Regression Analysis of BOD5 and COD with TOC for Domestic Wastewater

Abstract

Presently, the available means for ascertaining the true potential of organic matter in the form of bio-chemical oxygen demand (BOD5) and chemical oxygen demand (COD) is time consuming and imprecise. To overcome these time based difficulties, an attempt is being made to use a faster mode of assessment by establishing a relationship between BOD and COD with total organic carbon (TOC). To accomplish the same, the domestic wastewater collected from sewage farm, Mysore, sampled over a period of 2 months was analyzed for three parameters, BOD5, COD and TOC. The best fit regression line for BOD5with COD was obtained as BOD5= +0.631 COD mg/L. While the best fit regression line for BOD5with TOC took the form, BOD5= +0.373 TOC mg/L, for COD with TOC, it was COD = +0.565 TOC mg/L. The regression lines so developed, on comparison with practical & graphical values resulted in 99% efficiency.