In industrial production, the vast majority of raw materials contain fluorinated chemicals, and fluorinated chemicals are also added during the production process, leading to the problem of fluorinated wastewater. Its origin mainly comes from the extraction of fluorine minerals, chloride generation, smelting plants of rare earth oxides and metals, aluminum electrolytic refining, electroplating process, coke, thermal power plants, laminated glass, fluorosilicates, fertilizers, concrete, brick kilns, stainless steel material acid pickling and passivation, fertilizers, fluorochlorocarbons, ceramics, cleaning of silicon household appliance parts, petrochemical equipment and other traditional industries; In addition, organic chemical plants, electronic device integrated circuit chip industry production, nuclear energy, and other industries in industrialization also produce fluorine-containing chemicals. Fluorine mainly exists in the structure of fluorosilicic acid, hydrochloric acid, and other chloride salts, and at the same time, the fluoride content in different types of wastewater also varies. Therefore, due to its involvement in numerous pollutants, the difficulty coefficient of solution is enhanced. For relatively high concentrations of fluoride, efficient solutions can generally be achieved through multiple forms of fusion to ensure that its concentration meets the environmental protection standards for industrial production wastewater, which is less than 10mg/L. If the fluoride concentration is reduced to 1.0mg/L in drinking water, it is necessary to use adsorbents to carry out multi-level adsorption solutions. Therefore, with the increasing consumption of fluorine-containing wastewater in China, it is crucial to improve the solution and complete the recycling and reuse of fluoride resources. There are many methods for treating fluorine-containing wastewater. Currently, the most commonly used wastewater treatment processes in engineering projects are chemical precipitation, flocculation precipitation, and adsorption. Below, the editor will take you to understand.

1. The application of chemical precipitation method can solve fluoride containing wastewater with relatively high concentration. When the initial concentration of fluoride ions is 1000-300mg/L, the final concentration treated by lime powder method exceeds 20-30mg/L. This method has a simple operation process and low solution cost. However, due to the slow sedimentation rate of the sludge, it is necessary to add calcium chloride or other coagulants to accelerate the sedimentation. Finding ways to increase the concentration of sodium ions and maintain a high pH to reduce the settlement of calcium fluoride foundation is a practical method to reduce the fluoride ion concentration coefficient. In addition, the collaborative use of polyphosphates, magnesium salts, aluminum salts, etc. has a significant effect on fluoride removal compared to simply using calcium.

2. The expected effect of flocculation precipitation method on fluoride removal in fluorine-containing water with relatively high concentration is poor, and the concentration of sulfate ions in the processed water is relatively high.

3. The adsorption method can be used to solve the problem of drinking water depth with relatively small water output. Most of the adsorbents play a cation exchange role, so the expected effect of fluoride removal is very obvious. However, modification agents and unique mechanical equipment need to be added to solve the problem. The cost is generally higher than that of the ion exchange method, and the operation process is complex. The use of emerging adsorbents such as hydroxyapatite active magnesium oxide rare earth oxide metal oxide can improve the expected solution effect.

4. For fluoride containing wastewater with relatively high concentration, a two-step solution is generally required. Firstly, lime powder is used for sedimentation to reduce the fluoride content to 20-30mg/L, and then an adsorbent is used to solve the problem and reduce the fluoride content to below 10mg/L. Chemical precipitation and flocculation precipitation techniques can also be used to solve the problem. At this point, chemical agents are required to solve the problem with excellent results. Currently, Huanrui's product research and development of efficient fluorine removal agents F1 and F2 can reduce the concentration of fluoride ions in wastewater to below 10mg/L using only chemical precipitation and flocculation precipitation, without the need for adsorbents.

专业水处理的疑难问题，产品选型问题，可以单击下面的微信二维码电话联系贺工在线指导，长按微信二维码可自动识别添加贺工微信沟通解决您的疑难问题