Study of polyaromatic hydrocarbons in current used motor oils

Cvengroš, Ján; Liptaj, Tibor; Prónayová, Naďa

doi:10.15406/ipcse.2017.02.00060

Cited by 12 publications

(7 citation statements)

References 28 publications

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“…The increase in incubation period could have also accounted for the reduction in the total hydrocarbon content of the medium. This means that the hydrocarbons were utilized by these bacterial isolates during the biodegradation process as a source of carbon and energy (Cvengros et al, 2017).…”

Section: Resultsmentioning

confidence: 99%

Biodegradation Potentials of Waste Engine Oil by Three Bacterial Isolates

Enerijiofi¹,

Ahonsi²,

Ajao³

2020

jasem

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Environmental contamination by waste engine oil in cities all over the world constitute serious public health concern because its effects are unwholesome and unquantifiable. This study was carried out to biodegrade waste engine oil using bacterial isolates. Three bacteria were isolated from soil samples that have been contaminated with waste engine oil for over seven years in automechanic workshops at Ebelle. They were analysed using standard methods. The bacterial count was 89.4 ± 0.02cfu/g while the control was 3.6 ± 0.14cfu/g. The bacterial diversity identified in descending order were Bacillus sp. (25.41%), Pseudomonas sp. (22.13%), Corynebacterium sp. (18.44%), Acetobacter sp. (18.03%) and Aeromonas sp. (15.98%). The biodegradation efficiencies of three bacterial isolates; Bacillus, Pseudomonas and Corynebacterium species were observed taking records of change in physicochemical parameters (pH, electrical conductivity and total hydrocarbon content) for 40 days at 10 days interval with waste engine oil sample at concentrations of 10%, 20%, 30% and 40%. Corynebacterium sp. gave the highest percentage reduction in pH values of 52.92% at 10% contamination level while Pseudomonas sp. gave the highest percentage reduction of 53.04%, 52.99% and 53.01% at 20%, 30% and 40% crude oil contamination levels respectively. The pH values of the control was almost the same all through the period of incubation. Bacillus sp. gave the highest percentage increase in electrical conductivity value of 74.17%, 69.93% and 69.91% at 10%, 20% and 40% contamination level respectively while Pseudomonas sp. gave the highest increase of 70.45% at 30% contamination level. Also, the values at day 0 and the control were not so different from each other. Corynebacterium sp. gave the highest percentage reduction in total hydrocarbon content of 95.49%, 95.48%, 96.50% and 96.50% at 10%, 20%, 30% and 40% contamination level respectively. The result revealed a reduction in pH and total hydrocarbon content while there was an increase in electrical conductivity values. This indicated that biodegradation occurred. This study revealed that the bacterial isolates particularly Corynebacterium sp. possess the ability to biodegrade waste engine oil thereby guaranteeing environmental quality and sustained public health for all and sundry. Keywords: biodegradation, Corynebacterium sp., environmental sustainability, total hydrocarbon content

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Section: Resultsmentioning

confidence: 99%

Biodegradation Potentials of Waste Engine Oil by Three Bacterial Isolates

Enerijiofi¹,

Ahonsi²,

Ajao³

2020

jasem

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“…In particular, Lu et al [23] have conducted an experimental campaign by means of Gas Chromatography (GC) to understand the composition differences in both used and unused engine oil, finding that PAH were present only in used engine oils. Also, Cvengroš et al [24] used proton nuclear magnetic resonance (H NMR) spectroscopy through Hbay methodology to determine the PAH contents in 15 selected samples of unused engine oil, which were even lower with respect to the regulations. Williams et Al.…”

Section: Pure Components Choicementioning

confidence: 99%

“…32 are universal coefficients (-0.3416, 2.2671, 0.1064, -0.3874, -9.8231 x 10 -5 , 4.182 x 10 -4 , respectively).Liquid thermal conductivity is modelled with equation 4 from Perry's Chemical Handbook[24]: Liquid thermal conductivity is in W/m K, 𝐶 and 𝑛 are constants equal to 1.001 and 1.811• 10 −4 respectively for straight chain hydrocarbons,…”

mentioning

confidence: 99%

A Numerical Methodology to Test the Lubricant Oil Evaporation and Its Thermal Management-Related Properties Derating in Hydrogen-Fueled Engines

De Renzis,

Mariani,

Bianchi

et al. 2023

SAE Int. J. Engines

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<div>Due to the incoming phase out of fossil fuels from the market in order to reduce the carbon footprint of the automotive sector, hydrogen-fueled engines are candidate mid-term solution. Thanks to its properties, hydrogen promotes flames that poorly suffer from the quenching effects toward the engine walls. Thus, emphasis must be posed on the heat-up of the oil layer that wets the cylinder liner in hydrogen-fueled engines. It is known that motor oils are complex mixtures of a number of mainly heavy hydrocarbons (HCs); however, their composition is not known a priori. Simulation tools that can support the early development steps of those engines must be provided with oil composition and properties at operation-like conditions. The authors propose a statistical inference-based optimization approach for identifying oil surrogate multicomponent mixtures. The algorithm is implemented in Python and relies on the Bayesian optimization technique. As a benchmark, the surrogate for the SAE5W30 commercial multigrade oil has been determined. Then, this multicomponent surrogate and a SAE5W30 pseudo-pure are compared by means of an oil film model, which accounts for oil heat exchange with the cylinder wall and the gases from hydrogen combustion, and its evaporation. The results in terms of oil film temperature, viscosity, and thickness under hydrogen-engine boundaries are evaluated. Analyses reveal that the optimized multicomponent mixture behavior is more realistic and can outperform the pseudo-pure approach when the oil phase change and the oil-in-cylinder presence must be considered.</div>

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“…According to J. Cvengroš, T. Liptaj and N. Pronayova [5], the PAH content in a new motor oil is relatively low, but increases with motor operating time. The benzo[a]pyrene content of new motor oil can be up to 0.266 mg/kg but that of used motor oils from petrol cars can be up to 216 mg/kg, i.e.…”

Section: Introductionmentioning

confidence: 99%

Silver-coated monolitic silica column for separation of benzo[a]pyrene from petroleum

Poškus¹,

Vičkačkaitė²,

Rokaitė³

2021

chemija

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Monolithic silica solid-phase extraction column has been successfully applied for the rapid fractionation and subsequent gas chromatographic analysis of benzo[a]pyrene from the diesel and oil matrix. Due to π-π electronic interactions between silver nanoparticles on the sorbent surface and aromatic analyte specific retention was achieved. It was demonstrated that only 0.2 g of the sorbent and 6 ml of the organic solvent are enough for such separation.

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Study of polyaromatic hydrocarbons in current used motor oils

Cited by 12 publications

References 28 publications

Biodegradation Potentials of Waste Engine Oil by Three Bacterial Isolates

Biodegradation Potentials of Waste Engine Oil by Three Bacterial Isolates

A Numerical Methodology to Test the Lubricant Oil Evaporation and Its Thermal Management-Related Properties Derating in Hydrogen-Fueled Engines

Silver-coated monolitic silica column for separation of benzo[a]pyrene from petroleum

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