Input of organic matter enhances degradation of weathered diesel fuel in sub-tropical sediments

Horel, Ágota; Mortazavi, Behzad; Sobecky, Patricia A.

doi:10.1016/j.scitotenv.2015.06.102

Cited by 29 publications

(14 citation statements)

References 48 publications

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“…In the present study, the uncontaminated soil at the beginning of the experiment had a total petroleum hydrocarbon (TPH) degrader microbial density between 1.81×10 3 and 3.62×10 4 per g soil. This number is similar to other studies completed in warmer environments, such as in sediments in the Gulf of Mexico (Horel et al 2015a). However even in cold environments, a high microbial density can be be observed.…”

Section: Durations Of Growth Phases and Corresponding Rate Constantssupporting

confidence: 91%

Impact of VOC removal by activated carbon on biodegradation rates of diesel, Syntroleum and biodiesel in contaminated sand

Horel

Schiewer

2016

Science of The Total Environment

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The degradation of conventional diesel (D), synthetic diesel (Syntroleum), and pure fish biodiesel (B100) by indigenous microbes was investigated in laboratory microcosms containing contaminated sand. The fate of volatiles and the influence of volatilization on degradation rates were examined by placing activated carbon (AC) in microcosm headspaces to sorb volatiles. Three AC regimes were compared: no activated carbon (NAC), regular weekly AC change (RAC), and frequent AC change (FAC), where the frequency of activated carbon exchange declined from daily to weekly. Generally, the alternative fuels were biodegraded faster than diesel fuel. Hydrocarbon mineralization percentages for the different fuel types over 28days were between 23% (D) and 48% (B100) in the absence of activated carbon, decreased to 12% (D) - 37% (B100) with weekly AC exchange, and were further reduced to 9-22% for more frequent AC change. Sorption of volatiles to AC lowered their availability as a substrate for microbes, reducing respiration. Volatilization was negligible for the biodiesel. A mass balance for the carbon initially present as hydrocarbons in microcosms with activated carbon in the head space was on average 92% closed, with 45-70% remaining in the soil after 4weeks, 9-37% mineralized and up to 12% volatilized. Based on nutrient consumption, up to 29% of the contaminants were likely converted into biomass.

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Section: Durations Of Growth Phases and Corresponding Rate Constantssupporting

confidence: 91%

Impact of VOC removal by activated carbon on biodegradation rates of diesel, Syntroleum and biodiesel in contaminated sand

Horel

Schiewer

2016

Science of The Total Environment

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“…Microbulbifer spp. belong to the aerobic sulfate-reducing bacteria, which have been shown to be dominant carbohydrate degraders in sandy sediments [49]. OTUs assigned to Methylocaldum have been reported to possess the pmoA gene involved in methane oxidation [50].…”

Section: Differential Taxa For Cultivation Systemsmentioning

confidence: 99%

Organic Farming Improves Soil Microbial Abundance and Diversity under Greenhouse Condition: A Case Study in Shanghai (Eastern China)

2018

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Agricultural practices have significant impacts on soil properties and microbial communities; however, little is known about their responses to open field and plastic tunnels under organic and conventional farming. We therefore investigated the responses of soil chemical variables and microbial communities to different agricultural management and cultivation types, including organic management in open field (OF), organic management in plastic tunnels (OP), conventional management in open field (CF) and conventional management in plastic tunnels (CP), by using a pyrosequencing approach of 16S rRNA gene amplicon. Both factors had significant influences on the soil properties and microbial communities. Organic farming increased the nutrient-related soil variables compared to conventional farming regardless of cultivation type, especially for the available N and P, which were increased by 137% and 711%, respectively, in OP compared to CP. Additionally, OP had the highest microbial abundance and diversity among treatments, whereas no difference was found between OF, CF and CP. Furthermore, OP possessed diverse differential bacteria which were mainly related to the organic material turnover (e.g., Roseiflexus, Planctomyces and Butyrivibrio) and plant growth promotion (e.g., Nostoc, Glycomyces and Bacillus). Redundancy analysis (RDA) showed that pH, electrical conductivity (EC), nutrient levels (e.g., available N and available P) and total Zn content were significantly correlated to the structure of the microbial community. Overall, our results showed that the long-term organic farming with high fertilizer input increased soil nutrient levels and microbial abundance and diversity under plastic-tunnel condition compared to other cultivation systems.

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“…The n- C17/pristane ratio and n- C18/phytane ratio were used to indicate biodegradation assuming that the isoprenoid hydrocarbons pristane ( n- C19) and phytane ( n- C20) had similar volatilities to n- C17 and n- C18 and that if they disappeared at different rates it would be caused by a mechanism ( e.g. , biodegradation) other than evaporation [ 24 ]. Isoprenoids are less susceptible than n -alkanes of similar molecular weights to microbial degradation.…”

Section: Resultsmentioning

confidence: 99%

“…It has been found in previous studies that methods for bioremediating hydrocarbons should be designed taking into account the diversity and metabolic adaptations of endogenous bacteria, particularly in areas with harsh conditions [ 19 , 22 ]. It has been found that a long adaptation period with endogenous bacteria is required if unadapted bacteria are used in bioaugmentation processes to remediate weathered oil-contaminated soil [ 23 , 24 ]. However, the fate of weathered oil in soil in arid areas like Qatar is not well investigated [ 25 ].…”

Section: Introductionmentioning

confidence: 99%

Potential for native hydrocarbon-degrading bacteria to remediate highly weathered oil-polluted soils in Qatar through self-purification and bioaugmentation in biopiles

Al-Kaabi

Al-Ghouti

Jaoua

et al. 2020

Biotechnology Reports

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Highlights Highly adapted hydrocarbon-degrading bacteria were isolated from weathered soils. High diversity of bacterial metabolism was shown although from the same soil. Biostimulation improves removal of weathered hydrocarbons by indigenous bacteria. Combination of stimulation to augmentation requires selection of indigenous strain. Without selection of strains, negative effect may be registered on bioremediation.

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Input of organic matter enhances degradation of weathered diesel fuel in sub-tropical sediments

Cited by 29 publications

References 48 publications

Impact of VOC removal by activated carbon on biodegradation rates of diesel, Syntroleum and biodiesel in contaminated sand

Impact of VOC removal by activated carbon on biodegradation rates of diesel, Syntroleum and biodiesel in contaminated sand

Organic Farming Improves Soil Microbial Abundance and Diversity under Greenhouse Condition: A Case Study in Shanghai (Eastern China)

Potential for native hydrocarbon-degrading bacteria to remediate highly weathered oil-polluted soils in Qatar through self-purification and bioaugmentation in biopiles

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