High-quality drinking water should be free of harmful substances but not lacking in minerals needed by the human body. In order to achieve such a goal, advanced treatment of drinking water requires: removing organic matter in the water as much as possible, especially toxic and harmful disinfection by-products and algal toxins, while retaining necessary minerals in the water.

Among them, microcotoxins (MCs) are a type of monocyclic heptapeptide substances released by aquatic algae such as cyanobacteria. They not only have a strong stench, but also are very toxic. They can strongly inhibit the activity of protein phosphatase. They are a kind of strong cancer promoters, and their way into the human body is mainly through drinking water and contaminated aquatic products. Epidemiological investigations have shown that long-term intake of trace amounts of algal toxins in humans has potential carcinogenic effects. Relevant data show that there is a statistical positive correlation between the high incidence of liver tumors in some places in Jiangsu, my country and the long-term consumption of water containing MCs. relationship. Since the 1990s, the scope of eutrophication in my country's water bodies has continued to expand. A large number of algae have been found in some major rivers and lakes that are used as drinking water sources. The problem of algal toxin pollution caused by explosive growth has become increasingly serious.

Because MCs have a stable cyclic polypeptide molecular structure, they are refractory biological toxins that cannot be decomposed by general proteolytic enzymes. They can withstand a wide range of acid and alkali environments and temperature conditions, and can exist for a long time under natural conditions without being photolysis or biodegradable. Reports have shown that microcystin can exist in dry algae residue for 6 months, and will be released into the water after wetting. Therefore, the rapid management and restoration of algal toxin-contaminated water bodies and the complete removal of algal toxins are urgent problems to be solved in recent years.

The enhanced photocatalytic drinking water treatment process adopted in this project is a new method and technology with great application prospects compared with the currently widely used nanofiltration membrane technology, ecological wetland technology, microbial treatment, deep oxidation methods, etc. It has high efficiency in removing microcystin and completely retains minerals beneficial to the human body. The effluent quality of this project technology can fully meet my country's latest drinking water indicators (the National Standard for Drinking Water Quality promulgated in 2006), and the removal rate of organic pollutants in the effluent mostly exceeds my country's national standard, which can reach the drinking water quality indicators of the United States (this standard is much stricter than my country's standard).