The BTEX group of contaminants consists of benzene, ethylbenzene, toluene, and three isomers of xylene. The dissolution rate, solubility, slick area and mass transfer coefficient were examined for the BTEX. The release of BTEXs into the environment is influenced by their fate and transport mechanisms. Thus, the fate and transport mechanisms are affected by the contaminant characteristics, which vary with the different BTEX compounds. A comprehensive model has been developed to simulate the molecular dissolution rate of BTEX contaminants in a natural water stream. The developed model modifies the work of Cohen et al. (1980) by considering the physicochemical properties of the BTEX compounds and physical processes relevant to the spreading of contaminants in the sea. The model shows that Benzene with greater solubility in water and dissolution coefficient has the largest dissolution rate while o‐xylene with the biggest density has the lowest dissolution rate because of its low fraction. The benzene dissolution rate is about 2.6, 20.6 times that of Toluene, ethylbenzene, respectively, but with a varying proportion with the xylenes. The model has been validated against the theories of mass transfer rate at the surface at appropriate surface area. The developed model can be found useful in prediction and monitoring the dissolution rate of contaminants in soil and water systems.
Investigation was carried out to examine the characterization and physicochemical properties of some wood sawdust obtained from Niger Delta Area of Nigeria limited for the purpose of usage as an absorbent for remediation of contaminant in soil environment. Experimental examination was conducted on value, moisture content, bulk density and porosity, iodine number and ash content for the various wood sawdust samples from Obuba and Abura, Opepe/mahogany. The result obtained revealed that the pH value of Obuba red (soft wood) is 5.48, Abura (hard wood) 6.18, opepe/mahogany (hard wood) 5.75 and iroko (soft wood) 5.29, whereas the moisture content value opepe/mahogany and iroko. The result further revealed that the bulk density and the porosity value are as presented, grain volume value are 2.910, 2.475, 1.931, and 2.959, bulk density value are 1.0317, 0.884, 0.2190, 0.4306, 0.5490, and 0.3499 for obuba red, abura, opepe/mahogany and iroko. The iodine number tested demonstrates the following value of 10.20, 6.90, 13.90 and 5:9 and 6.6 for obuba red, abura, opepe/mahogany and iroko. Finally, it was demonstrated that the usefulness of characterization and examination of physicochemical properties of functional components that control and improve the monitoring, predicting and determination of the kinetics values.
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