Date of Award
Bachelor of Science
Paper Science and Engineering
Carleton Van Maltby
Biochemical oxygen demand (BODs) is a five-day test. Chemical oxygen demand (COD) is a two-hour test. Both measure the oxygen demand exhibited by organics in a wastewater sample.
It was proposed that if a significant correlation exists between BODs and COD, the faster and simpler COD test could be substituted for the more commonly used BODs test. Three effluent streams were chosen to test: a pulp mill stream, a paper mill stream, and a combined effluent stream. The correlation that existed between BODs and COD in the combined effluent and paper mill streams were 0.90 and 0.92 respectively. A correlation of 1.00 would be a perfect linear correlation. The correlation of BODs to COD associated with the pulp mill stream was 0.72.
These results can help a mill predict BODs in a short time allowing for the saving of money, man hours, and time. It will also provide the mill with soluble organic concentrations in their effluent streams on a regular basis.
Tuskan, Lloyd M., "Correlating BOD and COD in Paper Mill Effluent Streams" (1992). Paper Engineering Senior Theses. 544.