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Publikationstyp
Wissenschaftlicher Artikel
Erscheinungsjahr
2020
Pilot scale hexavalent chromium removal with reduction, coagulation, filtration and biological iron oxidation
Pilot scale hexavalent chromium removal with reduction, coagulation, filtration and biological iron oxidation
Herausgeber
Quelle
Separation and purification technology
253 (2020)
253 (2020)
Schlagwörter
Trinkwasseraufbereitung
Zitation
DIPPON-DEISSLER, Urs, Daniel MAHRINGER, Aki Sebastian RUHL und Sami Sofiene ZERELLI, 2020. Pilot scale hexavalent chromium removal with reduction, coagulation, filtration and biological iron oxidation. Separation and purification technology [online]. 2020. Bd. 253 (2020). DOI 10.60810/openumwelt-1598. Verfügbar unter: https://openumwelt.de/handle/123456789/4194
Zusammenfassung englisch
Cr(VI) is identified as highly toxic, therefore a far-reaching limitation of total chromium or Cr(VI) in drinking water was proposed by the Germany Environment Agency. There is a lack in efficient treatment processes to reach Cr(VI) concentrations below 1 (my)g L-1. In this study, the combination of chemical reduction, coagulation and filtration (RCF) was further developed by adding biological iron removal as filtration step (RCbF). The aim of this enhancement was to reach lower effluent concentrations and a higher robustness regarding process parameters. The effectiveness of Cr(VI) removal was investigated using two-stage pilot-scale waterworks. RCbF reaches Cr(VI) effluent concentrations below 0.5 (my)g L-1 despite variations of pH, filtration velocity, or Cr(VI) influent concentrations. Fe(II) dosage and hence molar excess of Fe(II) over Cr(VI) was identified as the key parameter for Cr(VI) removal. Low oxygen dosage for biological iron removal improved the efficiency of RCbF compared to RCF. The co-precipitation of Cr(III) and Fe(III) as solid solution in the supernatant of the filter bed was promoted by low oxygen concentrations making Cr(VI) the preferred oxidant. RCbF was shown to be a suitable treatment process for reaching a low limit value for total chromium or Cr(VI) concerning technical feasibility. © 2020 The Authors.