Waste water treating device and method based on electrochemical principle

A wastewater treatment and electrochemical technology, applied in the field of environmental engineering, can solve the problems of increasing energy consumption, reducing treatment efficiency, and large electrode consumption, and achieve the effects of preventing electrode passivation, prolonging equipment life, and reducing equipment energy consumption

CN106430454AActive Publication Date: 2017-02-22SINOSTEEL ANSHAN RES INST OF THERMO ENERGY CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
Publication Date
2017-02-22

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Abstract

A waste water treating device and method based on an electrochemical principle comprises a reaction tank, an electrode A, an electrode B, an electrode fixing strip, an electrode supporting column, a stirring paddle and rotating shafts, wherein the reaction tank is cylindrical; flanges and flange covers are arranged at the upper end and the lower end of the reaction tank; each rotating shaft is mounted in the center of the corresponding flange cover through a bearing; the electrode supporting column is fixed on the flange cover of the lower part of the reaction tank; the electrode A and the electrode B are alternately stacked at the upper end of the electrode supporting column; the stirring paddle is placed between the electrode A and the electrode B; the diameters of center holes of the electrode A and the electrode B are greater than the diameter of each rotating shaft; the center hole of the stirring paddle is matched with the outer diameter of the rotating shaft; one side of the electrode fixing strip is fixed on the inner wall of the reaction tank; and the other side of the electrode fixing strip is clamped in grooves in the periphery of the electrode A and the periphery of the electrode B. The distance between pole plates is adjusted adaptively and is not changed, a bidirectional pulse power supply is used, passivation of the electrodes is prevented, the stirring paddle accelerates migration of ions and air bubbles on the pole plates, and matters attached to the pole plates are removed.
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Description

technical field

[0001] The invention relates to the field of environmental engineering, in particular to a wastewater treatment device and method based on electrochemical principles. Background technique

[0002] Due to its versatility, high flexibility, no pollution or less pollution, and easy control, electrochemical technology is gradually applied to various chemical wastewater and water purification in electroplating, chemical, pharmaceutical, printing and dyeing, and papermaking. At present, there are mainly the following electrochemical technologies and equipment: (1) Micro-electrolysis, mainly iron filings and activated carbon form countless primary batteries under acidic conditions, and use micro-electrolysis to remove pollutants in wastewater. This technology has disadvantages such as slow reaction speed, easy blockage of the reactor, and large dosage of iron filings and acid-base; (2) electrocatalytic oxidation, which uses an anode with high potential and catalytic...

Examples

Embodiment 1

[0039] To treat coking wastewater, the coking wastewater used is the effluent from the secondary sedimentation tank after biochemical treatment. The distance between the plates is 8mm, the anode and cathode are made of aluminum electrodes, the input voltage of the pulse power supply is 220V, the input frequency is 50Hz, the duty ratio of the power supply is 60%, the output frequency is 3000Hz, and the output current is 1A / m 2 , processing time 10min. Stand still to separate and remove flocs, and the effluent meets the coking chemical pollutant discharge standard (GB16171-2012). The water quality indicators before and after treatment are shown in Table 1.

[0040] Table 1: Changes in water quality indicators after coking wastewater treatment

[0041]

Embodiment 2

[0043] Treatment of wastewater containing a variety of heavy metals. The distance between the plates is 10mm, the anode and cathode are made of aluminum electrodes, the pulse power input voltage is 220V, the input frequency is 50Hz, the duty ratio of the power supply is 70%, the output frequency is 500Hz, and the output current is 6A / m 2 , processing time 45min. The concentrations of heavy metals in water before and after treatment are shown in Table 2.

[0044] Table 2: Changes in concentration of heavy metal wastewater after treatment

[0045]