Removal mechanisms in aerobic slurry bioreactors for remediation of soils and sediments polluted with hydrophobic organic compounds: An overview

Pino-Herrera, Douglas O.; Péchaud, Yoan; Huguenot, David; Esposito, Giovanni; Hullebusch, Eric D. van; Oturan, Mehmet A.

doi:10.1016/j.jhazmat.2017.06.013

Cited by 60 publications

(36 citation statements)

References 119 publications

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“…By increasing the bacterial density at startup, the biodegradation rate could be enhanced somewhat, but from a break point which was 10 mL in the present study, increasing the seed size will not affect the biodegradation rate due to lack of substrate and intensive competition, which in turn, leads to a sufficient metabolism (17,18). According to literature, a successful strategy to enhance the performance of slurry bioreactors treating hydrocarbons is bioaugmentation (19). Therefore, B. kochii strain AHV-KH14 was efficient in the biodegradation of PHE with seed size of 10 mL (OD 600 = 1), corresponding to log MPN value of 5.43.…”

Section: Bioremediation Of Phe-contaminated Soilmentioning

confidence: 61%

Bioremediation of phenanthrene-polluted soil using Bacillus kochii AHV-KH14 as a halo-tolerant strain isolated from compost

Feizi

Jorfi

Takdastan

2020

Environ Health Eng Manag

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Background: Phenanthrene (PHE) is a polycyclic aromatic hydrocarbon (PAH) with crystalline structure of C14H10, which was produced from incomplete combustion of hydrocarbons and fossil fuels and can cause harmful biological effects. Bioremediation using halophilic bacteria is payed attention over chemical methods due to considerable benefits. Methods: In the present study, a halo-tolerant bacterium Bacillus kochii strain AHV-KH14 was isolated from municipal compost, and used for the bioremediation of PHE from the contaminated soil. The effects of operational parameters including soil/water ratio, initial inoculum size, PHE concentration, and salinity on the bioremediation performance were investigated. Results: A biodegradation efficiency of about to 98% was obtained for PHE concentration of 50 mg/ kg and salinity level of 1.5%. By increasing salinity content PHE concentration, PHE biodegradation rate decreased significantly. It was found that the bioremediation efficiency decreased with increasing PHE concentration. It was also revealed that for the unwashed soil sample, cumulative concentrations of different hydrocarbons played an important role in decreasing the efficiency of bioremediation. Conclusion: A natural hydrocarbon-contaminated soil sample with total petroleum hydrocarbon (TPH) concentration of 2350 mg/kg was subjected to bioremediation using the selected conditions of operational parameters, and a biodegradation rate of 17.7% was obtained.

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Section: Bioremediation Of Phe-contaminated Soilmentioning

confidence: 61%

Bioremediation of phenanthrene-polluted soil using Bacillus kochii AHV-KH14 as a halo-tolerant strain isolated from compost

Feizi

Jorfi

Takdastan

2020

Environ Health Eng Manag

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“…Though a large body of information regarding the degradability of pesticides is available from regulatory testing for market authorization, regulations stipulate testing under aerobic conditions, thus providing little insight into pesticide degradation in subsurface groundwater systems that are usually oxygen limited or anoxic (Fenner et al, 2013). Furthermore, many scientific investigations examine the biodegradation of pesticides upon application in field systems under aerobic conditions (Delgado-Moreno et al, 2017;Hoppe-Jones et al, 2012;Pinoherrera et al, 2017;Robles-González et al, 2008;Znad et al, 2010). These results cannot be translated to the array of anaerobic redox conditions encountered in subsurface systems.…”

Section: Introductionmentioning

confidence: 99%

Influence of different redox conditions and dissolved organic matter on pesticide biodegradation in simulated groundwater systems

