rev.1.1 Page 11-25
Cleaning Setup
• Isolate the E-Cell system from upstream and downstream by closing the E-Cell System
Dilute Feed Inlet, Dilute Product Outlet, and Dilute Rinse Outlet valves.
• Connect the cleaning skid discharge to the E-Cell Dilute Feed Inlet cleaning connection.
• Connect the E-Cell Dilute Product Outlet, Concentrate Bleed, and Electrode Outlet
cleaning connections back to the cleaning skid.
Instruction 1: Hydrochloric Acid Solution Recirculation (Low pH Cleaning)
• Drain the cleaning skid and E-Cell skid.
• Make up 50 L per Stack of HCl 1.8% solution.
• Recirculate the HCl solution through the Dilute, Concentrate and Electrode loops for 30
minutes.
o The E-Cell system will run with flow ranges as during normal operation, using the
Concentrate pump, but with no current applied to the Stacks.
Use: To clean hardness and other metallic scale. In procedure 1, only the Concentrate and
Electrode chambers of the stack are cleaned.
Instruction 2: Sodium Chloride / Sodium Hydroxide Solution Recirculation
(High pH Cleaning)
• Drain the cleaning skid and E-Cell skid.
• Make up 25 L per Stack of NaCl 5% + NaOH 1% solution.
• Recirculate the NaCl+NaOH solution through the Dilute, Concentrate and Electrode loops
for 30 minutes.
o The E-Cell system will run with flow ranges as during normal operation, using the
Concentrate pump, but with no current applied to the Stacks.
Use: Sodium chloride with sodium hydroxide is useful for cleaning fouling due to organics or
to biological growth, and for sanitization. It can also clean light silica scaling.
Instruction 3: Halane (1,3-dichloro-5,5-dimethyl hydantoin) Solution
Recirculation (Mild Oxidizing Sanitization/Cleaning)
• Drain the cleaning skid and E-Cell skid.
• Make up 25 L per Stack of halane 0.05% solution (12.5 g halane in 25 L of water.)
o Halane is sparingly soluble. Completely dissolve the halane before proceeding to
recirculate the cleaning solution.
• Recirculate the halane solution through the Dilute, Concentrate and Electrode loops for
30 minutes.
o The E-Cell system will run with flow ranges as during normal operation, using the
Concentrate pump, but with no current applied to the Stacks.
Use: Halane, a widely used source of chlorine, is useful for cleaning and sanitizing high-purity
water treatment equipment. This is an oxidizing cleaning solution which is effective primarily
as a biocide against biofouling and secondarily a cleaner against organic fouling. Due to its
oxidizing power, this cleaning solution should be used infrequently and the directions for its
use followed closely.
To Next Page
Loading...
