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 A Visual/Olfactory Assessment Tool that Accurately Predicts the Operational Status of Aerobic Treatment Units When Compared to Biochemical Oxygen Demand and Suspended Solids Effluent Sample Results
Paul Rosile
Item Number: NRL2006AC-6
Shipping Weight: 0lbs. 0oz.
Price: $20.00
This study provided sufficient evidence that there was no significant difference between a Visual Olfactory (V/O) assessment method and effluent laboratory tests of Aerobic Treatment Units (ATU’S). The study was needed to help answer a policy debate within the Environmental Health (EH) Division of the Franklin County Board of Health (BOH) on the future use of a Dissolved Oxygen (DO) meter as a measure of performance of (ATU’s). A sample of 50 ATU’s from a population of 3900 were tested using a V/O assessment, a DO test of the mixed liquor, and a gold standard test of effluent quality by a certified laboratory. The V/O assessment measured the odor and color of the mixed liquor, the mechanical function of the aeration motor, and the odor and color of the effluent from the discharge point or an observation port. Biochemical Oxygen Demand (BOD5) and Total Suspended Solids (TSS) were tested and both had to pass Ohio’s minimum effluent quality standards. A statistical comparison between the V/O method and the gold standard test showed no significant difference between the two methods. Confounders and bias were carefully controlled to increase validity of the results. The study will help bring resolution to a policy debate and will assist the BOH in the provision of the most cost effective and cost efficient services to protect public health and environmental quality.