Luo

Atashgahi

Rijnaarts

et al. 2019

Science of The Total Environment

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Insights into the influence of redox conditions, that is the availability of electron acceptors, and dissolved organic matter (DOM) on pesticide biodegradation in groundwater are key to understanding the environmental fate of pesticides in natural groundwater systems. Here, the influence of redox conditions and supplemental DOM addition on biodegradation of pesticides, 2,4-dichlorophenoxyacetic acid (2,4-D), 2,6-dichlorobenzamide (BAM), mecoprop-p (MCPP) and bentazone, was tested in microcosm and subsequent column experiments. Pesticide degradation, functional genes and changes in specific fractions and quantity of DOM were systematically quantified. In aerobic microcosm experiments, the highest 2,4-D degradation rate was obtained with the presence of more assimilable DOM. In column experiments, minimal pesticide degradation (≤33.77%) in any anaerobic redox conditions was observed in the absence of DOM. However, in the presence of DOM, 2,4-D biodegradation was considerably enhanced under nitrate-reducing conditions (from 23.5±10.2% to 82.3±11.6%) and in a column without external electron acceptor amendment (from -6.3±12.6% to 31.1±36.3%). Observed preferential depletion of the fulvic acid fraction of DOM provides indications for specific functional DOM properties.The qPCR results show an increase in microbial biomass and functional genes (tfdA) in liquid phase after DOM addition. The results of this work provide insights into the interplays among DOM, redox geochemistry, and pesticide biodegradation, and show the potential of a novel approach -DOM addition to groundwater systems -for in situ biostimulation technology to remove pesticides from groundwater systems.

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“…In comparison with these reports, our system with rotation and slurry treatment could drastically accelerate the biodegradation of oil contamination in the soil sample. There have been reports that slurry treatments are effective for bioaugmentation [6,17] and have been previously reviewed [23,33]. A rotating biological contractor (RBC) is also known as an efficient system for wastewater treatment [34].…”

Section: Discussionmentioning

confidence: 99%

A Rotational Slurry Bioreactor Accelerates Biodegradation of A-Fuel in Oil-Contaminated Soil Even under Low Temperature Conditions

et al. 2020

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An effective bioaugmentation system for oil-contaminated soil under low-temperature conditions was developed with a rotational slurry bioreactor. Mixtures of two Rhodococcus oil-degraders, strain A and C, which are officially permitted to be used in bioaugmentation in Japan, were inoculated and A-fuel oil was added to a final concentration of 2500 and 5000 mg/kg-slurry. Decomposition tests were carried out for the inoculated samples and non-inoculated samples by rotating at 15 °C, the annual average temperature of Japan. The residue of A-fuel oil and the number of bacteria were measured every two days. After 6 days of treatment, more than 95% of the oil was removed in the inoculated samples, which was more than three times faster than a previous degradation experiment without rotation. A semi-continuous treatment was performed by removing 90% of the treated slurry, then adding the same amount of contaminated slurry into the system without additional degraders. Ninety-four percent of A-fuel oil was successfully degraded after 6 days by this repeated treatment. This could drastically reduce the cost of preparing the degraders. Strikingly, semi-continuous treatment showed oil removal in the non-inoculated samples, indicating that the rotational slurry conditions could efficiently promote biodegradation by indigenous degraders. Our rotational slurry bioreactor accelerated the removal of oil contamination without adding further degraders provides an efficient and cost-effective method of removal of A-fuel oil using a semi-continuous system, which can be used in practical applications in areas with a cooler climate.

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Removal mechanisms in aerobic slurry bioreactors for remediation of soils and sediments polluted with hydrophobic organic compounds: An overview

Cited by 60 publications

References 119 publications

Bioremediation of phenanthrene-polluted soil using Bacillus kochii AHV-KH14 as a halo-tolerant strain isolated from compost

Bioremediation of phenanthrene-polluted soil using Bacillus kochii AHV-KH14 as a halo-tolerant strain isolated from compost

Influence of different redox conditions and dissolved organic matter on pesticide biodegradation in simulated groundwater systems

A Rotational Slurry Bioreactor Accelerates Biodegradation of A-Fuel in Oil-Contaminated Soil Even under Low Temperature Conditions

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