bioremediation of arsenic contaminated water

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Bioremediation of Arsenic Contaminated Water. Sarah Moore Lucia Rodriguez- Freire , Dr. James Field, and Dr. Reyes Sierra Department of Chemical and Environmental Engineering The University of Arizona. 23 rd Annual Arizona Space Grant Consortium Symposium 
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Bioremediation of Arsenic Contaminated Water Sarah Moore, Lucia Rodriguez-Freire, James Field, and Reyes Sierra Chemical and Environmental Engineering Department, University of Arizona SYMPOSIUM NAME PLACE DATE

Bioremediation of Arsenic Contaminated Water23rd Annual Arizona Space Grant Consortium Symposium The University of Arizona, Tucson, AZApril 12th, 2014Sarah MooreLucia Rodriguez-Freire, Dr. James Field, and Dr. Reyes SierraDepartment of Chemical and Environmental EngineeringThe University of ArizonaOutlineArsenic Background and TheoryProject ObjectivesExperimental MethodsResultsConclusionsContinued Work

Arsenic BackgroundArsenic (As) is an important water contaminantToxicityCarcinogenicityWidespread occurrenceNatural and Industrial

Source: http://www.water-research.net/arsenic.htm3The Arsenic CycleArsenic occurs in several forms: Dissolved cations (AsIII and AsV), elemental As, organic As, arsenic sulfide mineralsMicroorganisms play an important role in the arsenic cycle

AsV AsIIITrimethylarsine Water

4Arsenic Sulfide Biomineralization

Source: Lucia Rodriguez-Freire 5ObjectivesInvestigate the possibility of bioremediation of arsenic contaminated water

Process of anaerobic biomineralization

Explore implementation of continuous biological reactors

MethodsAsV, SO42-, foodAsV, food,NO SO42-AsV AsIII

SO42- S2-

AsIII+ S2-As2S3 (Solid)AsV AsIII

Complete Treatment: BiomineralizationControl: No BiomineralizationS2-, AsIII (reduced amount), byproductsAsIII, byproducts 7

Day 0Day 154Results8Electron Microscope Image

Source: University Spectroscopy and Imaging Facility (USIF)9Arsenic Concentration: Complete Treatment10Arsenic Concentration: Control11Percent Arsenic Removal12ConclusionsArsenic-sulfide minerals can be formed in anaerobic continuous bioreactorsAn average of 92% of the total As was removed in the complete treatmentArsenic biomineralization can be used to remediate arsenic contaminated water

Continued WorkLong term mineral stability experimentsAt pH = 6.5, less than 1% of mineral dissolvedAt pH = 7.5, significant amount of mineral dissolvedDesign of bioremediation system that implements biomineralizationIn situPump and treatPermeable Reactive Barrier

14Thank You!

Special thanks to my mentors, Lucia Rodriguez-Freire, Dr. James Field, and Dr. Reyes Sierra, the UA Chemical and Environmental Engineering Department, University Spectroscopy and Imaging Facility (USIF), Robert Root (UA) and Stanford Synchrotron Radiation Laboratory (SSRL), NASA and the Arizona Space Grant Consortium.15Extra Slides for QuestionsReactor SpecificsComplete Treatment Influent1 mM AsV1.5 mM SO42-4.5 mM EthanolMinerals

Control Influent 1 mM AsV4.5 mM EthanolMinerals

Analytical TechniquesEthanol and Acetate: Gas ChromatographySO42- and AsV: Ion Chromatography Sulfide: Colorimetric MethodsTotal As: Inductively Coupled Plasma

In Situ Bioremediation

Source: Lucia Rodriguez-Freire Permeable Reactive Barrier Bioremediation

Source: http://eg.geoscienceworld.org/content/8/4/258/F1.expansion.html

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