Reverse Osmosis, Membrane Chemical Treatments

Membrane Chemical Treatments

PermaClean® PC-99

Membrane Cleaning Compound

Product Benefits

• Suitable for use with polyamide thin film composite and cellulose acetate membranes
• Concentrated liquid product for ease of use
• Effective cleaner, for removing organic deposits from membranes
• Has a wide range of applications and compatibility with many other cleaners
• Has efficacy in reducing biofouling

A regular maintenance and cleaning programme can provide a significant return on investment by extending system run time, preventing membrane degradation, maintaining lower feed pressures and extending the membrane's life.

PermaClean PC-99 should always be used as recommended by the membrane manufacturer with respect to pH, temperature, flow rate and differential pressure.

General Description

For typical chemical and physical properties, refer to the PermaClean PC-99 Material Safety Data Sheet.

Treatment and dosage requirements

Chlorine-free product water should be used to make up a 1.0 ­ 2.0% by volume solution of PermaClean PC-99, which may be pH adjusted by the addition of sodium hydroxide or good quality hydrochloric acid depending whether an alkaline or acidic clean is needed. The cleaning solution should be circulated through the membrane system at 25 to 30°C, and at a flow rate and pressure designated by the membrane or equipment manufacturer. Intermittent circulation and soaking, alternating every 15 minutes, for a total of 3 ­ 5 hours, is recommended. Foaming may be expected in some designs of CIP tank and pipework. Product Bulletin PM­PC-99

Principal Uses

PermaClean PC-99 is a liquid blend of dispersants and inorganic builders with an amphoteric surfactant. Specially developed as an alkaline cleaning formulation for removing organic debris and biofouling from RO and UF membranes, PermaClean PC-99 does not contain any amino carboxylic acid sequestrants.

During normal operation, reverse osmosis and other membranes can become fouled, which greatly reduces the efficiency of the system. Deposits build up on the membrane until they cause a reduction in normalised permeate flow, increases in differential pressure and losses in salt rejection. The effects of fouling can lead to poor water quality, loss in production, unscheduled downtime and premature membrane replacement.

This cleaning cycle may have to be repeated in the case of heavily fouled membranes. It is recommended that the cleaning be carried out at the maximum temperature allowed by the membrane manufacturer. Before returning the system to service, the operator must ensure that any residual cleaning product is removed from the membrane surface by thorough flushing. Monitoring the pH of the concentrate until it returns to the same pH as the influent water is one way of doing this.

Handling

Read the label and Material Safety Data Sheet for complete handling information before using this product.

Remarks

For more information please contact Derwent Water Services