Waste water treating device and method based on electrochemical principle

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.

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...

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Problems solved by technology

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 activity to directly oxidize pollutants in wastewater. The technical electrode consumption is large, the electrode is expensive, and the cost is high; (3) electrodialysis is to add a selective permeable membrane in the electric field to separate pollutants. Its disadvantage is that it is easy to produce concentration extremes during operation and cause equipment Scaling reduces treatment efficiency and increases energy consumption; (4) electrocoagulation, under the condition of power on, the metal anode generates cations and forms a flocculant, which flocculates and removes pollutants, and at the same time, oxidation-reduction decomposition pollution and gas Separation of pollutants by flotation

Electrocoagulation is widely used in the field of wastewater treatment because of its simple equipment, but there are also problems of high power consumption and plate passivation, which are limited in application

[0003] With the development of electrode materials, the development of reaction equipment and the improvement of traditional electrochemical processes, the problems of energy consumption and plate passivation of electrocoagulation equipment have been improved. However, as the reaction progresses, the consumption of electrode plates is extremely high. The plate spacing cannot be adjusted automatically and self-adaptively, resulting in a larger and larger plate spacing

The metal oxides (CaO, MgO, etc.) produced by the reaction and the strong adhesive substances wrapping the electrode are not easy to remove, resulting in a decrease in the processing efficiency of the electrochemical equipment and a sudden increase in energy consumption. The electrodes can only be cleaned or replaced, and the equipment maintenance frequency is high.

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