A bioelectrochemical reactor and its application in degrading fluoronitrobenzene wastewater

A bioelectrochemical and reactor technology, which is applied in chemical instruments and methods, electrochemical biocombination treatment, water pollutants, etc. The effect of improving processing efficiency, reducing processing cost, and simple operation steps

Active Publication Date: 2016-06-29
ZHEJIANG GONGSHANG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

Method used

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  • A bioelectrochemical reactor and its application in degrading fluoronitrobenzene wastewater
  • A bioelectrochemical reactor and its application in degrading fluoronitrobenzene wastewater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] like figure 1 As shown in the figure, a bioelectrochemical reactor in this embodiment includes a bed body 1 and a cover body (omitted from the figure), the bed body 1 and the cover body are both made of thermal insulation materials, and the bed body 1 is provided with spiral wound electrodes 2.

[0052] In this embodiment, the spirally wound electrode 2 is composed of four layers from the outside to the inside, which are an isolation layer 21 , a cathode layer 22 , an isolation layer 21 , and an anode layer 23 in sequence. A DC stabilizer is connected between the anode layer 23 and the cathode layer 22 . Voltage source 3.

[0053] Among them, the cathode layer 22 is made of hydroxyl-modified carbon felt and has a foldable structure; the anode layer 23 is made of carboxyl-modified carbon felt; the isolation layer 21 is a rigid mesh structure and is made of insulating polytetrafluoroethylene. material.

[0054] Depend on figure 1 It can be seen that the bed body 1 is ...

Embodiment 2

[0068] The bioelectrochemical reactor in Example 1 is used to treat fluoronitrobenzene wastewater. In this embodiment, the volume of the bioelectrochemical reactor is 1000mL, and the liquid filling volume is 800mL; the selected fluoronitrobenzene Such substances are p-fluoronitrobenzene.

[0069] The process includes the following steps:

[0070] (1) Turn on the constant temperature magnetic stirrer, keep the temperature in the bed at 55°C, and keep the stirring intensity at 12kW / m 3 ;Turn on the DC stabilized power supply, apply a voltage of 2V to the spiral wound electrode, inoculate the bed with high-temperature domestication sludge according to the inoculation amount of 4g / L, and hang the film for 7 days;

[0071] (2) After the film hanging is completed, the electrolyte solution containing p-fluoronitrobenzene (initial concentration is 60 mg / L) is sent into the bed, and the cathode layer and the anode layer in the spiral-wound electrode alternately degrade the wastewater;...

Embodiment 3

[0077]The bioelectrochemical reactor in Example 1 is used to treat fluoronitrobenzene wastewater. In this embodiment, the volume of the bioelectrochemical reactor is 1000mL, and the liquid filling volume is 800mL; the selected fluoronitrobenzene Such substances are p-fluoronitrobenzene.

[0078] The process includes the following steps:

[0079] (1) Turn on the constant temperature magnetic stirrer, keep the temperature in the bed at 55°C, and keep the stirring intensity at 15kW / m 3 ;Turn on the DC regulated power supply, apply a voltage of 1.2V to the spiral wound electrode, inoculate the bed with high-temperature domestication sludge according to the inoculation amount of 4g / L, and hang the film for 7 days;

[0080] (2) After the film hanging is completed, the electrolyte solution containing p-fluoronitrobenzene (initial concentration is 60 mg / L) is sent into the bed, and the cathode layer and the anode layer in the spiral-wound electrode alternately degrade the wastewater;...

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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 ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/461
CPCC02F3/005C02F2101/36C02F2101/38C02F2301/106
Inventor 王炎锋冯华军张学勤梁禹翔沈东升周玉央龙於洋汪美贞殷峻
Owner ZHEJIANG GONGSHANG UNIVERSITY
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