Method and device for treating nitrobenzene wastewater through ultrasonic wave/iron-carbon micro-electrolysis-Fenton oxidation method
A technology of nitrobenzene wastewater and iron-carbon micro-electrolysis, applied in water/sewage treatment, chemical instruments and methods, multi-stage water/sewage treatment, etc., can solve the problems of reduced treatment efficiency, weakened anode reaction, low efficiency, etc. Achieve the effect of increasing reaction rate, reducing H2O2, and removing easy passivation
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Embodiment 1
[0032] Example 1: Using figure 1 The flow chart of the device shown is for the treatment of wastewater containing nitrobenzene. The concentration of nitrobenzene in the water sample is 350 mg / L, and the pH value is 2. Inject 2 cubic meters of nitrobenzene wastewater into the micro-electrolyzer, the concentration of scrap iron is 10g / L, the mass ratio of iron to carbon is 1:1, the ultrasonic output power is 6kW, and the flow rate of cooling water circulating inside and outside the jacket is 45L / h , reacted for 40 min, 90% of nitrobenzene was reduced to aniline, the reaction rate was 8 times higher than that of the traditional iron-carbon micro-electrolysis method, and the free Fe in the wastewater 2+ Concentration increased by 6.8 times. At this time, inject the wastewater in the micro-electrolyzer into the stirred reaction tank, and add H at the same time 2 o 2 The concentration is 0.025mol / L, the stirring rate of the agitator is 200 rpm, and after 25 minutes of reaction, ...
Embodiment 2
[0033] Example 2: Using figure 1 The flow chart of the device shown is for the treatment of wastewater containing nitrobenzene. The concentration of nitrobenzene in the water sample is 500 mg / L, and the pH value is 3. Inject 2 cubic meters of nitrobenzene wastewater into the micro-electrolyzer, the concentration of scrap iron is 30 g / L, the mass ratio of iron to carbon is 3:1, the ultrasonic output power is 8kW, and the flow rate of cooling water circulating inside and outside the jacket is 25 L / h, reacted for 40 min, 96% of nitrobenzene was reduced to aniline, the reaction rate increased by 10 times compared with the traditional iron-carbon micro-electrolysis method, and the free Fe in the wastewater 2+ Concentration increased by 8 times. At this time, inject the wastewater in the micro-electrolyzer into the stirred reaction tank, and add H at the same time 2 o 2 The concentration is 0.04mol / L, the stirring rate of the agitator is 300 rpm, and the mineralization rate of ...
Embodiment 3
[0034] Example 3: Using figure 1 The flow chart of the device shown is for the treatment of wastewater containing nitrobenzene. The concentration of nitrobenzene in the water sample is 300mg / L, and the pH value is 4. Inject 2 cubic meters of nitrobenzene wastewater into the micro-electrolyzer, the concentration of scrap iron is 20 g / L, the mass ratio of iron to carbon is 1:3, the ultrasonic output power is 4kW, and the flow rate of cooling water circulating inside and outside the jacket is 25 L / h, reaction 35 min, 95% of nitrobenzene is reduced to aniline, the reaction rate is 6 times higher than the traditional iron-carbon micro-electrolysis method, and the free Fe in the wastewater 2+ Concentration increased by 5 times. At this time, inject the wastewater in the micro-electrolyzer into the stirred reaction tank, and add H at the same time 2 o 2 The concentration is 0.01mol / L, the stirring speed of the stirrer is 100 rpm, and after 30 minutes of reaction, the mineralizat...
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