Method for flow-electrode capacitive deionization (FCDI)-based desalination and application

A technology of capacitive deionization and flow electrodes, which is applied in separation methods, chemical instruments and methods, and separation of dispersed particles, can solve the problems of lack of optimization of process parameters, etc., and achieve the effects of simple structure of the reaction device, saving of preparation costs, and simple operation

Inactive Publication Date: 2016-10-26
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the research on the FCDI process is still in its infancy. There is no domestic research report on FCDI desalination. The foreign reports also f

Method used

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  • Method for flow-electrode capacitive deionization (FCDI)-based desalination and application
  • Method for flow-electrode capacitive deionization (FCDI)-based desalination and application
  • Method for flow-electrode capacitive deionization (FCDI)-based desalination and application

Examples

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Effect test

Embodiment 1

[0055] The above-mentioned FCDI system was used to treat saline wastewater with an initial NaCl concentration of 500mg / L.

[0056] The operating conditions are: the flow rate of the mobile electrode is 100ml / min, the flow rate of the water inlet is 15ml / min, the operating voltage is 2.0V, the distance between the electrode plates is 2mm, and the initial concentration is 500mg / L.

[0057] Follow the steps below:

[0058] (1) Use deionized water (conductivity less than 5 μs / cm) to prepare a salt solution with a NaCl concentration of 500 mg / L, that is, simulated raw water.

[0059] (2) Using the method of circulating water in and out, use a constant current peristaltic pump to pump out 500mg / L NaCl raw water at a certain flow rate, pump it in from the bottom of the FCDI module unit, flow out through the top, and finally flow back into the beaker, using direct current The regulated power supply applies a certain power supply voltage to both ends of the FCDI module unit, and charg...

Embodiment 2

[0066] The above-mentioned FCDI system was used to treat saline wastewater with an initial NaCl concentration of 1000mg / L.

[0067] The operating conditions are: the flow rate of the mobile electrode is 100ml / min, the flow rate of the water inlet is 15ml / min, the operating voltage is 2.0V, the distance between the electrode plates is 2mm, and the initial concentration is 1000mg / L.

[0068] Follow the steps below:

[0069] (1) Use deionized water (conductivity less than 5 μs / cm) to prepare a salt solution with a NaCl concentration of 1000 mg / L, that is, simulated raw water.

[0070] (2) Using the method of circulating water in and out, use a constant current peristaltic pump to pump out 1000mg / L NaCl raw water at a certain flow rate, pump it in from the bottom of the FCDI module unit, flow out through the top, and finally flow back into the beaker, using direct current The regulated power supply applies a certain power supply voltage to both ends of the FCDI module unit, and cha...

Embodiment 3

[0077] The above-mentioned FCDI system was used to treat saline wastewater with an initial NaCl concentration of 2000mg / L.

[0078] The operating conditions are: the flow rate of the mobile electrode is 100ml / min, the flow rate of the water inlet is 15ml / min, the operating voltage is 2.0V, the distance between the electrode plates is 2mm, and the initial concentration is 2000mg / L.

[0079] Follow the steps below:

[0080] (1) Use deionized water (conductivity less than 5 μs / cm) to prepare a salt solution with a NaCl concentration of 2000 mg / L, that is, simulated raw water.

[0081] (2) Using the method of circulating water in and out, use a constant current peristaltic pump to pump out 2000mg / L NaCl raw water at a certain flow rate, pump it in from the bottom of the FCDI module unit, flow out through the top, and finally flow back into the beaker, using direct current The regulated power supply applies a certain power supply voltage to both ends of the FCDI module unit, and c...

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Abstract

The invention discloses a method for flow-electrode capacitive deionization (FCDI)-based desalination and application. According to the method, a direct current voltage stabilization power supply, a flow electrode, a dual-channel peristaltic pump, an FCDI module unit, a small-size peristaltic pump, a conductivity meter, an organic glass fixing device, a stainless steel interface and an electrode connection splice are involved; one end of each of two pump pipes of the dual-channel peristaltic pump is arranged in each of anode chamber flow electrode liquid and cathode chamber flow electrode liquid, and the other end of the pump pipe is connected with the stainless steel interface in the lower part of the organic glass fixing device; the flow electrode enters the FCDI unit module through the stainless steel interface through pressure provided by the dual-channel peristaltic pump; incoming water is pumped into the FDCI unit module with a prepared sodium chloride solution with different concentration at certain flow speed through the small-size peristaltic pump; the conductivity meter is used for measuring the conductivity concentration of discharged water. A reaction device used in the method is simple in structure, low in operation cost and easy to operate, and no chemicals is fed; automatic control and on-line monitoring are easy to implement; the method is low in energy consumption, and the preparation cost of the electrode is lowered; the method can be applied to the technical field of environmental engineering and water treatment.

Description

technical field [0001] The invention relates to a desalination method and application based on flowing electrode capacitive deionization (FCDI) in the technical field of environmental engineering and water treatment. Background technique [0002] China is a country suffering from drought and water shortage. Among the more than 600 cities in the country, more than 400 cities have insufficient fresh water data. Among them, 110 cities have serious water shortages, and the total water shortage in cities across the country is 6 billion cubic meters. . And about 98% of the world's water is brackish water, sea water and other salt water resources that do not need to be directly drunk. If a desalination technology with low energy consumption can effectively remove the salt without any secondary pollution can be developed, it will provide a substantial solution to the global water crisis. [0003] Currently, widely used desalination technologies include reverse osmosis, electrodial...

Claims

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Application Information

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IPC IPC(8): C02F1/469
CPCC02F1/4691
Inventor 赵研胡筱敏王军韩宏光曹天鸽
Owner NORTHEASTERN UNIV
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