CN108002543B

CN108002543B - Application of acinetobacter to degradation of ultraviolet absorbent PBSA

Info

Publication number: CN108002543B
Application number: CN201711243597.2A
Authority: CN
Inventors: 金超; 庞鑫彤; 张曦媛; 关春峰
Original assignee: Tianjin University
Current assignee: Tianjin University
Priority date: 2017-11-30
Filing date: 2017-11-30
Publication date: 2020-07-31
Anticipated expiration: 2037-11-30
Also published as: CN108002543A

Abstract

The invention discloses application of Acinetobacter (Acinetobacter Sp.) with a deposit number of ATCC 15566 to degradation of an ultraviolet absorbent PBSA. Experiments prove that the degradation rate of Acinetobacter (Acinetobacter Sp.) ATCC 15566 for degrading the ultraviolet absorbent PBSA is about 70%.

Description

Application of acinetobacter to degradation of ultraviolet absorbent PBSA

Technical Field

The invention belongs to the field of domestic sewage treatment, and particularly relates to application of an acinetobacter ultraviolet absorbent PBSA.

Background

In recent years, ultraviolet absorbers have been widely used in ultraviolet-sensitive and UV-sensitive chemicals such as plastics, paints, cosmetics and washing products, and have a stabilizing and discoloration-preventing effect. With the prolonging of the service life, the domestic sewage, the hospital and factory wastewater and the farmland drainage are gradually released into the water environment. Among them, the ultraviolet absorber (2-phenylbenzimidazole-5-sulfonic acid, PBSA) is widely used in various cosmetics and sunscreen creams as a typical ultraviolet absorber. PBSA has the molecular formula of C₁₃H₁₀N₂O₃The molecular weight of the PBSA is 274.30, the PBSA can directly enter the environmental water body through the washing of skin and clothes and the like, and can also indirectly enter the water environment through the approaches of sewage plants, swimming pools and the like, and the exposure concentration of the PBSA in the water environment system is reported to reach 109-^-1. Recent studies have shown that PBSA photolyzes under uv irradiation to generate reactive oxygen species and cause DNA damage. Therefore, the long-term widespread use of UV absorbers can cause irreversible damage to the aquatic systems, and therefore, research for transferring and degrading PBSA in the aquatic systems is very necessary.

For the removal of organic substances, advanced oxidation, membrane filtration, biological treatment techniques, and the like can be generally used. The advanced oxidation method has high efficiency of removing pollutants, but has less practical application because of high construction cost and less current toxicological research on degradation products. Nanofiltration and some membrane composite processes (such as an activated carbon-ultrafiltration composite process and an MBR process) are also researched more, and in practical application, the carrier device has the defects that the volume is limited, the amount of microorganisms attached to the surface of the carrier is difficult to control and the like, and the carrier device is not applied in a large scale.

The biological treatment technology is to decompose organic matters in the water body into CO by utilizing the mineralization or CO-metabolism of microorganisms₂And H₂O, or organic acid and alcohol, etc., thereby achieving the purpose of purifying the sewageThe purpose of the water. But finding microorganisms that can degrade the uv absorber PBSA is a problem.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provide the application of the acinetobacter degradation ultraviolet absorbent PBSA.

The technical scheme of the invention is summarized as follows:

use of Acinetobacter Sp for degrading a PBSA, wherein the Acinetobacter Sp is deposited under the accession number ATCC 15566.

The invention has the advantages that:

experiments prove that the degradation rate of Acinetobacter (Acinetobacter Sp.) ATCC 15566 for degrading the ultraviolet absorbent PBSA is about 70%.

Drawings

FIG. 1 is a graph of the degradation of PBSA by Acinetobacter strains.

Detailed Description

The present invention will be further illustrated by the following specific examples.

Acinetobacter strain was deposited under ATCC 15566 and purchased from North Nay organisms at 2016, 12 months.

