Assessing Water Quality Characteristics of pH and Biochemical Oxygen Demand (CBOD) of Public Utility using Statistical Quality Control (SQC)

Nathaniel Bryce Blevins, Richard S. Segall, Sharanya Choppari

This paper is a continuation of previous research supervised by co-author Segall that appeared in Akarapu et al. (2016a, 2016b) at WMSCI 2016. This research studies in depth only two of the characteristics of water quality for actual 2016 data collected for a water treatment plant located in United States where the previous studies Akarapu et al. (2016a, 2016) studied five characteristics of water quality for 2014 data for the same water treatment plant. The two water quality characteristics studied in-depth with this paper with a more recent data set for the same water treatment plant are pH and Carbonaceous Biochemical Oxygen Demand (CBOD). The claim is that seasonal quadratic trend lines were the most accurate for pH, and pH must be a function of other variables such as Ammonia Nitrogen (NHS-N) and Suspended Solid Bodies (SSB). Discussions of the analyses are presented as obtained using Minitab 17 and Minitab 18.

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