Method for deeply treating aromatic nitro-compound wastewater through photo-assisted catalysis

An aromatic nitro, advanced treatment technology, applied in chemical instruments and methods, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc., can solve the problems of low power consumption and increased power consumption of COD

Inactive Publication Date: 2012-10-03
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0017] Existing studies have found that electrolyzing wastewater with a higher concentration requires less power to remove COD per unit mass. When the mass concentration of COD in electrolyzed wastewater is below 1.5g / L, the power consumption increases significantly.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] The wastewater containing aromatic nitro compound nitrobenzene has a COD mass concentration of 1507 mg / L and an aromatic nitro compound content of 79 mg / L.

[0040] 1) Adjust the pH value of the wastewater to 1.5;

[0041] 2) Add ferrous sulfate, a compound containing divalent iron ions, and the amount of iron ions added is 75mg / L;

[0042] 3) The added oxidant is hydrogen peroxide with a mass concentration of 30%, the molar ratio of the added oxidant to iron ions is 55:1, and the catalytic oxidation reaction is carried out at 25 for 30 minutes;

[0043] 4) Irradiate with ultraviolet light with a dominant wavelength of 253.7nm for 30 minutes, and the amount of ultraviolet light irradiation is irradiated with a 5W ultraviolet lamp per liter of wastewater;

[0044] 5) Continue the catalytic oxidation reaction at 5-65°C.

[0045] Example 1 comparison.

[0046] Unlike Example 1, no ultraviolet light irradiation was performed.

[0047] After all the oxidants were consume...

Embodiment 2

[0049] The difference from Example 1 is that the pH value is adjusted to 2.5, the added amount of iron ions is 65mg / L, the reaction is carried out at 35°C, the molar ratio of the added oxidant to iron ions is 50:1, and the ultraviolet light is irradiated for 20 Minutes, the amount of ultraviolet radiation is irradiated with a 15W ultraviolet lamp per liter of wastewater,

[0050] After all the oxidants were consumed, the time to reach the same COD mass concentration in wastewater was 47% less than that of the control group, and the content of aromatic nitro compounds was not detected.

Embodiment 3

[0052] The difference from Example 1 is that the pH value is adjusted to 3.5, the added amount of iron ions is 70mg / L, the reaction is carried out at 35°C for catalytic oxidation reaction, and the reaction is carried out for 15 minutes before light irradiation. The molar ratio of the added oxidant to iron ions is 45:1, 10 minutes of ultraviolet light irradiation, the amount of ultraviolet light irradiation is 20W ultraviolet lamp irradiation per liter of wastewater,

[0053] After all the oxidants were consumed, the time to reach the same COD mass concentration in wastewater was 46% less than that of the control group, and the content of aromatic nitro compounds was not detected.

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Abstract

The invention relates to a method for deeply treating aromatic nitro-compound wastewater through photo-assisted catalysis and belongs to the technical field of catalytic oxidation wastewater treatment. The method comprises the following steps: (1) adjusting a potential of hydrogen (pH) value of the wastewater to be in a range of 1.5-5.5, (2) adding a compound containing ferrous iron ions or ferric iron ions, wherein the adding amount of the iron ions is 5-75 mg / L, (3) adding an oxidizing agent to perform catalytic oxidation reaction at the temperature of 5-65 DEG C for 10-30 minutes, (4) using ultraviolet light with dominant wavelength of 252.7nm to perform irradiation for 5-30 minutes, and (5) continuing to perform the catalytic oxidation reaction at the temperature of 5-65 DEG C, wherein the adding mount of the oxidizing agent is 0-50% of total oxidizing agent amount. By applying a small amount of iron-ionic catalyst and with the assist of ultraviolet light irradiation, oxidation treatment of the low-concentration aromatic nitro-compound wastewater is efficiently performed, the time required by reaction for reducing chemical oxygen demand (COD) and removing a toxicant aromatic nitro-compound is shortened, and biochemical treatment is easily performed.

Description

technical field [0001] The invention relates to the technical field of catalytic oxidation treatment of wastewater, in particular to a method for advanced treatment of aromatic nitro compound wastewater by photocatalysis. Background technique [0002] Hydrogen peroxide (also known as hydrogen peroxide) and oxygen, as the cheapest and cleanest oxygen sources, have become the focus of research and development in oxidation reactions. The types of oxidation using hydrogen peroxide as the oxidant include acid oxidation, biodegradation, Fenton reagent oxidation, activated carbon catalytic oxidation, ozone-hydrogen peroxide chemical oxidation, etc. Research in this field is relatively active. [0003] With the rapid development of industry and agriculture in our country, there are more and more toxic or refractory organic components in water, and how to deal with such substances and improve their treatment effect has become a topic of concern in the water treatment industry. In re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/08C02F101/38
Inventor 吴玉凯丁春淡祝婕王雪梅谢嫚祝文秀王倩吴京
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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