Comparison of Several Processes for Removing Fluoride from Coal Chemical Wastewater

Abstract

Fluorine-containing industrial wastewater treatment is a hot topic of current concern of many enterprises. With the intensification of industrial production, the discharge of high-concentration fluorine-containing industrial wastewater is also increasing. Coal mine water, coal chemical industry, photovoltaic industry, fluorinated chemical industry, metal smelting industry, electroplating industry, electronics industry and other industries all have fluorine-containing wastewater and need to be treated in depth before they can be discharged or reused. These enterprises contain fluorine The wastewater fluorine concentration is generally above 10mg/L. Failure to meet the standards will not only pollute the environment, but also threaten human health. And because the nature of the industry is different and the location of the company is different, the implementation standards for the treatment of fluoride are also different. The most stringent at present is to achieve less than 1mg/L .China's energy structure is “rich coal”, which determines the national conditions of China's coal and coal chemical industry. The development of modern coal chemical industry, especially the chemical industry led by coal gasification, can promote the sustainable development of China's chemical industry. However, the coal chemical industry consumes huge amounts of water, produces large amounts of waste water, has complex water quality, high pollutant concentrations, and difficult treatment. Coal chemical wastewater treatment is currently a recognized problem in domestic sewage treatment. The search for wastewater treatment technology with good treatment effect, stronger process stability and lower operating cost has become the own and external requirements of the development of coal chemical industry. There are some problems in the treatment of fluorine-containing wastewater, such as unstable water quality, excessive use of chemicals, large amount of sludge and high water content. Especially with the rapid development of electronic information industry in recent years, and the international environmental standard ISO14000 has been generally recognized in the world, it has become an important task for the industry to fundamentally solve the problem of fluorine-containing wastewater treatment.