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Protecting reverse osmosis plants through water pre-treatment – Cape Business News

REVERSE Osmosis (RO) is a separation technique that is suitable for a wide range of applications, especially when salt and/or dissolved solids need to be removed from a solution. It is one of the most common types of water treatment.
According to Anelia Hough, water treatment consultant at Allmech, South African manufacturer of boilers and supplier of water treatment components, there are several factors to be considered when selecting an RO system: the customer’s capacity requirement (i.e. water usage), the daily production capacity of the system, and the percent rejection for specific contaminants in the source water.
Common issues with RO plants
“Factors that can affect a RO system’s performance include temperature, operating pressure, back pressure, the equilibrium effect/TDS creep, percent recovery, and, of course, the RO membrane’s permeate production and percent rejection ratings,” says Hough. 
The most common issues in RO plants include:
Pre-treatment can help to avoid these problems, and Hough says there are various options available. 
Pre-treatment options
“When selecting a pre-filter, users should always look for a verified efficiency rating next to the micron size on the filter’s technical data sheet,” says Hough. 
“It’s also important to clean the RO membrane regularly,” says Hough. “This involves low and high pH cleaners to remove contaminants from the membrane. We address scaling with low pH cleaners and organics, while colloidal and biofouling are treated with a high pH cleaner.”
Allmech offers the complete range of pre-treatment and RO membrane maintenance solutions for RO plants, including filtration systems, softeners, antiscalants, chemicals and other consumables.
For more information, visit www.allmech.co.za

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