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Filtering by: Degree Field Environmental Engineering Remove constraint Degree Field: Environmental Engineering Non-Academic Affiliation Oregon State University. Graduate School Remove constraint Non-Academic Affiliation: Oregon State University. Graduate School

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  • Visualization and characterization of biofilm spatial distribution in porous media using x-ray computed microtomography

    Creator:
    Iltis, Gabriel C.
    Abstract:
    This work focuses primarily the development of methods for imaging microbial biofilms in opaque porous media using x-ray computed microtomography (CT). Two methods for evaluating biofilms in porous media are presented. The first focuses on the addition of silver-coated, hollow glass microspheres to a biofilm-containing micro-model. The silver-coated microspheres affix...
    Resource Type:
    Dissertation
    Full Text:
    Gabriel C. Iltis for the degree of Doctor of Philosophy in Environmental Engineering presented on

  • Transformation of Phenanthrene by Mycobacterium sp. ELW1 and the Formation of Toxic Metabolites

    Creator:
    Schrlau, Jill E.
    Abstract:
    The ability of Mycobacterium sp. ELW1, a novel microbe capable of alkene oxidation, to co-metabolize phenanthrene (PHE) was studied. ELW1 was able to completely co-metabolize PHE, at different concentrations below its water solubility limit, in an aqueous environment. The alkene monooxygenases in ELW1, used to initiate oxidation of PHE, were...
    Resource Type:
    Masters Thesis
    Full Text:
    the degree of Master of Science in Environmental Engineering presented on September 20, 2016

  • Transformation of Carbon Tetrachloride and Chloroform by Trichloroethene Respiring Anaerobic Mixed Cultures and Supernatant

    Creator:
    Vickstrom, Kyle E.
    Abstract:
    Carbon tetrachloride (CT) and chloroform (CF) were transformed in batch reactor experiments conducted with anaerobic dechlorinating cultures and supernatant (ADC+S) harvested from continuous flow reactors. The Evanite (EV-5L) and Victoria/Stanford (VS-5L) cultures capable of respiring trichloroethene (TCE), 1,2-cis-dichloroethene (cDCE), and vinyl chloride (VC) to ethene (ETH) were grown in continuous...
    Resource Type:
    Masters Thesis
    Full Text:
    APPROVED: Major Professor, representing Environmental Engineering Head of the School of

  • The Vadose Zone as a Hyporheic Carbon Source : A Look at Temporal Trends in Hyporheic Zone pCO₂

    Creator:
    Brandes, Jason B.
    Abstract:
    Stream chemistry studies conducted in the forested Watershed 1 of the HJ Andrews Experimental Forest show a contribution of CO2 from the hyporheic zone. Hyporheic CO₂ concentrations, measured as pCO₂, have a seasonal trend as well as a responsiveness to storm events. Concentrations are highest at the end of the...
    Resource Type:
    Masters Thesis
    Full Text:
    Science and Environmental Engineering presented on June 12, 2017. Title: The Vadose Zone as a

  • The effect of silver ions and nanoparticles on biofilms and planktonic cultures of Nitrosomonas europaea

    Creator:
    Giska, Jonathan R.
    Abstract:
    Due to the effective antimicrobial properties of silver nanoparticles they represent a significant proportion of all consumer-­‐related nanomaterials. The introduction of silver nanoparticles from these products into domestic and industrial wastewater streams poses potential complications for biological treatment systems. A critical component of biological treatment that is extremely sensitive to...
    Resource Type:
    Masters Thesis
    Full Text:
     Science  in  Environmental  Engineering   presented  on  May  28,  2013   Title

  • Reach scale sampling metrics and longitudinal pattern adjustments of small streams

    Creator:
    Robison, E. George
    Abstract:
    Several types of channel morphology measurement parameters used to characterize fish habitat of small streams are refined, developed and evaluated in terms of their accuracy, precision, and sensitivity to disturbance. Data for 74 stream reaches in Oregon and Alaska are used in analysis. Over half the reaches are from a...
    Resource Type:
    Dissertation

  • RANS and LES predictions of turbulent scalar transport in dead zones of natural streams

    Creator:
    Drost, Kevin J.
    Abstract:
    Natural stream systems contain a variety of flow geometries which contain flow separation, turbulent shear layers, and recirculation zones. This work focuses on streams with dead zones. Characterized by slower flow and recirculation, dead zones are naturally occurring cutouts in stream banks. These dead zones play an important role in...
    Resource Type:
    Masters Thesis
    Full Text:
    of Master of Science in Mechanical Engineering and Environmental Geology presented on June 4, 2012

  • Problems of Shape and Information in Multiscale Modeling of Transport Phenomena

    Creator:
    Ostvar, Sassan
    Abstract:
    This work is a compilation of problems that deal with multiscale analysis of transport phenomena in environmental systems. A common feature among the problems studied here is the presence of non-negligible microscale structure in various forms. Each problem is approached from the perspective that a macroscopic observable encodes aspects of...
    Resource Type:
    Dissertation
    Full Text:
    the degree of Doctor of Philosophy in Environmental Engineering presented on March 1 2017. Title

  • Physiochemical mechanisms for the transport and retention of technetium

    Creator:
    Jansik, Danielle P.
    Abstract:
    Understanding the transport and retention of radionuclides in the environment is important for protecting freshwater supplies and minimizing impact to biologic systems. Technetium-99 (Tc⁹⁹) is a radionuclide of interest due to its long half-life (2.13 x 10⁵ years) and toxicity. In the form of pertechnetate (TcO₄⁻), Tc is expected to...
    Resource Type:
    Dissertation
    Full Text:
    Philosophy in Environmental Engineering presented on January 11, 2013. Title: Physiochemical Mechanisms

  • Novel Approaches to Evaluate the Environmental Impacts of Nanomaterials

    Creator:
    Wu, Fan
    Abstract:
    Numerous studies have shown that some nanomaterials are highly toxic to aquatic organisms and can potentially disrupt overall community health; however, current methods to evaluate the nanomaterials environmental impacts rarely consider the environmental realism or provide sufficient detail on the impact at the community level. Here we demonstrate three approaches...
    Resource Type:
    Dissertation
    Full Text:
    DISSERTATION OF Fan Wu for the degree of Doctor of Philosophy in Environmental Engineering presented on