Arsenic Removal from Acidic Liquors by Biogenic and Chemically Produced Schwertmannites
As and Fe in acidic liquors, such as acid mine drainage, require treatment before release to the environment. Adsorption or co-precipitation of As with biogenic and chemically produced Fe-containing settleable precipitates, i.e. schwertmannites was studied. Autotrophic Leptospirillum ferrooxidans and heterotrophic mixed culture of Alicyclobacillus tolerans and Acidiphilium cryptum oxidized Fe at rates from 18 to 23 mg/(L.h) in the presence of 5 and 10 mg/L As 3+ , and both cultures tolerated up to 100 mg As 3+ /L although Fe 2+ oxidation rates decreased to 3-4 mg/(L.h). At Fe/As ratios of ≥20, As removal efficiencies of ≥95% were obtained by co-precipitation with Fe 3+ at pH 3.5-4.5. Schwertmannite precipitates produced by the heterotrophic culture formed crystals and were, thus studied for adsorptive removals of As 3+ and As 5+ and compared with chemically synthesized schwertmannites. As 3+ (100 mg/L) adsorption onto biogenic and chemical schwertmannite were 25 and 44%, respectively, at pH 4. At 100 mg As 5+ /L, adsorption capacity and efficiency onto biogenic schwertmannite were 47 mg/g and 50%, respectively. At 300 mg As 5+ /L, adsorption capacity and efficiency onto chemical schwertmannite were 169 mg/g and 56%, respectively. In summary, biogenic schwertmannite has potential for As removal via co-precipitation with Fe 3+ at pH 3.5-4.5 and Fe/As ratios of ≥20 due to low production cost from AMD
Year of publication: |
[2022]
|
---|---|
Authors: | NURAL YAMAN, Belma ; Vatansever, Özkan ; Demir, Emir Kasım ; Aytar Çelik, Pinar ; Puhakka, Jaakko A. ; Şahinkaya, Erkan |
Publisher: |
[S.l.] : SSRN |
Subject: | Chemieindustrie | Chemical industry |
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