Mode Of Operation Of System - GRUNDFOS ALLDOS Oxiperm C 164 Series Operation And Service Manual

5.3 Mode of Operation of System

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When starting the compact system in normal mode, the solenoid valve (item 3.1)
opens up, and dilution water flows to the mixer (item 5), see Fig. in Section 5.1.
The flow of dilution water is monitored by an impeller flowmeter (item 3.2).
The two dosing pumps (items 1.1 and 2.1) supply 33% hydrochloric acid and 24.5%
sodium chlorite solution respectively into the reactor (item 4.1), where the dilution
water pump (item 10) dilutes the 33% hydrochloric acid before the two chemicals
react. The flow quantities of the chemicals and the dilution water are monitored by
the dosing controllers (items 1.3, 2.3 and 10.2).
The reaction between sodium chlorite and hydrochloric acid results in a chlorine
dioxide solution with a concentration of 20 g / l in the reactor (4.1). The dwell time
in the reactor is approx. 10 minutes.
In the subsequent mixer, this solution is diluted down to a concentration of max.
3,3 g ClO / l depending on the system size and performance setting, and passed
2
on to the injector.
The system is switched off immediately if one of the dosing controllers or the
impeller flowmeters detects a low flow.
!
WARNING
NOTE
Chlorine dioxide is a toxic gas.
Hydrochloric acid and sodium chlorite are highly
corrosive chemicals which must be handled properly.
Installation and operating personnel must therefore be
acquainted with the regulations concerning the handling
of chlorine dioxide, hydrochloric acid and sodium
chlorite.
In Germany, the accident prevention regulations UVV
of April 1979 are applicable.
Protection units should be provided in addition, such as
e.g. separate protection troughs for the hydrochloric
acid and sodium chlorite tanks, and protective clothing
for operators.
Furthermore, the specified warning signs, danger
information and first aid information must be positioned
at the specified points.
A set of warning signs for the chlorine dioxide system
in accordance with the specifications is available under
Order No. 515-662.
You can find further general information for operation of
a chlorine dioxide system in:
Accident prevention regulations: "Chlorination of
water" (VGB 65 or GUV 8.15) (German)
Carl Heymanns Verlag, Cologne
Directive on dangerous working materials
(ArbeitsstoffV) in latest edition (German)
DIN 19617 "Sodium chlorite solution for water
treatment; technical conditions of delivery" (German)
DIN 19610 "Hydrochloric acid for water treatment"
(German)
"Chlorine dioxide for water treatment"
DVGW directive, worksheet W 224 (German)
Oxiperm 164 150-2500 g en
15.710010-V5.0