Disc-tube membrane has high filtration level and good effluent quality is its important advantage

The disc membrane is a membrane separation technology with pressure as the driving force. Its basic principle is to use pressure difference as the driving force to apply a pressure exceeding the osmotic pressure of the solution to the semi-permeable membrane to penetrate the water pressure in the concentrated solution into the dilute solution of the membrane. On one side, the concentrated solution is continuously concentrated and remains on the other side of the membrane to achieve the separation of solute and water. The separation function of the reverse osmosis asymmetric membrane is mainly the densely arranged surface layer of macromolecules. It can remove almost all impurities in the water through the screening of substances and the filtering of solute-solvent-membrane polymers. Kinds of inorganic salts, molecules, organic colloids, bacteria, viruses, heat sources, etc.

The fluid dynamics of the disc tube membrane and the structure of the unrestricted open channel and the completely turbulent water supply flow system make it difficult for the suspended solids in the feed (raw water) to block the inside of the membrane column. Importantly, the low-frequency and built-in automatic cleaning system has extended the life of the membrane column to as long as 5 years.

According to the analysis of the advantages and application scope of various membrane technologies, to successfully intercept the pollutants (especially total nitrogen) in the leachate, it must be DTRO (dish tube reverse osmosis membrane system).

 　　Disc tube membrane processing unit

 　　 The organic matter and nitrogen pollutants in the effluent of the general ultrafiltration system have been mostly removed, but according to the emission standards, they are still far from each other, so they still need to undergo advanced treatment by membrane separation technology.

 　　DTRO is a reliable water treatment equipment with advanced technology in the current water treatment industry. The system uses a disc tube type reverse osmosis membrane. The principle is that under the action of pressure, water molecules penetrate the reverse osmosis membrane, and the impurities in the water are intercepted by the reverse osmosis membrane and carried out by the concentrated water. The use of reverse osmosis technology can effectively remove impurities such as macromolecular dissolved salts, colloids, bacteria, viruses, bacterial endotoxins and most organic matter in the water. The desalination rate of divalent salt in the system is generally above 99%. In addition, the system has simple operation and operation The advantages of stability and low energy consumption.

　　The disc tube membrane belongs to the category of dense membranes. The advantages are high filtration level and good effluent quality.

 　　Reverse osmosis separation particle level can reach ion level. Its operating mechanism is not very clear so far. It is generally believed that the mechanism is selective adsorption-capillary flow mechanism: due to the hydrophilicity of the membrane surface, water molecules are preferentially adsorbed and salt molecules are repelled, so two waters are formed on the membrane surface. When pressure is applied to the pure water layer of molecules, the molecules of the pure water layer continuously flow through the reverse osmosis membrane through capillary tubes. It is very important to control the pore size of the skin layer, which affects the desalination effect and water permeability. Generally, when the thickness of the pure water layer is twice the thickness, it is called the critical pore size of the membrane, which can achieve the ideal desalination and water permeability.

Therefore, the retention rate of the reverse osmosis membrane for organic pollutants and divalent salts is over 99%, but the required osmotic pressure is relatively large, and the yield is low. Generally, the yield of reverse osmosis permeate (clear liquid) is 80% about.