Method for completely recycling wastewater containing fluorine and ammonia nitrogen in electronic industry

Abstract

The invention relates to a method for completely recycling wastewater containing fluorine and ammonia nitrogen in an electronic industry. By the method, the wastewater passes through a 'three plants-in-one' integrated device formed by serially connecting a wastewater treatment plant treatment process, a tap water plant treatment process and a pure water treatment plant treatment process in turn to obtain recycled water. Devices of the wastewater treatment plant treatment process comprise a regulation tank, a reaction tank and a clarification tank; devices of the tap water plant treatment process comprise a quartz sand filter tank, an ozone contact tank and an activated carbon filter tank; and devices of the pure water treatment plant treatment process comprise ultrafiltration membrane equipment, washable reverse osmosis membrane equipment, reverse osmosis membrane concentration equipment and an evaporation system. By the method, the wastewater can be completely recycled, the water quality of the recycled water has high stability, and achieves and is superior to main indicators of GB5749-2006 'Sanitary Standard for Drinking Water' issued by the nation, and the recycled water can serve as primary pure water used in industrial production.

Description

technical field [0001] The invention belongs to the technical field of waste water treatment, in particular to a method for regenerating and reusing all waste water containing fluorine and ammonia and nitrogen in the electronics industry. Background technique [0002] With the development of electronic industry technology, especially integrated circuit chip industry technology, the treatment of electronic industrial wastewater, especially electronic industry wastewater containing fluorine and ammonia nitrogen, has become a prominent problem in the water treatment industry. The electronics industry usually uses a large number of chemicals such as hydrofluoric acid, sulfuric acid, phosphoric acid, ammonia water, hydrochloric acid, and organic solvents in the production process, making the discharged wastewater contain a large number of components that pollute the surrounding environment, which has aggravated my country's water pollution. and the severity of the water shortage s...

AI Technical Summary

Problems solved by technology

Due to the poor biodegradability of this type of wastewater (BOD / COD<0.1), and due to the limitations of the process technology of urban sewage treatment plants, the total nitrogen in the effluent is often not up to the standard, which may easily lead to eutrophication of the discharged water, especially for some specific Pollutants (such as fluorine) cannot be effectively removed but can only be reduced by dilution

Facing the increasingly serious ecological environment, the state requires industrial enterprises to implement the policy of "energy saving and emission reduction". In the environmental impact assessment approval for large water users of industrial enterprises, in addition to requiring the discharge of waste water to meet the standard, it also clearly requires that waste water must reach a certain reuse rate , conventional treatment methods can no longer effectively reduce the discharge of pollutants, and it is even more impossible to effectively reduce the discharge of wastewater through wastewater regeneration and reuse, and realize a circular economy

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