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Method for treating metronidazole wastewater by utilizing photocatalytic oxidation technology

A photocatalytic oxidation and technical treatment technology, applied in the field of metronidazole wastewater treatment by photocatalytic oxidation technology, can solve the problems of poor removal effect of antibiotic wastewater, low adsorption capacity, poor selectivity, etc., and achieve high light energy utilization efficiency, Efficient degradation of mineralization, strong pH impact ability

Inactive Publication Date: 2020-01-10
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the adsorption materials that have been tested for the removal of metronidazole in water include activated carbon, fly ash, rice husk ash, bentonite, montmorillonite, and sludge activated carbon. Among them, activated carbon and its improved materials have the best effect, and the removal rate can reach 90%. % or more, but the cost is relatively high. Although other materials have price advantages, they generally have problems such as poor selectivity and low adsorption capacity, especially for low-concentration antibiotic wastewater. The removal effect is poor. Therefore, it is necessary to develop green and efficient technologies It is very necessary for the treatment of saline phenol wastewater

Method used

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  • Method for treating metronidazole wastewater by utilizing photocatalytic oxidation technology
  • Method for treating metronidazole wastewater by utilizing photocatalytic oxidation technology
  • Method for treating metronidazole wastewater by utilizing photocatalytic oxidation technology

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Choose a concentration of 25mg / L and a volume of 10m 3 Metronidazole wastewater is the target pollutant, 4kg of prepared photocatalytic material is added, and a 250w tungsten halogen lamp is used as the light source to degrade the pollutants. Specific steps are as follows:

[0037] (1) Weigh 4kg of photocatalytic material in 10m 3 Stir and mix in metronidazole wastewater to adjust pH=5.

[0038] (2) The wastewater is introduced into the photocatalytic reaction tank with a 250w halogen lamp light source.

[0039] (3) Turn on the stirring device, and add H dispersedly according to the spatial distribution of the stirrer 2 O 2 Solution and start the reaction timing;

[0040] (4) Use a 5 mL syringe to suck 3 to 4 mL of the reaction solution every 15 minutes, and pass the solution through a 0.22 μm water-based polyethersulfone filter.

[0041] (5) The concentration of the filtered solution was measured by HPLC. At the same time, the reaction system without adding photocatalytic mate...

Embodiment 2

[0044] Choose a concentration of 25mg / L and a volume of 10m 3 Metronidazole wastewater is the target pollutant, 4kg of prepared photocatalytic material is added, and a 250w tungsten halogen lamp is used as a light source to degrade the pollutants. Specific steps are as follows:

[0045] (1) Weigh 4kg of photocatalytic material in 10m 3 Stir and mix in metronidazole wastewater to adjust pH=5.

[0046] (2) The wastewater is introduced into the photocatalytic reaction tank with a 250w halogen lamp light source.

[0047] (3) Turn on the stirring device, and add H dispersedly according to the spatial distribution of the stirrer 2 O 2 Solution and start the reaction timing;

[0048] (4) Use a 5 mL syringe to suck 3 to 4 mL of the reaction solution every 15 minutes, and pass the solution through a 0.22 μm water-based polyethersulfone filter.

[0049] (5) The concentration of the filtered solution was measured by HPLC. At the same time, the pH=2 and pH=10 reaction systems were used as control...

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Abstract

The invention discloses a method for treating metronidazole wastewater by utilizing a photocatalytic oxidation technology. The method comprises: (1) preparing a terephthalic acid-iron metal frameworkmaterial; (2) discharging metronidazole-containing wastewater into a photocatalytic reaction tank; (3) adding a photocatalyst into the reaction tank; (4) uniformly adding hydrogen peroxide on a spatial scale while starting a stirring device in the reaction tank; (5) directly carrying out illumination treatment on the wastewater by utilizing sunlight on sunny days, and turning on a lamp source of acover plate at the top of the reaction tank on rainy days and at night; (6) after the illumination reaction is finished, discharging the wastewater into a precipitation tank; (7) discharging the supernatant after the precipitation; and (8) recovering the photocatalytic material naturally settled in the precipitation tank, and sending the photocatalytic material back to the photocatalytic reactiontank. According to the invention, the method achieves the efficient photodegradation of metronidazole-containing wastewater, and has advantages of simple process, no secondary pollution and strong pHfluctuation resistance.

Description

Technical field [0001] The invention belongs to the technical field of environmental protection, and is specifically a method for treating metronidazole wastewater by using photocatalytic oxidation technology. Background technique [0002] Metronidazole in wastewater is not discharged up to the standard, which will directly cause the death of crops, animals, etc., or accumulate in natural media such as water and soil, affect ecological balance, or threaten people's lives and lives through diet, skin contact, etc. Safety. At present, the adsorption materials that have been tested for the removal of metronidazole in water include activated carbon, fly ash, rice husk ash, bentonite, montmorillonite, and sludge activated carbon. Among them, activated carbon and its improved materials have the best effect, with a removal rate of 90 % Above, but the cost is relatively high. Although other materials have price advantages, they generally have problems such as poor selectivity and low ad...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/72C02F1/30B01J31/28B01J31/30C02F101/38
CPCC02F1/725C02F1/722C02F1/30B01J31/28B01J31/30C02F2305/10C02F2101/38B01J35/39
Inventor 赵林孙同杨永奎凌佳玉
Owner TIANJIN UNIV
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