The difference between primary reverse osmosis and secondary reverse osmosis
Everyone often talks about reverse osmosis equipment including many types, such as primary reverse osmosis equipment, secondary reverse osmosis equipment, ultrapure water equipment, etc. These are all reverse osmosis equipment, but the process is different. With a reverse osmosis membrane filtration, the produced water can only be used by some manufacturers that use the first-level reverse osmosis equipment effluent standard. If it is drinking, it must be the water produced by the second-level reverse osmosis equipment. For industries with stricter water quality requirements, an EDI must be added after the reverse osmosis process. This equipment is what we often call ultrapure water equipment.
The first-level reverse osmosis device reverse osmosis is to separate the solvent (usually water) in the solution through the reverse osmosis membrane (or semi-permeable membrane) with sufficient pressure, so it is called reverse osmosis.
As an efficient desalination technology, reverse osmosis device can remove impurities such as inorganic ions, bacteria, viruses, organic matter and colloids in raw water to obtain high-quality purified water. According to the different osmotic pressure of various materials, a reverse osmosis method greater than the osmotic pressure can be used to achieve the purposes of separation, extraction, purification and concentration. Applicable fields: brackish water desalination, drinking water in high fluoride areas, high hardness water destinations, pure water for power plants, electronics, pharmaceuticals, metal processing, food, beverage, canned purified water, hospitals, laboratories, special water.
Standard configuration of first-level reverse osmosis device: imported rolled composite membrane, SUS304 stainless steel membrane shell, SUS304 stainless steel multi-stage centrifugal pump, 5um security filter pure water, concentrated water flow meter, inlet and outlet pressure indicator, high and low pressure protection integrated cleaning system .
The secondary reverse osmosis is to use the water produced by the primary reverse osmosis as the raw water, and carry out the second reverse osmosis purification, the conductivity of the product water is ≤3μs/cm. It has been widely used in drinking pure water. Reverse osmosis technology is often used The pre-demineralization treatment can reduce the load of ion exchange resin by more than 90%, and the amount of resin regenerant also reduces by 90%. Therefore, it not only saves operating costs, but also benefits the environment. The unique reverse osmosis water treatment technology is other water purification technology Methods such as distillation, electrodialysis, ion exchange, etc. cannot be reached.
If it is direct drinking water, two-stage reverse osmosis is generally required. When the effluent is pure water or high-purity water equipment, we need two-stage reverse osmosis equipment. Generally, mineral water equipment uses one-stage reverse osmosis equipment. The main difference in process between primary reverse osmosis equipment and secondary reverse osmosis equipment is the number of reverse osmosis membranes. The first-level reverse osmosis equipment only needs to pass through membrane filtration once, and the second-level reverse osmosis equipment needs to pass through reverse osmosis membrane filtration twice. When the raw water is pre-treated, it passes through the first-level reverse osmosis membrane, and the produced water enters the intermediate tank and then passes through the pump , Enter the secondary reverse osmosis membrane and undergo secondary filtration. The concentrated water from the first-stage reverse osmosis is often better than the first-stage reverse osmosis influent, so as the second-stage influent directly enters the second-stage reverse osmosis membrane, the water quality of the second-stage reverse osmosis is much better than that of the single-stage reverse osmosis. Of course, there is a big difference between the two in terms of price. The second-level reverse osmosis equipment is much more expensive than the first-level reverse osmosis equipment.
The process and procedures of the equipment are different, and the price is also different. Because if you want to produce water with better water quality, you need to add many parts in the process, so the cost will increase, so the higher the quality of the water, the price is also Will be more expensive
