Responding to the Secondary Pollution of Water Quality, Jinsai Technology Developed a Hollow Nanofiltration Membrane Direct Drinking Water Device

"Science and Technology Daily" / Time: 2015-01-26 17:00:56
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According to the Science and Technology Daily Network on January 23, 2015, the water is too "hard", residual organic matter, heavy metals and chlorine... The current tap water safety issues are worrying the public, so the installation of tap water purification equipment in homes, units, communities and other places is also increasing. The more common. However, many water purification equipment is expensive, and the filter element needs to be replaced regularly when in use, otherwise it will cause secondary pollution.

One of the achievements of the 863 project, the scientific and technological achievement of "Hollow Nanofiltration Membrane Direct Drinking Water Device" independently developed by Jilin Jinsai Technology Development Co., Ltd. has recently passed the expert evaluation meeting. The evaluation committee unanimously agreed to pass the evaluation of scientific and technological achievements, and determined that the overall technology of the results reached the domestic leading level, and the hollow fiber nanofiltration membrane reached the international advanced level.

Jin Shujie, chairman of Jilin Jinsai Technology Development Co., Ltd., said that the use of hollow nanofiltration membrane direct drinking water device is convenient for water production, without changing the core, the produced water is weakly alkaline, sterile, and organic, and retains a part of the beneficial minerals, which is safe and healthy. Drinking water directly, long-term drinking is beneficial to human health.

Natural pressure can achieve filtration
Nanofiltration membrane is a functional semi-permeable membrane with a pore size of 1-10 nanometers (nm) that allows low-valent ions to pass through. The reporter saw that the hollow nanofiltration membrane products are white fiber-like filaments, and countless such membrane filaments are installed in tubes. When the raw water flows through the pipe, small molecular clusters of water and beneficial minerals such as calcium, iron, and magnesium pass through the membrane filaments, gather together, and finally flow out from the faucet. Dust, colloids, bacteria, heavy metals, etc., are trapped in the membrane filaments due to the diameter of the membrane being larger than the pore diameter of the membrane. After regular cleaning, they can be used as waste liquid to flush floors, toilets, etc.

In other words, the diameter of dust and colloids is more than 50,000 nanometers, and the diameters of bacteria and heavy metals are more than 100 nanometers and 50 nanometers respectively. They are all blocked by nanofiltration membranes. The "passed" nanofiltration water contains small molecular clusters of water, calcium and iron. , Magnesium, Zinc and dozens of major and trace elements.

Jin Shujie said that in terms of membrane technology, it used to be in the hands of well-known international companies, such as Dow of the United States and Toray of Japan. The hollow Wiener membrane products independently developed by Jilin Jinsai broke the situation that imported nanofiltration membranes dominated the market. They use polyethersulfone-cellulose as the main material, and special porogens are mixed uniformly at a higher temperature. The high-temperature casting liquid is measured and extruded into a hollow shape. After the solvent is volatilized in an air bath at a certain temperature, Immediately enter the low-temperature non-solvent to solidify, and obtain a hollow nanofiltration membrane after washing with water. The prepared hollow nanofiltration membrane has a pore size of about 1-10 nanometers, a high porosity, and a pressure resistance of up to 0.8 megapascals (MPa). It is a medium-pressure membrane and has a pollution self-resolving function.

Professor Xue Kongkuan, dean of Beijing New Material Architecture Design and Research Institute, expressed his appreciation. He said that the "Hollow Nanofiltration Membrane Direct Drinking Water Device" project used advanced high-temperature melting-low-temperature phase separation technology to prepare hollow nanofiltration membranes, magnesium sulfate and chlorine. High removal rate of sodium. The film also has high temperature resistance, acid and alkali resistance and oxidation resistance.

"Hollow nanofiltration membrane direct drinking water device, the self-made hollow nanofiltration membrane is packaged in a shell using a medical-grade double-headed casting process, and is assembled with precision-designed pipeline connections." Jin Shujie said that the advantage of this device is that it only relies on The natural pressure of tap water can be filtered and separated; the original beneficial minerals and trace elements in the water are retained, and viruses, bacteria, fertilizers, pesticides, and organic substances that are harmful to the human body are intercepted; the pH value of the water quality is reached from 7 before filtration. After 7.4, the filtered water is weakly alkaline; the device is small in size, easy to use, and does not require power consumption.

　　 Wu Guangxia, a researcher at the Research Center for Ecological Environment of the Chinese Academy of Sciences, commented that the technology and equipment have solved the major technical problems of frequency-replacement filter elements for multi-stage water purifiers. The hollow nanofiltration membrane direct drinking water device developed with the hollow nanofiltration membrane as the core, the quality of the produced water reaches the new national drinking water standard. It can be used as a new type of membrane material for domestic safe and healthy direct drinking water devices, and is a special material for popularizing direct drinking water in education systems, schools, and kindergartens.

