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Selenium removal from petroleum refinery wastewater using an electrocoagulation technique.

Henrik K Hansen1, Sebastián Franco Peña1, Claudia Gutiérrez1

  • 1Departamento de Ingeniería Química y Ambiental, Universidad Técnica Federico Santa María, Valparaíso, Chile.

Journal of Hazardous Materials
|October 20, 2018
PubMed
Summary

Electrocoagulation effectively removes selenium from petroleum refinery wastewater. This iron-electrode process achieved 90% selenium reduction in 6 hours, offering a viable treatment solution.

Keywords:
Current densityElectrocoagulationIron hydroxidesOxidizing mediumSelenium

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Area of Science:

  • Environmental Engineering
  • Water Treatment Technologies
  • Electrochemistry

Background:

  • Petroleum refineries generate wastewater containing toxic selenium.
  • Effective selenium removal is crucial for environmental protection and regulatory compliance.
  • Conventional treatment methods may be insufficient or costly for selenium remediation.

Purpose of the Study:

  • To evaluate electrocoagulation as a technological alternative for selenium removal from petroleum refinery wastewater.
  • To investigate the efficiency of iron electrodes in an electrocoagulation process for selenium treatment.
  • To determine the impact of treatment time and current density on selenium removal rates.

Main Methods:

  • A batch airlift reactor with air stirring was employed for the electrocoagulation process.
  • Sacrificial iron electrodes were used to generate ferrous ions for selenium precipitation.
  • Wastewater selenium concentrations were monitored before and after treatment over a 6-hour period.

Main Results:

  • Electrocoagulation achieved a 90% removal of selenium from the wastewater.
  • Selenium concentration decreased from 0.30 mg/L to 0.03 mg/L after 6 hours of treatment.
  • Current density was identified as a significant operational variable influencing the removal efficiency.

Conclusions:

  • Electrocoagulation using iron electrodes is a feasible and effective method for treating selenium in petroleum refinery wastewater.
  • The process demonstrates high selenium removal efficiency, reducing concentrations to environmentally acceptable levels.
  • Further optimization of current density could enhance the electrocoagulation process performance.