What is OR Membrane Filtration?
Membrane filters act as a barrier to separate contaminants from water, or they remove the particles contaminating the water. Reverse osmosis, ultrafiltration, and nanofiltration all use a membrane in their different filtration processes.
A membrane filter is the main and most important part of industrial water purification devices in the field of filtration and purification. The industrial membrane filter is a semi-permeable membrane, which removes all chemical pollution, nitrates, nitrites, and arsenic up to 99.6%, and it also has the ability to remove dissolved substances in water up to 0.0001 microns.
What are the types of industrial water purification membrane filters?
Industrial membrane filters in industrial water purification devices have different types according to the type of incoming water, the type of structure, and also the production capacity.
Membrane filters are divided into seawater membrane filters and brackish water filters based on the type of incoming water.
The marine membrane filter is suitable for sea water and is also known as SW (SeaWater). This type of industrial membrane filter is suitable for waters with a hardness of more than 10000 mg/liter.
The brackish water membrane filter is suitable for industrial devices that use well water or city water in their systems. These filters are also known as BW filters (Brackish Water), BW membrane filters are suitable for water with hardness less than 10000 mg/liter.
How does a membrane filter work?
Reverse osmosis applies pressure to a semipermeable membrane that allows the water molecules to pass through while flushing the dissolved inorganic compounds into the drain.
First, the industrial membrane filter, which consists of a number of membrane layers, is placed inside the housing or pressure vessel, water enters the housing or vessel and surrounds the filter and passes through the pores, and enters the purified water stream, it is worth mentioning The water is concentrated and contains pollutants and enters the sewer.
What is the structure of the reverse osmosis industrial membrane filter?
The reverse osmosis membrane filter is one of the most widely used filters in the field of domestic and industrial water purification, this filter is able to remove all pollutants soluble in water at a pressure of 65 PSI and a temperature of 77 degrees Celsius.
pH is one of the influencing factors in the performance of reverse osmosis, the standard range for which is 2 to 12.
Another important factor in using an industrial membrane filter is the amount of chlorine in the water because a large amount of chlorine causes serious damage to the polyamide layer. The standard amount of chlorine in the water to pass through the membrane filter is 0.1 mg/liter.
Of course, the RO membrane filter is placed after the pre-treatment stage and is able to remove the following from water:
- Heavy metals
- Organic materials
How to clean the membrane filter?
Using an industrial membrane filter for a long time will cause its tiny pores to be blocked and ultimately reduce its efficiency. To solve this problem, washing is done. Among the points that should be considered in connection with cleaning are the following:
The cleaning time should be determined according to the water entering the industrial desalination machine and its pollution level. If you have to perform the cleaning process in short intervals, it is recommended to check the pre-treatment of the machine and make the necessary changes if necessary. to be In the cleaning process, alkaline detergents can be used to remove colloidal and organic materials.
To wash the industrial membrane filter, first, in a tank, the amount of acid determined by the expert is mixed with a certain amount of water, then this mixture is introduced into the membrane with the help of a pump at a pressure of 3 times, and the wastewater is directed to the tank. Then after thirty minutes of washing, drain the acid and in the next step, add the alkali to the filter in the same way. If bacteria are deposited in the filter, pour detergent into the tank and repeat the above steps again. In the end, we start the device and check the amount of water production.
When should the industrial membrane filter be replaced?
If all principles of washing and maintenance of industrial membrane filters are followed, the average life of the best membrane filters is 3 years, and because industrial membrane filters are disposable filters, they should be replaced after they are used up. Replacement of industrial water purification membrane filter should be done by a professional expert so as not to damage the filter membrane and filters.
The pressure vessel of the industrial membrane filter is called a chamber that, by placing the membrane inside it and increasing the water pressure, causes the water to be purified. Pressure vessels are offered in three types according to the pressure for nanofiltrations, brackish water, and sea salt water. Membrane filters are located inside a tube-like chamber, which is called Perschrusel and consists of several thin layers that are spirally wrapped around a plastic tube.