Electrical deionization device for concentration during recycling of low-concentration ammonia-nitrogen wastewater

Abstract

The invention discloses an electrical deionization device for concentration during recycling of low-concentration ammonia-nitrogen wastewater. The device consists of membrane stacks, electrodes, fastening pieces and concentration pieces. The whole device is in a modularization structure, the number of modules in series connection is determined by the concentration of ammonia-nitrogen wastewater to be processed, and the number of modules in parallel connection is determined by the capacity of the ammonia-nitrogen wastewater to be processed. The concentration of ammonia nitrogen in the effluent from an electrodialyzer is smaller than 250mg / L, after the effluent is treated by the device consisting of one-stage or multi-stage membrane stacks, which is disclosed by the invention, the concentration of the ammonia nitrogen in the effluent water can be smaller than 1mg / L. Concentrated water, which is obtained by the concentration of the device disclosed by the invention, can return to the front end of a system so as to be totally recycled. The zero discharge of an ammonia-nitrogen wastewater recycling system is realized, so that environmental problems are solved, and economic benefits and benefits fo environmental protection are achieved due to the recycling of chemical materials and pure water for technological use. The electrical deionization device disclosed by the invention has the advantages that the technology is advanced, the operation cost is low, and the energy is saved, so that the clean and civilized production is realized.

Description

technical field [0001] The technical field of the present invention relates to a device for concentrating industrial ammonia-nitrogen wastewater, in particular to using a specific and dedicated electrodeionization device to process industrial wastewater of low-concentration ammonia-nitrogen compounds produced by chemical fertilizers and chemical industries. Use the chemical materials and process pure water contained in the wastewater to achieve zero discharge of wastewater, so that the wastewater no longer pollutes the environment. Background technique [0002] In the production process of chemical fertilizers and chemical enterprises, especially ammonium nitrate, ammonium chloride and ammonium sulfate production enterprises, while producing these chemical products, a large amount of ammonia nitrogen wastewater is produced, which seriously pollutes the environment. [0003] It is difficult to use the commonly used wastewater treatment methods to treat this kind of wastewater...

AI Technical Summary

Problems solved by technology

[0003] It is difficult to use the commonly used wastewater treatment methods to treat this kind of wastewater, and the treatment effect is not ideal:

[0004] 1. Biological oxidation method: only under certain conditions, the ammonia nitrogen in the wastewater can be oxidized, but the contained chemical materials cannot be recovered;

[0005] 2. Ion exchange method: ammonium salt can be recovered, but frequent regeneration is required;

[0006] 3. Reverse osmosis method: the recovery rate of water is low, due to the NH 4 + and NO 3 — The interception rate of ions is low, so that the water quality of the effluent treated by reverse osmosis is not good;

[0007] 4. Electrodialysis: high power consumption and high operating costs

After investigation, it was found that enterprises that use electrodialysis to treat ammonia nitrogen wastewater have difficulties in meeting the above discharge standards.

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