Off-campus South Dakota State University users: To download campus access theses, please use the following link to log into our proxy server with your South Dakota State University ID and password.

Non-South Dakota State University users: Please talk to your librarian about requesting this thesis through interlibrary loan.

Document Type

Thesis - University Access Only

Award Date


Degree Name

Master of Science (MS)

Department / School

Civil Engineering

First Advisor

Dwayne A. Rollag


Six ozone pilot plant water quality studies were performed on water supplies of five Eastern South Dakota Cities and one Southern Minnesota City. The water supplies for these cities included groundwater at Brookings and Sioux Falls, South Dakota, river water at Huron and Yankton, South Dakota, and lake water at Watertown, South Dakota and Fairmont, Minnesota. The six study sites were investigated by researchers at South Dakota State University, Brookings, South Dakota, and the results are reviewed in this paper. The objective of the studies was to determine optimum ozone dosages and contact times for reducing odors, chlorine demand, organic carbon, trihalomethanes, iron, and manganese. Tests were also done to assess flocculation effects on those plants that depended on settling. The results were utilized to establish capital and operating costs. Test parameters used in the studies included: ozone dosage and contact time, pH, turbidity, odor, temperature, chlorine, absorbance, color, iron, manganese, chemical oxygen demand (COD), and total organic carbon (TOC). The results of ozonation on the varying water supplies were found to be highly dose dependent. Ozonation generally reduced odors, chlorine demand, TOC, trihalomethane formation, and COD levels. Ozonation oxidized iron and manganese, creating fine particle precipitates. The cost of ozonation varied from 6.7 to 33.4 cents per 1,000 gallons of water treated.

Library of Congress Subject Headings

Water-supply -- South Dakota -- Purification
Water-supply -- Minnesota -- Purification
Water quality



Number of Pages



South Dakota State University