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Microbiology and Biotechnology Letters

Research Article(보문)

Environmental Microbiology  |  Biodegradation and Bioremediation

Microbiol. Biotechnol. Lett.

Received: July 7, 2024; Revised: October 6, 2024

Cadmium resistance and bioremediation potential of bacteria isolated from hospital wastewater samples of Bangladesh

Taslin Jahan Mou 1, 2, 1*, Rahat Ara Mun 1, Farhana Haque 1, Nadim Sharif 1, Abdul Kadir Ibne Kamal 3, Md. Fokhrul Islam 2, 4, 4, Md. Shahedur Rahman 5, Shuvra Kanti Dey 1 and Anowar Khasru Parvez 1*

1Department of Microbiology, Jahangirnagar University, Savar, Dhaka-1342, Bangladesh, 2Institute of Quantitative Biology, Biochemistry and Biotechnology, School of Biological Sciences, The University of Edinburgh , United Kingdom-EH9 3FF, 3Department of Environmental Sciences, Jahangirnagar University, Savar, Dhaka-1342, Bangladesh, 4Department of Pharmacy, Jahangirnagar University, Savar, Dhaka-1342, Bangladesh, 5Department of Genetic Engineering and Biotechnology, Jashore University of Science and Technology, Jashore-7408, Bangladesh

Correspondence to :
Taslin Jahan Mou, Department Of Microbiology [1342]
Fax : +8801717562770,+8801737540940, E-mail : moumicro@juniv.edu

Abstract

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Cadmium (Cd) pollution has turned into an emerging environmental issue that should be given attention because of its high stability and toxicity . This study aimed to explore the Cd pollution scenario in Hospital wastewater (HWW) of Bangladesh and to screen out potential Cd-resistant bacteria for their possible application in cadmium bioremediation. The Cd concentration of the Hospital wastewater samples (HWW, n=7) was determined in a range of 0.6624-5.0482 mg/L, which exceeds the acceptable standard limit in the environment. Moreover, 93 Cd-resistant bacteria were isolated, among which 88.1 % (n=82) were gram negative whereas 11.82% (n=11) were gram positive. 86% (n=80) of the Cd-resistant isolates was observed with co-resistance against three other metals- zinc, cobalt, and nickel. Polymerase chain reaction detected the presence of cadmium resistant genetic determinant (czc gene) in 34.4 % (n=32) of the isolates. Cd-resistant isolates were distributed into 13 major genotypic groups according to Randomly Amplified Polymorphic DNA (RAPD) analysis. Genotypically diverse groups of bacterial genera belonged to Proteus, Pseudomonas, and Providencia were identified in the phylogenetic analysis using partial 16S rRNA gene sequence . 13.9 % (n=13) of the Cd-resistant isolates were noted to have high tolerance level for cadmium and the potential for Cd removal in range of (10-90%). Higher potential (70-90%) of Cd removal was determined for Proteus sp and Pseudomonas sp in the laboratory testing. The Cd removal capacity of these native isolates could be exploited for its prospective application in the bioremediation of Cd from contaminated environmental sites in Bangladesh.

Keywords: Cadmium pollution, Hospital wastewater, Bioremediation, Pseudomonas, Proteus

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