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Push-flow electrochemical water softening method and push-flow electrochemical water softening device

An electrochemical and water softening technology, applied in chemical instruments and methods, descaling and water softening, water/sewage treatment, etc., can solve the problems of fully mixed reactor backmixing, axial dispersion, multiple dead water areas, etc., to achieve Effects of improved softening efficiency, increased volumetric efficiency, and shortened gap between electrodes

Inactive Publication Date: 2018-05-29
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The fully mixed reactor has a simple structure and is currently the most widely used at home and abroad. However, the fully mixed reactor not only has serious reverse mixing, short flow and axial dispersion, but also has many dead water areas, which seriously reduces the reactor capacity. The volumetric efficiency, which in turn affects the softening effect

Method used

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  • Push-flow electrochemical water softening method and push-flow electrochemical water softening device
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  • Push-flow electrochemical water softening method and push-flow electrochemical water softening device

Examples

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Effect test

Embodiment 1

[0040] Industrial circulating water with a hardness of about 350 mg / L and a scale inhibitor concentration of about 2 mg / L is used figure 1 The plug-flow electrochemical water softening device is shown for treatment. The size of the cathode and anode electrodes is 10×10×2 cm, the distance between the electrodes is 10 mm, and the reactor volume is 1400 mL. The operating conditions are as follows: the current density in the softening stage is 40 A / m 2 The average voltage in the softening stage is 4.8V; the water flow rate in the softening stage is 40 L / h; the treatment time in the softening stage is 12 hours; the air velocity in the descaling stage is 45 L / min; The operation results are as follows: the average removal rate of total hardness ions in the effluent in the softening stage is 19.3%, and the deposition rate is 30.6 g / h / m 2 , CaCO energy consumption 5.7 kWh / kg 3 .

Embodiment 2

[0042] Industrial circulating water with a hardness of about 350 mg / L and a scale inhibitor concentration of about 2 mg / L is used figure 1The plug-flow electrochemical water softening device is shown for treatment. The size of the cathode and anode electrodes is 10×10×2 cm, the distance between the electrodes is 20 mm, and the reactor volume is 1400 mL. The operating conditions are as follows: the current density in the softening stage is 10 A / m 2 ; The average voltage in the softening stage was 6.5V, and the water flow rate in the softening stage was 80 L / h; the treatment in the softening stage lasted 9 hours; the air velocity in the descaling stage was 25 L / min; The running results are as follows: the average removal rate of total hardness ions in the softening stage is 13.5%, and the deposition rate is 14.4 g / h / m 2 , CaCO energy consumption 11.2 kWh / kg 3 .

Embodiment 3

[0044] Industrial circulating water with a hardness of about 350 mg / L and a scale inhibitor concentration of about 2 mg / L is used figure 1 The plug-flow electrochemical water softening device is shown for treatment. The size of the positive and negative electrodes is 10×10×2 cm, the distance between the electrodes is 2 mm, and the reactor volume is 1400 mL. The operating conditions are as follows: the current density in the softening stage is 300 A / m 2 ; The average voltage in the softening stage is 12.2V; the water flow rate in the softening stage is 60 L / h; the treatment time in the softening stage is 6 h; the air velocity in the descaling stage is 60 L / min; The operation results are as follows: the average removal rate of total hardness ions in the effluent in the softening stage is 16.1%, and the deposition rate is 105.74 g / h / m 2 , CaCO energy consumption 56.2 kWh / kg 3 .

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Abstract

The invention discloses a push-flow electrochemical water softening method and a push-flow electrochemical water softening device. Anode electrodes and cathode electrodes are sequentially and vertically installed in an electrochemical reactor in an alternate way; a plurality of electrode chambers are formed by the anode electrodes and the cathode electrodes which are arranged up and down in a staggered way; a water through channel is reserved in the bottom of each anode electrode or each cathode electrode and is communicated with the bottom of the electrode chamber adjacent to the water through channel; another water through channel is reserved in the top of each anode electrode or each cathode electrode and is communicated with the top of the electrode chamber adjacent to the water through channel; the bottom water through channels and the top water through channels are arranged in an alternate way. The method comprises two alternate operation steps: water softening stage: enabling hard water to pass through the electrochemical reactor, promoting water electrolysis by using direct current, respectively generating CaCO3 and Mg(OH)2 and depositing same on the surfaces of the cathodeelectrodes so as to remove hard ions in the water; cathode electrode descaling stage: introducing air into the electrochemical reactor, descaling the cathode electrodes by using the shear force generated by bubble breakage, and discharging the removed precipitate from a sludge outlet. The method and the device are suitable for softening industrial circulating water of industries such as electricpower, petroleum as well as heating and ventilation.

Description

technical field [0001] The invention relates to an electrochemical water softening method and device, in particular to a push-flow electrochemical water softening method and device. Background technique [0002] The treatment of circulating cold produced in the process of evaporative cooling in the electric power, petrochemical, and steel manufacturing industries all involves softening. At present, the traditional methods of softening at home and abroad include chemical agent dosing method, reverse osmosis method and ion exchange method. These methods have their own characteristics. Compared with the traditional method, the electrochemical softening method has the advantages of environmental friendliness, mild reaction conditions, high treatment efficiency and wide application range, so it has a good industrial application prospect in the treatment of high hardness wastewater. [0003] In recent years, electrochemical water softening technology has been applied in the fiel...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F5/00C02F1/461
CPCC02F1/4602C02F1/46104C02F2001/46119C02F2001/46133C02F2001/46152
Inventor 陈雪明於洋金华长
Owner ZHEJIANG UNIV
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