Electrochemical water softening method and system using air scouring descaling

An air scouring, electrochemical technology, applied in chemical instruments and methods, water softening, water/sewage multi-stage treatment, etc. The effect of decreasing and increasing the effective area

Inactive Publication Date: 2017-10-13
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The obvious defects of the above descaling methods have seriously restricted the popularization and application of electrochemical softening methods.

Method used

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  • Electrochemical water softening method and system using air scouring descaling
  • Electrochemical water softening method and system using air scouring descaling
  • Electrochemical water softening method and system using air scouring descaling

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Embodiment

[0039] Industrial circulating water with a hardness of about 350mg / L is treated by the system of the present invention. The system uses a DSA plate anode and a mirror stainless steel plate cathode. The size of the electrodes is 21x7x2 cm, the net distance between the two electrodes is 5mm, and the reactor volume is 100mL. The operating conditions are as follows: current density 100A / m 2 ; Average voltage 7V; softening stage treatment water flow rate 10L / h; softening stage treatment lasted 12h; descaling stage water flow rate 10L / h; descaling stage air velocity 45L / min; descaling stage time 5min. The running results are as follows: the average removal rate of total hardness ions in the treated effluent is 13.7%, and the deposition rate is 12g / h / m 2 , energy consumption 20 kWh / kg CaCO 3 .

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Abstract

The invention discloses an electrochemical water softening method and system using air scouring descaling. The system is formed by series connection of an electrochemical reactor and a sedimentation tank. The following two steps are adopted for alternate operation: a water softening stage: hard water passes through the electrochemical reactor, direct current power is utilized to promote water electrolysis to generate CaCO3 and Mg(OH)2 depositing on a cathode surface respectively, thus removing hardness ions from water; a cathode descaling stage: water and compressed air are introduced into the electrochemical reactor simultaneously, the shear force generated by bubble breakage is utilized for descaling treatment on the cathode; and at the same time of descaling, continuous flowing water current in the electrochemical reactor is employed to discharge the removed precipitate out of the electrochemical reactor. The effluent water from the electrochemical reactor passes through the sedimentation tank, water and suspended solid are separated in the sedimentation tank, and then the effluent water is discharged through a sedimentation tank water outlet valve. The method and system provided by the invention are applicable to softening of industrial circulating water in electric power, heating ventilation and other industries and purification of electroplating rinsing and other heavy metal ion-containing wastewater.

Description

technical field [0001] The invention relates to an electrochemical water softening method and system, in particular to an electrochemical water softening method and system for air flushing and descaling. 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 so on. These methods have their own characteristics. Compared with the traditional method, the electrochemical softening method has the advantages of environmental friendliness, high treatment efficiency and wide application range, so it has a good industrial application prospect in the treatment of high hardness wastewater. [0003] Although the electrochemical softening method has many advantages mentioned above, there are still some de...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/06
CPCC02F1/52C02F5/02
Inventor 陈雪明於洋金华长
Owner ZHEJIANG UNIV
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