Fundamentals; Chlorine Dioxide For Water Treatment; Generation Of Chlorine Dioxide - GRUNDFOS ALLDOS Oxiperm C 164 Series Operation And Service Manual

Oxiperm 164 150-2500 g en
4

Fundamentals

4.1 Chlorine Dioxide for Water
Treatment
4.1.1 Generation of Chlorine
Dioxide
15.710010-V5.0
Properties of chlorine dioxide
❏ Strong and fast oxidation and disinfection agent
❏ Applications in the treatment of drinking, service, cooling and waste water
❏ Chemically unstable compound
- Can explosively decompose into chlorine and oxygen when heated
- Must be generated on site as required since storage in cylinders is
not possible
➜ Observe notes on avoidance of danger in Section 2.3!
Advantages of chlorine dioxide compared to chlorine
❏ Largely good to very good bactericidal, virucidal and sporicidal effects in
the complete pH range of drinking water (pH 6.5 - 9)
(the disinfecting effect of chlorine decreases with increasing pH value!)
❏ No or reduced forming of trihalogen methanes
❏ No generation of chloramines with ammonium or amino compounds
❏ Highly reduced potential for generation of organic halogen compounds of
high molecular weight
❏ Good stability in water
- Long bactericidal and bacteriostatic protection in the water network
®
The Oxiperm C 164 was specially developed for the continuous or discontinuous
generation of a chlorine dioxide (ClO
dioxide is generated according to the hydrochloric acid (HCl) / sodium chlorite
(NaClO ) procedure in line with the following stoichiometric equation:
2
5 NaClO + 4 HCl
2
Sodium chlorite Hydrochloric acid
WARNING
!
The reaction time is approx. 10 minutes (in agreement with the German directive
DVGW, worksheet W 224).
) solution for water disinfection. The chlorine
2
4 ClO +
2
Chlorine dioxide Sodium chloride Water
The Oxiperm ® C 164 is used with 33 % hydrochloric
solution and 24,5 % sodium chlorite solution and a
predefined quantity of dilution water.
If undiluted, the components 33 % hydrochloric solution
and 24,5 % sodium chlorite solution will generate an
explosive concentration!
Therefore, the components 33 % hydrochloric solution
and 24,5 % sodium chlorite solution may only be used
in the Oxiperm ® C 164 with a predefined quantity of
dilution water.
5 NaCl + 2 H O
2
13