Ultrafiltration and reverse osmosis device

Ultrafiltration and reverse osmosis device

Usage and introduction:

Ultrafiltration is a kind of tangential flow of fluid on the surface of the membrane, which is separated and filtered by the lower pressure driven by the molecular weight of the solute. It is a physical separation process. The pore size of the UF membrane is about 0.002 to 0.1 microns (MWCO is about 500000 - 1000). The substance and the smaller pore size of the material will be used as the liquid through the filter, and the filter material can not be concentrated in the discharge liquid. So the production water (permeate) containing water, ions and small molecular weight substance and colloid material, high molecular material, particles, bacteria, viruses and protozoa will be membrane interception, through concentrated water discharge, backwashing and chemical cleaning and removal. The ultrafiltration membrane can be used repeatedly and can be cleaned with common cleaning agent.

In the removal of suspended matter, colloid, organic matter, bacteria and virus, etc., the effluent turbidity and SDI value were decreased, and the water quality of the reverse osmosis system was improved.

The basic principle and main function of reverse osmosis:

When in the concentrated solution plus pressure (the pressure is greater than the osmotic pressure), side in a concentrated solution of the solvent will flow through a semipermeable membrane to dilute solution and solute due to membrane remains in concentrated solution side, this phenomenon is reverse osmosis.

The greater the water flux of the membrane element, the higher the recovery rate, the higher the concentration of the membrane surface, the concentration of the material on the surface of the film is different from the concentration of the substance in the main stream, resulting in the phenomenon of concentration polarization. Concentration polarization can increase the salt concentration, the osmotic pressure of the membrane increases, the transmittance of the salt increases, and more energy is needed to increase the pressure of the water supply.

Reverse osmosis system is the most important desalination equipment in the whole supply water treatment system. The main function is to remove the anion, cation, dissolved colloid, small molecule organic matter and so on. The removal rate of the reverse osmosis system can reach more than 98%.