چكيده به لاتين
In the present study, various remediation techniques with in-situ and off-situ characteristics and/or physical, chemical, and biological features are reviwed. The performances of an in-situ technique in an aquifer, contaminated by heavy metal, is evaluated based on remediation time and efficiency criteria. The groundwater hydraulic and water quality simulation model of Emamzadeh Jafar Aquifer, contaminated with Selenium pollutant, in GMS environment is calibrated based on field data. Then, the numerical simulation model is applied in the evaluation of various remediation scenarios in Emamzadeh-Jafar aquifer. In this research, premeable reactive barrier (PRB) technique is applied in aquifer remediation. Various effective factors in PRB charecteristics such as placement status, thickness, reaction coefficient, and hydraulic conductivity coefficient are analyzed comprehensively. Due to oblique flow lines in Emamzadeh Jafar aquifer, the effects of PRB vertical and horizontal placement have been investigated. The applied PRB in aquifer remediation, occupied three numerical computational elements, each with 30 m in length and 10 m in width. The results demonstrate, the horizontal placement of PRB in Emamzadeh-Jafar aquifer is more effective in remediation than vertical placement. Furthermore, the reaction coefficient is the most important factor in PRB performances with 51% contribution in Selenioum removal. However, the effects of PRB width in pollutant retention time in treatment media could be obvious, especially in the low reactive material of PRB.
The simulation model results show in pollution source control scenario, it will take about 7 years to Emamzadeh-Jafar aquifer remediation, while the Selenium concentration will meet the standards levels. In the aforementioned scenario, the PRB application in the Emamzadeh-Jafar aquifer will reduce the remediation time to six months.
