Method and device for degrading nitrobenzene waste water through reinforced iron-carbon micro-electrolysis-ozonation method

A technology for iron-carbon micro-electrolysis and nitrobenzene wastewater, which is applied in chemical instruments and methods, oxidized water/sewage treatment, water pollutants, etc., and can solve the problems of passivation and deactivation of fillers, limited efficiency improvement, and blocked electrolysis reactions. problem, to achieve high reaction rate, reduce ozone consumption, reduce the effect of loss

Pending Publication Date: 2016-08-24
ZHONGBEI UNIV
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  • Abstract
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Problems solved by technology

[0009] The present invention provides an enhanced iron-carbon micro-electrolysis-ozone oxidation solution for the problems that the filler is passivated and deactivated after the iron-carbon micro-electrolysis bed is operated for a long time in the prior art, the electrolysis reaction is hindered, and the efficiency of the catalyst for ozonation and degradation of wastewater is limited. Method and device for degrading nitrobenzene wastewater

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  • Method and device for degrading nitrobenzene waste water through reinforced iron-carbon micro-electrolysis-ozonation method

Examples

Experimental program
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Effect test

Embodiment 1

[0033] Example 1: Using figure 1 The flow chart of the device shown is for the treatment of wastewater containing nitrobenzene. The initial concentration of nitrobenzene in the wastewater was 300 mg / L, and the pH value was 2. In the micro-electrolyzer, the concentration of scrap iron chips is 20g / L, the mass ratio of iron to carbon is 3:1, the ultrasonic output power is 8kW, the frequency is 40 KHz, and the cooling water flow rate in the jacket and external circulation is 60L / h. will be 1m 3 After the nitrobenzene wastewater was injected into the micro-electrolyzer for 30 minutes, 99% of the nitrobenzene was reduced to aniline, and the reaction rate was 7 times higher than that of the traditional iron-carbon micro-electrolysis method, and the free Fe in the wastewater 2+ Concentration increased by 6.2 times. After the micro-electrolysis is completed, the wastewater is subjected to high-gravity-ozone oxidation for deep degradation. The rotation speed of the rotating packed b...

Embodiment 2

[0034] Example 2: Using figure 1 The flow chart of the device shown is for the treatment of wastewater containing nitrobenzene. The initial concentration of nitrobenzene in the wastewater was 500 mg / L, and the pH value was 2.5. In the micro-electrolyzer, the concentration of scrap iron chips is 30 g / L, the mass ratio of iron to carbon is 1:3, the ultrasonic output power is 6 kW, the frequency is 20 KHz, and the flow rate of cooling water in the jacket and external circulation is 45 L / h. will be 1m 3 After the nitrobenzene wastewater was injected into the micro-electrolyzer and reacted for 45 minutes, 96% of the nitrobenzene was reduced to aniline, and the reaction rate was 10 times higher than that of the traditional iron-carbon micro-electrolysis method, and the free Fe in the wastewater 2+ Concentration increased by 8 times. After the micro-electrolysis is completed, the wastewater is subjected to high-gravity-ozone oxidation for deep degradation. The rotation speed of th...

Embodiment 3

[0035] Example 3: Using figure 1 The flow chart of the device shown is for the treatment of wastewater containing nitrobenzene. The initial concentration of nitrobenzene in the wastewater was 100 mg / L, and the pH value was 4. In the micro-electrolyzer, the concentration of scrap iron chips is 10 g / L, the mass ratio of iron to carbon is 1:1, the ultrasonic output power is 4 kW, the frequency is 30 KHz, and the flow rate of cooling water in the jacket and external circulation is 30 L / h. will be 1m 3 After the nitrobenzene wastewater was injected into the micro-electrolyzer for 40 minutes, 99% of the nitrobenzene was reduced to aniline, the reaction rate was 6 times higher than that of the traditional iron-carbon micro-electrolysis method, and the free Fe in the wastewater 2+ Concentration increased by 5 times. After the micro-electrolysis is completed, the wastewater is subjected to high-gravity-ozone oxidation deep degradation, the rotary packed bed speed is 600 rpm, the liq...

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Abstract

The invention belongs to the technical field of ozonation waste water treatment, and particularly relates to a method and device for degrading nitrobenzene waste water through a reinforced iron-carbon micro-electrolysis-ozonation method. The problems that in the prior art, after an iron-carbon micro-electrolysis bed operates for a long time, filler is passivated and inactivated, an electrolytic reaction is blocked, and the efficiency improving range of a catalyst to ozonation degradation of the waste water is limited are solved. Firstly, the nitrobenzene waste water is placed in an iron-carbon micro-electrolysis bath, ultrasonic waves are used for assisting, nitrobenzene hard to degrade is fast reduced into aniline easy to degrade under the common action of ultrasound / iron-carbon micro-electrolysis, and meanwhile Fe2+ is released into the waste water after the electrolytic reaction; then the waste water is fed into supergravity equipment to fully react with ozone, and residual organic pollutants in the waste water are deeply oxydatively degraded. The reaction rate of iron-carbon micro-electrolysis is overall increased by 6-10 times, meanwhile, the concentration of free Fe2+ in the waste water is increased by 5-8 times, and the use amount of the ozone in the subsequent supergravity-ozonation method is greatly reduced.

Description

technical field [0001] The invention belongs to the technical field of nitrobenzene wastewater treatment, and specifically relates to a method and device for degrading nitrobenzene wastewater by strengthening iron-carbon micro-electrolysis-ozone oxidation method, which adopts ultrasonic technology, iron-carbon micro-electrolysis method and ozone oxidation method Working together to treat nitrobenzene wastewater. Background technique [0002] The iron-carbon micro-electrolysis technology uses waste iron scraps and activated carbon particles as the filler of the reactor, and uses the difference in redox potential of iron and carbon to form countless tiny primary batteries in the reactor to reduce and degrade organic pollution in wastewater things. The reaction formula is as follows: [0003] anode: E(Fe / Fe 2+ ) = 0.44 V (Equation 1) [0004] cathode: E(H + / H 2 ) = 0.00 V (Equation 2) [0005] In the reaction, iron as the anode loses electrons and transfers to the c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/06
CPCC02F9/00C02F1/36C02F1/461C02F1/78C02F1/725C02F2101/38C02F2301/08
Inventor 刘有智焦纬洲余丽胜申红艳栗秀萍祁贵生袁志国张巧玲高璟罗莹
Owner ZHONGBEI UNIV
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