Bioremediation of Copper with Endophytic Bacteria Bacillus sp. and Streptomyces griseus

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Böke Özkoç H. S., Aliustaoǧlu M. T., Şentürk İ.

Journal of Environmental Engineering (United States), vol.149, no.11, 2023 (SCI-Expanded) identifier

  • Publication Type: Article / Article
  • Volume: 149 Issue: 11
  • Publication Date: 2023
  • Doi Number: 10.1061/joeedu.eeeng-7397
  • Journal Name: Journal of Environmental Engineering (United States)
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, Aerospace Database, Applied Science & Technology Source, Aqualine, Aquatic Science & Fisheries Abstracts (ASFA), Biotechnology Research Abstracts, Business Source Elite, Business Source Premier, CAB Abstracts, Chemical Abstracts Core, Chimica, Communication Abstracts, Compendex, Computer & Applied Sciences, Environment Index, Geobase, Greenfile, INSPEC, Metadex, Pollution Abstracts, Veterinary Science Database, DIALNET, Civil Engineering Abstracts
  • Keywords: Bioaccumulation, Biosorption, Copper, Endophytic bacteria, Metal tolerance, Nature-based solutions
  • Ondokuz Mayıs University Affiliated: Yes

Abstract

The present study investigated the copper tolerance and bioremediation potential of endophytic bacteria because endophytic bacteria are the most common bacterial strains associated with heavy metal bioremediation. The acute toxic effects of copper on living organisms were determined using two endophytic bacterial species, Bacillus sp. and Streptomyces griseus (S. griseus). After 4 days of acute toxicity test, changes in metal and bacteria concentrations in water, inhibition (%), bioaccumulation rate, and bioconcentration factors were evaluated. According to the evaluations, cell weights decreased, and inhibition rate (%) increased with increasing metal concentration after a certain level (10 mg/L Cu). With increasing metal concentrations from 5 to 25 mg/L, biosorption efficiency decreased from 35.94% to 20.73% for S. griseus and from 56.36% to 34.47% for Bacillus sp. The bioaccumulation quantities increased with increasing metal concentrations for both species. Based on the present findings, it is concluded that Bacillus sp. and S. griseus are suitable candidates for the bioremediation of copper ions from contaminated environments. These endophytic bacteria use hyperaccumulating plants for more effective bioremediation of heavy metals.