Example 1

Culture and detection of Acinetobacter (Acinetobacter Sp.) ATCC 15566 (Acinetobacter):

(1) preparation of acinetobacter seed liquid:

inoculating Acinetobacter (purchased from North Navier, and having the strain accession number of ATCC 15566) in a PBSA-containing liquid culture medium, and culturing at 25 ℃ to logarithmic phase to prepare a seed solution;

the PBSA-containing liquid culture medium: [ PBSA]＝5mg/L，[K₂HPO₄]＝3.5g/L；[KH₂PO₄]＝1.5g/L；[(NH₄)₂SO₄]＝0.5g/L；[NaCl]＝0.5g/L；[MgSO₄·7H₂O]Adjusted to 0.15 g/L, and sterilized with trace elements at 121 ℃ for 20 min.

The trace elements are: [ NaHCO ]₃]＝0.65g/L，[MnSO₄·H₂O]＝0.2g/L，[ZnSO₄·7H₂O]＝0.2g/L，[CuSO₄·5H₂O]＝0.1g/L，[CoCl₂·6H₂O]＝0.5g/L，[CaCl₂·2H₂O]＝0.05g/L，[FeSO₄·7H₂O]＝0.5g/L。

(2) Optimizing degradation conditions of strains:

the seed liquid cultured to the logarithmic phase is respectively inoculated into 100m L PBSA-containing liquid culture medium by different inoculation amounts, and the culture is carried out under different conditions, such as the culture temperature is respectively 15 ℃, 25 ℃ and 30 ℃, the rotation speed is respectively 120rpm, 150rpm and 180rpm, and the inoculation amount is respectively 5%, 10% and 20%.

(3) Enrichment and elution of PBSA after strain degradation:

taking out 15m L from the culture medium obtained in the step (2), centrifuging for 20min, extracting the supernatant by using an activated solid phase small column (Oasis H L B6 m L, 500mg), adding 2m L of methanol into the residual slurry, performing ultrasonic treatment three times by using ultrasonic waves for 10 min/time, centrifuging again, diluting the supernatant by using 10m L of deionized water, and finally extracting by using the same solid phase small column.

Activating (pretreating) solid phase column with A.5m L methanol activated C18 column at 2 ml/min;

b.10m L chromatographic grade purified water activates a C18 small column, 2m L/min;

elution of target analyte 10m L methanol eluted the column at a flow rate of 15m L/min;

then, the extract is treated with N₂Drying, and dissolving with acetone;

finally, the solution was filtered through a 0.22 μm frit into an amber liquid vial to which HP L C was assayed.

Liquid chromatography conditions for HP L C analysis:

the column temperature is 30 ℃, the mobile phase is water and acetonitrile with the ratio of 9:1, the flow rate is 1m L/min, and the retention time is 2.5 min.

The results show that the PBSA degradation rate of the acinetobacter strain reaches 70 percent when the acinetobacter strain is cultured for 35 days under the optimal culture conditions (the rotating speed is 150rpm, the temperature is 15 ℃, and the inoculation amount is 20 percent). The results are shown in FIG. 1.

Example 2

Practical application of Acinetobacter strains:

(1) a lake water sample of Yangyu lake of Tianjin university is taken and is detected by HP L C, and no PBSA is detected, 5 mg/L PBSA is added into the obtained lake water sample, the seed solution obtained by the step (1) of the example 1 is cultured to logarithmic phase, the inoculation amount is 20%, the strain is treated for 35 days at normal temperature, and the PBSA is detected by the method of the example 1, and the degradation rate of the strain on the PBSA is found to be 55%.

The present invention has been described in detail, but the above description is only a preferred embodiment of the present invention, and should not be construed as limiting the scope of the present invention. All equivalent changes and modifications made within the scope of the present invention shall fall within the scope of the present invention.

Claims

1. Use of Acinetobacter (Acinetobacter Sp.) having the deposit number ATCC 15566 for degrading a PBSA as an ultraviolet absorber.