Smoke wet desulfurizing and denitrifying wastewater resource treatment system and method

Abstract

The invention discloses a smoke wet desulfurizing and denitrifying wastewater resource treatment system and method. The system comprises a coagulating sedimentation system, a nanofiltration membrane system, a sulfate evaporative crystallization system, an anionic exchange system, a nitrate evaporative crystallization system, an electrolytic bath system, a NaOH solution storage recycling system, aCl2 storage metering injection system, an H2 storage system and a smoke recycling system. According to the system, sulfate and nitrate in the desulfurizing and denitrifying wastewater serving as a rawmaterial realizes resource recycling through integrated innovation of the process, and oxidant Cl2 and NaOH absorption liquid essential to smoke desulfurization and denitrification can be prepared byelectrolysis, so that the smoke treatment cost is greatly reduced. Furthermore, the process can generate clean energy H2 at the same time, the H2 can be used as a domestic air source, smoke pollutants can be economically and efficiently removed while resource utilization and zero discharge of the smoke desulfurizing and denitrifying wastewater can be realized.

Description

technical field [0001] The invention belongs to the field of industrial waste water treatment, and in particular relates to a process system and method for resourceful treatment of flue gas wet desulfurization and denitrification waste water. Background technique [0002] In recent years, flue gas wet simultaneous desulfurization and denitrification technology has been demonstrated and applied in my country's industrial boilers and industrial kilns, and achieved good SO 2 , NOx control effect. But this technology also has some problems, such as the treatment and disposal of the absorption tail liquid. Wet simultaneous desulfurization and denitrification technologies can be mainly divided into three categories: oxidation type, reduction type, and complexation type according to different NOx removal mechanisms. Among them, oxidation type simultaneous desulfurization and denitrification technology is a kind of existing wet desulfurization technology (mainly Sodium-alkali meth...

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Problems solved by technology

At present, enterprises usually discharge desulfurization and denitrification wastewater into wastewater treatment stations directly or after simple coagulation and sedimentation, without considering the reuse of a large number of inorganic ions in wastewater and their impact on the discharged wastewater treatment system

Invention patent 201711342100.2 discloses a zero-discharge device for desulfurization wastewater. For power plant limestone-gypsum desulfurization wastewater, mechanical filtration-redox reaction membrane stack technology is used to separate solid substances in wastewater and return them to the desulfurization system. Electrolysis of wastewater produces Cl 2 and NaOH, where Cl 2 It is used to sterilize and kill algae in the cooling circulating water of the power plant, and NaOH is used in the desulfurization system, but the invention patent is only for the desulfurization wastewater of the power plant, and does not involve SO 4 2- , NO 3 - Reuse of resources, and the reuse of separated solids will cause the concentration of solids in the absorption liquid to be too high, resulting in risks such as blockage of pipes and nozzles

Invention patents 201711315966.4, 201810110709.5, etc. all disclose treatment technologies for power plant desulfurization wastewater, but none of them involve high concentrations of SO 4 2- , NO 3 - , Cl - , and Na + Wastewater resource disposal technology, and technology that combines wastewater treatment with waste gas treatment

[0003] It can be seen that the existing research on flue gas treatment wastewater is mainly aimed at desulfurization wastewater from power plants, but there are few reports on the treatment of simultaneous wet desulfurization and denitrification wastewater, especially for SO in desulfurization and denitrification wastewater. 4 2- , NO 3 - , Cl - There are no reports on the technology development and application of resource reuse and the combination of wastewater treatment and flue gas treatment.

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