RESEARCH PAPER
Detection and characteristics
of sulfamethoxazole-resistant bacteria
in constructed wetlands treating
sulfamethoxazole-rich wastewater
1
The Silesian University of Technology, Environmental Biotechnology Department, Gliwice, Poland
Submission date: 2016-07-13
Final revision date: 2016-11-18
Acceptance date: 2016-12-14
Publication date: 2017-05-25
BioTechnologia 2017;98(1):15-23
KEYWORDS
biochemical characterization of SMX-resistant bacterialab-scale constructed wetlandsPCR-DGGEsulfamethoxazole-resistant bacteria
TOPICS
ABSTRACT
Constructed wetlands (CW) are one of the biological wastewater treatment systems that reflect the natural processes occurring in swamps. Constructed wetlands use microbiological and physico-chemical processes as well as plant metabolism in order to purify wastewater. In such treatment systems, the role of microorganisms is crucial. In this experiment, synthetic communal wastewater containing sulfamethoxazole (SMX; chemotherapeutic) at a concentration of 5 mg/l was applied in the CW systems, both unplanted and planted with Phalaris arundinacea , also known as reed canary grass. Fourteen Gram-positive SMX-resistant bacteria strains were isolated from the CW column fillings and the plant rhizosphere. All of these were identified as representatives of Bacillus sp. based on 16S rRNA sequencing. Despite this molecular identification, the isolates differed significantly in their biochemical features. All 14 isolates presented resistance toward sulfamethoxazole and all 14 strains possessed a sul1 gene, while only 4 gave positive results in sul2 and 3 in sul3 PCR tests. None of the isolated strains possessed all three sul genes. A PCR-DGGE based analysis of the presence of SMX-resistant bacteria in the CW community was undertaken. It was found that none of the isolates represented the dominant genotype in the bacterial community.
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| eISSN: | 2353-9461 |
| ISSN: | 0860-7796 |
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