"Compared with well-known foreign membrane products, our hollow nanofiltration membranes use hollow fibers, which are simple in product form, easy to maintain, and backwashable; low operating pressure and no need for power pumps; low rejection of monovalent salts and ion selection It has high separability and is very suitable for softening water with high hardness." Jin Shujie said that there is no hollow nanofiltration membrane drinking water device at home and abroad, and this product is the first.

One Specialty, Multiple Functions, Wide Range of Uses
This series of technologies can be widely used in drinking water, sewage treatment, food, medicine, chemical and environmental protection and other fields. For example, to provide direct drinking water for municipalities, that is, through the establishment of urban nanofiltration water plants, to effectively suppress the fluctuations in water quality caused by inferior or polluted raw water, and to improve the quality of urban water supply as a whole, so that the citizens can directly drink high-quality nanofiltration water.

"The portable hollow nanofiltration membrane direct drinking water device we produce uses a special process for water production. The device has a compact structure and small size. It can be applied to field emergency drinking water devices where different surface water and shallow groundwater are raw water. The device is also very suitable Military camps, outposts, or rural villages with a small number of people and scattered can also be used for emergency use when severe geological and water pollution disasters occur." Jin Shujie said.

For example, methods such as alcohol extraction, water extraction or multi-effect evaporation are commonly used in traditional pharmaceutical processes for separation. These methods generally have complicated separation processes, low purity, and fail to meet the quality standards of a class of drugs, and the cost of pharmaceuticals is high. High energy consumption, serious environmental pollution, etc. The integrated multi-stage nanofiltration membrane separation device made of the special nanofiltration membrane for biomedicine can separate different components step by step at the same time, and separate the effective components of hundreds of small molecules in the medicine to achieve the quality of a class of medicine. standard. It can operate at room temperature and has low energy consumption. It is especially suitable for the separation and concentration of active ingredients and heat-sensitive substances in the pharmaceutical industry. It is a new technology and equipment urgently needed in the pharmaceutical industry to improve quality and reduce energy consumption.

Similarly, in the field of food and health products, the use of nanofiltration membrane physical separation method does not require high-temperature heat sterilization, that is, the color, aroma, taste, and nutrition of the juice during the concentration process are retained, and a lot of energy and human resources can be saved. ; The wines treated with nanofiltration membranes have a soft taste, sweet and clean, and separate and remove yeast, saccharification enzyme bacteria and off-flavor colloidal impurities from the wine, reducing formaldehyde, fusel oil, lead, manganese, and solids. The content of harmful substances such as type and cyanide.

"Nanofiltration membrane technology can solve several major technical problems in the production process of food and health products, such as loss of light, turbidity removal, and ripening. It is the best choice to replace traditional production processes and is currently the most advanced green environmental protection device in China." Jin Shujie Say.

The reporter discovered during the interview that my country’s nanofiltration membranes have now begun to be used in industrial cooling circulating water and water pollution treatment. However, due to the high price of imported products, the use is limited. Jilin Jinsai is a self-developed product in my country, and the price has dropped significantly, which is conducive to the promotion and application of membrane products.
"The hollow nanofiltration membrane products of various specifications developed by Jilin Jinsai have broad market application prospects. It is recommended to expand the production scale and increase the research and development of new products to meet the needs of domestic and foreign markets." Wu Guangxia said.

Solve the problem of secondary pollution of water quality
Judging from the current situation in my country, nanofiltration membranes not only have a broad market, but also produce higher economic and social benefits.

"At present, the places that have intentionally placed orders are Beijing, Shandong, Shanghai, Heilongjiang, etc. The total demand is 500,000 pieces, and the demand for membranes is about 550,000 square meters. The sales revenue can be more than 1 billion yuan, and the product market space is huge. The regional economic benefits are significant." Jin Shujie is more pleased that the drinking water direct drinking nanofiltration membrane device can effectively solve the technical problem of secondary pollution of water quality, provide safe and healthy direct drinking water, which can effectively prevent and avoid most of the causes. Physical illness caused by drinking water improves the physical fitness of the public.

Currently, most membrane technologies are still controlled by foreign companies. "The hollow fiber nanofiltration membrane device we developed is a new high-tech material. Its advent has effectively improved my country's separation membrane research and manufacturing level, and has significant social benefits in the fields of science and technology, manufacturing, and environmental protection." Jin Shujie said.