Recently, the reporter walked into the production base of Shandong Tianwei Membrane Technology Co., Ltd. The general manager of the company, Lian Wenyu, pointed to the light yellow synthetic fiber-like fabric that was continuously spitting out on the production line and told reporters: "This is our company's product-homogeneous ion exchange membrane, which carries our scientific and technological achievements for many years."

In the workshop, we talked as we walked. Lian Wenyu said: "For high-acid and high-alkali wastewater, traditional environmental protection methods are not easy to treat, with large investment and poor economic benefits. With our 'membrane' at the front end of the production process, the acid or alkali in the solution is extracted and returned to the production process, the recovery rate can reach 90%. If the enterprise used to produce 100 tons of acid per day, it must put in so much acid every day. With our membrane, we can now only replenish the lost 10 tons of acid every day. It not only saves resources, but also greatly reduces the cost of pollution control." The large-scale application of charged membrane will effectively solve the problem of water pollution control and greatly reduce the cost of treatment. A "membrane" turns waste and sewage into resources and even a "benefit generator".

Xinjiang Zhonghe Co., Ltd. enjoyed the benefits of the results earlier. Since 2004, they have successively invested more than 1400 million yuan to introduce more than 60 sets of charged membrane equipment, recycling nearly 130000 tons of acid a year, not only achieving sewage discharge standards, but also obtaining huge economic benefits. This membrane technology has also been tested in aluminum companies and has now entered the pilot stage. In production, not only can the alkali be fully recycled, but also the production efficiency is expected to be increased by about 20%, and the economic benefits are self-evident.

This high-performance series of charged membrane materials, by controlling the reaction conditions, can realize the precise control of the bromination position and the degree of bromination, and realize the independent control of the charged membrane ion exchange capacity and water content, which is more advantageous than other membrane methods. Rong Qiang, chief engineer of the company, made a vivid analogy: multiple membranes isolate the equipment into small rooms, some rooms will produce pure fresh water, and some rooms will flow out of high-concentration brine. The charged membrane separates the conductive ions from the non-conductive ions in the sewage and seawater, and finally achieves the purpose of recycling materials, treating sewage or seawater desalination through the principle of ion separation. Fu Rongqiang said that among the charged membrane series products currently developed and produced by the company, electrodialysis membrane, bipolar membrane, diffusion dialysis cathode membrane and diffusion dialysis anode membrane have all achieved major technological breakthroughs in industrialization. Prior to this, the domestic charged film has not yet achieved large-scale production, can only be imported from abroad at a high price. Some of the company's membrane products are at the leading level in China, among which diffusion dialysis positive membrane has no engineering application cases in the world.

Lian Wenyu said that the company has a variety of charged membrane products and a wide range of adaptations. The electrodialysis membrane can be used in seawater and brackish water desalination, natural water purification, pharmaceutical industry wastewater treatment and other fields. Diffusion dialysis cathode membrane is mainly used in iron and steel, hydrometallurgy, rare earth and other non-ferrous metal smelting and other industrial fields of waste acid recovery and resource utilization, at present, the technology has been in Zijin Mining, Xining Special Steel, Jiangxi Copper and Jiangsu Xingda and other more than 100 enterprises to promote the application. The diffusion dialysis membrane is used for the separation and purification of alkali and metal salt mixture, and can be used for the recovery of waste alkali in non-ferrous metal smelting, organic chemical industry, papermaking, printing and dyeing industries. Bipolar membranes are used in the production of organic acids and organic alkalis, acid gas removal, resource utilization of saline wastewater, zero-discharge engineering, and clean production of food and chemicals.

Relying on these technologies, Shandong Tianwei Membrane Technology Co., Ltd. has become a key high-tech enterprise of the National Torch Plan. It has established the Shandong Provincial Charged Membrane Demonstration Engineering Technology Research Center, the Shandong Sino-German Charged Membrane Material Cooperative Research Center and the academician workstation, and presided over two The national "863" plan and major projects of independent innovation in Shandong Province have become a leading enterprise in my country's charged membrane material manufacturing industry. Today, the company has a homogeneous membrane production technology with independent intellectual property rights, authorized 7 invention patents, utility model patents 8, homogeneous membrane production line is completed, can achieve an annual output of 100000 square meters of ion exchange membrane and diffusion dialysis membrane, annual output of bipolar membrane. 20000 square meters capacity.

For this project, Weifang Binhai Economic and Technological Development Zone has high hopes. Wang Shuhua, vice mayor of Weifang City and director of the Management Committee of Binhai Economic and technological Development Zone, told reporters that the technology carries out front-end treatment and recycling of high-acid, high-alkali and high-salt wastewater, which has a unique advantage in pollution control cost. Some chemical, pharmaceutical and smelting enterprises that are difficult to sustain because of the high cost of pollution control will be reborn. At the same time, using this technology to desalinate seawater has obvious cost advantages and the market prospect is extremely broad. Wang Shuhua said that Weifang will firmly grasp such a batch of strategic emerging industries, make them bigger and stronger as soon as possible, and play a greater leading role in promoting industrial transformation and upgrading. (Economic Daily reporter Shan Baojiang)