What is the difference between a water purifier that produces wastewater and a regular water purifier? Talking about reverse osmosis vs. pure wastewat

What is the difference between a water purifier that produces wastewater and a regular water purifier? Talking about reverse osmosis vs. pure wastewater

There are many devices and methods for treating water that we come into contact with in our daily lives, especially the process of converting natural water and tap water that has undergone preliminary treatment in a water plant into drinking water. The process ranges from boiling to adsorption of impurities using aluminum potassium sulfate (alum) and activated carbon, to filtration through a combination of cartridges to be used as drinking water. At the same time, if you continue to raise the standard to prepare pure water as the ultimate goal, then there is also a combination of distillation, RO reverse osmosis, ultraviolet radiation, deionization exchange and other technical steps.

RO reverse osmosis is a semi-permeable membrane with a wider range of applications, from the industrial, chemical field “devolution” to expand the technology in the domestic field, which also brings with the general filtration water purifier / water dispenser, will produce wastewater RO reverse osmosis water purifier. The difference between the two is mainly due to the latter through the application of RO reverse osmosis technology, water purification capabilities further, with the ability to reduce the content of inorganic salts dissolved in water, resulting in the ability to soften water.
Considering that the ability of conventional cartridges to adsorb and intercept impurities is always limited, the application of semi-permeable membranes can be said to have made a big step forward in the technology of water filtration, which should be briefly introduced as the theoretical basis of the chemical potential and osmotic pressure.
Chemical potential and as the thermodynamic intensity of the temperature is similar, we know that heat is always spontaneous from the high temperature object to the low temperature object, the same microscopic particles always tend to transfer from the high chemical potential region to the low chemical potential region, manifested in a specific environmental conditions: only water molecules through the semipermeable membrane on both sides of the concentration of different water solutions, is the low concentration of water molecules to the high concentration of the tendency to infiltrate the side of water molecules.

But this trend is not never-ending, on the one hand, with the passage of water molecules, the concentration of the solution will change in real time, on the other hand, the amount of more aqueous solution on the side of the high concentration will generate additional pressure, and will eventually form a pressure and chemical potential of the equilibrium state, which prevents the penetration of water molecules from the side of the low concentration to the side of the high concentration, and from the side of the high concentration of the smallest additional pressure exerted is the osmotic pressure.
Understand this, it will be easier to understand the principle of RO reverse osmosis water purifier: through the booster pump and other artificial ways in the high concentration of water solution (such as tap water) side to exert more pressure, forcing water molecules to reverse osmosis into the low-concentration side, and most of the salts can not be through the semi-permeable membrane, can only be deposited in the high-concentration side, so that from the low concentration side of the outflow of the water is filtered, adsorbed, softened, and other purification steps. The water flowing out from the low concentration side is the water that is more suitable for drinking after including filtration, adsorption, softening and many other purification steps.
Some readers may ask: then the water purifier can only use RO reverse osmosis technology, no longer use conventional cartridges? This is theoretically feasible, but in practice is not appropriate, because on the one hand, taking into account the size and type of impurities, originally in the conventional cartridge can be blocked in the larger solid impurities, if the water flow directly with the impact on the surface of the semi-permeable membrane, it is likely to make it damage, so that the unit cost of a higher semi-permeable membrane directly scrapped; on the other hand, due to the cost of trade-offs with the service life of the conventional cartridge, originally the interceptor The role of the original conventional cartridge interception of the field is the larger solid impurities, but also a more economical solution, after physical, chemical, adsorption and other methods of heavy filtration of water, which in the previous steps can not help the trace salts and then handed over to the semi-permeable membrane for interception, so as to maximize the extension of its service life, reduce the burden on the user's cost of consumables. As the old saying goes, if you don't use a bull's knife to kill a chicken, this saying can also be used in the purification of water.

The last question to be answered is why RO reverse osmosis water purifier will produce wastewater.
This point has to do with the semipermeable membrane intercepts the high concentration side of the salt, said earlier can not pass through the semipermeable membrane salt will be deposited in the high concentration side, in order to extend its service life, there is a need for self-cleaning way to act on the surface of the high concentration side of the semipermeable membrane, the carrier of this cleaning method is naturally in the water purifier at all times in the water that exists in the water purifier, in the user to open the faucet of the water purifier, purification processes When the user opens the faucet of the water purifier, the purification process is carried out simultaneously with the cleaning process of the flowing water flushing the surface of the semi-permeable membrane, and the accumulated salts are thus discharged with a portion of the water to become wastewater. This water with high salt content is not drinkable, but it has also been purified by the basic purification of a variety of cartridges before the semi-permeable membrane, and there are quite a few scenarios in which it can be utilized, so it is not a particular waste of water.

Nevertheless, the enhancement of pure wastewater ratio is also in recent years RO reverse osmosis water purifier manufacturers research and development of the popularity of the early 1:3 to 1:1, and then now some products can do 3:1 pure wastewater ratio, greatly enhancing the utilization of water resources, reduce water costs at the same time is also considered to be a contribution to the environment in which we live. A part of the manufacturer example of the product by equipping the main vice double RO reverse osmosis membrane to obtain this effect, the main RO reverse osmosis membrane produced by the wastewater and then through a secondary membrane, not only to enhance the ratio of pure wastewater, but also reduces the pressure of a single RO reverse osmosis membrane, extending the service life.