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Erythro micrococcus Em and usage for generating biologic emulsifier as well as degrading polycyclic aromatic hydrocarbon

A bioemulsifier and polycyclic aromatic hydrocarbon technology, which is applied in the field of microbial biotechnology and environmental biology, can solve problems such as poor effect and the industrialization of oil pollution bioremediation technology has not yet been formed.

Inactive Publication Date: 2004-08-11
INST OF MICROBIOLOGY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Regarding the bioremediation technology of oil pollution, some results have applied for patents, and some companies have developed various degreasing bacteria agents and hydrophobic nutritional additives, but the industrialization of oil pollution bioremediation technology has not yet been formed
Our country has also introduced foreign bacterial agents and nutritional additives, but the effect is not good. The main reason is that the composition of oil pollution is different and the environmental conditions are different. Therefore, to solve the oil pollution in our country, we must focus on the oil pollution in our country Take the road of self-reliance and self-development, and develop our own oil pollution evaluation methods, bioremediation technologies and processes, and microbial strain resources

Method used

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  • Erythro micrococcus Em and usage for generating biologic emulsifier as well as degrading polycyclic aromatic hydrocarbon
  • Erythro micrococcus Em and usage for generating biologic emulsifier as well as degrading polycyclic aromatic hydrocarbon
  • Erythro micrococcus Em and usage for generating biologic emulsifier as well as degrading polycyclic aromatic hydrocarbon

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Embodiment 1: the isolation and screening of the Rhodococcus ruber Em bacterial strain provided by the invention

[0033] Soil samples were collected from the crude oil-contaminated soil around the oil wells in Huabei oil field, and 50 grams of the sample was suspended in 50 mL of sterile saline, shaken on a shaker for 30 minutes to fully suspend, and left to stand for 30 minutes, and 10 mL of the upper suspension was inoculated into 100 mL of inorganic salts In the medium (medium composition: K 2 HPO 4 ·3H 2 O, 1g; KH 2 PO 4 , 1g; MgSO 4 ·7H 2 O, 0.5g; NH 4 NO 3 , 1g; CaCl 2 , 0.02g; FeCl 3 Trace amount; alkanes, 1g or aromatic hydrocarbons, 0.1g; distilled water, 1000mL; pH7.0; sterilized at 121°C for 30min), cultivated on a shaker (200rpm) at 30°C for 7 days, took 10mL of the culture solution to inoculate the fresh medium, and press The same operating conditions were continuously acclimatized for 3 times, and then separated by streaking on the inorganic sal...

Embodiment 2

[0034]Embodiment 2: PCR amplification and sequence determination of the 16S rRNA gene of Rhodococcus ruber Em bacterial strain

[0035] Rhodococcus ruber Em strain was inoculated with LB medium, cultured on a shaker at 30°C (200rpm) for 18 hours, centrifuged to collect cells, resuspended, added lysozyme to break the wall, extracted DNA by phenol-chloroform method, and used forward primer 27f(5' -GAGAGTTTGATCCTGGCTCAG-3') and reverse primer 1541r (5'-AAGGAGGTGATCC AGCC-3') are universal primers for PCR amplification of its 16S rDNA, and the amplified products are sent to Shanghai Jikang Company for sequencing. The PCR conditions are: 95°C, 10min; 94°C, 1min, 48°C, 1min, 72°C, 1min; 30 cycles, 72°C, 5min, 4°C storage. The length of the 16S rDNA sequence is 1398bp, and the sequence accession number in GenBank is AF529079, which is similar to the strain Rhodococcus rubber DSM43338 T The sequence similarity of 16S rDNA (accession number: X80625) is 99%. See Sequence Table 1 and F...

Embodiment 3

[0036] Embodiment 3: Rhodococcus ruber Em bacterial strain provided by the invention is to the degradation of polycyclic aromatic hydrocarbons

[0037] Get the fresh slant bacterial classification of this bacterial strain, inoculate an inoculation loop in the Erlenmeyer flask that 100mL containing different petroleum hydrocarbons as the inorganic salt medium (substratum composition is the same as embodiment 1) of carbon source is housed, 30 ℃ of shaker cultures (200rpm ) for 3 days, measure the growth of bacteria (OD 460 ) and the degradation (HPLC) of hydrocarbons, the results are shown in Figure 6, and Figure 6-1 shows that to 200mg / L of benzene, after 3 days of cultivation, the degradation rate can reach 95%; Figure 6-2 shows that, For 100mg / L naphthalene, the degradation rate can reach 99%; Figure 6-3 shows that for 50mg / L anthracene, the degradation rate can reach 67%; Figure 6-4 shows that for 50mg / L pyrene, the degradation rate can be up to 13%.

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Abstract

A Rhodococcus ruber Em (CGMCC No.0868) features that its cells, cell suspension, or immobilized cells can degradate the paraffin and polycyclic arylhydrocarbon because the paraffin and polycyclic arylhydrocarbon are used as its only carbon source and energy source for growing to generate the bioemulsifier of ester. Said emulsifier can obviously decrease the surface tension of aqueous solution, has strong emulsifying power to ester substance, and can increase the solubility of paraffin and polycyclic arylhydrocarbon in water, so it can be used for treating the oil-contained sewage and repairing the petroleum polluted soil.

Description

technical field [0001] The invention belongs to the field of microbial biotechnology and environmental biotechnology. Specifically, it relates to a strain of Rhodococcus ruber Em CGMCC No.0868 bacterial strain. Hexane and other alkanes and anthracene, phenanthrene, pyrene and other polycyclic aromatic hydrocarbons; the strain can grow with alkanes or polycyclic aromatic hydrocarbons as the only carbon source and energy source, and at the same time produce lipid bioemulsifier; the emulsifier can significantly reduce the surface tension of the aqueous solution , It has a strong emulsifying ability of oily substances, improves the solubility of alkanes and polycyclic aromatic hydrocarbons in water, and obviously promotes the degradation of alkanes and polycyclic aromatic hydrocarbons by active strains. The bacterial strain and the biological emulsifier produced by it are suitable for biological treatment of oily wastewater and biological restoration (biological remediation) of oi...

Claims

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Application Information

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IPC IPC(8): C02F3/34C09K17/14C12N1/20C12N1/21C12N15/31C12P1/04
Inventor 刘志培李习武刘双江杨惠芳贾省芬沈锡辉吴建峰
Owner INST OF MICROBIOLOGY - CHINESE ACAD OF SCI
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