WASTEWATER
By Rick Lallish
What test is done on influent and effluent samples to determine the volume of solids removed in clarifiers or ponds? What apparatus is used to run this analysis?
A. Total suspended solids, cruciblesB. Acid-to-alkalinity, beakersC. Settleable solids, Imhoff conesD. Settleability, settleometers
ANSWER: C. The settleable solids test is done using the Imhoff cones. The test measures the volume of settleable solids in one liter of sample that settles to the bottom in a one-hour period. The test may be done on influent or effluent and in clarifiers or settling tanks. The test should not be confused with the settleability test
