نوع مقاله : مقاله کامل پژوهشی
1 دانش آموخته دانشگاه آزاد اسلامی واحد تهران غرب
2 دانشیار، دانشگاه آزاد اسلامی واحد تهران غرب
3 دانشگاه آزاد اسلامی واحد تهران غرب
عنوان مقاله [English]
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.