Selective Precipitation of Iron in Acid Mine Drainage using Iron-oxidizing Bacteria

Selective Precipitation of Iron in Acid Mine Drainage using Iron-oxidizing Bacteria

Bibliographic Details
Main Author: Timmons, John D., III
Language:English
Published: Ohio University / OhioLINK 2018
Subjects:
Civil Engineering
Environmental Engineering
Acid Mine Drainage
Remediation
Iron-oxidizing Bacteria
Selective Precipitation
Online Access:http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1525446228184635
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spelling ndltd-OhioLink-oai-etd.ohiolink.edu-ohiou15254462281846352021-08-03T07:06:47Z Selective Precipitation of Iron in Acid Mine Drainage using Iron-oxidizing Bacteria Timmons, John D., III Civil Engineering Environmental Engineering Acid Mine Drainage Remediation Iron-oxidizing Bacteria Selective Precipitation With conventional acid mine drainage remediation consisting of acid neutralization and metal sedimentation, operation and maintenance costs can be overwhelming. If the sludge, primarily iron oxide in southeastern Ohio, is effectively processed, it can be utilized as an industrial grade pigment. At many locations, however the iron content in the sludge may be below standards due to aluminum contamination. In this work, we tested precipitating iron at low pH with the aid of acidophilic iron- oxidizing bacteria to produce a pure pigment. Using acid mine drainage from seeps in southeastern Ohio, at a range of pHs and inoculated with a local bacterial consortium, metal precipitate was produced and analyzed. High-quality pigment in terms of crystal, color, and iron content could be produced at all sites with iron-oxidizing bacteria, at a pH=3.5 for all sites, and pH=4.0 at some sites. From the powdered x-ray diffraction data, it was apparent that the pigments produced from each site was primarily goethite, commonly used as a pigment by the paint industry, but did contain impurities From the metal analysis, pigments contained troubling amounts of arsenic, cadmium, chromium and lead. Carbondale, with 20% aluminum in the source water, produced 98% iron pigment at pH=3.5. The iron oxide content and iron-oxidizing bacteria relationship was not statistically significant at a LOC of 95%, as well as the relationship between pigments produced above and below the pH of 4, between sites at a pH of 3.5, between sites at a pH of 4, and between the high end pH per site and the control at the same pH. It is still unclear whether iron-oxidizing bacteria were necessary for the positive results at low pH and what the optimal pH for treatment may be, with pH=3.5 being effective at Carbondale, while pH=4.0 was not, even though it was optimal for other sites. 2018-10-01 English text Ohio University / OhioLINK http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1525446228184635 http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1525446228184635 unrestricted This thesis or dissertation is protected by copyright: all rights reserved. It may not be copied or redistributed beyond the terms of applicable copyright laws.
collection NDLTD
language English
sources NDLTD
topic Civil Engineering
Environmental Engineering
Acid Mine Drainage
Remediation
Iron-oxidizing Bacteria
Selective Precipitation
spellingShingle Civil Engineering
Environmental Engineering
Acid Mine Drainage
Remediation
Iron-oxidizing Bacteria
Selective Precipitation
Timmons, John D., III
Selective Precipitation of Iron in Acid Mine Drainage using Iron-oxidizing Bacteria
author Timmons, John D., III
author_facet Timmons, John D., III
author_sort Timmons, John D., III
title Selective Precipitation of Iron in Acid Mine Drainage using Iron-oxidizing Bacteria
title_short Selective Precipitation of Iron in Acid Mine Drainage using Iron-oxidizing Bacteria
title_full Selective Precipitation of Iron in Acid Mine Drainage using Iron-oxidizing Bacteria
title_fullStr Selective Precipitation of Iron in Acid Mine Drainage using Iron-oxidizing Bacteria
title_full_unstemmed Selective Precipitation of Iron in Acid Mine Drainage using Iron-oxidizing Bacteria
title_sort selective precipitation of iron in acid mine drainage using iron-oxidizing bacteria
publisher Ohio University / OhioLINK
publishDate 2018
url http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1525446228184635
work_keys_str_mv AT timmonsjohndiii selectiveprecipitationofironinacidminedrainageusingironoxidizingbacteria
_version_ 1719454004485816320

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