Some raw feed waters contain suspended particulate material. This material is commonly sand, iron oxides, clay or elemental sulfur.
Introduction of such materials into the membrane system can cause the development of excessive system differential pressure (dP), or even complete blockage of the brine channels with the resultant reduction of permeate flow. It can also cause physical damage to the membranes themselves. This usually results in a decrease of permeate quality and reduction of membrane life. Cartridge filtration is normally a simple and cost-effective way to reduce the amount of particulate matter reaching the membrane surface.
How to Calculate Percent Recovery and What Affects it in a Membrane Treatment System?
It is important to check on the level of semi-colloidal suspended solids in the feedwater to RO systems. The level can be estimated (not measured absolutely) by the Silt Density Index or SDI test which measures the blocking rate of a 0.45 micron filter pad under controlled pressure conditions.
Unlike standard membrane equipment that attempts to accommodate a broad range of applications, Harn’s membrane treatment equipment is custom-designed for the specific application. Harn is renowned for their emphasis on quality. Their membrane equipment is manufactured in-house controlling the quality and delivery. Harn has earned a reputation for excellence over 40 years.
Areas of expertise: Reverse Osmosis (RO) and Nanofiltration (NF) membrane treatment systems, Microfiltrations (MF) and Ultrafiltration (UF) membrane treatment systems, Pilot Systems for industrial and municipal application, Seawater membrane systems, membrane services such as membrane cleaning, membrane replacement, and water treatment plant maintenance.
Harn R/O Systems, Inc.
