Supe, Arizona is the capital of the hawasupe Indian reservation in the Grand Canyon of the western United States. With one of the most beautiful waterfalls in the United States, the reserve is popular with hikers and backpackers. In 2006, a new and more stringent law of the United States Environmental Protection Agency (USEPA) came into effect, stipulating that the MCL content limit of arsenic was 10ppb, and the water treatment plant in hawasupe was found not to meet the requirements. The use of chlorination alone to treat arsenic pollution is very common in Arizona and its surrounding states, and the arsenic content of water sources in the reserve is between 10 – 12ppb - lower than other places in the region, but still higher than EPA standards.

　　Hawasupe reserves responded by looking for a water treatment system to help it reduce arsenic levels to meet EPA standards. Finally, they chose the sorb 33? Arsenic removal system of shuihuan pure water and used Bayoxide? E33 arsenic removal medium for arsenic removal. The use of the reserve has opened a new era of product cooperation. At present, about 150 kinds of sorb systems have been used in water treatment equipment in the whole west and southwest.

　　In China, the surface water quality is slightly polluted. At the same time, groundwater pollution is serious in China, and only 3.1% of them have good water quality. Arsenic in surface water of Shenzhen River (located in Guangdong) in Pearl River Basin, Shuangqiao River (located in Henan) and Qinhe River (located in Shanxi and Henan) in Yellow River Basin, and Dongga section of duilong River (located in Tibet) in Southwest River Basin exceeded the standard.

　　Arsenic, which ranks 33 in the periodic table of chemical elements, is best known for its oxide, arsenic. Arsenic will seep into groundwater from the stratum. Drinking groundwater with excessive arsenic for a long time will easily lead to drinking water type endemic arsenism (referred to as "endemic arsenism"), and even lead to lung cancer, skin cancer and other cancers. Because of the lack of water, as early as the 1960s, Chinese residents began to use tube wells (also known as hand killing wells) to draw groundwater as drinking water. Sun Guifan, Professor of School of public health of China Medical University, pointed out in an interview with China Youth Daily in 2013: "the groundwater pumped out by hand killing well is likely to be polluted by arsenic. Due to the influence of many factors such as geology and geochemistry, arsenic is easily dissolved into water from the underground strata." The recommended value of arsenic content in groundwater given by who is 0.01 mg per liter of water. If the long-term drinking groundwater exceeds this value, it will cause arsenic harm. In an interview with China Youth Daily, sun Guifan also pointed out: "arsenic is the first category of human carcinogens recognized by the international cancer organization, which is an important reason for the global attention to it."

　　In order to change the traditional concept of taking water from tube wells in remote mountainous areas, the Chinese government provides arsenic removal equipment and encourages the use of tap water to improve the health of drinking water. In this regard, in 2006, the Ministry of health of the people's Republic of China issued the comprehensive implementation of the "drinking water health standard" in 2012, which revised: the content of arsenic should not exceed 0.01mgl. The content of arsenic in the drinking water supply system of EU countries in 2003 was 0.01mgl, and the arsenic standard of China's drinking water was in line with international standards. This also means that more and more excellent arsenic removal systems in the world will serve China.

　　Currently, there are mature system solutions for arsenic removal in the world. The sorb33 arsenic removal system mentioned above is the world's leading arsenic removal system. The operation is simple, no need to clean and update, the steps are not complex, and a lot of labor is not needed. It is an obvious economic and effective arsenic removal system. It is a fixed bed adsorption system, which uses a simple "extraction treatment" process to extract well water or spring water through a fixed bed pressure vessel containing iron oxide medium. Arsenic has a high affinity for iron oxide minerals, which can be quickly adsorbed on the surface of the medium. This allows granular iron oxide media such as Bayoxide to effectively remove arsenic. Arsenite (trivalent arsenic III) and arsenate (pentavalent arsenic V) oxygen anions in water can be removed by oxidation, adsorption, retention (adhesion) or formation of solid solution through reaction with ferric oxide.

　　Other common groundwater pollutants also have high affinity for iron-based minerals. This results in the competition between ions, resulting in the reduction of arsenic adsorption per unit volume of purified water. However, Bayoxide E33? Is not only specially used for arsenic adsorption, but also can reduce competition among other ions, thus improving the potential of medium for arsenic adsorption.

　　In addition to lower procurement costs and smaller footprint, the operation and maintenance costs of sorb system and Bayoxide media are also significantly lower than those of traditional coagulation / filtration processes. In the future, sorb 33? Arsenic removal system will also provide the same excellent arsenic removal equipment and services for arsenic contaminated areas in China through shuihuanchun company.

　　About Severn Trent services

　　Severn Trent services (STS), headquartered in Fort Washington, Pennsylvania, is the world's leading provider of water and wastewater treatment solutions. The company has a wide range of products and services, mainly engaged in disinfection, instrumentation, filtration technology and contracted operation. In the United States, the United Kingdom, Ireland and Italy, our operation service business provides contracted operation services, and fully supports the operation development and business transformation of water supply and sewage utilities. STS is a member of Severn Trent PLC (London Stock Exchange code: SVT. L). Severn Trent is a FTSE 100 index company.