Application of secondary reverse osmosis water treatment process
At present, the new water treatment technology, which is the first level of international lings, is a two-stage reverse osmosis water treatment process, which has broad application prospects in pharmaceutical production, especially in enterprises undergoing GMP transformation. The use of this process not only ensures that the treated water meets the purified water standards specified in the Pharmacopoeia, but also avoids the environmental pollution that may be caused by the conventional process and can effectively reduce the cost of water treatment.
Water is an indispensable raw material in the production of pharmaceuticals. In the production of tablets, capsules, oral liquids, and external pharmaceuticals, all equipment, containers, inner packagings and tools that come into contact with pharmaceuticals must be cleaned with pure water; in the production of sterile preparations, any container that comes into contact with the drug, The inner packaging and tools must be washed with distilled water; while the production of large infusions and injections requires a large amount of distilled water. Whether the water treatment process and equipment are advanced is directly related to the quality and cost of pharmaceutical production. For many years, the traditional process of China's pharmaceutical companies, ion exchange, and ion exchange regeneration must use acid, alkali, acid, alkali storage tanks and neutralization tanks, causing environmental pollution and increasing equipment investment.
Reverse osmosis is one of the effective water treatment methods in modern technology. The principle is that when the same volume of dilute solution (such as fresh water) and concentrated solution (such as sea water or salt water) are placed on both sides of the same container, the middle is used. Semi-permeable membrane barrier, the solvent in the dilute solution will naturally flow through the semi-permeable membrane to the side of the concentrated solution, so that the liquid level on the side of the concentrated solution is higher than the liquid level on the side of the dilute solution, forming a pressure difference. The osmotic equilibrium state is reached, which is the osmotic pressure (the size of the osmotic pressure is determined by the type of concentrated solution). If a pressure greater than the osmotic pressure is applied to the concentrated solution side, the solvent will flow to the dilute solution in the concentrated solution, and the flow direction is exactly opposite to the original permeation direction, which is called reverse osmosis. Reverse osmosis is a kind of pressure pushing. Force membrane separation technology, when the pressure applied in the water treatment system is greater than the osmotic pressure of the aqueous solution, the water molecules will continuously permeate through the membrane, flow into the central tube through the product water channel, and then flow out from the water outlet, and the ions in the water, Impurities such as organic matter and bacteria are intercepted on the water inlet side of the membrane and flow out from the concentrated water outlet to achieve separation and purification.
The secondary reverse osmosis process requires two applications of reverse osmosis during the water treatment process. The brief process is as follows: firstly, the raw water is sent to the original water tank through the pipeline, and the raw water is pressurized into the mechanical filter; between the raw water and the mechanical filter, the flocculant is injected by the stoichiometric pump to further condense the suspended matter in the water and pass through The mechanical filter is filtered; the residual carbon and organic matter in the water are further removed by the activated carbon filter, so that the pretreated water reaches the qualified standard. Before the qualified pretreatment enters the reverse osmosis, the scale inhibitor is injected into the stoichiometric pump to prevent the reverse osmosis membrane from scaling, and then passes through the security filter and is pressurized by the high pressure pump to enter the first stage reverse osmosis unit; The produced water of the reverse osmosis device enters the intermediate water tank, adjusts the PH value, and then enters the secondary reverse osmosis device. After the secondary reverse osmosis treatment produces water into the production tank, it is filtered through the terminal to become qualified purified water. It can be directly transported to each water point, or it can be distilled into a distilled water machine to prepare distilled water.
Compared with the traditional water treatment process, the secondary reverse osmosis process does not require ion exchange, and does not require the acid and alkali required for ion exchange regeneration. It does not need to be equipped with an acid-base storage tank and a neutralization tank. Environmental pollution caused by traditional processes is avoided and equipment costs are reduced. In addition, the secondary reverse osmosis process can completely remove colloidal substances, organic matter, iron ions and silica that are difficult to remove by conventional processes; improve the adaptability of water treatment equipment to changes in raw water quality and the reliability of effluent water quality; The degree of automation and technical content; reducing the labor intensity of operators, and so on.
In the past two years, the secondary reverse osmosis process has been favored by many pharmaceutical companies. The company has designed and installed two-stage reverse osmosis water treatment systems for dozens of pharmaceutical companies, many of which have passed GMP certification.
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