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Use of Bacillus-siamensis-inoculated biochar to decrease uptake of dibutyl phthalate in leafy vegetables.

Fayun Feng1, Xiaolong Chen2, Qiong Wang2

  • 1Jiangsu Key Laboratory for Food Quality and Safety-State Key Laboratory Cultivation Base, Ministry of Science and Technology, Nanjing, 210014, China; Key Laboratory of Control Technology and Standard for Agro-product Safety and Quality, Ministry of Agriculture, PR China, Nanjing, 210014, China; Institute of Food Safety and Nutrition, Jiangsu Academy of Agricultural Sciences, Nanjing, 210014, China.

Journal of Environmental Management
|November 4, 2019
PubMed
Summary

A novel Bacillus siamensis (T7) microbe-biochar composite effectively remediates dibutyl phthalate (DBP) contaminated soils. This approach enhances DBP degradation, reduces plant uptake, and improves soil microbial community health.

Keywords:
Bacillus siamensis sp.BiocharBioremediationDibutyl phthalateImmobilization

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Area of Science:

  • Environmental Science
  • Microbiology
  • Soil Science

Background:

  • Dibutyl phthalate (DBP) is a prevalent agricultural soil contaminant with adverse environmental and health impacts.
  • Effective bioremediation strategies are crucial for mitigating DBP pollution in farmland.

Purpose of the Study:

  • To develop and evaluate a microbe-biochar composite for enhanced DBP biodegradation in contaminated agricultural soils.
  • To investigate the impact of the T7-biochar composite on soil prokaryotic communities and DBP degradation mechanisms.

Main Methods:

  • Immobilization of DBP-degrading Bacillus siamensis (T7) strain in rice husk-derived biochar.
  • Application of the T7-biochar composite to DBP-polluted soil for bioremediation.
  • Analysis of DBP degradation rates, half-life, and uptake by leafy vegetables.
  • Assessment of soil prokaryotic community structure and functional diversity.

Main Results:

  • The T7-biochar composite significantly increased the DBP degradation rate constant and reduced its half-life compared to controls.
  • The composite effectively reduced DBP uptake by leafy vegetables, improving crop safety.
  • Bioremediation using the T7-biochar alliance showed superior performance over pure T7 or biochar alone.
  • The composite promoted beneficial bacteria and enhanced soil prokaryotic functional diversity, potentially reversing DBP's negative effects.

Conclusions:

  • Rice husk-derived biochar serves as an effective immobilization matrix for functional microbes in environmental remediation.
  • The T7-biochar composite is a promising soil amendment for efficient DBP bioremediation and the production of DBP-free crops.