Microbial Decontamination of Polluted Soil in a Slurry Process

Geerdink, M. J.; Kleijntjens, R. H.; Loosdrecht, M.C.M. van; Luyben, K. Ch. A. M.

doi:10.1061/(asce)0733-9372(1996)122:11(975)

Cited by 13 publications

(4 citation statements)

References 18 publications

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“…However, the biodegradation rate of oil on the fine fraction of soil is lower than that on the larger fraction in SPB (Bhadari et al, 1994). Geerdink et al (1996) reported that reducing the concentration of diesel oil in soil with high clay and silt contents from 17 g kg -soil -1 to 0.05 g kg -soil -1 took more than 10 weeks in an SPB. Therefore, technologies for accelerating the degradation of oils on fine soils in SPBs must be developed.…”

Section: Introductionmentioning

confidence: 99%

Enhancement of biodegradation of oil adsorbed on fine soils in a bioslurry reactor

et al. 2007

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Techniques for enhancing the biodegradation of oil-contaminated fine soils in a slurry-phase bioreactor were investigated. Using a model system consisting of kaolin particles containing adsorbed n-dodecane as a diesel fuel surrogate, we investigated how increasing the temperature and adding a surfactant and various hydrophobic support media affected the biodegradation rate of n-dodecane. Increasing the temperature from 25 to 35 degrees C decreased the time required for complete degradation of n-dodecane by 30%, from 110h to 80h. Addition of the surfactant polyethylene glycol p-1,1,3,3-tetramethylbutylphenyl ether decreased the degradation time to less than 48h at 35 degrees C, although a high concentration of the surfactant (3000mgl(-1)) was required. We suspect that the surfactant increased the degradation rate by solubilizing the n-dodecane into the solution phase in which the microorganisms were suspended. We tested five types of organic polymers as support media for the microorganisms and found that the biodegradation time could be reduced by approximately 50% with a support medium made from polyurethane; in the presence of this medium, only 36h was required for complete decomposition at 35 degrees C. The reduction in the degradation time was probably due to transfer of the n-dodecane from the soil to the support medium, which improved contact between the n-dodecane and the microorganisms. The polyurethane support medium bearing the microorganisms was stable and could be reused.

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Section: Introductionmentioning

confidence: 99%

Enhancement of biodegradation of oil adsorbed on fine soils in a bioslurry reactor

et al. 2007

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“…Several reports have showed that straight-chain alkanes have often been found to be readily degraded in field and laboratory studies, by a large diversity of bacteria (De Jong et al, 1997). The most evidenced mechanism to describe the straight-chain alkanes biodegradation is the terminal oxidation which leads to the conversion of hydrocarbons into the corresponding more stable compounds, following the sequence of oxidation of the terminal carbon, from the more reduced to the more oxidized compound, such as alcohols, aldehydes, carboxylic acids and fat acids (Alexander, 1994;Atlas 1984;Glazer and Nikaido, 1995;Seeger et al, 1997). Although it is generally true that branched alkanes are more recalcitrant than their equivalent straight-chain alkanes, studies have demonstrated that many of these branched compounds were more degradable than they have previously been reported (Geerdink et al, 1996).…”

Section: Biodegradationmentioning

confidence: 99%

Biodegradation of stored jet fuel by a Nocardia sp. isolated from contaminated soil

Gomes

Soriano

Miranda

et al. 2009

Braz. arch. biol. technol.

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“…Residence time is approximately 100 hours, which means that the degradation time is 70 times faster than that of landfarming [2] . Geerdink et al [62] found that after treatment in a DITS reactor, oil was slowly released from the contaminated soil and treatment by another method was required for a further 10 weeks to reach minimal contamination levels.…”

Section: Dual Injection Turbulent Suspension Reactorsmentioning

confidence: 99%

Assessment of Canadian Regulations and Remediation Methods for Diesel Oil Contaminated Soils

Rushton¹,

Ghaly²,

Martinell³

2007

American J. of Applied Sciences

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Diesel fuel released into the environment can contaminate ground water, degrade potable water supplies and cause the collapse of fisheries. They are toxic to both animals and humans and can affect the liver, lungs, kidneys, and nervous system leading to cancer as well as immunological and reproductive effects. The objectives of this study were to review current Canadian regulations pertaining to diesel fuel and to evaluate the current remediation methods using five criteria: efficiency, applicability, cost, time and cleanliness. PAHs are deemed toxic under the Canadian Environmental Protection Act but no standards have been set for PAHs in diesel. The Canadian Council of Ministers of the Environment (CCME) has developed Canada-Wide Standards for Petroleum Hydrocarbons in Soil (CWS PHCS) while the Atlantic PIRI has implemented a Risk Based Corrective Action (RBCA) for the Atlantic region. The remediation methods included soil washing, landfilling, incineration, thermal desorption, radio frequency heating, chemical addition, landfarming, biopiling, composting, bioventing, liquid delivery and bioreactors. The bioreactors studied included: static bed, continuous mix, horizontal drum, fungal compost, slurry-phase, DITS, biofilters and packed bed bioreactors. The results showed that the biological methods were more effective than nonbiological ones and the bioreactors scored the highest among the biological methods. Eight criteria were then used for the evaluation of bioreactors: efficiency, time, cost, maintenance, simplicity, release of VOCs to the atmosphere, containment of contaminants and control of operating parameters The results showed that the continuous mix bioreactor was the most effective system

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Microbial Decontamination of Polluted Soil in a Slurry Process

Cited by 13 publications

References 18 publications

Enhancement of biodegradation of oil adsorbed on fine soils in a bioslurry reactor

Enhancement of biodegradation of oil adsorbed on fine soils in a bioslurry reactor

Biodegradation of stored jet fuel by a Nocardia sp. isolated from contaminated soil

Assessment of Canadian Regulations and Remediation Methods for Diesel Oil Contaminated Soils

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