Chemical method-electrodialysis-reverse osmosis integrated concentrated seawater softening and concentrating process

A technology of electrodialysis and chemical method, which is applied in water softening, chemical instruments and methods, seawater treatment, etc., can solve the problems of small footprint, high pressure requirements, high water quality requirements, etc., and achieve high recovery rate, The effect of avoiding environmental pollution and high practical value

Inactive Publication Date: 2019-04-19
EAST CHINA UNIV OF SCI & TECH
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Problems solved by technology

[0007] Reverse osmosis has no phase change, small footprint, and low cost, but it has high requirements for influent water quality, concentration is limited by the osmotic pressure of the solution, and the pressure requirements are harsh

Method used

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  • Chemical method-electrodialysis-reverse osmosis integrated concentrated seawater softening and concentrating process
  • Chemical method-electrodialysis-reverse osmosis integrated concentrated seawater softening and concentrating process
  • Chemical method-electrodialysis-reverse osmosis integrated concentrated seawater softening and concentrating process

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Embodiment Construction

[0034] The present invention will be described in further detail below in conjunction with the accompanying drawings, the purpose of which is only to better understand the content of the present invention.

[0035] Such as figure 1 As shown in the flow chart, this process consists of four parts: chemical decalcification, monovalent selective ion exchange membrane electrodialysis system, reverse osmosis system, and pure concentration membrane electrodialysis concentration system.

[0036] The chemical method decalcification, by passing K into the concentrated seawater 2 CO 3 、Na 2 CO 3 , (NH 4 ) 2 CO 3 One or several combinations of them are used as a precipitating agent. After the reaction, the filter cake is filtered and washed several times, and dried to obtain CaCO 3 by-product.

[0037] The schematic diagram of the monovalent selective ion exchange membrane electrodialysis device is as follows figure 2 As shown, the electrodialysis device consists of five parts: ...

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Abstract

The invention belongs to the field of seawater desalination and concentrated seawater resource utilization, and relates to a chemical method-electrodialysis-reverse osmosis integrated concentrated seawater softening and concentrating process. According to the chemical method-electrodialysis-reverse osmosis integrated concentrated seawater softening and concentrating process, technical indexes canbe achieved on the basis of three membrane cell systems comprising chemical precipitation method for calcium removing and reverse osmosis, monovalent selective ion exchange membrane electrodialysis and pure concentrated membrane electrodialysis, concentrated brine is further in butt joint with a concentrating process to provide a liquid salt raw material for chlor-alkali, soda ash and other industries, TDS is required to be not lower than 200,000 mg/L; fresh water accords with the standard that the TDS is less than 500 mg/L in hygienic standard of drinking water, and all produced water needs to meet the requirement for directly discharging into sea or recycling in the process, the problem of environmental pollution and marine ecological imbalance caused by direct drainage of concentrated seawater can be relieved, and comprehensive utilization of seawater resources and enriched chemical resources is realized, so that the seawater desalination cost is reduced and reduced.

Description

technical field [0001] The invention belongs to the field of seawater desalination and resource utilization of concentrated seawater, and relates to a chemical method-membrane integrated concentrated seawater softening and concentration process, in particular to a chemical method-electrodialysis-reverse osmosis integrated concentrated seawater softening and concentration process The technology can realize the deep concentration of concentrated seawater, realize the effective use of water resources and chemical resources rich in seawater, and improve economic and environmental benefits. Background technique [0002] my country is short of water resources, the per capita amount of fresh water is small, and the spatial and temporal distribution is uneven. The more developed the economy and the denser the population, the cities are often the cities that lack fresh water. By 2014, the global cumulative desalination and desalination capacity reached 80.9 billion m 3 / d, 59% of whi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/06C02F103/08
CPCC02F1/42C02F1/441C02F1/4693C02F5/02C02F9/00C02F2103/08C02F2209/08C02F2209/10C02F2209/11C02F2301/08Y02A20/131
Inventor 孙玉柱于建国陈静张杰
Owner EAST CHINA UNIV OF SCI & TECH
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