What is the method for fluorine-containing wastewater? Sewage treatment equipment company introduces you to the fact that excessive fluorine in water can cause symptoms of fluorosis and dental fluorosis. In China, the water content of fluorine exceeds a small part of natural causes, most of which are chemical. Industrial wastewater is formed in disorder. The concentration of F- from the standard discharge water does not exceed 10 mg·L-1, which is one of the more difficult to treat industrial wastewater. The currently used sewage treatment equipment processes include precipitation and adsorption methods. In addition, there are freezing method, ion exchange resin defluoridation method, activated carbon defluoridation method, ultrafiltration defluoridation method, electrodialysis method, and fluorine removal process, mainly because of high cost and low defluoridation rate. Company use.
Based on the experimental experience combined with chemical precipitation and flocculation precipitation, based on the precipitation of calcium salt, it was found that NaOH was used to adjust the pH of the wastewater, CaCl2 was used as the precipitation reagent and assisted the coagulation and precipitation of PAC. The effluent fluoride ion concentration was less than 4mg·L-1. , to meet emission standards, the effect is stable. The wastewater was adjusted to pH neutral or alkaline with 25% NaOH. After adding CaCl2 (2240 ​​mg·L-1) for 1 hour, PAC was added as a coagulant, and the concentration was 400 mg·L-1. After 10 minutes of reaction, the reaction was carried out for 10 minutes. After precipitation for 2h, the fluoride ion concentration in the effluent is less than 4mg·L-1, which is much smaller than the 10mg·L-1 required in the discharge standard, and also less than the solubility of calcium fluoride 8.9mg·L-1, and the effect is stable. Sewage treatment equipment company analysis: This is because when the water contains soluble calcium salts such as calcium chloride and calcium sulfate, the solubility of calcium fluoride is lowered due to the same ion effect, so that the fluoride ion concentration in the effluent is greatly reduced.
In the practice of the enterprise, NaOH is used to adjust the pH value of the wastewater, and CaCl2 is used as the calcium salt. The solubility is large, the dissolution and dosage are convenient, the operation is convenient, the equipment investment is small, and the power consumption is small. At the same time, the same ion effect produced by CaCl2 effectively reduces the fluoride ion concentration of the effluent and stabilizes the effluent effect. If there is fluorine in the industry, the above-mentioned sewage treatment equipment process can be selected.
Plant extracts refer to substances extracted or processed from plants (all or a part of plants) using appropriate solvents or methods, and can be used in the pharmaceutical industry, food industry, daily chemical industry and other industries.
There is a conceptual overlap between plant extracts and herbal extracts. The raw materials of plant extracts in my country are mainly derived from Chinese herbal medicines, so domestic plant extracts can also be called Chinese medicine extracts to some extent.
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