Document Type

Thesis - Open Access

Award Date


Degree Name

Master of Science (MS)

Department / School

Civil Engineering


In recent years industrial management has become increasingly aware of the advantages of processing agricultural products near the source of supply. The result has been the growth of industry in many smaller communities. This growth has increased the need for expanded waste treatment facilities. A frequently used method of expansion for many communities utilizing stabilization ponds has been the addition of a mechanically aerated lagoon located upstream from the existing ponds. Typical of this pattern, the South Dakota Department of Health recommended expansion of existing stabilization ponds at Volga. Aerated lagoons were selected to accomplish this objective. The existing stabilization ponds consist of three 7 acre cells located one mile east of Volga near the Big Sioux River. The new facilities include an outfall line and two aerated lagoons preceding the stabilization ponds. The south aerated lagoon is the larger of the two with a capacity of 825,000 gallons, a liquid depth of 10 feet, and a 40-HP surface turbine aerator. The north aerated lagoon was utilized for the investigations reported in this thesis. This lagoon had a volume of 604,000 gallons, liquid depth of 9.6 feet, and a surface-turbine aerator capable of operation at 17 or 30-HP. Volga, South Dakota, located in the East-Central-part of the state, had a population of 1,030 in 1970. The major industry in this community is a milk-drying plant, owned by Land-0-Lakes Creameries, Incorporated, Minneapolis, Minnesota. This plant produces dried milk and butter-oil from raw milk. Between 182,000 and 596,00 pounds of raw milk per 24-hour day were processed during High-Speed Run B and the Low-Speed Run whereas; during High-Speed Run A, the milk plant was not in production, serving only as a milk transfer station. The objectives of the coordinated studies were to determine the influence of mixing on organic removal efficiency, so lids levels, and cellular activity. The investigations described herein consist of ancillary studies of aerated lagoon performance at Volga. South Dakota. The primary objectives of the ancillary investigations presented herein were: 1. To estimate the total number of active organisms in the lagoon at different environmental conditions. 2. To estimate cellular activity in terms of the potential oxygen uptake rate at two different mixing levels. 3. To determine the dissolved oxygen concentrations in the lagoon at different mixing speeds, 4. To determine the distribution of solids throughout the lagoon at two different mixing speeds.

Library of Congress Subject Headings

Sewage lagoons -- South Dakota -- Volga

Sewage disposal plants -- South Dakota -- Volga

Factory and trade waste -- South Dakota -- Volga

South Dakota State University Theses



Number of Pages



South Dakota State University