Characterization of the removal of Chromium(VI) from groundwater by electrocoagulation

Shaima S. Hamdan, Muftah H. El-Naas

Research output: Contribution to journalArticlepeer-review

90 Citations (Scopus)

Abstract

A batch electrocoagulation system has been evaluated for the removal of Cr(VI) from brackish groundwater under different operating conditions. The influence of electrode type, applied current density, initial pH, initial chromium concentration, conductivity and temperature were evaluated. The experimental results indicated that chromium removal increased with increasing the applied current density and conductivity. The efficiency of different electrode arrangements (iron, aluminum) was also assessed, and indicated that Fe-Fe electrode pair was the most efficient arrangement and was able to achieve 100% Cr removal at an electrocoagulation time of 5min, a current density of 7.94mA/cm2, and pH of 8 at room temperature 25°C. The generated sludge for the iron electrodes was characterized using EDS, X-ray fluorescence (XRF) and FE-SEM. The analysis confirmed the formation and precipitation of Fe(OH)3 and Cr(OH)3 as solids. Overall, the study affirmed that electrocoagulation is a reliable technique for the purification of groundwater with an estimated energy consumption of 0.6kWh/m3.

Original languageEnglish
Pages (from-to)2775-2781
Number of pages7
JournalJournal of Industrial and Engineering Chemistry
Volume20
Issue number5
DOIs
Publication statusPublished - Sep 25 2014

Keywords

  • Brackish water
  • Electrocoagulation
  • Groundwater
  • Hexavalent chromium
  • Sludge

ASJC Scopus subject areas

  • Chemical Engineering(all)

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