Fluoride is an important trace element in human body. Fluoride is widely distributed in nature in the form of fluoride ions. Fluoride is an indispensable component of teeth and bones. A small amount of fluoride can promote the resistance of enamel to acid bacterial corrosion and prevent dental caries. However, long-term intake of excessive fluoride can lead to dental fluorosis and skeletal fluorosis, which can lead to bone deformation, paralysis and loss of labor capacity. Therefore, China's drinking water sanitation standard stipulates that the fluorine content in drinking water must be less than 1.0 mg/L.
Fluoride pollution in drinking water mainly comes from the geological structure of the earth, which is a serious problem worldwide. According to the report of the World Health Organization 《Fluoride in Drinking-Water》, there are more than 28 countries in the world with different degrees of excessive fluorine, mainly distributed in China, India, Spain, Argentina, Brazil, Kenya, Tanzania, Canada and other countries, among which China and India are the most polluted nations. In addition to Shanghai, other provinces and cities in China have reported excessive fluoride in drinking water, especially in areas where water resources are scarce in the north. More than 70% of India's population is in high-fluoride areas.
In order to solve this problem, our team members began to study new materials for fluoride removal and water purification in 2005, and obtained patent technology for fluoride removal, and made a series of breakthroughs in the field of fluoride removal of drinking water.