Method for resourceful treatment of ammonia chloride wastewaters

A ammonium chloride and recycling technology, applied in the field of resource recycling, can solve problems such as high energy consumption and equipment corrosion, and achieve the effects of zero emissions, increased concentration, and reduced energy consumption

Active Publication Date: 2015-03-25
JIANGXI INST OF RARE EARTHS CHINESE ACAD OF SCI
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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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  • Method for resourceful treatment of ammonia chloride wastewaters

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Embodiment 1

[0036] Embodiment 1 Ammonium chloride wastewater electrodialysis desalination and concentration

[0037] Ammonium chloride wastewater was desalted and concentrated by conventional electrodialysis technology, and the effect of electrodialysis desalination and concentration of ammonium chloride wastewater with different initial concentrations was investigated. Prepare ammonium chloride wastewater with a salt content of 0.5%, 1%, 1.5%, 2% and 5%, and treat them with conventional electrodialysis technology. Studies have shown that with the increase of the initial concentration of ammonium chloride wastewater, the longer it takes for the salt content of electrodialysis fresh water to drop below 0.5% under constant pressure conditions, the more stages of electrodialysis membrane stacks are required. As the salt content of fresh water decreases, its resistance increases, which can lead to a decrease in current density. At the same time, it can be found that with the increase of the ...

Embodiment 2

[0038] Example 2 High-concentration ammonium chloride bipolar membrane electrodialysis acid-base regeneration

[0039] Such as figure 2 As shown, the schematic diagram of the principle of bipolar membrane electrodialysis acid-base regeneration adopted in the present invention. The membrane stack structure includes bipolar membrane 1, cation exchange membrane 2, anion exchange membrane 3, separator, liquid storage tank (including polar water tank, brine tank, acid tank, lye tank) 7, electrodes including anode 4, cathode 5 and electric control cabinet (including rectifier power supply), and clamping device, etc. The principle of bipolar membrane electrodialysis acid-base regeneration is that water molecules enter the interface layer of bipolar membrane through diffusion and dissociate into H under the action of polarization potential. + and OH - ions to form an acid chamber and an alkali chamber respectively. At the same time, high-concentration ammonium chloride wastewater ...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/06C01C1/02C01B7/05
CPCY02A20/131C02F9/00C01B7/055C01C1/022C01C1/026C02F1/441C02F1/4693C02F2101/12
Inventor 石绍渊曹宏斌李玉平刘晨明盛宇星
Owner JIANGXI INST OF RARE EARTHS CHINESE ACAD OF SCI
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