Method for resourceful treatment of ammonia chloride wastewaters

Abstract

The invention relates to a method for resourceful treatment of ammonia chloride wastewaters. The method comprises the following steps: (1) respectively carrying out pretreatment on ammonia chloride wastewater with different concentrations for removing impurities; (2) carrying out reverse osmosis treatment on a clear liquor of the ammonia chloride wastewater, which is obtained in the step (1), with the concentration being lower than 0.5%; (3) mixing obtained reverse osmosis concentrated water with a clear liquid of the ammonia chloride wastewater, which is obtained in the step (2), with the concentration being higher than 0.5% so as to obtain ammonia chloride mixed wastewater; (4) carrying out conventional electrodialysis treatment on the obtained ammonia chloride mixed wastewater so as to obtain electrodialysis fresh water; (5) returning the obtained electrodialysis fresh water, carrying out reverse osmosis treatment the obtained electrodialysis fresh water to obtain electrodialysis concentrated water, and carrying out acid-alkali regeneration on the electrodialysis concentrated water by adopting bipolar membrane electrodialysis; and (6) converting ammonia chloride in the wastewater into hydrochloric acid and ammonium hydroxide by adopting the bipolar membrane electrodialysis to obtain low-concentration ammonia chloride wastewater, simultaneously returning the obtained low-concentration ammonia chloride wastewater and carrying out the conventional electrodialysis treatment on the obtained low-concentration ammonia chloride wastewater. According to the method, the resourceful treatment and the zero emission of the ammonia chloride wastewater can be really achieved.

Description

technical field [0001] The invention relates to the field of ammonium chloride wastewater treatment technology, in particular to a resource-based treatment method for converting ammonium chloride in wastewater into hydrochloric acid and ammonia water with bipolar membrane electrodialysis technology as the core. Background technique [0002] A certain amount of ammonium chloride wastewater will be produced in the production process of fertilizers, rare earths, printing, electroplating and other products. The ammonia nitrogen and chloride ions in this wastewater will pollute the water body. With the rapid development of my country's social economy and the scale of industrial production, the amount of ammonium chloride wastewater produced is also increasing. If the waste water is directly discharged, it will not only increase the production cost of the enterprise, but also cause pollution to the environment. With the strengthening of national environmental protection and the r...

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Problems solved by technology

[0008] Aiming at the problems of high energy consumption, serious equipment corrosion, and low-value products obtained by using reverse osmosis, electrodialysis and evaporation technologies to treat ammonium chloride wastewater, the present invention proposes to use bipolar membrane electrodialysis acid-base regeneration technology to remove the Ammonium chloride is converted into hydrochloric acid and ammonia water. At the same time, coupled with electrodialysis and reverse osmosis technology, the ammonium chloride wastewater is desalinated and concentrated, so that the desalted fresh water meets the requirements of reuse, and the concentrated water meets the requirements of bipolar membrane electrodialysis. Really realize the resource treatment and zero discharge of ammonium chloride wastewater

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