Masters Theses


"This thesis describes the laboratory evaluation of the benthal sludge oxygen uptake of a 6.7 acre waste stabilization pond which has served a city of 2,400 population for a period of seven years. Special emphasis is directed toward the explanation of laboratory techniques developed for this study to measure the oxygen uptake rate. The effects on oxygen consumption of temperature, nature of sludge, initial oxygen tension, and sludge consolidation are discussed. Benthal sludge samples were taken from three locations in the pond. Oxygen consumption studies were conducted in a specially designed plastic cylinder which included a novel magnetic mixing system. BOD dilution water was employed as the supernatant over the sludge. Tests were run at 10, 22, and 35 degrees centigrade. Oxygen uptake was measured using an automatic oxygen analyzer and recorded on a continuous recorder. The data were converted to mg O₂ uptake per minute per square meter of sludge surface area. At the conclusion of each test, the supernatant was withdrawn and analyzed for COD, pH, alkalanity [sic], and suspended solids. Additional oxygen consumption tests were performed on the unsettled and settled supernatants in order to evaluate the oxygen uptakes exerted by the dissolved and suspended organic materials apart from the sludge phase. Results obtained from this study indicated that the oxygen uptake bore a definite relationship with volatile solids suspended from the sludge phase. The supernatant which was siphoned off during the mixing showed an oxygen consumption rate approaching that of the supernatant-sludge system. Temperature was also observed to have a significant effect on the oxygen uptake rate. At 35 degrees centigrade the dissolved oxygen in the test chamber was exhausted within a few minutes, while at 10 degrees centigrade the same sample took several days to deplete completely the oxygen content. The effects of the oxygen tension and the sludge compaction on the oxygen uptake were also evaluated. Neither oxygen tension or sludge compaction could be shown to have a significant effect on the rate of oxygen consumption"--Abstract, Pages ii-iii.


Huang, Ju-Chang, 1941-2018

Committee Member(s)

Roberts, J. Kent, 1922-
Gale, Nord L.


Civil, Architectural and Environmental Engineering

Degree Name

M.S. in Civil Engineering


United States. Federal Water Pollution Control Administration


University of Missouri--Rolla

Publication Date



xiv, 170 Pages


© 1970 Edward Landon Niedringhaus, All rights reserved.

Document Type

Thesis - Open Access

File Type




Subject Headings

Sewage lagoons
Biochemical oxygen demand
Organic water pollutants

Thesis Number

T 2335

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