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Nara and Rebecca did a jar test on incoming plant water. The turbidity of the incoming water was found to be much lower than turbidities within the flocculator. To investigate this, they first switched the incoming turbidimeter with the second turbidimeter to see if readings were comparable. Readings were the same, so the turbidimeters appeared to be working. They also cleaned out the tube settlers to see if floc accumulation in the tube settlers caused flocs to enter the turbidimeters. This also showed no effect- turbidites were still very high within the flocculation tank. They are now considering other ways (besides the turbidimeters) to measure floc performance.
April 14, 2008
Rebecca goes to the plant to investigate a report that the plant is not running (process controller was off). She drains and cleans the tank with the help of Mark, a plant operator. Then she restarts process controller with its previous settings.