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A kind of electrodialysis equipment and method for selective removal of target ions in drinking water

An ion-selective, electrodialysis technology, applied in the field of drinking water safety, can solve the problems of difficult to achieve large-scale household water supply in remote areas, high cost, lack of selectivity in desalination, etc., to improve long-term stability and operational applicability , reduce water treatment costs, good removal effect

Active Publication Date: 2022-07-08
RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of the lack of selectivity and high cost of desalination in current reverse osmosis technology, it is difficult to realize large-scale household water supply in remote areas, the present invention is an electrodialysis device and method for selective removal of target ions in drinking water

Method used

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  • A kind of electrodialysis equipment and method for selective removal of target ions in drinking water
  • A kind of electrodialysis equipment and method for selective removal of target ions in drinking water
  • A kind of electrodialysis equipment and method for selective removal of target ions in drinking water

Examples

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Embodiment 1

[0071] An electrodialysis method for selective hard removal of target ions in drinking water,

[0072] Raw water hardness is 600ppm (calculated as calcium carbonate), TDS is 900ppm, electrodialysis uses electrodialysis membrane, the selective separation coefficient of electrodialysis membrane is 0.8, electrodialysis membrane stack is 1st grade and 1st stage, and electrodialysis membrane pairs are 300 pairs. The membrane is an ion exchange membrane, the flow rate is 6 m / s, the voltage is 45 volts, the water production rate is 90%, the light-concentration ratio is 1.0, =0.9, effluent hardness 300mg / L, TDS 500ppm, direct operating cost is 0.05 yuan / ton, investment is 12,000 / ton hour, cleaning cycle is half a year, and membrane life is 8 years.

Embodiment 2

[0074] An electrodialysis method for selective defluorination of drinking water target ions,

[0075] Raw water fluoride ion 2.0ppm, hardness 150ppm (calculated as calcium carbonate), TDS 600ppm, electrodialysis using electrodialysis membrane, electrodialysis membrane selectivity separation coefficient is 0.3, electrodialysis membrane stack is 2 grades and 2 sections, and electrodialysis membrane pair is 300 Yes, the electrodialysis membranes used in the first stage are compression diffusion boundary layer membranes, a total of 180 pairs, the voltage is 45 volts, and the flow rate is 5 m / s. The electrodialysis membranes used in the second stage are ion-exchange membranes, with a total of 120 pairs. 7.5 m / s; water production rate 97%, light-concentration ratio 1.0, =0.5, effluent fluoride ion 0.8ppm, TDS350ppm, direct operating cost is 0.03 yuan / ton, investment is 12,000 / ton hour, cleaning cycle is 1 year, and membrane life is 8 years.

Embodiment 3

[0077] An electrodialysis method for selective calcium and fluorine removal of target ions in drinking water,

[0078] Raw water fluoride ion 2.0ppm, hardness 600ppm (calculated as calcium carbonate), TDS 950ppm, electrodialysis using electrodialysis membrane, the selectivity separation coefficient of electrodialysis membrane is 0.3, the electrodialysis membrane stack is 2 grades and 2 sections, and the electrodialysis membrane pair is 300 Yes, the electrodialysis membranes used in the first stage are ion exchange membranes, with a total of 150 pairs, a voltage of 65 volts, and a flow rate of 5 m / s. / sec; water production rate 93%, light-concentration ratio 1.0, =0.5, effluent fluoride ion 0.8ppm, hardness 200ppm (calculated as calcium carbonate) TDS350ppm, direct operating cost 0.03 yuan / ton, investment 16,000 / ton hour, cleaning cycle 1 year, membrane life 8 years.

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Abstract

The invention discloses an electrodialysis device and a method for selectively removing target ions from drinking water, belonging to the technical field of drinking water safety, and in particular to an electrodialysis method and device for selectively removing target ions by "aggregation-controlled compression-diffusion boundary layer" It is clearly proposed that the raw water concentration of brackish water treated by electrodialysis is low (the total dissolved solid TDS is less than 3000ppm), and the ion electromigration control resistance is changed from pure membrane resistance to diffusion boundary layer resistance. and electrodialysis process parameters, fully compress the diffusion boundary layer, improve the relative electromobility rate of target ions, and at the same time, comprehensive electrodialysis selectively removes the initial concentration effect, competitive effect, synergistic effect of target ions, concentration diffusion, differential pressure osmosis, etc. It realizes the guided removal of low-cost target ions, greatly reduces the cost of water treatment, and improves the long-term stability and operational applicability of the equipment.

Description

technical field [0001] The invention belongs to the technical field of drinking water safety, in particular to an electrodialysis device and method for selective removal of target ions from drinking water. Background technique [0002] In remote or too scattered areas, there is no drinking water source that meets the standard, and large-scale centralized water supply cannot be achieved due to remote or too scattered areas. The drinking water problem in remote areas has become the top priority of future water treatment technology research. The United Nations' World Water Development Report 2019 states: "The world's wealthy groups generally have access to higher levels of water services at lower prices, while poorer people often have to pay for services of equal or even inferior quality. extremely high cost." Substandard water sources, long water intake distances, lack of public facilities and professional service personnel, people in low-development areas of the world usual...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/469
CPCC02F1/4693C02F1/4695Y02A20/131
Inventor 杨敏田秉晖罗胜朱铭
Owner RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI