Pilot scale experimental study on fluoride removal by chemical precipitation combined with high efficiency solid-liquid separator

With the rapid economic development and frequent industrial production, more and more wastewater is generated from industrial production, and the problem of fluorine-containing wastewater has become more and more serious. Therefore, it is particularly important to be able to effectively treat fluorine wastewater and optimize the existing fluorine removal technology at this stage. The pilot study aimed at the high-efficiency and low-cost de-fluoridation treatment of industrial fluorine-containing water, and used a high-efficiency solid-liquid separator to optimize the chemical precipitation method with a chemical plant in Shandong Province's refrigerant production alkali washing wastewater as the object of treatment. A pilot study on fluoride removal was carried out. The test results show that the best operating condition of the process is when the pH is 6, the water flow rate is 100L/h, the stirring speed is 200r/min, and the calcium chloride dosage is Ca2+: F− reaches 10:1. The residual fluoride ion concentration in the effluent is 0.66mg/L, which can effectively remove the fluoride ion concentration in the fluorine-containing wastewater and ensure the long-term stable operation of the equipment.