Synergistic transformation of Cr(VI) in lubricant degradation by bacterial consortium
Abstract
In recent years, it has become widely acknowledged that heavy metals are often present in oil-contaminated sites. This study utilized three specific types of microorganisms with different functions to construct a composite bacterial consortium for treating lubricant-Cr(VI) composite pollutants. The selected strains were Lysinbacillus fusiformis and Bacillus tropicus. The Back Propagation Neural Network-genetic algorithm was employed to optimize the secondary bacterial addition time to 67 h and the strain ratio to 2:1. The optimized process involved the use of 4.6 g/L glucose and ammonium oxalate as electron donors. After 6 days of treatment with the composite consortium, the removal rates of 1500 mg/L lubricating oil and 50 mg/L chromium reached 90.3% and 84.2%, respectively. Initial analysis using three-dimensional fluorescence to examine the changes in extracellular polymers in the bacteria when exposed to chromium-lubricating oil, showed that 30 mg/L Cr(VI) could induce the secretion of extracellular protein-like substances. These substances may be directly or indirectly involved in the biological detoxification mechanism of chromium. The synergistic removal of complex pollutants has the potential to transform previous "unilateral" removal studies and enhance bioremediation efficiency.
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The bacterial response to chromium exposure induced the secretion of extracellular protein-like substances, aiding in metal detoxification and organic pollutant degradation.
“The bacterial response to chromium exposure induced the secretion of extracellular protein-like substances, aiding in metal detoxification and organic pollutant degradation [151,153].”
From Harnessing bacterial consortia for effective bioremediation: targeted removal of heavy metals, hydrocarbons, and persistent pollutants (2025) · cites this paper as [151]
A consortium of Lysinbacillus fusiformis and Bacillus tropicus successfully removed 90.3% of lubricating oil and 84.2% of Cr(VI) within 6 days.
“A consortium of Lysinbacillus fusiformis and Bacillus tropicus successfully removed 90.3% of lubricating oil and 84.2% of Cr(VI) within 6 days.”
From Harnessing bacterial consortia for effective bioremediation: targeted removal of heavy metals, hydrocarbons, and persistent pollutants (2025) · cites this paper as [151]
Rhodococcus ruber Y14 completely degraded multiple pyrethroid insecticides including D-cyphenothrin, allethrin, fenvalerate, tetramethrin, and prallethrin.
“This strain was able to completely degrade multiple pyrethroid insecticides, including D-cyphenothrin, allethrin, fenvalerate, tetramethrin, and prallethrin”
From Harnessing bacterial consortia for effective bioremediation: targeted removal of heavy metals, hydrocarbons, and persistent pollutants (2025) · cites this paper as [151]
Rhodococcus ruber Y14 is an efficient degrader of pyrethroid pesticides.
“Rhodococcus ruber Y14 has been identified as an efficient degrader.”
From Harnessing bacterial consortia for effective bioremediation: targeted removal of heavy metals, hydrocarbons, and persistent pollutants (2025) · cites this paper as [151]
Rhodococcus ruber Y14 has potential for large-scale bioremediation applications.
“highlighting its potential for large-scale bioremediation applications [151,153].”
From Harnessing bacterial consortia for effective bioremediation: targeted removal of heavy metals, hydrocarbons, and persistent pollutants (2025) · cites this paper as [151]
Rhodococcus ruber Y14 removed over 80% of D-cyphenothrin from soil within 25 days through carboxyl bond hydrolysis.
“This strain removed over 80% of D-cyphenothrin from soil within 25 days through carboxyl bond hydrolysis.”
From Harnessing bacterial consortia for effective bioremediation: targeted removal of heavy metals, hydrocarbons, and persistent pollutants (2025) · cites this paper as [151]
Cited by
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Qattan, S. Y. A. (2025) · Environmental Sciences Europe · doi:10.1186/s12302-025-01103-y · Cited by 109 · see citing works
- Authors
- Huang, D., Jiang, Y., Zhao, K., Qin, F., Yuan, Y., Xia, B., & Jiang, G.
- Affiliations
- Chongqing Technology and Business University (CN)
- North China Institute of Science and Technology (CN)
- Corresponding author
- Jiang, Yan
- Venue
- World Journal of Microbiology and Biotechnology
- Published
- 2025-01-09
- Volume
- 41
- Issue
- 2
- Pages
- 27-27
- ISSN
- 0959-3993 (ISSN-L)
- 1573-0972
- OpenAlex
- W4406161728
- Cited by
- 4
- References
- 0
- Citations by year
- 2026: 2 · 2025: 2
- FWCI
- 1.69
- Type
- journal article
- Language
- en
- Open access
- closed
- Licence
- Locations
- World Journal of Microbiology and Biotechnology (publishedVersion)
- PubMed (publishedVersion)
- Funders
- Science and Technology Research Program of Chongqing Education Commission (KJQN202200840)
- Natural Science Foundation of Chongqing (cstc2021jcyj-msxmX0765)
- National Natural Science Foundation of China (21376285)
- Chongqing graduate research innovation project (yjscxx2024-284-122)
- Topics
- Physical Sciences › Environmental Science › Health, Toxicology and Mutagenesis › Chromium effects and bioremediation
- Physical Sciences › Environmental Science › Pollution › Microbial bioremediation and biosurfactants
- Physical Sciences › Environmental Science › Water Science and Technology › Heavy Metal Pollution Remediation
- Keywords
- hexavalent chromium, lubricant degradation, Bacillus tropicus, bioremediation, synergistic pollutant removal, extracellular polymeric substances, petroleum-contaminated sites, electron donors
- MeSH terms
- Bacillaceae, Bacillus, Biodegradation, Environmental, Chromium, Glucose, Lubricants, Microbial Consortia
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