Reverse Osmosis, Membrane Chemical Treatments

Membrane Chemical Treatments

PermaClean® PC-67

Membrane Cleaning Compound

Product Benifits

Suitable for use with polyamide thin film composite and cellulose acetate membranes

Effective removal of organic matter

High level of active substance

Liquid product, easy to handle and simple to apply

Principle Uses

PermaClean PC-67 has been developed for the cleaning of reverse osmosis (RO), nano-filtration (NF) and ultra-filtration (UF) membranes. Its formulation is based on an anionic surfactant and is most effective in removing colloidal and other organic matter. 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. 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.

When PermaClean PC-67 is used in conjunction with microbial control agents such as PermaClean® PC-11, PermaClean® PC-55 and PermaClean® PC-56, it is effective against biofilm. PermaClean PC-67 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-67 Material Safety Data Sheet.

Treatment & Dosage Requirement

PermaClean PC-67 cleaning solutions are made up at 1.0 ­ 2.0% by volume with chlorine-free product water and sodium hydroxide addition to give a pH of 10.5 ­ 11.5. It is recommended that warm cleaning solutions be used within the limits imposed by the membrane manufacturers. This temperature will determine the maximum cleaning pH. The duration of the cleaning cycle depends on the quantity and nature of the fouling. Although a cleaning period of 2 ­ 4 hours may be typical, an extended overnight soaking period may be necessary in the case of heavy fouling. Short periods of recirculation and soaking (~15 minute change over) are considered good practice for heavily fouled membranes. Product Bulletin PM­PC-67

World

On completion of the cleaning process, it is recommended that the membranes be rinsed with good quality water to remove any residual PermaClean PC-67. When returning the plant to service, the product water should be discarded for the first 15 ­ 20 minutes or as long as necessary to ensure it is free of the cleaning solution.

Handling

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

For more information please contact Derwent Water Systems