Through the reverse osmosis membrane separation process, water molecules, membrane interface increases salinity, forming high thick layer, the layer with great concentration gradient of the concentration of the feed water flow, this phenomenon is called the concentration polarization of membrane (
The influence of concentration polarization can produce harmful to run.
Below small make up to you on the harm of it: (
Because of the high concentration of interface layer, makes the osmotic pressure rise accordingly.
After osmotic pressure increased, resulting in the original running conditions of water rate decline.
To achieve the original water rate, will improve the water supply pressure, the energy consumption in the product water increase (
Due to increased concentrations of salt in the interface layer, on either side of the membrane Δ c increase, make the products through to increase water salt.
Due to the increased concentration of interface layer, for easy scaling tendency of material increased precipitation, leading to the scale of membrane pollution.
In order to restore to frequent cleaning composition, performance and can cause irreversible membrane performance degradation.
Age form concentration gradient, take action from salt diffusion membrane surface, but the spread of the colloidal substances to hundreds of thousands of times smaller than the salt diffusion velocity, and concentration polarization is one of the important reasons contributed to the membrane surface colloid pollution.
Concentration polarization is the result of the salt water of the osmotic pressure increased, and therefore needed to reverse osmosis pressure also increase;
In addition, may also cause some undissolved salt (
Such as CaSO4)
On the membrane surface precipitation.
As a result, the operation must be kept in the salt water side flocculant in flow state in order to reduce the degree of concentration polarization.
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