Ecologically Non-Invasive Decontamination of Natura 2000 Locality from Old Deposits of Hexavalent Chromium and Bivalent Nickel by Modular Electrocoagulation Combined with Ca(OH)<sub>2</sub> Addition
A modular electrocoagulation unit, supported by Ca(OH)<sub>2</sub> addition to treated water, was operated in the vicinity of a Natura 2000 site for the removal of Cr<sup>6+</sup> or Ni<sup>2+</sup> from contaminated groundwater. The process was performed at a con...
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MDPI AG
2020-10-01
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| Series: | Water |
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| Online Access: | https://www.mdpi.com/2073-4441/12/10/2894 |
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| author | Pavel Krystynik Pavel Masin Zuzana Krusinova Petr Kluson |
| author_facet | Pavel Krystynik Pavel Masin Zuzana Krusinova Petr Kluson |
| author_sort | Pavel Krystynik |
| collection | DOAJ |
| description | A modular electrocoagulation unit, supported by Ca(OH)<sub>2</sub> addition to treated water, was operated in the vicinity of a Natura 2000 site for the removal of Cr<sup>6+</sup> or Ni<sup>2+</sup> from contaminated groundwater. The process was performed at a constant flow rate of 350 L/h. Day 0 concentrations of Cr<sup>6+</sup> and Ni<sup>2+</sup> started at 91.6 mg/L for Ni<sup>2+</sup> and 43 mg/L for Cr and during testing, were decreased by 15%–25%. Residual concentrations of Cr<sub>tot.</sub> and Ni<sup>2+</sup> below the required limits of 0.5 mg/L for Cr<sub>tot.</sub> and 0.8 mg/L for Ni<sup>2+</sup> 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 Cr<sup>6+</sup> and Ni<sup>2+</sup> on sites with requirements of high environmental protection standards. The polluted area was about 150 × 150 m (22,500 m<sup>2</sup>), and it contained approximately 78,750 m<sup>3</sup> of water contaminated with Cr<sup>6+</sup> and Ni<sup>2+</sup> (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. |
| first_indexed | 2024-03-10T15:33:46Z |
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| id | doaj.art-b5a86ac472164f2f879a9340f2711f30 |
| institution | Directory Open Access Journal |
| issn | 2073-4441 |
| language | English |
| last_indexed | 2024-03-10T15:33:46Z |
| publishDate | 2020-10-01 |
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| series | Water |
| spelling | doaj.art-b5a86ac472164f2f879a9340f2711f302023-11-20T17:26:13ZengMDPI AGWater2073-44412020-10-011210289410.3390/w12102894Ecologically Non-Invasive Decontamination of Natura 2000 Locality from Old Deposits of Hexavalent Chromium and Bivalent Nickel by Modular Electrocoagulation Combined with Ca(OH)<sub>2</sub> AdditionPavel Krystynik0Pavel Masin1Zuzana Krusinova2Petr Kluson3Institute of Chemical Process Fundamentals, Academy of Sciences of the Czech Republic, Rozvojova 135, 165 02 Prague 6, Czech RepublicDekonta a.s., Dretovice 109, 273 42 Stehlceves, Czech RepublicInstitute for Environmental Studies, Faculty of Science, Charles University, Benatska 2, 128 01 Prague 2, Czech RepublicInstitute of Chemical Process Fundamentals, Academy of Sciences of the Czech Republic, Rozvojova 135, 165 02 Prague 6, Czech RepublicA modular electrocoagulation unit, supported by Ca(OH)<sub>2</sub> addition to treated water, was operated in the vicinity of a Natura 2000 site for the removal of Cr<sup>6+</sup> or Ni<sup>2+</sup> from contaminated groundwater. The process was performed at a constant flow rate of 350 L/h. Day 0 concentrations of Cr<sup>6+</sup> and Ni<sup>2+</sup> started at 91.6 mg/L for Ni<sup>2+</sup> and 43 mg/L for Cr and during testing, were decreased by 15%–25%. Residual concentrations of Cr<sub>tot.</sub> and Ni<sup>2+</sup> below the required limits of 0.5 mg/L for Cr<sub>tot.</sub> and 0.8 mg/L for Ni<sup>2+</sup> 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 Cr<sup>6+</sup> and Ni<sup>2+</sup> on sites with requirements of high environmental protection standards. The polluted area was about 150 × 150 m (22,500 m<sup>2</sup>), and it contained approximately 78,750 m<sup>3</sup> of water contaminated with Cr<sup>6+</sup> and Ni<sup>2+</sup> (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.https://www.mdpi.com/2073-4441/12/10/2894Natura 2000electrocoagulationwater treatmentsite remediationchromiumnickel |
| spellingShingle | Pavel Krystynik Pavel Masin Zuzana Krusinova Petr Kluson Ecologically Non-Invasive Decontamination of Natura 2000 Locality from Old Deposits of Hexavalent Chromium and Bivalent Nickel by Modular Electrocoagulation Combined with Ca(OH)<sub>2</sub> Addition Water Natura 2000 electrocoagulation water treatment site remediation chromium nickel |
| title | Ecologically Non-Invasive Decontamination of Natura 2000 Locality from Old Deposits of Hexavalent Chromium and Bivalent Nickel by Modular Electrocoagulation Combined with Ca(OH)<sub>2</sub> Addition |
| title_full | Ecologically Non-Invasive Decontamination of Natura 2000 Locality from Old Deposits of Hexavalent Chromium and Bivalent Nickel by Modular Electrocoagulation Combined with Ca(OH)<sub>2</sub> Addition |
| title_fullStr | Ecologically Non-Invasive Decontamination of Natura 2000 Locality from Old Deposits of Hexavalent Chromium and Bivalent Nickel by Modular Electrocoagulation Combined with Ca(OH)<sub>2</sub> Addition |
| title_full_unstemmed | Ecologically Non-Invasive Decontamination of Natura 2000 Locality from Old Deposits of Hexavalent Chromium and Bivalent Nickel by Modular Electrocoagulation Combined with Ca(OH)<sub>2</sub> Addition |
| title_short | Ecologically Non-Invasive Decontamination of Natura 2000 Locality from Old Deposits of Hexavalent Chromium and Bivalent Nickel by Modular Electrocoagulation Combined with Ca(OH)<sub>2</sub> Addition |
| title_sort | ecologically non invasive decontamination of natura 2000 locality from old deposits of hexavalent chromium and bivalent nickel by modular electrocoagulation combined with ca oh sub 2 sub addition |
| topic | Natura 2000 electrocoagulation water treatment site remediation chromium nickel |
| url | https://www.mdpi.com/2073-4441/12/10/2894 |
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