Introduction to reverse osmosis: introduction to the characteristics of reverse osmosis membranes and ultrafiltration membranes

Reverse osmosis is a water treatment technology that uses membrane separation. It is the reverse process of osmosis in nature (the reverse osmosis process in which salt water is used to overcome osmotic pressure with external driving force to make water molecules pass through the membrane).

1. The reverse osmosis water treatment process is basically a physical desalination method, and it has many advantages that traditional water treatment methods do not have:

  • Reverse osmosis is the desalination and purification of salt-containing feed water using a physical method without phase change at room temperature. At present, the desalination rate of ultra-thin composite membrane elements can reach over 99.5%, and can simultaneously remove colloids, organic matter, bacteria, viruses, etc. in water.
  • Water treatment only relies on water pressure as the driving force, and its energy consumption is the lowest among many treatment methods.
  • There is no need for a large amount of chemical agents and acid and alkali regeneration treatment, no chemical waste liquid, waste acid, lye discharge, and no environmental pollution.
  • The reverse osmosis device can continuously run for water production, the system is simple, the operation is convenient, and the product water quality is stable.
  • Operation maintenance and equipment maintenance workload is very small.
  • The equipment occupies a small area and the space required is also small.
  • Suitable for a wide range of raw water quality, not only for the treatment of brackish water, sea water and even sewage, but also for the treatment of fresh water with low salinity.

2. Features of ultrafiltration membrane, Different from ordinary hollow fiber, flat and rolled membranes, in order to adapt to the direct treatment of turbidity water, the tubular membrane structure of ultrafiltration membrane with technical technology has the following characteristics:

  • The membrane material is polyethersulfone, which has a long service life.
  • It is resistant to chlorine, potassium permanganate, ozone and other strong oxidants, so it can be combined with chemical oxidation to remove iron and manganese. It is resistant to strong acids and alkalis, and can be chemically cleaned with ordinary acids and alkalis.
  • The tubular film has high mechanical strength and good tensile strength.
  • Strong adaptability to the raw water quality, the treated water quality is excellent, stable, and not subject to changes in the raw water quality.
  • Strong resistance to biological pollution, not subject to biodegradation, easy to clean and restore.
AQU200 UF filter membranes

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