IV 1.4.3. Chemical addition in proportion to the water supply
The quantity of the chlorine added is determined by the corresponding responsible
man in each single case. If no instruction has been given, we recommend to adjust
chlorination of the water having a chlorine excess of
0.5 - 1 mg Cl
2
/l.
The following mentioned common chlorinous chemicals are used:
1. Chlorine bleaching solution
chlorine contents approx. 12 %
(sodium hypochlorite)
(take care on temperature, gas evolution)
2. Chloramin
chlorine contents approx. 28 %
3. HTH-chlorine (C8 powder)
chlorine contents approx. 60 % - 65 %
(calcium hypochlorite)
If a chlorine addition of 1 mg/l is demanded and an operation of the drinking water
purifier with a capacity of 6 m³/h, the chlorine quantity to be added per hour would
be 6 g Cl
2
/h. The flow rate meter has a measuring range of 0.5 - 5.4 l/h.
The dilution ratio of the chemical solution has been chosen in such a way that a
chlorine quantity of 1 mg/l is added, if a flow rate of 1 l/h is adjusted at the control
valve. The ratio between adjusted flow rate and dosing quantity remains the same at
each adjustment.
For example: demanded chlorine addition of
0.5 mg Cl
2
/l = 0.5 l/h at adjusting valve
or
2.5 mg Cl
2
/l = 2.5 l/h at adjusting valve
If the drinking water purifier is operated with a lower capacity, the dosing capacity
reduces in the same ratio (
∆
p).