rev.1.1 Page 11-27
11.4 CLEANING PROCEDURES
Cleaning Procedure 1: Hydrochloric Acid Cleaning of Concentrate and
Electrode Chambers
This procedure provides an acid cleaning of the Concentrate and Electrode (anode and
cathode) chambers of the Stacks to clean hardness and other metallic scale.
Steps
Cleaning Setup – Concentrate and Electrode Acid Cleaning Procedure Only
• Isolate the Concentrate and Electrode loops from the Dilute loop by closing the
Concentrate Makeup valve.
• Isolate the Concentrate pump by closing the Concentrate pump suction and discharge
valves.
• Close the Concentrate Bypass valve.
• Close the Concentrate Bleed valve.
• Connect the cleaning skid discharge to the E-Cell Concentrate Inlet cleaning connection.
• Connect the E-Cell Concentrate Outlet and Electrode Outlet cleaning connections back to
the cleaning skid.
Hydrochloric Acid Solution Recirculation – Concentrate and Electrode Acid Cleaning
Procedure Only
• Make up 50 L per Stack of HCl 1.8% solution.
• Recirculate the HCl solution through the Concentrate and Electrode loops for 30 minutes
with flow ranges as during normal operation.
Final Water Rinse
Cleaning Procedure 2: Hydrochloric
Acid Cleaning of All Chambers
Cleaning Procedure 3: Sodium
Chloride / Sodium Hydroxide
Cleaning/Sanitizing
This procedure provides an acid cleaning of
all chambers of the Stacks to clean hardness
and other metallic scale.
Sodium chloride 5% / sodium hydroxide 1%
is useful for cleaning fouling due to organics
or to biological growth, and for sanitization.
It can also clean light silica scaling.
Steps Steps
Cleaning Setup Cleaning Setup
Instruction 1 Instruction 2
Instruction 7 Instruction 7
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