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Biofouling
The Journal of Bioadhesion and Biofilm Research
Volume 35, 2019 - Issue 4
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Original Articles

Ecological role of Acinetobacter calcoaceticus GSN3 in natural biofilm formation and its advantages in bioremediation

Sahar IrankhahDepartment of Microbiology, Faculty of Biological Sciences, Alzahra University, Tehran, Iran; ;Global Centre for Environmental Remediation (GCER), Faculty of Science and Information Technology, University of Newcastle, Callaghan, NSW, Australia;
,
Ahya Abdi AliDepartment of Microbiology, Faculty of Biological Sciences, Alzahra University, Tehran, Iran; Correspondence[email protected]
,
Megharaj MallavarapuGlobal Centre for Environmental Remediation (GCER), Faculty of Science and Information Technology, University of Newcastle, Callaghan, NSW, Australia; ;CRC CARE, Newcastle University LPO, Callaghan, NSW, Australia; ORCID Iconhttp://orcid.org/0000-0002-6230-518X
ORCID Icon,
Mohammad Reza SoudiDepartment of Microbiology, Faculty of Biological Sciences, Alzahra University, Tehran, Iran;
,
Suresh SubashchandraboseGlobal Centre for Environmental Remediation (GCER), Faculty of Science and Information Technology, University of Newcastle, Callaghan, NSW, Australia; ;CRC CARE, Newcastle University LPO, Callaghan, NSW, Australia;
,
Sara GharaviDepartment of Biotechnology, Faculty of Biological Sciences, Alzahra University, Tehran, Iran;
&
Bita AyatiEnvironmental Engineering Division, Civil and Environmental Engineering Faculty, Tarbiat Modares University, Tehran, IranORCID Iconhttp://orcid.org/0000-0001-7720-9863
ORCID Icon show all
Pages 377-391 | Received 03 Nov 2018, Accepted 12 Mar 2019, Published online: 23 May 2019
 
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Abstract

This study assessed the role of a new Acinetobacter calcoaceticus strain, GSN3, with biofilm-forming and phenol-degrading abilities. Three biofilm reactors were spiked with activated sludge (R1), green fluorescent plasmid (GFP) tagged GSN3 (R2), and their combination (R3). More than 99% phenol removal was achieved during four weeks in R3 while this efficiency was reached after two and four further operational weeks in R2 and R1, respectively. Confocal scanning electron microscopy revealed that GSN3-gfp strains appeared mostly in the deeper layers of the biofilm in R3. After four weeks, almost 7.07 × 107 more attached sludge cells were counted per carrier in R3 in comparison to R1. Additionally, the higher numbers of GSN3-gfp in R2 were unable to increase the efficiency as much as measured in R3. The presence of GSN3-gfp in R3 conveyed advantages, including enhancement of cell immobilization, population diversity, metabolic cooperation and ultimately treatment efficiency.

Acknowledgements

This work was partially supported by the Iranian National Science Foundation [96001722].

Disclosure statement

The authors declare no conflict of interest.

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