Water treatment method for fully utilizing resources in high-fluorine and high-ammonia nitrogen wastewater

Abstract

The invention discloses a water treatment method for fully utilizing resources in high-fluorine and high-ammonia nitrogen wastewater. The treatment method comprises the following steps: (1) adding a calcium salt to the wastewater, performing stirring and uniform mixing to form a calcium fluoride precipitate, and filtering the obtained solution; (2) adding sulfuric acid to a filtrate obtained through filtration in step (1), performing stirring and uniform mixing to form a calcium sulfate precipitate, and filtering the obtained solution; (3) continuously adding water to a filtrate obtained by filtration in step (2), carrying out reduced pressure distillation, and cooling and refluxing the obtained distillate to recover hydrochloric acid; and (4) adding ammonia water to a remaining solution obtained after distillation in step (3) to adjust the pH value, carrying out reduced pressure distillation, and collecting obtained ammonium sulfate crystals. The method has the advantages of easinessin control of conditions, mature process, no secondary waste, high economic values of the product, and realization of complete recycling and full utilization of ammonia nitrogen and fluorine in the wastewater.

Description

technical field [0001] The invention relates to the technical field of treating wastewater containing fluorine and ammonia nitrogen, in particular to a water treatment method that fully utilizes resources in wastewater containing high fluorine and high ammonia nitrogen. Background technique [0002] The source of high fluorine and high ammonia nitrogen wastewater is mainly the wastewater discharged from the production of steel, feed, coking, pharmaceutical, fertilizer, petrochemical, aquaculture, glass manufacturing and other industries. The ammonia nitrogen in the wastewater is an important substance for water eutrophication and environmental pollution, which is easy to cause Algae and other microorganisms multiply in the water, and the operation of the water treatment plant is difficult, causing the drinking water to smell, and in severe cases, the dissolved oxygen in the water will drop, a large number of fish will die, and even the lake will dry up and perish. On the oth...

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Problems solved by technology

[0002] The source of high fluorine and high ammonia nitrogen wastewater is mainly the wastewater discharged from the production of steel, feed, coking, pharmaceutical, fertilizer, petrochemical, aquaculture, glass manufacturing and other industries. The ammonia nitrogen in the wastewater is an important substance for water eutrophication and environmental pollution, which is easy to cause A large number of algae and other microorganisms in the water will multiply, and the operation of the tap water treatment plant will be difficult, resulting in the odor of drinking water. In severe cases, the dissolved oxygen in the water will drop, a large number of fish will die, and even the lake will dry up and perish.

On the other hand, ammonia nitrogen will also increase the amount of chlorine used in water supply disinfection and industrial circulating water sterilization; it is corrosive to some metals (copper); when sewage is reused, ammonia nitrogen in regenerated water can promote water pipelines and water consumption. The reproduction of microorganisms in the equipment, the formation of biofouling, blockage of pipes and water equipment, and affect the heat exchange efficiency

Fluorine is a trace element in wastewater. Drinking water with a fluorine content of 0.4-0.6 mg / L is harmless and beneficial to the human body, while long-term drinking of high-fluorine water with a content greater than 1.5 mg / L will bring disadvantages to the human body. Affects, severe cases can cause dental fluorosis and bone fluorosis

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