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Open AccessArticle

Ecologically Non-Invasive Decontamination of Natura 2000 Locality from Old Deposits of Hexavalent Chromium and Bivalent Nickel by Modular Electrocoagulation Combined with Ca(OH)2 Addition

1
Institute of Chemical Process Fundamentals, Academy of Sciences of the Czech Republic, Rozvojova 135, 165 02 Prague 6, Czech Republic
2
Faculty of Environment, University of J.E. Purkyne, Pasteurova 3632/15, 400 96 Usti nad Labem, Czech Republic
3
Dekonta a.s., Dretovice 109, 273 42 Stehlceves, Czech Republic
4
Institute for Environmental Studies, Faculty of Science, Charles University, Benatska 2, 128 01 Prague 2, Czech Republic
*
Author to whom correspondence should be addressed.
Water 2020, 12(10), 2894; https://doi.org/10.3390/w12102894
Received: 31 August 2020 / Revised: 12 October 2020 / Accepted: 13 October 2020 / Published: 16 October 2020
(This article belongs to the Special Issue Advanced Applications of Electrocoagulation in Water and Wastewater)
A modular electrocoagulation unit, supported by Ca(OH)2 addition to treated water, was operated in the vicinity of a Natura 2000 site for the removal of Cr6+ or Ni2+ from contaminated groundwater. The process was performed at a constant flow rate of 350 L/h. Day 0 concentrations of Cr6+ and Ni2+ started at 91.6 mg/L for Ni2+ and 43 mg/L for Cr and during testing, were decreased by 15%–25%. Residual concentrations of Crtot. and Ni2+ below the required limits of 0.5 mg/L for Crtot. and 0.8 mg/L for Ni2+ can be achieved with the electrocoagulation unit and total removal efficiencies often exceeded 98%. The overall economic assessment showed its feasible application for removal of Cr6+ and Ni2+ on sites with requirements of high environmental protection standards. The polluted area was about 150 × 150 m (22,500 m2), and it contained approximately 78,750 m3 of water contaminated with Cr6+ and Ni2+ (over 41 and 91 mg/L, respectively). The modular arrangement might allow a scaling up. The process’ output could be thus increased according to the number of EC modules in operation. View Full-Text
Keywords: Natura 2000; electrocoagulation; water treatment; site remediation; chromium; nickel; removal Natura 2000; electrocoagulation; water treatment; site remediation; chromium; nickel; removal
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Krystynik, P.; Masin, P.; Krusinova, Z.; Kluson, P. Ecologically Non-Invasive Decontamination of Natura 2000 Locality from Old Deposits of Hexavalent Chromium and Bivalent Nickel by Modular Electrocoagulation Combined with Ca(OH)2 Addition. Water 2020, 12, 2894.

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