A continuously adjustable electrode spacing desalination technology and reaction module for electroadsorption-regeneration

A technology of electrode spacing and electro-adsorption, which is applied in separation methods, special treatment targets, and separation of dispersed particles, can solve problems such as reaching the adsorption platform quickly, low electrode regeneration rate, and increased economic costs, so as to improve electrode regeneration rate, Effect of reducing secondary adsorption and high desalination rate

Active Publication Date: 2021-07-16
BEIJING FORESTRY UNIVERSITY
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Problems solved by technology

In addition, the desorbed ions in the electrode regeneration stage are secondarily adsorbed to the opposite plate, resulting in a low electrode regeneration rate, which is also a problem that is difficult to solve in the process of electroadsorption-regeneration desalination. Some electroadsorption desalination devices such as Wu Fuping wrote Chinese patent CN107935132A, CN104817143A written by Tang Xinqiang, etc. all use anion and cation exchange membranes to prevent secondary adsorption in the regeneration stage, but increase economic costs and increase water flow resistance to a certain extent
[0004] In general, electro-adsorption desalination has a very broad application prospect, but the traditional electro-adsorption desalination technology is limited by the fixed electrode spacing and voltage, and has problems such as reaching the adsorption platform quickly and low electrode regeneration rate. Optimize and improve on the basis of

Method used

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  • A continuously adjustable electrode spacing desalination technology and reaction module for electroadsorption-regeneration
  • A continuously adjustable electrode spacing desalination technology and reaction module for electroadsorption-regeneration
  • A continuously adjustable electrode spacing desalination technology and reaction module for electroadsorption-regeneration

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Embodiment 1

[0021] Embodiment 1, desalination device

[0022] The desalination reactor includes an electric adsorption desalination device box 1, a raw water tank 2, a clean water tank 3, a final concentrated water tank 4, a power supply 5, a water pump 6, and a conductivity meter 7, 8:

[0023] Wherein, the power supply 5 is connected with the electro-adsorption desalination device box 1 through wires to form a loop. The power supply 5 is an adjustable DC power supply within the voltage range of 0-1.5V. The water pump 6 is a peristaltic pump with an adjustable water inlet flow rate of 0-40mL / min. The conductivity meters 7 and 8 are the same conductivity meters with a measurement range of 0 to 5000 μS / cm. The box body of the electro-adsorption desalination device includes 6 pairs of electrode plates. The electrode plates are flat electrodes with positive and negative electrodes placed opposite each other and form a baffle channel; the materials constituting the electrode plates include ...

Embodiment 2

[0024] Embodiment 2, electric adsorption-regeneration

[0025] Connect the electro-adsorption desalination device box 1 in Example 1 to the power supply 5 through wires and turn on the power supply during the electrification and adsorption stage. The relative conductivity is 3200±100 μS / cm, Cl - The external drainage of landfill leachate with a concentration of 560±20 μS / cm is desalinated, and the adsorption desalination conditions are shown in Table 1.

[0026] Table 1 Electrosorption-regeneration treatment conditions

[0027]

[0028] After completion of desalination, the desalination rate was 42.6%, Cl - The removal rate was 66.7%, Ca 2+ The removal rate is 80.2%, Mg 2+ The removal rate is 73.3%, the desalination rate is 90mg / (L h), and the current density is stable at 2.5-3.0mA / cm during the desalination process 2 . After completion of electrode regeneration, the electrode regeneration rate was 97.3%, and the water production rate was 91.7% after 4 operating cycles...

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Abstract

The invention discloses a continuously adjusting electrode spacing desalination technology and a reaction module for electroadsorption-regeneration. The reactor includes a continuously adjustable electrode spacing type desalination reactor box 1, a raw water tank 2, a clean water tank 3, a final concentrated water tank 4, a power supply 5, a water pump 6, and conductivity meters 7 and 8. Utilizing the present invention to treat saline waste water mainly discharged from landfill leachate, the highest desalination rate can reach 42.6%. ‑ The removal rate was 73.3%, the desalination rate was 90mg / (L·h), the electrode regeneration rate was 97.3%, and the water production rate was 91.7%. The invention adopts the continuous adjustment electrode spacing type continuous electrosorption-regeneration mode controlled by movable slots, and has the advantages of simple operation, stable current density, high desalination rate, high desalination efficiency, high electrode regeneration rate, no scaling phenomenon, and water production rate The characteristics of high temperature and long electrode life have realized the desalination and regeneration of low-salt industrial wastewater, and have broad prospects in the field of environmental protection and saline wastewater treatment.

Description

technical field [0001] The invention belongs to the field of environmental protection saline wastewater treatment, and specifically relates to a technology and a reaction module for electroadsorption-regeneration desalination that can continuously adjust the distance between electrodes, and is mainly applied to low-salt industrial wastewater that cannot meet the regeneration and reuse standards . Background technique [0002] The shortage of fresh water resources has become an imminent global problem, and the recycling of industrial wastewater is a top priority at present. The low-salt industrial wastewater represented by landfill leachate drainage usually has an electrical conductivity of 1000-4000 μS / cm, and cannot meet the standard for reuse because the salt content is difficult to further reduce. A new type of salty wastewater treatment method developed in recent years - electro-adsorption desalination technology, has the advantages of no secondary pollution, low requir...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/469
CPCC02F1/469C02F2201/46C02F2303/14
Inventor 王辉唐晗昱卞兆勇
Owner BEIJING FORESTRY UNIVERSITY
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