Method and device for removing ronidazole in water

A technology for ronidazole and water removal, applied in the field of antibiotic wastewater and ronidazole removal, can solve problems such as ineffective removal and degradation, complex chemical structure, etc., and achieves improved feasibility and operability, simple operation, and reduced Effects of Hazardous Substances

Active Publication Date: 2014-02-26
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

As a representative nitroimidazole substance, ronidazole has a complex chemical ...

Method used

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  • Method and device for removing ronidazole in water
  • Method and device for removing ronidazole in water
  • Method and device for removing ronidazole in water

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] The initial concentration of ronidazole was prepared with ultrapure water at 5 μM (1 mg / L), and the degradation experiments of ronidazole under the three processes were carried out respectively. The experimental operation for the degradation of ronidazole in the chlorine-only process is as follows: the initial pH of the ronidazole solution is adjusted to 7 with an acid-base solution, and chlorine is added to the ronidazole solution so that the dosage of chlorine is [HOCl] 0 =50μM (as Cl 2 The reaction temperature was controlled to be 25 °C; the experimental operation of the degradation of ronidazole under the single ultraviolet process was as follows: the initial pH of the ronidazole solution was adjusted to 7 with an acid-base solution, and the ronidazole solution was subjected to ultraviolet irradiation, and the intensity of the ultraviolet irradiation was controlled to be 10.6μW / cm 2 , the reaction temperature was controlled to be 25 °C; the experimental operation o...

Embodiment 2

[0046] The initial concentration of ronidazole was prepared with ultrapure water to 5 μM (1 mg / L), the initial pH of ronidazole solution was adjusted to 7 with acid-base solution, and chlorine was added to the ronidazole solution, and the amount of chlorine added was controlled to [HOCl] 0 =0, 125, 25, 50, 100, 150 μM (as Cl 2 meter), and UV irradiation was carried out at the same time, and the UV intensity was controlled to be 5.4 μW / cm 2 , in the reaction process, the reaction temperature was controlled to be 25 °C, and the removal rates of ronidazole were 37.7%, 67.6%, 95.8%, 97.3%, and 98.6% after the reaction for 15 minutes. Figure 4 .

[0047] The increase of chlorine dosage increases the concentration of matrix reactants, increases the driving force of the reaction, and effectively improves the rate of the reaction and the removal rate of RNZ.

Embodiment 3

[0049] The initial concentration of RNZ was 5 μM (1 mg / L) prepared with ultrapure water, the initial pH of the ronidazole solution was adjusted to 7 with an acid-base solution, and chlorine was added to the ronidazole solution, and the amount of chlorine added was [HOCl] 0 =50μM (as Cl 2 meter), and UV irradiation was performed at the same time, and the UV intensity was controlled to be 0, 3.0, 5.4, 8.3, and 10.6 μW / cm, respectively. 2 , under the experimental conditions where the reaction temperature was controlled at 25 °C, the removal rates of ronidazole were 0% (15min), 78.9% (15min), 95.8% (15min), 98.9% (15min), 98.4% (8min). See Figure 5 .

[0050] The increase of UV intensity increased the generation rate of hydroxyl radicals, increased the driving force of the reaction, and effectively improved the rate of the reaction and the removal rate of RNZ.

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Abstract

The invention relates to a method for removing ronidazole in water. The method comprises the following steps: pre-treating a water sample to improve an illuminating effect of ultraviolet light to the water sample; carrying out photo-catalytic oxidation on the pre-treated water sample, so that RNZ (Ronidazole) in water is effectively degraded. The method is a photo-catalytic oxidation technology, namely an ultraviolet/chlorine combined process. A certain amount of chlorine is added into water and meanwhile certain chlorine strength is controlled for ultraviolet radiation. The device for realizing the method comprises a reactor, a quartz tube, an ultraviolet lamp, a stirrer, a power supply connecting wire, a water pump and a constant-temperature water bath box, wherein the quartz tube is arranged in the center of the reactor, the stirrer is arranged in the quartz tube, and the ultraviolet lamp is arranged in the reactor and is connected with a power supply through the power supply connecting wire. The reaction time is controlled within 15 minutes to realize the purpose of efficiently removing ronidazole in water. The removal rate can reach over 95%. The method provides a technical support for improving a water purification process of a water plant. The method and device provided by the invention are suitable for treatment of antibiotic wastewater and source water.

Description

technical field [0001] The invention belongs to the technical fields of environmental protection and water treatment, and relates to a technology for removing toxic and harmful organic substances in water, especially a method and device for removing ronidazole (RNZ) in antibiotic waste water and water source water. Background technique [0002] At present, bacterial infection is still the main disease that endangers human health. Systemic and local application of antibiotics is the main way to kill pathogenic bacteria in the body. Nitroimidazoles are widely used in clinic due to their strong bactericidal ability, broad antibacterial spectrum, resistance to drug resistance, low price and good curative effect. [0003] As an emerging pollutant, nitroimidazoles have carcinogenic, teratogenic, mutagenic and genotoxic effects, so they are becoming a new concern in the field of drinking water safety. Foreign countries have begun to pay attention to the residue and removal of nitr...

Claims

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Application Information

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IPC IPC(8): C02F9/08
Inventor 陈英英徐斌马慧荣林琳朱贺振
Owner TONGJI UNIV
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