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Life Cycle Assessment of Asphalt Mix Containing Jordanian Oil Shale Ash

Alhunity Rozalya, Aljbour Salah H., El Qada Emad N.

Ecological Engineering & Environmental Technology

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2023

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Vol. 24, iss. 2

79--86

EN

The focal theme of this study is to evaluate the life cycle of asphalt mix containing Jordanian oil shale ash (OSA). Life cycle assessment (LCA) approach was conducted to assess the environmental impact of all manufacturing stages of the asphalt mix from Global warming potential (GWP) and energy consumption (EC) perspectives. The documentation for the LCA study was done in accordance with ISO 14044:2006 standards for the research’s goal and scope, inventory analysis, impact assessment, and interpretation. The results revealed that replacing the asphalt mix partially with Jordanian OSA (10 wt.%) resulted in slight reduction in both GWP and EC. A reduction of 2.83% and 4.8% for GWP and EC, respectively, was obtained.

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Cerium-Promoted Nickel /Alumina Catalyst for Producer Gas Reforming and Tar Conversion

Aljbour Salah H., Kawamoto Katsuya

Journal of Ecological Engineering

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2022

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Vol. 23, nr 6

58--66

EN

The catalytic conversion of a model tar compound, namely: naphthalene contained in a simulated producer gas from wood gasification process was investigated. The sol-gel approach was used to create a mesoporous Cepromoted Ni/alumina catalyst with high surface area. A surface area of 333 m2g was achieved by calcination of the mesoporous catalyst (17 wt% Ni and 2.8 wt% Ce) under air conditions at 1123 K. The catalysts were characterized using the N2 adsorption-desorption, XRD, and SEM techniques, and their promotion effect on producer gas reforming and tar removal was studied under dry, steam, and partial oxidation conditions. The Ni-based catalysts effectively converted naphthalene and increased the proportion of H2 and CO in the reformed gas. Incorporating Ce into the catalyst increased the proportion of H2 and CO in the reformed gas, while lowering the amount of CH4 and CO2. In the absence of oxygen, catalytic reforming of the producer gas resulted in 79.6% naphthalene conversion, whereas catalytic partial oxidation conditions resulted in 99.1% naphthalene conversion.

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Growth Kinetics and Toxicity of Pseudomonas fredriksbergsis Grown on Phenol as Sole Carbon Source

Aljbour Salah H., Khleifat Khaled M., Al Tarawneh Amjad, Asasfeh Batool, Qaralleh Haitham, El-Hasan Tayel, Magharbeh Mousa K., Al-Limoun Muhamad O.

Journal of Ecological Engineering

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2021

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Vol. 22, nr 10

251--263

EN

Phenol is one of the main pollutants that have a serious impact on the environment and can even be very critical to human health. The biodegradation of phenol can be considered an increasingly important pollution control process. In this study, the degradation of phenol by Pseudomonas fredriksbergsis was investigated for the first time under different growth conditions. Six different initial concentrations of phenol were used as the primary substrate. Culture conditions had an important effect on these cells' ability to biodegrade phenol. The best growth of this organism and its highest biodegradation level of phenol were noticed at pH 7, temperature 28 °C, and periods of 36 and 96 h, respectively. The highest biodegradation rate was perceived at 700 mg/L initial phenol concentration. Approximately 90% of the phenol (700 mg/L) was removed in less than 96 hours of incubation time. It was found that the Haldane model best fitted the relationship between the specific growth rate and the initial phenol concentration, whereas the phenol biodegradation profiles time could be adequately described by the modified Gompertz model. The parameters of the Haldane equation are: 0.062 h−1, 11 ppm, and 121 ppm for Haldane’s maximum specific growth rate, the half-saturation coefficient, and the Haldane’s growth kinetics inhibition coefficient, respectively. The Haldane equation fitted the experimental data by minimizing the sum of squared error (SSR) to 1.36×10-3.

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Anaerobic Co-Digestion of Domestic Sewage Sludge with Food Waste: Incorporating Food Waste as a Co-Substrate Under Semi-Continuous Operation

Aljbour Salah H., Al-Hamaiedeh Husam, El-Hasan Tayel, Hayek Bassam O., Abu-Samhadaneh Khalid, Al-Momany Salam, Aburawaa Ayman

Journal of Ecological Engineering

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2021

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Vol. 22, nr 7

1--10

EN

Anaerobic co-digestion of domestic sewage sludge with food waste as a substrate for biogas production and as a mean for waste management was conducted. The food waste was incorporated into the bioreactor as a cosubstrate semi-continuously via replacement mode and addition mode of operations in ratios up to 50%. The methane gas yield under the replacement mode of operation ranged from 295 to 1358 ml/gVSadded and from 192 to 462 ml/gVSadded for the replacement mode of operation and the addition mode of operation, respectively. The results indicate that the methane gas yield increases along with the percentage share of food waste in the feed. Anaerobic co-digestion under semi-continuous operation enabled handling large organic loadings compared to batch co-digestion processes.