Synchronous electrocatalytic oxidation-reduction degradation reactor and method for treating membrane filtration concentrated solution

Abstract

The invention discloses a synchronous electrocatalytic oxidation-reduction degradation reactor and a method for treating a membrane filtration concentrated solution. The reactor comprises at least one anode chamber and at least one cathode chamber, the anode chamber and the cathode chamber are alternately arranged, a porous partition plate is arranged between the anode chamber and the cathode chamber, an anode is arranged in the anode chamber, and a cathode is arranged in the cathode chamber. The reactor is used for treating a membrane filtration concentrated solution. The synchronous electrocatalytic oxidation-reduction degradation reactor has the advantages of simple structure, convenience in use, wide application range and the like, can be widely used for treating toxic and harmful wastewater with complex components, can achieve a good treatment effect, and has very high use value and very good application prospects. According to the method for treating the membrane filtration concentrated solution, chroma, COD, ammonia nitrogen, total nitrogen, chloride and heavy metal in the membrane filtration concentrated solution can be removed at the same time, effective treatment of the membrane filtration concentrated solution can be achieved, the membrane filtration concentrated solution can reach the emission standard, and the method has the advantages of being simple in process, convenient to operate, low in cost, high in treatment efficiency, good in treatment effect and the like.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment, and relates to a synchronous electrocatalytic oxidation-reduction degradation reactor and a method for treating concentrated liquid of membrane filtration. Background technique [0002] Difficulties in the treatment of membrane filtration concentrates are high salt content, large chroma, and poor biodegradability. The existing recharge technology will lead to the continuous accumulation of macromolecular organic matter and inorganic salts in the concentrated solution, which will deteriorate the water quality. This method has been gradually eliminated; the membrane distillation and evaporation concentration methods based on further reduction also have low heat energy utilization efficiency and are easy to Cause problems such as equipment corrosion. Conventional removal methods for refractory organics in membrane filtration concentrates are mainly activated carbon adsorption, membrane sep...

AI Technical Summary

Problems solved by technology

The electrocatalytic degradation process can be divided into two types: electrocatalytic oxidation and electrocatalytic reduction, but both processes have certain defects: the electrocatalytic oxidation process is not conducive to the removal of nitrate nitrogen and total nitrogen in sewage, and the electrocatalytic reduction process is not conducive to the removal of nitrate nitrogen and total nitrogen in sewage. Degradation of COD and removal of chroma and heavy metals in sewage

In addition, the existing electrocatalytic degradation process still has the following problems: the electrolytic anode catalytic oxidation and cathode nitrate reduction denitrification are not combined, and the denitrification ability of the electrolytic system is not taken into account while focusing on the anode's COD degradation of wastewater. Due to the lack of investigation on the performance of electrolytic cathode materials, the total nitrogen (especially nitrate nitrogen) in sewage cannot be effectively reduced, and the deep degradation of pollutants cannot be completed. Therefore, these methods have not fully utilized the reduction and degradation ability of the cathode, and the reaction system The denitrification efficiency is low, and the heavy metals in the sewage cannot be effectively removed, and the salt content of the sewage can be reduced. The effluent needs to be further denitrified by MBR or membrane filtration. means of treatment or exist as a link in the process chain

In addition, the following problems also exist in the processing method of the existing membrane filtration concentrate: (1) the two pole chambers of the existing electrodialyzer and electrolyzer bipolar chamber electrochemical liquid treatment device are separated by an ion exchange membrane, and the Liquid (sewage) is supplied between the exchange membrane and the anion exchange membrane

However, the hypochlorous acid produced by the electrolytic treatment of high-chlorine wastewater has strong oxidizing properties, which can easily lead to poor activity or even failure of the bacteria.

(3) The main concern of the integrated reactor is the degradation efficiency of refractory organic matter, the reduction and denitrification efficiency of the system is limited, and the effluent needs to be co-treated by other processes because it cannot meet the standard

(4) Some electrocatalysis processes also use UV / H 2 o 2 / O 3 and other oxidation capabilities, and co-treatment of sewage, these methods also cannot solve the problem of total nitrogen in high-nitrogen sewage that does not meet the standard, and due to the introduction of reagents, the operating cost is increased

Images