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Method for treating nitrobenzene wastewater by ultraviolet light-reinforced Fenton oxidation

A technology for nitrobenzene wastewater and oxidation treatment, which is applied in the fields of oxidized water/sewage treatment, chemical instruments and methods, special compound water treatment, etc., can solve the problems of poor nitrobenzene wastewater treatment effect, etc. Environmental benefits, ease of implementation, effects of process solutions

Pending Publication Date: 2021-10-22
SINOPEC NANJING RES INST OF CHEM IND CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The purpose of the present invention is to solve the problem that the existing nitrobenzene wastewater treatment effect is not good, and to provide a method for treating nitrobenzene wastewater by ultraviolet light-enhanced Fenton oxidation technology with environmental protection significance. The method has strong operability and reasonable process design , High efficiency of nitrobenzene wastewater treatment, the treated effluent can meet GB 18918-2016 Pollutant Discharge Standard for Urban Sewage Treatment Plants, solve the environmental pollution caused by nitrobenzene wastewater, and achieve sewage discharge standards

Method used

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  • Method for treating nitrobenzene wastewater by ultraviolet light-reinforced Fenton oxidation

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Experimental program
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Effect test

Embodiment 1

[0040] Pour 500ml of nitrobenzene wastewater into a glass container and add H 2 o 2 solution and Fe 2+ The mixed reagent, in the mixed reagent H 2 o 2 with Fe 2+ The molar ratio is 1:4. The mass concentration of hydrogen peroxide in the waste water was 0.1%. After mixing evenly, the pH value of the mixed solution was adjusted to 2.2 with sulfuric acid. Send the above mixed solution into the self-made ultraviolet light oxidation treatment device, adjust the wavelength to 315nm, make it treated in ultraviolet light for 20min, and at the same time carry out aeration treatment on the wastewater; aerate the mixed solution treated by ultraviolet light for 0.5h The pH value of the treated mixed solution is adjusted with NaOH solution to be 8.0, and the upper layer liquid and the lower layer sludge are separated by standing, and the sludge is sent to the sludge collection tank; the upper layer liquid is filtered to obtain qualified process effluent; After the sludge is collected...

Embodiment 2

[0042] Pour 500ml of nitrobenzene wastewater into a glass container and add H 2 o 2 solution and Fe 2+ The mixed reagent, in the mixed reagent H 2 o 2 with Fe 2+The molar ratio is 1:2. The mass concentration of hydrogen peroxide in the wastewater is 0.2%. After mixing evenly, adjust the pH value of the mixed solution to 2.5 with sulfuric acid. Send the above mixed solution into the self-made ultraviolet light oxidation treatment device, adjust the wavelength to 345nm, make it treated in ultraviolet light for 25min, and at the same time carry out aeration treatment on the wastewater; aerate the mixed solution treated by ultraviolet light for 0.8h The pH value of the treated mixed solution is adjusted with NaOH solution to be 8.2, and the upper layer liquid and the lower layer sludge are separated by standing, and the sludge is sent to the sludge collection tank; the upper layer liquid is filtered to obtain the qualified process effluent; After the sludge is collected, the...

Embodiment 3

[0044] Pour 500ml of nitrobenzene wastewater into a glass container and add H 2 o 2 solution and Fe 2+ The mixed reagent, in the mixed reagent H 2 o 2 with Fe 2+ The molar ratio is 1:1. The mass concentration of hydrogen peroxide in the waste water is 0.5%. After mixing evenly, the pH value of the mixed solution is adjusted to 2.5 with hydrochloric acid. Send the above mixed solution into the self-made ultraviolet light oxidation treatment device, adjust the wavelength to 350nm, make it treated in ultraviolet light for 30min, and aerate the wastewater at the same time; aerate the mixed solution treated by ultraviolet light for 1.0h The pH value of the treated mixed solution is adjusted with NaOH solution to be 8.2, and the upper layer liquid and the lower layer sludge are separated by standing, and the sludge is sent to the sludge collection tank; the upper layer liquid is filtered to obtain the qualified process effluent; After the sludge is collected, the sludge is pre...

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Abstract

The invention belongs to the field of environmental protection, and relates to a nitrobenzene wastewater treatment method. The nitrobenzene wastewater is treated by an ultraviolet light and Fenton oxidation combined technology, so that the treatment problem of the nitrobenzene wastewater is solved. The method includes: adding a mixed reagent of an H2O2 solution and Fe 2+ into the nitrobenzene wastewater to be treated; then, treating the mixed solution in ultraviolet light, and meanwhile, carrying out aeration treatment on the wastewater; aerating the mixed solution subjected to ultraviolet light treatment to carry out oxidation reaction; adjusting the pH value of the treated mixed solution, and separating out upper-layer liquid and lower-layer sludge; filtering the upper-layer liquid to obtain process effluent reaching the standard; and collecting the sludge, and performing filter pressing and filter cake making.

Description

technical field [0001] The invention belongs to the field of environmental protection, and relates to a method for treating nitrobenzene wastewater, in particular to a method for treating nitrobenzene wastewater by using ultraviolet light enhanced Fenton oxidation technology, and belongs to the technical field of wastewater treatment. Background technique [0002] Nitrobenzene is a raw material for organic synthesis and an important organic solvent. [0003] Nitrobenzene in the environment mainly comes from waste water and waste gas from chemical plants and dye factories. Accidents during storage and transportation will also cause serious pollution of nitrobenzene. [0004] Nitrobenzene has extremely high stability in water. Because its density is higher than that of water, nitrobenzene that enters the water body will sink to the bottom of the water and remain unchanged for a long time. And because it has a certain solubility in water, it will cause water pollution. will la...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/08C02F1/72C02F1/32C02F101/34C02F101/38
CPCC02F1/32C02F1/722C02F1/725C02F9/00C02F2101/34C02F2101/38C02F2305/026C02F1/66C02F2001/007C02F1/001C02F1/72
Inventor 张蓉蓉丁红霞黄伟
Owner SINOPEC NANJING RES INST OF CHEM IND CO LTD
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