Method for treating antibiotics in water by using pre-magnetized zero-valent iron/chelating agent system

An antibiotic and pre-magnetization technology, applied in special compound water treatment, oxidized water/sewage treatment, water/sewage treatment, etc., can solve the problems of low reaction rate, reduced reaction activity and pollutant removal rate, etc., to achieve efficient degradation, Effects of Simplifying In-Situ Magnetized Water Treatment Process and Promoting Water Resources Reuse

Pending Publication Date: 2020-12-29
NANKAI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This kind of advanced oxidation technology has shown good application prospects in the removal of chlorinated organics, azo dyes, aromatic compounds and other organic substances, but the passivation film formed during the reaction process is easy to cover the surface of zero-valent iron, which seriously reduces its reactivity. And the removal rate of pollutants, so that the reaction rate is much lower than the Fenton reaction, this defect has become an important obstacle and a bottleneck that needs to be solved urgently in the application of this kind of advanced oxidation technology

Method used

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  • Method for treating antibiotics in water by using pre-magnetized zero-valent iron/chelating agent system
  • Method for treating antibiotics in water by using pre-magnetized zero-valent iron/chelating agent system
  • Method for treating antibiotics in water by using pre-magnetized zero-valent iron/chelating agent system

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Experimental program
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Effect test

Embodiment 1

[0030] 1) Dry-state magnetization of micron-sized iron powder (50 μm) in a magnetic field with a magnetic field strength of 300 mT provided by an electromagnet for 3 min.

[0031] 2) Prepare 500 mL of SMT solution with a concentration of 5 mg / L with deionized water, and adjust the pH of the solution to 5.

[0032] 3) Add the pre-magnetized iron powder pre-Fe obtained in 1) sequentially 0 0.2g / L, chelating agent EDTA 2mM are in the SMT solution that the pH that configures in step 2) is 5.

[0033] 4) The solution obtained in 3) was placed on a mechanical stirrer at a speed of 350 r / min and stirred for reaction in an air environment.

Embodiment 2

[0035] 1) Put micron-sized iron powder (20μm) in 20ml of aqueous solution, magnetize it in a wet state for 5min in a magnetic field with a magnetic field strength of 150mT provided by an electromagnet, and remove the aqueous solution.

[0036] 2) Prepare 500 mL of SMT solution with a concentration of 5 mg / L with deionized water, and adjust the pH of the solution to 6.

[0037] 3) Add the pre-magnetized iron powder pre-Fe obtained in 1) sequentially 0 0.3g / L, chelating agent EDTA 3mM are in the SMT solution that the pH that configures in step 2) is 6.

[0038] 4) The solution obtained in 3) was placed on a mechanical stirrer in an air environment at a speed of 200 r / min and stirred for reaction.

[0039] Compared with pre-magnetized Fe 0 / Chelating agent system, unmagnetized Fe 0 / Chelating agent system and the treatment effect of each single system under the same conditions.

[0040] like figure 1 Shown (the iron powder in embodiment 1 is analyzed), before reaction, unm...

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Abstract

The invention provides a method for treating antibiotics in water by using a pre-magnetized zero-valent iron/chelating agent system, which comprises the following steps: 1) magnetizing micron-sized iron powder by an electromagnet with a magnetization intensity of 150-500mT to obtain pre-magnetized iron powder; and 2) adding the pre-magnetized iron powder obtained in the step 1) and a chelating agent into a water body containing antibiotics. According to the method, the synergistic effect of low-intensity magnetic field pre-magnetization and complexing of a small molecular chelating agent and metal ions is utilized, dissolution of Fe<2+> is accelerated through the magnetic field, a ligand induces efficient activation of O2 to generate H2O2, a Fenton system is spontaneously formed, and antibiotics in the wastewater are effectively oxidized and degraded. Compared with a conventional Fe/H2O2 system, the method has the outstanding characteristics that the treatment rate is higher, an oxidizing agent does not need to be added, the cost is lower, and the application range is wider.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment and environmental protection, and in particular relates to a method for treating antibiotics in water by a pre-magnetized zero-valent iron / chelating agent system. Background technique [0002] Antibiotics are widely used to treat or prevent human and animal diseases around the world. my country is the world's largest producer and consumer of antibiotics. In recent years, due to the abuse of antibiotics in medical and breeding fields, wastewater containing antibiotics Lots of emissions. Among the many types of antibiotics, sulfonamide antibiotics are widely used in various industries such as medical treatment and breeding because of their broad antibacterial spectrum, stable performance, affordable price, and remarkable curative effect. Among them, sulfamethazine (SMT) is the most widely used in animal husbandry production. One of the sulfonamide drugs, it has the characteristics of strong...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/72C02F101/30
CPCC02F1/725C02F1/722C02F2101/40C02F2305/026
Inventor 王薇温佳欣郭宏金
Owner NANKAI UNIV
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