Method for removing fluorine, ferrum and manganese in underground water by composite oxidation coagulant agent and ultrasonic waves

Abstract

The coexistence of fluorine, ferrum and manganese in underground water of the northeast is a common phenomenon. Existing researches are mainly directed at methods for removing individual contaminants. The invention discloses a method for removing the fluorine, ferrum and manganese in underground water by a composite oxidation coagulant agent and ultrasonic waves, wherein the composite oxidation coagulant agent is composed of potassium ferrate and polymerized ferric chloride. Ferric ions and manganese ions in water are oxidized under reinforcement of the ultrasonic waves, and the fluorine ions, the ferric ions and the manganese ions are removed simultaneously by coagulating sedimentation. In addition, the composite oxidation coagulant agent has a function of disinfection and sterilization. The method of the invention can improve oxidation and coagulation effects, decrease agent dosage, and reduce cost, and has the advantages of high efficiency, rapidness, no secondary contamination, and the like.

Description

technical field [0001] The invention proposes a method for removing fluorine, iron and manganese from groundwater by combining a composite oxidation coagulant with ultrasonic waves, and belongs to the technical field of groundwater pollution restoration. Background technique [0002] It has been medically proven that long-term drinking of groundwater with excessive fluoride can lead to diseases such as dental fluorosis and skeletal fluorosis. At present, some of the people whose drinking groundwater fluorine content exceeds the national health standard (1mg / L) suffer from fluorine disease, mainly distributed in the northeast, north and northwest regions. At the same time, these areas also generally have the phenomenon that the groundwater iron and manganese exceed the standard. Excessive intake of iron and manganese by the human body can cause pathological changes in certain organs. Long-term drinking of water with excessive iron and manganese will cause chronic poisoning ...

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Problems solved by technology

However, the basis of these methods is adsorption, and the adsorption method has its own defects: first, in a limited space, the adsorption capacity of the material is limited. When the adsorption saturation is reached, regeneration or replacement of the filler is required. On the one hand, regeneration cannot guarantee complete recovery of adsorption. Capacity, on the other hand, the regeneration fluid needs to be treated twice, and the replacement packing also needs to be properly handled

However, the stability of potassium ferrate is poor, it is easy to decompose itself in acidic water, and the strong oxidation performance is weakened

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