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What is the difference between single-stage reverse osmosis and two-stage reverse osmosis equipment?
- 2019-05-18-

The current reverse osmosis water treatment equipment is mainly divided into single-stage reverse osmosis and two-stage reverse osmosis equipment.

Because of the different process, reverse osmosis equipment is divided into single-stage reverse osmosis and two-stage osmosis equipment. The single-stage reverse osmosis equipment is a single-stage reverse osmosis process in which raw water passes through a pretreatment system and a precision filter, and the raw water is directly sent to the reverse osmosis device through a high-pressure pump.

The two-stage reverse osmosis equipment is also called second-stage reverse osmosis. The raw water is pressurized to the pretreatment system for coarse filtration and then filtered to a precision filter. After entering the filter, the water produced by the system is pressurized by a high-pressure pump of Class 1 to a Class 1 reverse osmosis system. The process of producing product water is called two-stage reverse osmosis. .

Single-stage reverse osmosis means that the water treatment equipment only has one-stage filtration, that is, only one reverse osmosis membrane filtration. The two-stage reverse osmosis is a fully automatic two-stage reverse osmosis water treatment equipment that is filtered through a reverse osmosis membrane after one filtration. In line with the price and quality, the quality of the low price can not be guaranteed, mainly depends on the configuration of electrical components and membranes and accessories and electrical appliances. The two-stage reverse osmosis equipment is equal to the principle of secondary filtration, so the price will be higher than the price of single-stage reverse osmosis. high.

So, what is the difference between single-stage reverse osmosis and two-stage reverse osmosis?

From the conductivity of the produced water, the conductivity of the water is generally below 10-20μS/cm after the single-stage reverse osmosis treatment; after the two-stage reverse osmosis treatment, the conductivity of the water can be 5μS/ Below cm or even lower.

The desalination rate of single-stage reverse osmosis equipment and two-stage reverse osmosis equipment is somewhat different. The double salt reverse osmosis equipment has higher salt rejection rate than single-stage reverse osmosis equipment.

From the appearance, the difference between single-stage and two-stage reverse osmosis equipment is relatively simple. There is one vertical pump in one stage and two vertical pumps in two stages.

In terms of system differences, a single-stage reverse osmosis device is a device that removes some of the water through a permeable membrane separation technique. The two-stage reverse osmosis equipment refers to the filtration of raw water through two RO reverse osmosis membranes to achieve a high salt rejection rate.

When the general industry or other industries do not have too high a requirement for water quality, a single-stage reverse osmosis device will be used. If the water quality is strictly required, a two-stage reverse osmosis device will be used.

The two-stage reverse osmosis equipment includes a two-stage RO unit, a cleaning system and an intermediate water tank. The two-stage RO process can better remove ions in the water, so that the water quality of the effluent can meet the requirements of the EDI equipment, and can be used to prepare ultrapure water.


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