What is the retention time considered for the anoxic zone for the A2O process for removing phosphorus?

Which of these is true about reverse osmosis membranes?

Which of the following is not removed by activated carbon?

_____ is added to hard water to make it softer.

Calculate the recovery for the following data: Product Flow: 535 m3/h. Feed flow : 635 m3/h. Flux considered: 12 lmh

How is the permeate flux expressed mathematically?

What is the preferred regenerant in case of anion exchanger?

How can scaling be prevented?