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Volume 40 Issue 5
Jul.  2022
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DING Ming-shan, LIU Jing-xuan, SUN Nan, YUAN Zhang-zhong, WANG Wei-dong, LI Xiao-dong, WANG Zhi-jian. BIOAUGMENTATION REMEDIATION OF AGEING OIL-CONTAMINATED SOIL IN DECOMMISSIONED WELL FIELD[J]. ENVIRONMENTAL ENGINEERING , 2022, 40(5): 159-165. doi: 10.13205/j.hjgc.202205023
Citation: DING Ming-shan, LIU Jing-xuan, SUN Nan, YUAN Zhang-zhong, WANG Wei-dong, LI Xiao-dong, WANG Zhi-jian. BIOAUGMENTATION REMEDIATION OF AGEING OIL-CONTAMINATED SOIL IN DECOMMISSIONED WELL FIELD[J]. ENVIRONMENTAL ENGINEERING , 2022, 40(5): 159-165. doi: 10.13205/j.hjgc.202205023

BIOAUGMENTATION REMEDIATION OF AGEING OIL-CONTAMINATED SOIL IN DECOMMISSIONED WELL FIELD

doi: 10.13205/j.hjgc.202205023
  • Received Date: 2021-08-16
    Available Online: 2022-07-02
  • Oil contaminated soils from the decommissioned well site were with low oil content with an increasing heavy fraction over time. Therefore, bioaugmentation was performed to restore the original properties of the aging contaminated soil. The physicochemical properties and indigenous microbial communities of the contaminated soil from a decommissioned well site were systematically analyzed. Various hydrocarbon degrading strains and bio-emulsifiers were screened to promote a high degradation value. Moreover, the preparation method of immobilized strains was optimized to enhance the environmental resistance. It was found that the oil content of the contaminated soils was up to 14.6 mg/g with 57% of heavy component. There was a lack of heavy oil degrading microorganisms in the soils. Two functional degrading strains with synergistic effects were screened and immobilized to improve the efficiency of hydrocarbon degradation. With the addition of 500 mg/L F-3 bio-emulsifier, the degradation time of meeting the standard was reduced from 120 d to 80 d. Thereafter, a 2700 m2 field test was carried out with the land farming method. After 8 months, the oil content was reduced from 14.6 mg/g to 3.30 mg/g, meeting the requirements of state environmental standards, GB 36600-2018. The screened strains were capable of increasing the degradation rate of the aging oil contaminated soils, where the optimized emulsifier and adding method were in favor of reducing the remediation period.
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