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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.

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    0533136 - ÚCHP 2021 RIV CH eng J - Journal Article
    Krystyník, Pavel - Mašín, P. - Krušinová, Z. - Klusoň, Petr
    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. Roč. 12, č. 10 (2020), č. článku 2894. E-ISSN 2073-4441
    R&D Projects: GA TA ČR TA04020130; GA TA ČR(CZ) TH03030388
    Institutional support: RVO:67985858
    Keywords : electrocoagulation * water treatment * site remediation
    OECD category: Chemical process engineering
    Impact factor: 3.103, year: 2020
    Method of publishing: Open access
    https://www.mdpi.com/2073-4441/12/10/2894

    A modular electrocoagulation unit, supported by Ca(OH)2 addition to treated water, wasoperated 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.
    Permanent Link: http://hdl.handle.net/11104/0313715

     
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