Enhanced triclosan biodegradation by a biphasic bioreactor
Triclosan (TCS), an antiseptic agent that facilitates the formation of microbial resistances, has been widely used and is therefore ubiquitously detectable in wastewater. However, structure and low water solubility limit both microbial transformation kinetic and removal efficiency of TCS. Therefore,...
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| Format: | Article |
| Language: | English |
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Elsevier
2023-03-01
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| Series: | Chemical Engineering Journal Advances |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2666821122001892 |
| _version_ | 1797956167196999680 |
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| author | Yen Lin Leong Martina Kiel Armando González-Sánchez Karl-Heinrich Engesser Daniel Dobslaw |
| author_facet | Yen Lin Leong Martina Kiel Armando González-Sánchez Karl-Heinrich Engesser Daniel Dobslaw |
| author_sort | Yen Lin Leong |
| collection | DOAJ |
| description | Triclosan (TCS), an antiseptic agent that facilitates the formation of microbial resistances, has been widely used and is therefore ubiquitously detectable in wastewater. However, structure and low water solubility limit both microbial transformation kinetic and removal efficiency of TCS. Therefore, the use of solubilizers or non-aqueous phases (NAP) appears to be a suitable approach for rapid, complete, and cost-effective treatment of highly contaminated TCS point sources such as sports clubs, hospitals, industrial wastewater treatment plants or synthesis effluents without dilution effects.The mixed culture TCSmix100 previously isolated and characterized, and able to completely mineralize TCS at stoichiometric chloride release, was investigated in presence or absence of solubilizers in lab-scale well stirred batch reactors. While TCS conversion was limited in solubilizer-free tests due to limited solubility of TCS crystals within the aqueous phase, solubilizers enhanced water solubility, mass transport and microbial kinetics. Thus, TCS transformation rate at initial 1.45 g TCS L−1 was further increased from a high level of 155–172 mg L−1 d−1 without solubilizers to 399 mg L−1 d−1 or to 888 mg L−1 d-1 providing β-pinene or α-pinene as NAPs, i.e., by a factor of 2.3–5.2, exceeding kinetic parameters of other strains described in literature by at least two orders of magnitude. These results clearly demonstrate the high TCS mineralization capacity of this biphasic treatment technologies and its applicability in treatment of highly contaminated TCS point-sources to eliminate recalcitrant contaminants at high levels before getting diluted. |
| first_indexed | 2024-04-10T23:45:49Z |
| format | Article |
| id | doaj.art-5b6c542f9a3e46c5adf85fd9ac88ad0d |
| institution | Directory Open Access Journal |
| issn | 2666-8211 |
| language | English |
| last_indexed | 2024-04-10T23:45:49Z |
| publishDate | 2023-03-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Chemical Engineering Journal Advances |
| spelling | doaj.art-5b6c542f9a3e46c5adf85fd9ac88ad0d2023-01-11T04:30:21ZengElsevierChemical Engineering Journal Advances2666-82112023-03-0113100429Enhanced triclosan biodegradation by a biphasic bioreactorYen Lin Leong0Martina Kiel1Armando González-Sánchez2Karl-Heinrich Engesser3Daniel Dobslaw4Institute of Sanitary Engineering, Water Quality and Solid Waste Management, University of Stuttgart, Stuttgart, D-70569, GermanyInstitute of Sanitary Engineering, Water Quality and Solid Waste Management, University of Stuttgart, Stuttgart, D-70569, GermanyInstitute of Sanitary Engineering, Water Quality and Solid Waste Management, University of Stuttgart, Stuttgart, D-70569, Germany; Institute of Engineering, Universidad Nacional Autónoma de México (UNAM), Circuito Escolar, Ciudad Universitaria, Mexico City, 04510, MexicoInstitute of Sanitary Engineering, Water Quality and Solid Waste Management, University of Stuttgart, Stuttgart, D-70569, GermanyInstitute of Sanitary Engineering, Water Quality and Solid Waste Management, University of Stuttgart, Stuttgart, D-70569, Germany; Corresponding author at: Department of Biological Waste Air Purification, Institute of Sanitary Engineering, Water Quality and Solid Waste Management, University of Stuttgart, Bandtäle 2, Stuttgart, D-70569, Germany.Triclosan (TCS), an antiseptic agent that facilitates the formation of microbial resistances, has been widely used and is therefore ubiquitously detectable in wastewater. However, structure and low water solubility limit both microbial transformation kinetic and removal efficiency of TCS. Therefore, the use of solubilizers or non-aqueous phases (NAP) appears to be a suitable approach for rapid, complete, and cost-effective treatment of highly contaminated TCS point sources such as sports clubs, hospitals, industrial wastewater treatment plants or synthesis effluents without dilution effects.The mixed culture TCSmix100 previously isolated and characterized, and able to completely mineralize TCS at stoichiometric chloride release, was investigated in presence or absence of solubilizers in lab-scale well stirred batch reactors. While TCS conversion was limited in solubilizer-free tests due to limited solubility of TCS crystals within the aqueous phase, solubilizers enhanced water solubility, mass transport and microbial kinetics. Thus, TCS transformation rate at initial 1.45 g TCS L−1 was further increased from a high level of 155–172 mg L−1 d−1 without solubilizers to 399 mg L−1 d−1 or to 888 mg L−1 d-1 providing β-pinene or α-pinene as NAPs, i.e., by a factor of 2.3–5.2, exceeding kinetic parameters of other strains described in literature by at least two orders of magnitude. These results clearly demonstrate the high TCS mineralization capacity of this biphasic treatment technologies and its applicability in treatment of highly contaminated TCS point-sources to eliminate recalcitrant contaminants at high levels before getting diluted.http://www.sciencedirect.com/science/article/pii/S2666821122001892TriclosanEliminationMicropollutantsBiodegradationMineralizationPinene |
| spellingShingle | Yen Lin Leong Martina Kiel Armando González-Sánchez Karl-Heinrich Engesser Daniel Dobslaw Enhanced triclosan biodegradation by a biphasic bioreactor Chemical Engineering Journal Advances Triclosan Elimination Micropollutants Biodegradation Mineralization Pinene |
| title | Enhanced triclosan biodegradation by a biphasic bioreactor |
| title_full | Enhanced triclosan biodegradation by a biphasic bioreactor |
| title_fullStr | Enhanced triclosan biodegradation by a biphasic bioreactor |
| title_full_unstemmed | Enhanced triclosan biodegradation by a biphasic bioreactor |
| title_short | Enhanced triclosan biodegradation by a biphasic bioreactor |
| title_sort | enhanced triclosan biodegradation by a biphasic bioreactor |
| topic | Triclosan Elimination Micropollutants Biodegradation Mineralization Pinene |
| url | http://www.sciencedirect.com/science/article/pii/S2666821122001892 |
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