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Articles by Ghaida Abu-Rumman
Total Records ( 3 ) for Ghaida Abu-Rumman
  Adnan I. Khdair , Salam Ayoub and Ghaida Abu-Rumman
  Different techniques of oil extraction are applied in Jordan, including traditional press, two- and three-phase systems. Results of the study indicated that there is a significant difference in olive oil quality obtained from different pressing systems in terms of free acidity, ultraviolet absorption, peroxide value, polyphenol content, organoleptic assessment and overall quality index. Olive oils obtained from the two-phase mills were classified as extra virgin olive oil. While, olive oils obtained from the three-phase mill were ranged from extra to ordinary virgin olive oil. In the contrary olive oils obtained from the three conventional mills were classified as lampante virgin olive oil. The two-phase decanters produce high quality olive oils with higher contents of total polyphenols which makes them more resistant to oxidation during storage. These decanters, also having an advantage of saving on wastewater disposal costs because they produce only a small amount of such waste.
  Adnan I. Khdair and Ghaida Abu-Rumman
  Olive Mills Wastewater (OMWW) contains organic matter which can be added as soil amendment and might be highly beneficial to agricultural soils. However, the organic matter in the olive mills wastewater contains oil which might affects soil thermal conductivity, water retention and hence infiltration rate. The effect of adding Olive Mills Wastewater (OMWW) on soil thermal conductivity has been carefully investigated in the laboratory. Three soils were used and classified as sandy clay, silty clay and clay. The thermal conductivity of the soil was determined using a single probe technique. At given moisture content and bulk density, results showed that OMWW concentration had direct effect on soil thermal conductivity. For all soils tested soil thermal conductivity decrease as OMWW applied to soil samples. The decrease in soil thermal conductivity has been noticed at all levels of OMWW concentration but significantly different at 60% or higher. The thermal conductivity values were higher for sandy clay than silty clay and clayey soil at all OMWW concentrations. Thermal conductivity values between 0.89-0.70 W m-1 K-1 were obtained for sandy clay soil, between 0.77-0.63 W m-1 K-1 for silty clay soil and between 0.80-0.57 W m-1 K-1 for clay soil as OMWW concentration increased from 20-100% at water contents of 0.20 cmper3 cm-3 and bulk density of 1.25 g cm-3. Graphical and statistical comparisons of thermal conductivity obtained for the three soils used are presented.
  Ghaida Abu-Rumman
  Background and Objective: Addition of organic wastes to agricultural soils is becoming a common practice as a disposal strategy and to improve the physical and chemical soil properties and increase the soil productivity. Amendments of agricultural lands with olive pomace become a common practice in the middle East. However, the olive mills waste contains small fraction of oil which might affects soil water retention and infiltration. The objectives of this study were to investigate changes in soil physical properties resulted from the addition of Olive Mill Solid Waste (OMSW). The properties studied were: Penetration depth, water holding capacity, accumulated intake and bulk density. Materials and Methods: The Olive Mill Solid Waste (OMSW) at three rates: 3, 6 and 9% by weight were added to two soils classified as clay (clay 55, silt 25 and sand 20%) and sandy clay (sand 55, clay 40 and silt 5%) soils. A pressure plate apparatus was used to construct soil water retention curves at a pressure varies between 0.30 (Wilting) to 1500 kPa (Saturation). The infiltration tests were performed using FEL5 demonstration infiltration apparatus. Results: The application of (OMSW) significantly improved the physical properties of the soils studied relative to untreated soil (control). For clay soil and application rate of 9%, the penetration depth and accumulated water intake were increased 30 and 29%, respectively. The corresponding increases in sandy clay soil were 25 and 32%, respectively. At application rate of 9%, the soil (WHC) increased were 10.3 and 16.5% for clay and sandy clay soils, respectively. Accumulation intake increased as application rate increased; while bulk density decreased as a result of the dilution effect resulting from mixing organic matter with the more dense soil minerals. Conclusion: Applications of OMSW increases the organic content of the soil and at the same time reduces its bulk density. The increase in (WHC) at field capacity and wilting point can be attributed to changes in soils textures which resulted from increases in soil organic C. The Water Holding Capacity (WHC), penetration depth and accumulated infiltration increased as (OMSW) application rates increased. The increases in (WHC) depend on soil texture, for fine-textured soils, the increase in (WHC) at wilting point is less than at field capacity. The opposite occurred in coarse-textured soils as a result of sand fraction, significant increase in (WHC) at wilting point rather than at field capacity.
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