WATER PLANT OPERATOR TRAINING PROGRAM

Definition: anything which intereferes with the passage of light through a sample of water. An optical property Units of measurement NTU (Nephelometric Turbidity Units) A good turbidimeter is a nephelometer - measures scattered light. Current MOW objective < NTU Why are we interested in turbidity? 1. Relationship with disinfection. 2. Quick analysis and continuous analysis. 3. A good measurement of the working effectiveness of a WTP. How can we reduce turbidity? 1. Coagulation, Flocculation and Sedimentation. 2. Filtration Turbidity Measurement Techniques Grab Samples keep cells clean and unscratched, no finger prints mark each cell and insert in the sample chamber with same orientation a thin, uniform layer of silicone oil applied to cell to minimize effect of scratches air bubbles? degass with rubber stopper and syringe Calibration calibrate with or against known standards