Stefan Bischof, Environmental Studies
Brett Kortuem, Environmental Studies
Scott Gullicksrud, Environmental Studies

Abstract: Colloids and nano-particles are important because of their role in almost all natural and industrial processes.  The objective of this project is to examine the absorption potential of bentonite-starch micro-aggregates in the removal of organic compounds from aqueous solutions.  Micro-aggregates of different bentonite-starch ratios will be prepared and tested on absorption of aromatic organic compound Methylene Blue C₁₆H₁₈ClN₃S.  Methylene Blue is used as: a redox indicator, a dye in staining procedures, a medication in treatment of methemoglobinemia, and in some other medical uses.  This project was made possible through the Minnesota Space Grant Consortium and the Bemidji State University Center for Environmental, Earth, and Space Studies Funding.

Abstract: Colloidal bentonite-xanthan micro-aggregates have long been an interest to scientists and engineers searching for inexpensive adsorbents for removal of pollutants from waters. Adsorption experiments will be performed in batch mode for up to 24 hours. Colloidal micro-aggregates will be prepared at different bentonite-xanthan ratio. The efficiency of methylene blue adsorption of bentonite-xanthan micro-aggregates will be estimated spectrophotometrically. This project was made possible through Minnesota Space Grant Consortium and Center for Environmental, Earth, and Space Studies funding.

Abstract: Huge amounts of detergents and surfactants are used by households and industry. The objective of this study was to test potential toxicity of sodium dodecyl sulfate (SDS), hexadecyl trimethyl ammonium bromide (HTAB), Triton X-100, and their mixtures on Chlorella vulgaris. SDS and Triton X-100 do not have negative effects on Chlorella growth within range of tested concentrations. HTAB, alone or in mixtures with SDS and Triton X-100, reduces Chlorella growth by more than 50% at environmentally significant concentrations. This project was made possible through Minnesota Space Grant Consortium and Center for Environmental, Earth, and Space Studies funding.