was designed to evaluate the potential use of different amendments as immobilizing agents in the aided phytostabilization of Cu-contaminated soil using ryegrass (Lolium perenne L.). The content of trace elements in plants and total in soil, were determined using the method of spectrophotometry. All of the investigated element contents in the tested parts of L. perenne were significantly different in the case of applying mineral amendments to the soil, as well as increasing concentrations of copper. The greatest average above-ground biomass was observed for soil amended with chalcedonite. In this experiment, all analyzed metals accumulated predominantly in the roots of the tested plant. In general, applying mineral amendments to soil contributed to decreased levels of copper concentrations.

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