How reverse osmosis system works?

 In industrial production, water purity directly affects product quality. Reverse osmosis systems are a core water purification solution, widely used in electronics manufacturing, pharmaceuticals, food and beverage, and municipal water supply.

Reverse osmosis is one of the core technologies in the water treatment industry. A deep understanding of the working principle of reverse osmosis systems is key to optimizing equipment operation and maintenance and ensuring water purification effects.

Reverse intervention in natural osmosis

The core principle of reverse osmosis stems from the reverse intervention of the natural osmosis phenomenon. Under natural conditions, water molecules spontaneously move from a low-concentration solution to a high-concentration solution through a semi-permeable membrane to achieve concentration equilibrium. Reverse osmosis, however, breaks this natural law by applying external pressure, forcing water molecules to flow from the high-concentration raw water side through the semi-permeable membrane to the low-concentration purified water side. This semi-permeable membrane has extremely small pores, only about 0.0001 micrometers, hundreds of times smaller than bacteria, viruses, and dissolved salt molecules, enabling it to precisely intercept various pollutants.

Pre-treated raw water

Raw water first enters the pretreatment unit, passing sequentially through a 5-micron precision filter and an activated carbon filter. The former removes solid impurities such as silt and rust, preventing scratches on the membrane elements. The latter adsorbs residual chlorine and organic matter in the water, preventing chlorine from damaging the membrane's polymer structure. If the raw water has high hardness, a water softener is also required to remove calcium and magnesium ions, preventing scaling and clogging on the membrane surface.

Water purification driven by high pressure

The pretreated water is pressurized and transported to the core separation unit by a high-pressure pump. Depending on the total dissolved solids (TDS) content of the raw water, the high-pressure pump needs to provide a pressure of 150-800 psi to ensure water molecules can easily penetrate the membrane. The pressurized water flows through a spiral-wound RO membrane element. Under pressure, water molecules pass through the membrane pores to form purified water, while impurities such as salts, heavy metals, and bacteria are retained by the membrane and discharged with the concentrated wastewater.

Adapt to different water quality requirements

To meet water quality standards in different scenarios, water purification requires post-treatment.

For drinking water applications, mineralization devices are needed to supplement minerals such as calcium and magnesium to improve taste.

Industrial ultrapure water requirements necessitate the use of equipment such as ultraviolet sterilization and polishing filtration to further remove residual impurities. Simultaneously, the system's control panel monitors parameters such as pressure and flow rate in real time, ensuring stable operation through automated adjustments.

Factors influencing the reverse osmosis system

The performance of a reverse osmosis system is affected by multiple factors. Higher raw water TDS values ​​require greater pressure and increase energy consumption. For every 1°C increase in water temperature, the purified water flux increases by approximately 2%-3%, but this must be controlled within the membrane element's temperature tolerance range.

Furthermore, regular membrane cleaning and filter replacement are crucial for maintaining system efficiency and extending its lifespan. Industrial-grade systems typically require professional cleaning every 6-12 months.

Summarize

A thorough understanding of the working principles and key operational points of reverse osmosis systems can not only optimize equipment maintenance efficiency but also provide technical support for the efficient utilization of water resources.

If you still have questions about how it works, feel free to contact XinJieYuan.