Summary of characteristics and development status of wastewater treatment using coagulant Summary of characteristics and development status of wastewater treatment using coagulant With the rapid development of industrialization, the rapid expansion of urbanization, water pollution, water scarcity and water problems come one after another, Urban water treatment systems continue to challenge. In recent years, with the continuous development of social economy, the following problems of water pollution give enormous room for development of water purifying agents such as polyaluminum chloride, polyacrylamide and ferrous sulfate. Since home water purifying agent enters the Chinese market , While the domestic people's pursuit of healthy quality also accelerated the development of water purification agent market. Coagulant is an important chemical that has emerged in recent years. Due to the wide range of applications and wide variety of coagulants, it is often used in various industrial sectors. Now, the domestic coagulation of inorganic salt coagulant, polymer coagulation and composite coagulant, etc., these coagulants have been strongly recommended by the industrial sector, in addition to good results, but also non-toxic. For this reason, these coagulants are often used in water treatment in addition to industrial raw materials. At present, due to the use of coagulant water treatment is a simple and easy operation and low cost method, it is now widely used at home and abroad. Commonly used coagulants are mainly polyaluminum chloride, aluminum sulfate and alum, these coagulants adaptability to a variety of water quality, the scope of its optimum pH is also wider, with good coagulation effect, and now Have also been the focus of the industrial sector and the parties concerned, but also has been heavily invested in technical projects. Nowadays, the global environmental pollution arouses people's attention, and the water treatment also has a strong governance. Coagulants and flocculants can be said to be an important water purification agent for wastewater treatment, and since these water purification agents do not corrode water treatment equipment, secondary pollution can be avoided and the effectiveness of the degradation of pollutants has been Accreditation, therefore, some coagulant has also become an indispensable tap water treatment water purification helper.