Hybrid soil washing process with ozonation in a sequencing batch reactor to remediate arsenic-contaminated soil and petroleum compounds

Authors

1 Islamic Azad University, West Tehran Branch

2 Associate professor, Islamic Azad University, West Tehran Branch

Abstract

With the increasing industrial activities relating to oil compounds, numerous environmental problems have emerged. Pollution of water resources, soil and air lead to irreparable damages to environment. Therefore, researchers have been seeking solutions to revitalize the environment. In this study, efficiency of hybrid process of soil washing/ ozonation/ suspended biological reactor (SBR) was investigated to reduce the COD and Arsenic of South Tehran refinery polluted soils. Effect of pH, reaction time, surfactant concentration in soil washing process (Optimal condition 6.6, 100 minutes and 47.7 mg / l, respectively), pH, reaction time and Ozone concentration in ozonation process (Optimal condition 2, 10 minutes and 5 mg / l, respectively)

and sludge retention time, hydraulic retention time and Oxygen concentration in SBR (Optimal state 30 hours, 6.3 days and 3.36 mg / l, respectively) were optimized through Response Surface Methodology (RSM). According to the result of this study, soil washing could reduce %84.3±1.7 of Arsenic and %82.3±1.25 of COD and turn them into liquid phase. Afterward, ozonation process could reduce %91±0.82 of COD and %0.00 of Arsenic and finally SBR process could reduce %82±2.16 of Arsenic and %84.6±2.67 of COD and the final concentration of Arsenic and COD were reduced to 5.22 and 297.4 mg/l, respectively.

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Main Subjects

Journal of Civil and Environmental Engineering

Articles in Press, Accepted Manuscript
Available Online from 29 January 2022

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