Novel bipolar membrane electrodialysis device for carbon capture and high-salinity wastewater synergistic system and process

Abstract

The invention provides a novel bipolar membrane electrodialysis device for a carbon capture and high-salinity wastewater synergistic system and process, the novel bipolar membrane electrodialysis device is used for receiving high-salinity wastewater to prepare acid liquor and alkali liquor for carbon capture treatment of flue gas to be treated, and the novel bipolar membrane electrodialysis device comprises a membrane stack arranged between an anode plate and a cathode plate; the membrane stack sequentially comprises a cation homogeneous membrane, a bipolar membrane, an anion exchange membrane, a monovalent selective cation exchange membrane, a bipolar membrane and a cation homogeneous membrane from the anode plate to the cathode plate; or the membrane stack sequentially comprises a cation homogeneous membrane, a bipolar membrane, a monovalent selective cation exchange membrane, a bipolar membrane and a monovalent selective cation exchange membrane from the anode plate to the cathode plate. The membrane stack provided by the invention has higher tolerance to inlet water hardness, the investment and operation cost of advanced softening can be reduced, the inlet water hardness index requirement is completely superior to that of the prior art, and the provided collaborative system and process have very good cost advantage and application prospect.

Description

technical field [0001] The invention relates to the technical field of flue gas decarbonization and wastewater treatment, in particular to a novel bipolar membrane electrodialysis device used for a carbon capture and high-salt wastewater synergistic system and process. Background technique [0002] Carbon dioxide is one of the main culprits of the global greenhouse effect. Effective control of carbon dioxide emission sources is imminent. In 2020, my country's carbon emissions will reach 9.899 billion tons, a year-on-year increase of 0.6%, a new record high, and the proportion of global carbon emissions will also increase to 30.7%. At the same time, among the major countries (regions) in the world, only China’s carbon emissions have maintained a positive increase, and all other countries (regions) have experienced declines. As the world's largest carbon emitter, China needs to make more efforts to control carbon dioxide emissions. Among the carbon dioxide industrial emissi...

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Problems solved by technology

While innovating the application process of this invention, it also faces similar problems: (1) The feed water of the bipolar membrane electrodialysis device is not resistant to hardness, and the application uses a nanofiltration and salt separation process to remove hardness ions; (2) Recycling The recycling effect is not good, the calcium carbonate precipitate formed by carbon capture is discharged out, there are impurities in it, and the subsequent recovery treatment is not carried out, the acid liquid produced is not used, and the newly generated brine is designed to be returned to the inlet of the seawater desalination process, but the unit Water contains more hardness ions, potentially affecting the stable operation of upstream processes

[0006] At present, bipolar membrane electrodialysis has certain technical defects in the application of carbon capture technology, the degree of resource recycling is still insufficient, and the process of the overall system is not green and low-carbon enough, so it is necessary to optimize the technology and improve the process, so that Make the engineering application of the process direction have practical feasibility and better market promotion value

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