Method for reclaiming fluorine-containing and ammonia nitrogen-containing waste water in electronic industry

Abstract

The invention relates to a method for reclaiming fluorine-containing and ammonia nitrogen-containing waste water in electronic industry. In the method, waste water passes through a three-in-one integral device formed by the sequential series connection of a waste water treatment plant treating process, a water works treating process and a pure water treatment plant treating process to obtain reclaimed water. The device for implementing the waste water treatment plant treating process comprises a conditioning tank, a reaction tank and a clarifying tank; the device for implementing the water works treating process comprises a quartz sand filter tank, an ozone contact tank and an activated carbon filter tank; and the device for implementing the pure water treatment plant treating process comprises an ultrafiltration membrane device and a cleaning-resistant reverse osmosis membrane device, and thick water produced by the cleaning-resistant reverse osmosis membrane device can be reclaimed or not to obtain the reclaimed water according to the reclamation rate requirement and environmental impact assessment requirement of a reclamation customer. The reclaimed water treated by the invention has stable and favorable quality, meets and surpasses the leading indicators of GB5749-2006 Standards for Drinking Water Quality issued by China, and can be used as primary pure water for industrial production.

Description

technical field [0001] The invention belongs to the technical field of waste water treatment, and in particular relates to a recycling method for 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 situatio...

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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