Method and device for combined electrochemical cathode and anode treatment of wastewater

Abstract

The invention discloses a method and device for combined electrochemical cathode and anode treatment of waste water. The electrochemical treatment device comprises: an electrolytic cell; a diaphragm arranged in the electrolytic cell to divide the electrolytic cell into an anode chamber and a cathode chamber which are independent of each other. Wherein the anode chamber and the cathode chamber are respectively used to treat oxidizable and reducible organic waste water; the diaphragm is a polypropylene membrane, the pores of which allow inorganic ions to pass through but not allow organic molecules to pass through; at least one anode and at least one cathode, the at least one anode disposed in the anode compartment, and the at least one cathode is disposed in the cathode compartment. When the electrochemical treatment device of the present invention is used to treat waste water, the positive and negative electrodes function simultaneously, so that the treatment efficiency is greatly enhanced compared with that of a single electrode.

Description

technical field [0001] The invention relates to an electrochemical cathode and anode combined treatment method and device for chemical industrial wastewater, in particular to a pretreatment device and method for TDI wastewater. Background technique [0002] TDI (toluene diisocyanate) is one of the main raw materials of polyurethane plastics. It is widely used in the production fields of soft foam, elastomer, synthetic leather slurry, adhesive, coating, fiber and leather fabric finishing agent. For high value-added products. Two kinds of waste water are mainly produced in the TDI production process, one is the waste water produced by the nitrification process, which is nitrified water, the content of nitrobenzene is 150-250 mg / L, and the COD is 3500-5000 mg / L; the other is the hydrogenation reduction process The main components of the hydrogenated water produced in the process are 2,4-diaminotoluene and 2,6-diaminotoluene, the total mass concentration is about 200-400mg / L, a...

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Problems solved by technology

As we all know, the incineration method requires large investment and high operating costs, and it will cause flue gas pollution and pollutant transfer during incineration.

Although the biological treatment method can make the pollutants finally inorganic and mineralized, and has high economy and treatment efficiency, it is preferred by people, but it is difficult to treat industrial wastewater containing more refractory organic matter or biological toxicity.

Chemical oxidation method needs to add oxidant, which is easy to cause secondary pollution and is not conducive to subsequent biochemical treatment

"Treatment method of waste water containing nitrobenzene and aniline pollutants" CN200610012900 discloses a treatment method of TDI waste water, which uses an iron-based-double oxidation catalytic oxidation method to treat TDI waste water, and this method has a good treatment effect. However, after long-term operation, it is easy to harden and passivate, which reduces the treatment effect of wastewater. The filler needs to replenish the iron consumed by the reaction in time, which further increases labor costs.

In addition, more iron sludge will be produced during the reaction, and iron sludge is a hazardous waste, resulting in higher processing costs

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