Circulating carbon dioxide regeneration ion exchange system and process for simultaneously realizing water body purification and carbon emission reduction

Abstract

The invention belongs to the technical field of water treatment, and particularly relates to a circulating carbon dioxide regeneration ion exchange system and process for simultaneously realizing water purification and carbon emission reduction. In a system internal circulation mode, an efficient regeneration technology that a plug flow reactor (PFA) is converted into a continuous stirred reactor (CSTR) system and anion and cation exchangers pass through carbon dioxide gas (including but not limited to high-purity carbon dioxide, industrial waste gas and combustion waste gas in industrial production and carbon dioxide, dry ice, liquid carbon dioxide and the like supplemented and collected in the atmosphere) is realized. According to the method, simultaneous regeneration of the anion and cation exchangers by the low-pressure carbon dioxide gas is successfully realized, the regeneration time is reduced to 90 minutes from 15 hours of a fixed bed system (PFA), the regeneration efficiency is improved by more than three times compared with that of the fixed bed system, and the regeneration pressure is reduced by 30%. The process makes water desalination possible by using industrially discharged low-purity (30-50%) carbon dioxide waste gas, and meanwhile, 40% carbon emission reduction is achieved.

Description

technical field [0001] The invention belongs to the technical field of water treatment, and in particular relates to a circulating carbon dioxide regeneration ion exchange system and a process for simultaneously realizing water body purification and carbon emission reduction. Background technique [0002] Due to the increasingly severe form of global water resource shortage and the increasingly stringent requirements of global warming on carbon emissions, more and more research teams have begun to devote themselves to the research of water quality improvement, sewage reuse and carbon emission reduction. [0003] Among them, some researchers proposed to add ammonia water to seawater and absorb carbon dioxide waste gas to produce two products, ammonium chloride and sodium carbonate, and simultaneously realize seawater or brackish water desalination. However, the cost of this process is high, and ammonia water needs to be added during the treatment process, which increases the ...

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Problems solved by technology

[0005] In order to solve the problems of high cost, high energy consumption, low efficiency, low operating time, low water production rate, and long regeneration time in the above-mentioned prior art, the present invention proposes new ideas for water quality improvement, sewage reuse, and carbon emission reduction. Provide a new carbon dioxide-driven water desalination process

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