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The reverse osmosis system (RO) is a permeable membrane powered by a pressure difference by means of the function of a selective permeation (semi-permeable) membrane, which flows into the central pipe through the permeate flow channel, and then flows out into the permeable water pipe at one end.
road
.
Impurities in the water, such as ions, organics, bacteria, viruses, etc.
, are trapped at the inlet side of the membrane, and then flow out at the outlet end of the concentrated water, so as to achieve the purpose of separation and purification
.
Figure 1 Why should the raw water of Jingderui purified water equipment be pretreated and filtered before entering the RO membrane? Because raw water is generally collected from nature, including groundwater, mountain spring water, reservoir water and other natural water sources in nature, it has not undergone any artificial purification treatment
.
The water contains a lot of impurities, such as colloids, suspended particles, organic and inorganic substances, etc.
If the raw water enters directly, it will easily cause damage to the RO membrane
.
Therefore, the pretreatment and filtration of raw water before entering the RO membrane can be summarized into the following three reasons: 1.
Particulate matter easily scratches the surface of the RO membrane, resulting in blockage or perforation; 2.
Calcium and magnesium ions are prone to scaling on the surface of the RO membrane, requiring frequent Cleaning; 3.
Oxidants are easy to cause RO oxidation and perforation
.
Before the raw water enters the RO membrane, different pretreatment technologies are required for different water quality to meet the influent water quality requirements of the reverse osmosis membrane element, which is also the basic condition for the subsequent reverse osmosis system to maintain stable operation
.
In order to better protect the RO membrane, we can also strictly control the quality of the influent water to ensure that the system operates under the required water quality conditions, and at the same time achieve the purpose of protection through operating pressure control, inlet water temperature control, and drainage control
.
Take Dow BW30-400 membrane element as an example, the type of diaphragm is polyamide composite membrane; the maximum operating temperature is 113° (45°); the maximum operating pressure is 600psig (41bar); the maximum pressure drop is 15psig (1.
0bar); pH range, continuous operation a is 2-11; pH range, short-term cleaning (30 minutes) b is 1-13; maximum feed water flow is 85gpm (19m³/hr); maximum feed water flow SDI15 is 5; allowable free chlorine content c Therefore, before the raw water enters the RO membrane, it is pretreated and filtered, which not only helps to prolong the service life of the RO membrane, but also helps to improve the water quality of the subsequent system
.
road
.
Impurities in the water, such as ions, organics, bacteria, viruses, etc.
, are trapped at the inlet side of the membrane, and then flow out at the outlet end of the concentrated water, so as to achieve the purpose of separation and purification
.
Figure 1 Why should the raw water of Jingderui purified water equipment be pretreated and filtered before entering the RO membrane? Because raw water is generally collected from nature, including groundwater, mountain spring water, reservoir water and other natural water sources in nature, it has not undergone any artificial purification treatment
.
The water contains a lot of impurities, such as colloids, suspended particles, organic and inorganic substances, etc.
If the raw water enters directly, it will easily cause damage to the RO membrane
.
Therefore, the pretreatment and filtration of raw water before entering the RO membrane can be summarized into the following three reasons: 1.
Particulate matter easily scratches the surface of the RO membrane, resulting in blockage or perforation; 2.
Calcium and magnesium ions are prone to scaling on the surface of the RO membrane, requiring frequent Cleaning; 3.
Oxidants are easy to cause RO oxidation and perforation
.
Before the raw water enters the RO membrane, different pretreatment technologies are required for different water quality to meet the influent water quality requirements of the reverse osmosis membrane element, which is also the basic condition for the subsequent reverse osmosis system to maintain stable operation
.
In order to better protect the RO membrane, we can also strictly control the quality of the influent water to ensure that the system operates under the required water quality conditions, and at the same time achieve the purpose of protection through operating pressure control, inlet water temperature control, and drainage control
.
Take Dow BW30-400 membrane element as an example, the type of diaphragm is polyamide composite membrane; the maximum operating temperature is 113° (45°); the maximum operating pressure is 600psig (41bar); the maximum pressure drop is 15psig (1.
0bar); pH range, continuous operation a is 2-11; pH range, short-term cleaning (30 minutes) b is 1-13; maximum feed water flow is 85gpm (19m³/hr); maximum feed water flow SDI15 is 5; allowable free chlorine content c Therefore, before the raw water enters the RO membrane, it is pretreated and filtered, which not only helps to prolong the service life of the RO membrane, but also helps to improve the water quality of the subsequent system
.
