Phosphorus fertilizer production process will produce a large number of fluorine-containing wastewater, if the direct discharge without effective treatment, fluorine ions will cause serious harm to soil, water and the surrounding ecosystem, such as soil acidification, excessive fluorine pollution of water, affecting the growth of crops and aquatic organisms survival. Therefore, the research and development and application of fluoride removal agent in phosphate fertilizer production wastewater are particularly important.
The principle of defluorination agent in phosphate fertilizer production wastewater is mainly to make fluorine ions form insoluble precipitates or complexes through chemical reactions, so as to remove them from wastewater. Common defluoridation agents are calcium salts, such as calcium chloride, lime and so on. Lime, for example, contains calcium ions that combine with fluoride ions in wastewater to form calcium fluoride precipitates. Calcium fluoride has a very low solubility and can effectively reduce the concentration of fluoride ions in wastewater.
This class of defluoridation agents has significant advantages. First of all, it is cost-effective, and the price of calcium salt defluorination agents is relatively low, which can effectively control the cost in the treatment of large-scale phosphate fertilizer production wastewater. Secondly, the operation is simple, only the appropriate amount of defluorination agent is added to the wastewater according to the process, and after stirring, precipitation and other conventional steps, a certain defluorination effect can be achieved. In addition, the applicability is strong, and it can play a role in the common fluorine content range in the production of phosphate fertilizer and the water quality of wastewater.
However, there are some important points to pay attention to in practical application. Calcium salt defluorination may change the pH value of the wastewater, and the pH needs to be adjusted to meet the discharge standards. At the same time, the generated precipitation should be properly disposed of to prevent secondary pollution. In addition, with the increasingly stringent environmental requirements, some new high-efficiency defluorination agents such as metal oxide adsorbents and ion exchange resins have gradually been applied. They perform well in terms of defluorination efficiency, treatment accuracy, and adaptability to complex wastewater components, but at a relatively high cost.
Phosphorus fertilizer wastewater defluorination agent plays a key role in the environmental protection work of phosphate fertilizer industry. It helps enterprises achieve wastewater discharge standards, reduce the negative impact on the environment, and promote the transformation and upgrading of the phosphate fertilizer industry in the direction of green and sustainable. Enterprises should comprehensively consider the characteristics of wastewater, cost, environmental protection objectives and other factors, scientific selection and rational use of fluoride removal agents.
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