Biological Nutrient Removal Theories and Design

Abstract

Flocculation Method: Add 1 ml of 100 g/l zinc sulfate solution to a 100 ml waste water sample and mix vigorously with a magnetic stirrer for 1 minute. Adjust the pH to approximately 10.5 with a 6 M sodium hydroxide solution. Settle quiescently for a few minutes. Withdraw the clear supernatant with a pipette and pass through a 0.45 µm membrane filter. Measure the COD on the filtrate.