The Nalgonda technique consist of what sequence of compounds addition?
- Nalgonda technique was developed at NEERI (Nagpur) in 1974 by Nawlakhe and reported by Bulusu in 1988.
- Addition sequence is Sodium aluminate (Filter alum), lime, and bleaching powder to fluoride water – followed by Filtration, Sedimentation and Flocculation.
- Also note in mixing:
a. rapid mixing - 30-60 seconds with a speed of 10-20 rpm
b. slow mixing(during flocculation) - 10-15 minutes with 2-4 rpm speed.
Filter alum , lime , bleaching powder
Lime, filter alum, bleaching powder
Bleaching powder, lime, filter alum
Bleaching powder , lime, bleaching powder