A bioelectrochemical reactor and its application in degrading fluoronitrobenzene wastewater

Abstract

The invention discloses a bio-electrochemical reactor and an application thereof in degrading fluoronitrobenzene wastewater. The bio-electrochemical reactor comprises a bed body, wherein an electrode is arranged in the bed body, the electrode is a spiral coil type electrode which is water-permeable in a radial direction, and a water distributor which is positioned on the periphery of the spiral coil type electrode and a water outlet device which is positioned at a central position of the spiral coil type electrode are also arranged in the bed body. According to the bio-electrochemical reactor disclosed by the invention, the spiral coil type electrode is formed by winding a cathode electrode and an anode electrode which are insulated from each other, and a cathode and an anode can be used for treating pollutants synchronously so as to ensure that the treatment efficiency can be improved, operation steps can also be simplified, and the treatment cost can be reduced. Meanwhile, the water distributor is arranged on the periphery of the spiral coil type electrode, the water outlet device is arranged at the central position of the spiral coil type electrode, wastewater can be permeated to the center from the periphery of the spiral coil type electrode, and a plurality of cathode-anode groups which can be used for treating the wastewater for a plurality of times are formed in the spiral coil type electrode, so that the wastewater treatment efficiency can be greatly improved; and aiming at the fluoronitrobenzene wastewater treated by using the bio-electrochemical reactor disclosed by the invention, the fluoronitrobenzene pollutant removal rate, defluorination rate and mineralization rate can basically reach more than 90% respectively.

Description

technical field [0001] The invention belongs to the technical field of wastewater treatment, in particular to a bioelectrochemical reactor and its application in degrading fluoronitrobenzene wastewater. Background technique [0002] Organic fluorine products are widely used in military industry, electronics, textiles, light industry, medicine and agriculture. pollutants. At present, the domestic methods for treating fluoride salt wastewater mainly include precipitation method, coagulation method and adsorption method, but these methods only remove fluoride salt in fluorine-containing wastewater, and the treatment effect of organic fluorine pollutants is not good. [0003] Fluorinated nitrobenzene compounds are typical refractory toxic organic fluorine pollutants. Because the nitro and fluorine atoms in this pollutant are both electron-withdrawing groups, the electron cloud density on the benzene ring is greatly reduced, and the oxidase is degraded. Electrophilic attack is ...

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Problems solved by technology

[0006] The disadvantages of this bioelectrochemical reactor are: ① The cathode microorganisms used are mesophilic microorganisms, and mesophilic microorganisms are easy to wrinkle or even die under the action of an electric field. The amount and protein content decreased significantly, which greatly limited the practical application of engineering; ②It is a double-chamber reactor with large internal resistance and high energy consumption, and many double-chamber reactors need to use ion exchange membranes , the operating cost is high, and the mass transfer efficiency is not high

[0008] Although the bioelectrochemical reactor is a single-chamber reactor, the area of ​​the cathode and the anode is small, the interval between the two is relatively large, and the electrochemical reaction between the cathode and the anode is poorly connected; and the anode is in the Downstream of the cathode, only one continuous treatment of wastewater is performed, and the degradation efficiency is not high

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