What is the Difference Between Reverse Osmosis and Nanofiltration, Ultrafiltration and Microfiltration?
Understanding the difference between industrial reverse osmosis and industrial filtration based ultrapure water processes (nanofiltration, ultrafiltration, and microfiltration) lies in the understanding of total dissolved solids (TDS) and total suspended solids (TSS).
Some substances can be removed from water by an ultrafiltration method. These removable substances are considered total suspended solids (TSS) as they are suspended particles in the water. Total dissolved solids (TDS) are the remaining substances that pass through the filter.
Total suspended solids (TSS) are measured by the clarity of water and the presence of suspended particles, referred to as turbidity (NTU). Total dissolved solids (TDS) are measured by their conductivity.
Ultrafiltration processes (microfiltration, ultrafiltration) use pressure to separate high-molecular-weight substances, suspended solids, bacteria, protozoa, and some viruses from water. These substances include small unseen particles, like viruses, all the way to small particles that can be seen, such as sand. Reverse osmosis and nanofiltration takes the purification process further by targeting what the other ultrapure filtration methods cannot, mainly dissolved solids. The chart below shows examples of the types of particles that can be removed by the various filtration approaches.
The levels of filtration are as follows, going from the most robust to the least robust at removing small particles. As a general guide, industrial filtration and industrial reverse osmosis particle removal can divided roughly by an order of magnitude:
- Microfiltration (~0.1 micron)
- Ultrafiltration (~0.01 micron)
- Nanofiltration (~0.001 micron)
- Reverse osmosis (~.0001 micron)
Which is the best level of filtration for your industrial water or lab water application? In absolute terms, industrial reverse osmosis will remove the smallest particles and ions among these options. However, what is best for your industrial water or lab water system will depend on your water requirements. If ultrafiltration is suitable for your needs, it may provide the best combination of cost, efficacy and effectiveness for your water filtration needs.
Note that both reverse osmosis and ultrafiltration systems can be used together or configured with various pre- and post-treatment equipment to achieve your ideal process, depending on water conditions and quality requirements. Industrial Water Solutions customizes our solutions to every client and can work with you to deliver cost-effective and efficient ultrapure water treatment. Contact us today.
Do you need support for your industrial water equipment repair or preventative maintenance? Industrial Water Solutions provides comprehensive PMT, technical support, and repair services for industrial water equipment including industrial water softeners, industrial reverse osmosis systems, industrial water UV systems, and various other industrial water systems across the United States.
Contact us at 800-820-9021 or info@industrialh2osolutions.com for a quote or service.
