Method for removing ibuprofen and naproxen in water by weak current stimulation enhanced microorganisms

An electrical stimulation and microorganism technology, applied in the field of environmental pollutant removal, can solve the problems of low removal efficiency of ibuprofen and naproxen, and achieve the effect of high removal efficiency and high removal efficiency

Pending Publication Date: 2022-07-01
LANZHOU UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problem of low removal efficiency of ibuprofen and naproxen in existing water bodies, the present invention provides the following technical solutions:

Method used

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  • Method for removing ibuprofen and naproxen in water by weak current stimulation enhanced microorganisms
  • Method for removing ibuprofen and naproxen in water by weak current stimulation enhanced microorganisms
  • Method for removing ibuprofen and naproxen in water by weak current stimulation enhanced microorganisms

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Experimental program
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Effect test

Embodiment 1

[0036] This embodiment provides a kind of method that weak electric stimulation strengthens microorganism to remove ibuprofen and naproxen in water, comprises the following steps:

[0037] (1) Construct the reactor system of carbon fiber electrode, reference electrode and electrolyte.

[0038] (2) Using 1-10mg / L ibuprofen and naproxen as the selection pressure, using municipal aerobic activated sludge as the inoculation source, inoculating according to the volume ratio of 5%, consisting of sodium acetate (20mM) and basic mineral salts The sterilized culture system was cultured at 30°C for 5-7 days in the dark, and then 5% of the culture was transferred to a new sterilized culture system, and the degradation efficiency of ibuprofen and naproxen reached 70%. above.

[0039](3) Add 10% volume ratio of the enriched solution obtained in (2) to the system composed of sodium acetate (20 mM) and electrolyte, add 5 mg / L ibuprofen or 2 mg / L naproxen, and inject into the reactor In the...

Embodiment 2

[0052] like figure 1 As shown, the bipolar chamber bioelectrochemical reactor in this embodiment is composed of four parts: a working electrode chamber 1 , a counter electrode chamber 2 , a cation exchange membrane 3 and a carbon fiber electrode 4 . Both the working electrode chamber 1 and the counter electrode chamber 2 are provided with liquid exchange ports 7 and 8 . Carbon fiber electrodes 4 are fixed in the working electrode chamber 1 and the counter electrode chamber 2 . The carbon fiber electrodes 4 in the working electrode chamber 1 and the counter electrode chamber 2 are respectively connected with the positive and negative electrodes of the external power supply 5 through wires. A reference electrode 6 is inserted into the working electrode chamber 1 to monitor current or voltage changes by other equipment.

[0053] like figure 2 and 3 As shown, 50 mM phosphate buffer containing 2 mg / L naproxen or 5 mg / L ibuprofen was added to the working electrode chamber, and ...

Embodiment 3

[0055] like Figure 4 and 5 As shown, the difference between this embodiment and the specific example 1 is that the concentration of ibuprofen added to the phosphate buffer in the working electrode chamber is 2 mg / L or 10 mg / L, and the concentration of naproxen is 1 mg / L or 5 mg / L . Externally applied weak electrical stimulation of +0.50V, the removal rates of 2, 5, and 10 mg / L ibuprofen reached 56.5%, 64.3% and 71.1% within 24 hours, respectively, and the removal rate increased slightly with the initial concentration; 1 mg / L of ibuprofen The removal rate of naproxen within 48h was 77.6%, the removal rate of 2 and 5mg / L naproxen within 72h was not much different, and the maximum removal rates were 95.3% and 95.2%, respectively, indicating that the different concentration ranges of cloth Both profen and naproxen were effectively removed.

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Abstract

The invention provides a method for intensively removing ibuprofen and naproxen in water by using external weak current to stimulate microorganisms, which solves the problem of low removal efficiency of ibuprofen and naproxen residues, and is characterized in that enriched functional microorganisms are used as an inoculation source, and carbon fibers are used as electrodes to construct a starting bipolar chamber reaction system; ibuprofen and naproxen can be specifically and efficiently removed under various conditions, and the method comprises the following steps: (1) only applying + 0.50 V weak external electrical stimulation; (2) the method has high removal efficiency on ibuprofen and naproxen with a certain concentration gradient; (3) the method can adapt to buffer solution systems with various concentrations; (4) a conventional pH range of a sewage treatment plant is met, and efficient removal can be realized in a pH range from a meta-acid pH range to a neutral pH range; and (5) different carbon sources support efficient removal. By applying weak current stimulation externally, the method realizes efficient removal of ibuprofen and naproxen residues in water, is not limited by scale, and has the advantages of modular operation, removal of structural analogues, synchronous removal of COD (Chemical Oxygen Demand) and the like.

Description

technical field [0001] The invention relates to the field of removal of environmental pollutants, in particular to a method for high-efficiency enhanced removal of ibuprofen and naproxen in various variable condition systems under weak electricity. Background technique [0002] Ibuprofen and naproxen are common non-steroidal anti-inflammatory drugs, which are widely produced and widely used worldwide due to their good anti-inflammatory, antipyretic and analgesic effects. Most of these drugs ingested into the human body cannot be absorbed and utilized by the human body and are directly released into the sewage system with human excrement. The daily load of ibuprofen and naprox in the sewage treatment plant can reach the gram level. The existing urban sewage treatment system cannot completely remove ibuprofen and naproxen, resulting in a large number of original drugs or their partial conversion products entering the natural water and soil environment through effluent dischar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/00C02F3/34C02F101/34
CPCC02F3/005C02F3/34C02F2101/34
Inventor 云慧李祥锴王振飞梁斌
Owner LANZHOU UNIVERSITY
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