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Method for treating organic wastewater by using sodium bismuthate and plasma

A plasma and organic wastewater technology, applied in the field of wastewater treatment, can solve the problems of limited deep mineralization capacity and high dosage of sodium bismuthate, and achieve the effects of short reaction time, simple operation and improved removal efficiency

Inactive Publication Date: 2015-06-03
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Chinese patent CN 101734814 B (a method for rapidly degrading organic dye wastewater) introduces adding sodium bismuthate to the wastewater adjusted to acidity by adding acid and stirring to react, the dosage is 1g / L-4g / L, different dye wastewater The removal rate of TOC is 16%‐34%. This method does not require external energy, but the dosage of sodium bismuthate is relatively high, and the deep mineralization ability is limited.
In the prior art, there is no relevant report on the combination of sodium bismuthate and discharge plasma technology

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0027] Prepare 100mg / L aniline simulated wastewater with a pH value of 6.5. Weigh 0.2g NaBiO 3 2H 2 O was added to 250mL solution, stirred evenly, and placed in a dark place for 30min figure 1 In the dielectric barrier discharge device shown. The output voltage of the AC power supply is adjusted to 20kV, the discharge frequency is 17Hz, the high-voltage electrode is in contact with the liquid surface, and the reaction is carried out at room temperature and pressure for 10 minutes. The results show that the removal rate of aniline in wastewater can reach 62.81%, and the removal rate of TOC is 45.12%. Under the same experimental conditions, the removal rate of simulated aniline wastewater treated by dielectric barrier discharge alone was 42.16%, and the removal rate of TOC was 29%. Add 0.2g NaBiO separately 3 2H 2 The removal rate of O was 5.11% for aniline and 0.9% for TOC under sunlight for 10 minutes.

Embodiment 2

[0029] Prepare 100mg / L aniline simulated wastewater with a pH value of 6.5. Take 250mL simulated wastewater, adjust the pH to 10 with 0.1mol / L NaOH, weigh 0.2g NaBiO 3 2H 2 Add O into the solution, stir evenly, and put it in the dark place for 30 minutes figure 1 In the dielectric barrier discharge device shown. The output voltage of the AC power supply is adjusted to 20kV, the discharge frequency is 17Hz, the high-voltage electrode is in contact with the liquid surface, and the reaction is carried out at room temperature and pressure for 10 minutes. The results showed that the removal rate of aniline in wastewater was 44.39%, and the removal rate of TOC was 28.64%. Under the same experimental conditions, the removal rate of simulated aniline wastewater treated by dielectric barrier discharge alone was 29.76%, and the removal rate of TOC was 12.34%. Add 0.2g NaBiO separately 3 2H 2 The removal rate of O was 3.06% for aniline and 0.07% for TOC under fluorescent light for ...

Embodiment 3

[0031] Prepare 25mg / L aniline simulated wastewater with a pH value of 6.5. Weigh 0.05g NaBiO 3 2H 2 O was added to 250mL solution, stirred evenly, and placed in a dark place for 30min figure 1 In the dielectric barrier discharge device shown. The output voltage of the AC power supply is adjusted to 18kV, the discharge frequency is 17Hz, the high-voltage electrode is in contact with the liquid surface, and the reaction is carried out at normal temperature and pressure for 10 minutes. The results show that the removal rate of aniline in aniline wastewater can reach 91.24%, and the removal rate of TOC is 54.87%. Under the same experimental conditions, the removal rate of simulated aniline wastewater treated by dielectric barrier discharge alone was 80.22%, and the removal rate of TOC was 6.29%. Add 0.05g NaBiO3·2H separately 2 The removal rate of O and aniline was 10.35% and TOC removal rate was 2.17% under fluorescent light for 10 min.

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Abstract

The invention relates to a method for treating organic wastewater by using sodium bismuthate and a plasma. The method comprises the following steps: adding an agent of sodium bismuthate into the organic wastewater, mixing uniformly, adding the organic wastewater into a plasma discharge device, and treating the organic wastewater. The method provided by the invention integrates the discharge plasma technology with the photocatalysis of sodium bismuthate and can be used for treating wastewater rapidly and effectively. By inducing sodium bismuthate to generate active particles by using streamer which is generated in the process of stopping discharging by using an electric arc and a medium as a light source, the content of active components in a reaction system can be increased, and the oxidative decomposition and mineralization efficiency of organic pollutants can be improved.

Description

technical field [0001] The invention belongs to the technical field of waste water treatment, and relates to a method for treating waste water containing organic pollutants, in particular to a method for treating organic waste water with sodium bismuthate and plasma. Background technique [0002] In recent years, discharge plasma technology has been widely researched and applied in wastewater treatment. The principle is that high-energy electrons are generated during the discharge process, and the electrons carrying a large amount of energy will collide with the gas or liquid around the discharge, and transfer energy to these atoms and molecules, causing them to ionize and electron avalanches to become excited groups , resulting in a large number of activated particles, photons, free radicals, etc., such as ·OH, ·H, ·O 2 H, H 2 o 2 , O 3 Wait. On the one hand, high-energy electrons can directly collide with pollutant molecules, so that the pollutants are activated in an...

Claims

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Application Information

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IPC IPC(8): C02F1/30C02F1/72C02F1/78C02F1/46
CPCY02W10/37
Inventor 徐炎华武海霞周侗梁文康治金
Owner NANJING UNIV OF TECH
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