Today, due to increasing water pollution and the spread of water diseases, both industrial and domestic water use cannot be separated from filtration equipment. There are many ways to filter and purify water, and reverse osmosis is one of the most advanced and widely used technologies today.

What is Reverse Osmosis

RO is a reverse process of the natural infiltration of water. As early as 1950, a scientist in the United States inadvertently found that seagulls sipped a large mouthful of seawater while flying at sea, and spit out a small mouthful of seawater after a few seconds.

This led to doubts and research conducted to discover that there is a thin film inside the seagull, which is very delicately constructed. It is through this membrane that seagulls filter seawater into drinkable water, and seawater containing impurities and highly concentrated salts is spit out.

What is Reverse Osmosis

How does Reverse Osmosis Work

Reverse osmosis technology is an important part of membrane separation technology. Reverse osmosis uses the pressure difference as the driving force to exert pressure on the feed liquid on one side of the membrane. When the pressure exceeds its osmotic pressure, the solvent will reverse osmosis against the direction of natural osmosis.

The clear solvent obtained from the low pressure side of the membrane is the permeate. The concentrated solution obtained from the high pressure measurement is the concentrate. Nowadays, reverse osmosis technology has developed rapidly and is widely used in the purification and concentration of various liquids, using reverse osmosis technology to obtain high-quality water.

Advantages of Reverse Osmosis Membranes

  • No heating required, no phase change
  • Simple equipment and small footprint
  • Easy to operate, wide range of application
  • Low energy consumption and high efficiency
  • High degree of automation, good quality of effluent
  • No pollution to the environment
Advantages of Reverse Osmosis Membranes

What Impurities can RO Membrane Remove

RO membrane can remove impurities such as particulate inorganic ions, organics and colloids in water, including:

  • Acrylamide
  • Antimony
  • Arsenic
  • Asbestos
  • Berrylium
  • Barium
  • Calcium
  • Carbon tetrachloride
  • Chlorine
  • Cyanide
  • Dye
  • Ethylbenzene
  • Mercury
  • Nitrate
  • Sodium
  • Sulfate
  • Styrene
  • Toulene
  • Tribute
  • Thallium
  • Vinyl chloride
  • Phosphate
  • PAHs – Polynuclear Aromatic Hydrocarbons Benzo(a) Pyrene
  • Xylenes

Why RO Membranes Need Pre-filtration

Liquids that are not pre-filtered contain many different impurities that can affect the performance and use of RO membranes.

  • The particles in the liquid are easy to scratch the surface of the RO membrane, which will cause the RO membrane to be blocked or perforated.
  • The inorganic ions in the liquid are easy to scale on the surface of the RO membrane, requiring frequent cleaning.
  • The oxidant in the liquid easily causes the RO membrane to be oxidized and perforated.

Before the raw water enters the RO membrane, different pre-filtration treatment methods are used for different processes to meet the influent water quality requirements of the reverse osmosis membrane. Thus, the stable and efficient operations can be maintained, and process investment and operating costs can be reduced.

Why do RO Membranes Need Pre-filtration

How to Clean RO Membrane

When the water production of the RO membrane system drops, the pressure difference is high, and the raw water microorganisms exceed the standard to block the membrane pores, it is time to clean. There are generally two ways of cleaning.

Physical cleaning

Physical cleaning is the use of mechanized flushing to remove contaminants from elements and restore membrane element performance. Sometimes vibration, gas-water mixing, and even ultrasonic waves are used.

The membrane elements are flushed by the influent water with appropriate pressure and high flow rate, and the contaminants and deposits attached to the membrane surface in a short period of time are washed away.

Chemical cleaning

Chemical cleaning Choose the appropriate chemical cleaning agent and cleaning scheme. In order to achieve the best cleaning effect, first perform low pH cleaning to remove mineral contaminants, and then perform high pH cleaning to remove organic matter.

The chemical cleaning method is best operated by professionals. Once the chemical cleaning agent is improperly selected or the method is incorrect, the pollution will deteriorate and even cause irreversible damage.

How to Clean RO Membrane

What Application Fields can RO Membranes be used for

Food industry

Formulation water, production water preparation, food processing concentration,

Beverage industry

Formulation water, production water, washing water preparation,

Pharmaceutical industry

Process water, preparation water, washing water, water for injection, sterile water preparation, drug concentration and separation,

Chemical industry

Production water, wastewater treatment, concentration and separation of valuable substances,

Power industry

Boiler feed water, circulating cooling water,

Electronics industry

Semiconductor industry ultrapure water, formula water,


Oil field injection water, advanced treatment of petrochemical wastewater, gas separation,

Drinking water engineering

Pure water preparation, drinking water purification.

Application Fields can RO Membranes be used for

How to Reduce Waste Water in Reverse Osmos Water System

Reducing the waste water in the reverse osmosis system is improving the recovery rate. On the basis of the existing reverse osmosis system and the premise that the water quality of the influent does not fluctuate, it can be realized by adding means such as pretreatment technology, fine filtration, and pH adjustment.

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