Can a drinking water source be too clean to use a conventional plant for treatment?
asked 30 July 2018 asked by FMacy (100 points)
Do you have filtration after the sedimentation step? If that is the case you can bypass the flocculation and sedimentation units when times of very low turbidity and go directly to the sand filter units. in theory, you can treat low turbidity and low alkalinity water with flocculation and sedimentation treatment, but you would have to increase the Alum dose a lot and add Soda Ash to have a good level of alkalinity. And the end you would get maybe 1 NTU. In those cases when you have turbidity lower than 10 NTU you can go to a San Filter and run to 8 hours without the need of backwashing.