List of Articles نفت سفید

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  1 - Parametric assessment of soil hydraulic functions at presence of Kerosene contaminant
  Milad Nouri Mehdi Homaee Mohammed Bybordi
  Quantitative assessment of soils hydraulic properties that are contaminated with oils is crucial for optimal soil and water resources conservation. The objective of this study was to investigate Kerosene effect on soil hydraulic properties. For this purpose, the so More

  Quantitative assessment of soils hydraulic properties that are contaminated with oils is crucial for optimal soil and water resources conservation. The objective of this study was to investigate Kerosene effect on soil hydraulic properties. For this purpose, the soil retention curves and saturated hydraulic conductivity of Kerosene and water were determined by hanging column and constant head method, respectively. The soil retention curve parameters were obtained based on van Genuchten, Brooks-Corey and Campbell’s models. Unsaturated soil hydraulic conductivity for both fluids were predicted based on Mualem- Brooks-Corey, Burdine- Brooks-Corey, Mualem-van Genuchten and Campbell’s functions. The results indicated that Kerosene was retained less than water owing to its negligible surface tension, yielding less needed tension to drain kerosrene out from soils. Moreover, the magnitudes of the pore-size distribution parameters remained mostly unchanged and the bubbling pressure parameters were increased in Kerosene-air system compares to water-air system. The Kerosene-water matric potential ratio at the same soil fluid quantity was 0.48. The Leverett’s and suggested scale factors were determined 0.39 and 0.49, respectively, which indicates the soil fluid retention curves were appropriately scaled based on the recommended scale factor. Due to high kinematic viscosity of Kerosene and low soil retention for Kerosene, the saturated and unsaturated soil hydraulic conductivity of Kerosene was less than that of water. Manuscript profile
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  2 - Monitoring of the Transfer of Kerosene and Water through the Light Soil Contains Montmorillonite Nanoclay
  Shokufe Fazlali Soheila Ebrahimi Mehdi Zakerinia Sayyed Alireza Movahedi Naeini
  Water and organic contaminant transport in soil porous media, particularly in light textured soils due to high transmission capacity and create a secondary sources of pollution is  very important. The aim of this study was kerosene and water transport in a light te More

  Water and organic contaminant transport in soil porous media, particularly in light textured soils due to high transmission capacity and create a secondary sources of pollution is  very important. The aim of this study was kerosene and water transport in a light texture soil system containing different treatments of montmorillonite nanoclay. For this purpose, treatments including 0, 2, 4 and 6 wt% of nano clay- sandy soil in a funnel containing filter paper based system was applied. Then kerosene and water (4 pore volumes alternatively) were passed into soils. The breakthrough curves showed that the water passes through soils was slower and gentler slope, so the volume output was lower compared to kerosene. It seems that water molecules with a diameter of less than 3.0 nm fitted well in the small spaces between the layer of nanoclay, which are held with strong hydrogen bonds. Kerosene, with a density equals 0.78, only attract surface places, therefore, pass from porous soil surface well due to having molecules with 11 to 15 carbon atoms, which are larger than the density of water. In both fluids, the more percentage of nanoclay there is, the more retention of kerosene and water would be expected. The results of X-ray showed that the distance of nanoclay increased from 14.4 to 24.77 Å with addition of water. Manuscript profile
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  3 - Investigation the ability of bio-surfactant production by Bacillus laterosporus in various carbon sources
  Mahboobeh Varnaseri Ghandali Abdolamir Moezi Naeimeh Enayatizamir
  Background & Objectives: Biosurfactants are surface active compounds that produce by microorganisms. They are used in various industries such as petroleum, chemical, petrochemical, food industry, medicine, agriculture, etc. The purpose of this study was to optimize More

  Background & Objectives: Biosurfactants are surface active compounds that produce by microorganisms. They are used in various industries such as petroleum, chemical, petrochemical, food industry, medicine, agriculture, etc. The purpose of this study was to optimize the production of biosurfactant in different carbon sources by Bacillus laterosporus. Materials & Methods: In this study, Bacillus laterosporus was provided from the microbial collection of Shahid Chamran University of Ahwaz. Biosurfactant production was evaluated in different carbon sources such as kerosene, glucose and sugar cane molasses at 30 and 37° C and the incubation periods of 48 and 168 hours. Screening of biosurfactant production was carried out using oil collapse and emulsification index, surface tension, and cell surface hydrophobicity. Results: Bacillus laterosporus showed the lowest surface tension reduction in kerosene carbon source after 168 hours incubation at 37 ° C, and decreased surface tension to 21.28 mN/m. The highest percentage of emulsification was related to medium containing molasses carbon source (43%). Bacillus laterosporus cell surface hydrophobicity in kerosene, molasses and glucose was 65, 58 and 50 %, respectively. Maximum biosurfactant production by Bacillus laterosporus obtained in kerosene carbon source around 8.4 gr/L Conclusion: The results showed that 37° C, 168 hours incubation and also using kerosene as carbon sources make the optimum condition for biosurfactant production by indigenous strain of Bacillus laterosporus. Manuscript profile