Journal
SEPARATION AND PURIFICATION TECHNOLOGY
Volume 200, Issue -, Pages 266-272Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.seppur.2018.02.014
Keywords
Chromium; Chemical coagulation; Electrocoagulation; Drinking water; Semi-pilot scale
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Funding
- Mexican Institute of Water Technology (IMTA)
- Ministry of Environment and Natural Resources (SEMARNAT)
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Chemical Coagulation (CC) and Electrocoagulation (EC) processes using iron as coagulating agent were compared while treating aquifer water contaminated by a relatively high concentration of total chromium (CrT = 19.0 mg L-1). A continuous semi-pilot comprising of EC (or CC), followed by flocculation, sedimentation and sand-filtration steps was used to remove CrT from water in order to get drinking water. A ratio of Fe/CrT >= 3 was required to reach the best efficiency of treatment using EC and CC. More than 99% of CrT was removed and residual CrT concentration below 0.05 mg L-1 (the limiting value recommended by WHO) could be obtained using the both configurations. However, CC increased the concentration of dissolved solids above the guideline recommended for drinking water.
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