Question 2006 of 223 · California Water Treatment Operator Exam
When alum is added to water, it consumes alkalinity. If the raw water alkalinity is too low, the operator may need to add
Exactly one answer is correct.
You got of questions right. Here on the question pages nobody remembers which ones you got wrong. The trainer saves your progress and asks the mistakes again until they stick.
Or free: the 10 questions most people get wrong
Show solution
Correct answer to question 2006
- B: lime or soda ash
Explanation
Alum reacts with bicarbonate alkalinity and produces acid, which lowers pH. Lime or soda ash restores alkalinity and keeps pH in the effective range.
More questions: Water Treatment Processes
- 2007What is the purpose of a sedimentation basin?
- 2008Tube settlers or plate settlers improve sedimentation mainly by
- 2009Floc that is small and cloudy (pin floc) and does not settle well may indicate
- 2010A jar test is performed to
- 2011A sedimentation basin is 40 ft long, 20 ft wide and 12 ft deep and receives a flow of 0.5 MGD. What is its detention time?
- 2012What is the primary purpose of filtration in a water treatment plant?