November 23

Working of Ro Membrane


A Reverse Osmosis (RO) membrane is a thin film composite (TFC) made up of polyamide. It works on the principle of osmosis, which is the movement of water molecules from an area of high concentration to an area of low concentration through a semipermeable membrane. In an RO system, water molecules are forced by pressure from the concentrated side of the membrane to the dilute side.

The working of RO membrane is a bit complicated. It involves the use of two types of membranes, one is the cation exchange membrane and another is the anion exchange membrane. These membranes are used to remove the dissolved salts from water.

The water that has been passed through these membranes is known as demineralized water or deionized water.

Working of Ro Membrane


What is the Membrane Used in Ro?

Reverse osmosis (RO) is a water purification technology that uses a semipermeable membrane to remove ions, molecules, and larger particles from drinking water. In reverse osmosis, an external pressure is used to overcome osmotic pressure, a colligative property that is driven by chemical potential differences of the solvent, a thermodynamic parameter. Reverse osmosis can remove many types of dissolved and suspended chemicals from water, including bacteria, and is used in both industrial processes and the production of potable water.

The result is that the solute is retained on the pressurized side of the membrane and the pure solvent passes to the other side. To be “selective”, this membrane should not allow large molecules or ions through its pores (holes), but should allow smaller components of the solution (such as solvent molecules) to pass freely.

How Do You Check Ro Membrane is Working Or Not?

If you have a reverse osmosis system at home, it is important to know how to check if your RO membrane is working or not. This is because the RO membrane is the key component of the system that removes contaminants from your water. There are a few simple tests that you can do at home to check if your RO membrane is working properly.

The first test that you can do is called a pressure drop test. To do this, simply turn on your reverse osmosis system and let it run for about an hour. Then, turn off the water supply to the unit and open the storage tank valve to release any pressure that has built up inside.

Once all the pressure has been released, carefully remove the membrane housing cap and check the PSI reading on your gauge. If the reading is below 50 PSI, then your RO membrane might be damaged and needs to be replaced. Another test that you can do is called a product water TDS test.

To do this, collect a sample of water from your storage tank after your reverse osmosis system has been running for awhile. Then, use a TDS meter to measure the Total Dissolved Solids in this sample of water. The TDS level in your product water should be lower than 10 ppm if your RO membrane is working properly.

You can also conduct a wastewater TDS test to check if your RO membrane is still effective. To do this, collect a sample of wastewater from your drain line after running several gallons of water through yourreverse osmosis system . Use a TDS meter to measurethe Total Dissolved Solids in this sample of wastewater ,and compare it with theTDS level inyour productwater .

If there isno significant difference betweenthe two readings , thenthis meansthat mostofthe dissolvedsolids inyour feedwater are beingremoved byyour R Omembraneand it mayneedto bereplaced soon .

Can Ro Membrane Work Without Pump?

No, a reverse osmosis (RO) membrane cannot work without a pump. The RO process relies on pressure to force water molecules through the semi-permeable RO membrane, leaving behind contaminants that are too large to pass through the pores of the membrane. Without a pump to generate this pressure, the RO process would not be able to function.

RO Membrane Operation

Ro Membrane Working Animation

If you’re like most people, the thought of a reverse osmosis membrane working to clean your water may seem a bit daunting. After all, the process is responsible for removing impurities from water at a molecular level. But what exactly does that mean?

And how does it work? Reverse osmosis membranes are made up of tiny pores that allow water molecules to pass through while blocking contaminants. The size of the pores is important because it determines what can and cannot pass through the membrane.

Water molecules are small enough to pass through the pores, but larger contaminants such as bacteria, viruses, and minerals are blocked. This means that when water passes through a reverse osmosis membrane, impurities are removed and only clean water comes out the other side. Reverse osmosis membranes are used in a variety of different settings in order to purify water.

They can be found in everything from home drinking water systems to large-scale commercial operations. No matter the size or scope of the application, reverse osmosis membranes provide an effective way to remove impurities and produce clean, safe water.


One of the most important components in a reverse osmosis (RO) system is the RO membrane. It is a thin, selective barrier that allows water molecules to pass through while rejecting larger molecules such as dissolved salts, organics, and bacteria. The working principle of an RO system is based on the difference in solute concentration on either side of the membrane.

The feed water (water to be treated) is introduced under pressure into the permeate chamber (the center of the spiral-wound element). This high-pressure feed water forces water molecules through the semi-permeable membrane where smaller molecules such as water vapor and oxygen pass through while larger molecules are rejected and flushed out with wastewater. As a result, clean permeate water with a lower concentration of dissolved solids flows out from the permeate chamber while concentrate or brine containing concentrated impurities is discharged from the reject port.


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