VI.
RO CLEANING & SANITIZATION PROCEDURES
Page - 32
C)
Cleaning
1)
Required Cleaning Equipment
A Reverse Osmosis cleaning skid should contain the following components:
CAUTION
All the components chosen for the construction of a Reverse Osmosis cleaning
skid are to be compatible with the cleaning chemicals to be utilized.
Cleaning Tank -
The cleaning tank should be capable of holding a cleaning
fluid volume in excess of the volume required to fill the maximum number of
Reverse Osmosis vessels which will be cleaned at one time, and associated
piping.
Cleaning Pump -
The pump chosen to provide fluid recirculation for cleaning
should be properly sized to produce the flow rate presented in Table 13 for
each membrane vessel to be cleaned. If more than one membrane vessel is to
be cleaned at one time, multiply the flow listed below by the appropriate
number of vessels to be cleaned in parallel. Membranes may be cleaned in
series, as long as each component of the series contains the same number of
vessels in parallel.
Table 13: Cleaning pump flow and pressure requirements.
Membrane Diameter (in)
Flow (gpm)
Pressure (psig)
2-1/2"
3-5
60
4"
8-10
60
8"
30-40
60
Cleaning Filter -
The cleaning filter should be sized sufficiently to handle the
full cleaning flow, and have a removal rating of at least 5 micron.
Heater/Temperature Controller (Optional) -
Cleaning procedures are
generally more effective when performed at an elevated temperature.
NOTE
Do not exceed the maximum rated temperature of the reverse osmosis
membranes. See Section X.
Instrumentation -
The Reverse Osmosis cleaning system should employ
appropriate instrumentation so that cleaning pressure, temperature and flow
rate may be monitored and adjusted.
Water Quality -
Water utilized to dilute chemical cleaning solution should be
Reverse Osmosis permeate quality
2)
Cleaning Frequency Guidelines