What is Reverse Osmosis (RO)?
Reverse osmosis (RO) is one of the most effective water treatment technologies used today. It produces high-quality water for applications ranging from industrial processes and water reuse to seawater desalination and wastewater treatment.
To understand reverse osmosis, it helps to first understand osmosis.
What Is Osmosis?
Osmosis is a natural process where water moves across a semi-permeable membrane from an area with a lower concentration of dissolved solids to an area with a higher concentration. The movement continues until equilibrium is reached.
What Is Reverse Osmosis?
Reverse osmosis forces the opposite of this natural process.
By applying pressure, water is forced through a semi-permeable membrane in the opposite direction. The membrane allows water molecules to pass while rejecting many dissolved salts, PFAS, heavy metals, organics, and other contaminants.
The result is two separate streams:
Permeate: High-quality treated water that can often be reused.
Residual leachate (Concentrate): The remaining stream containing the contaminants removed during treatment.
How Does Reverse Osmosis Work?
Although every system is designed for its specific application, the process follows the same basic steps:
Feed water enters the system.
Pressure forces the water toward the membrane.
The membrane separates clean water from dissolved contaminants.
Treated water is collected while the rejected contaminants remain in the residual leachate.
Where Is Reverse Osmosis Used?
Reverse osmosis is used anywhere high-quality water is required, including:
Landfill leachate treatment
Industrial wastewater treatment
Water reuse and recycling
Seawater desalination
Food and beverage production
Pharmaceutical manufacturing
Marine applications
Power generation
Why Reverse Osmosis Matters
As freshwater resources become increasingly valuable, reverse osmosis helps industries recover clean water from challenging water sources while reducing freshwater demand and supporting long-term operational and environmental goals.
Whether the objective is water reuse, improving water quality, or meeting regulatory requirements, reverse osmosis has become one of the most important technologies in modern water treatment.