List of Articles Soil washing

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  1 - Optimization of Soil washing process in the presence of Tween 80 and EDTA compounds in removing PAHs and Cadmium contaminants from contaminated soil by method BBD
  Motahareh Harati roshanak rezaei kalantary
  10.22034/jest.2019.35362.4238
  Background and Objective: Pollution caused by petroleum compounds (PAHs) and heavy metals due to their properties Cumulative and High toxicity Causing major environmental problems. These compounds, although detected in air and water, are the final and main receptive soi More

  Background and Objective: Pollution caused by petroleum compounds (PAHs) and heavy metals due to their properties Cumulative and High toxicity Causing major environmental problems. These compounds, although detected in air and water, are the final and main receptive soil. Soil washing process using surfactants is a high-performance physicochemical technology for the removal of phenanthrene and cadmium from the soil environment and transferring them to the aqueous phase. Method: In this study, the efficiency of the process with the BBD method, with RSM, was designed to optimizing parameters such as surfactant concentration in the range 1000,1500 and 2000 mg/L, washing Time 2,12, 24 hours with L/S 10, 20 and 30 ml/g. To contaminated soil samples were added high concentrations Phenanthrene (500 mg/kg) and Cadmium (80 mg/kg), surfactant Tween 80 and EDTA. Findings: The final concentration of Phenanthrene and Cadmium was measured by HPLC and atomic absorption spectrometry (ASS). The results showed that the efficiency of the process under optimal conditions for the separation of 76% Phenanthrene and 81% Cadmium in separate concentrations of Tween 80 and EDTA was reached in 2000 mg/L, L/S 30 ml/g (v/w), washing time 2 hours. Surfactant concentration was the most influential variable in this regard (p< 0.0001). Discussion & Conclusion: The separation of phenanthrene and Cadmium from the soil through the help of surfactants is an effective technique for remediation of contaminated soil.   Manuscript profile
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  2 - Ex-situ removal of crude oil from a contaminated soil using Sodium Dodecyl Sulfate (SDS)
  Mehdi Hosnani Hossein Amani Mohammad Reza Sarmasti Emami
  10.22034/jest.2019.14541
  Background Objective: Soil is the basic component of environment and the main source of food production and its contamination can cause pose many challenges for humans and other living organisms. Although many studies have been done separately to eliminate organic pollu More

  Background Objective: Soil is the basic component of environment and the main source of food production and its contamination can cause pose many challenges for humans and other living organisms. Although many studies have been done separately to eliminate organic pollutants such as benzene and phenolic compounds from soil, a few studies yet have been done on the removal of crude oil which contains different types of hydrocarbon compounds from the soil. The aim of this study is to determine the removal of crude oil from the soil and provide a comprehensive model. Method: In this study, the ex-situ soil washing method with surface active agent has been used to remove crude oil from soil. For this purpose, first, the soil was artificially polluted with crude oil and then the effects of various parameters such as surfactant concentration in aqueous solutions, the initial concentration of contaminant in the soil, pH, volume of detergent solution, stirring rate, duration of the process and system temperature were evaluated. Findings: The results showed the optimal conditions for the removal of crude oil were concentration of surfactant in aqueous solution of 0.5% (w/w), initial concentration of crude oil of 5% (w/w), detergent solution pH=11, detergent solution volume of 50 ml, stirring rate of 200 rpm, experiment duration of 15 m and temperature of 45 °C. In optimal condition, about 96% of crude oil was removed from the soil. Discussion and Conclusion: According to the obtained results, surfactants can be used as a proper substance to remove oil contaminants from soil with a good efficiency. Manuscript profile