Calculating Residual Chlorine Level From 14% Sodium Hypochlorite
Calculating Residual Chlorine Level From 14% Sodium Hypochlorite
(OP)
Hi,
I'm looking to calculate the amount of 14% NaOCl solution to dose a water flow rate of 2000 m3/hr and leave 1 mg/l of residual Chlorine.
I assumed it was a simple calc, 1 mg/l = 1 ppm, so 2 litres needed an hour. At 14% that 2/.14 = 14.3 l/hr, was my thought.
However a colleague told me I need to be look at mass.
So as the 14% NaOCl has an SG of 1.2, then my 14.3 l/hr = 17.16 kg/hr and only (14.3-2) 12.3 l/hr of that is water, so 12.3 kg./hr of water leaving 4.86 kg/hr of NaoCl.
Which will actually equate to 2.43 mg/l of residual chlorine.
Is that correct, do I actually need a lot less than I'm thinking?
Thanks in advance from a mech eng!
I'm looking to calculate the amount of 14% NaOCl solution to dose a water flow rate of 2000 m3/hr and leave 1 mg/l of residual Chlorine.
I assumed it was a simple calc, 1 mg/l = 1 ppm, so 2 litres needed an hour. At 14% that 2/.14 = 14.3 l/hr, was my thought.
However a colleague told me I need to be look at mass.
So as the 14% NaOCl has an SG of 1.2, then my 14.3 l/hr = 17.16 kg/hr and only (14.3-2) 12.3 l/hr of that is water, so 12.3 kg./hr of water leaving 4.86 kg/hr of NaoCl.
Which will actually equate to 2.43 mg/l of residual chlorine.
Is that correct, do I actually need a lot less than I'm thinking?
Thanks in advance from a mech eng!





RE: Calculating Residual Chlorine Level From 14% Sodium Hypochlorite
The chlorine residual is the amount of chlorine remaining after the chlorine has reacted with whatever is in the water. I would start feeding 2 mg/l to obtain the 1 mg/l residual. Then you may reduce the 2 mg/l to optimize.
1 mg/L * 2000 m3/hr * 24 = 48 kg/day
48kg/day / 10.4% = 461.5 kg day Sodium Hypochlorite
[img https://books.google.com/books?id=JH3NBQAAQBAJ&...]