Document Type

Thesis - Open Access

Award Date


Degree Name

Master of Science (MS)


Civil Engineering

First Advisor

Dwayne A. Rollag


This thesis is part of an investigation to determine the feasibility of using ozonation to control odors from the Fairmont municipal water supply. The primary source of water for Fairmont is

Budd Lake. Odors develop in this lake water from the decomposition of organic matter such as algae and vegetation. Ozone was applied to the water at dosages of approximately 0.5, 1, 2, 4, 8, 12, 16, 20 and 24 mg/1 at contact times of 2.5, 5, 20 and 30 minutes using a continuous-flow ozonation pilot system Odor intensities of these waters were then measured in terms of Threshold Odor Numbers. The results indicated that ozone dosages from 1 .5 to 4 􀁩/1 at contact tines of at least 30 minute achieved suitable results under roost conditions. Dosages up to 8 mg/1 were required in a few instances. These investigations have been described in detail by Munce.

The primary objectives of the investigations described in this thesis are as follows:

1. To determine the effect of ozonation, at the recommended operating conditions for odor control on the flocculation efficiency, chlorine demand, content of organic matter and potential for the formation of trihalamethanes of the water.

2. To determine if any correlation exists between the ultra-violet absorbance and trihalamethane concentration of the water. A high correlation would allow the relatively inexpensive absorbance analysis to be used instead of the relatively expensive trihalamethane analysis to estimate the trihalamethane content of the water.

3. To determine the estimated construction and operating costs of ozonation facilities for odor control in Fairmont.

Library of Congress Subject Headings

Water -- Purification -- Ozonization
Water treatment plants -- Minnesota -- Fairmont



Number of Pages



South Dakota State University