Martínez-Hernández, V. and Meffe, R. and Herrera, S. and De Bustamante, I. (2016) The role of sorption and biodegradation in the removal of acetaminophen, carbamazepine, caffeine, naproxen and sulfamethoxazole during soil contact: A kinetics study. Science of The Total Environment, 559. pp. 232-241. ISSN 00489697
Full text not available from this repository.Abstract
In countries like Spain, where water is a limited resource, reusing effluents from wastewater treatment plants may imply the introduction of incompletely eliminated pollutants into the environment. Therefore, this work identified the role of sorption and biodegradation in attenuating pharmaceutical compounds (acetaminophen, carbamazepine, caffeine, naproxen and sulfamethoxazole) in natural soil. It also determined which sorption and removal (“sorption + biodegradation”) kinetics models describe the behaviour of these substances in the water-soil system. Presence of potential transformation products (TPs) as a result of pharmaceuticals biodegradation was also studied. To this end, serial batch-type experimentswere performedwith a soil:water ratio of 1:4 and an initial pharmaceutical concentration of 100 μg L−1. Despite results are dependent on soil characteristics, they revealed that, for those substances with a higher affinity to the soil used (loamy sand), sorption seems to play a key role during the first 48 h of contactwith soil, and gives way to biodegradation afterwards. The sorption of the pharmaceuticals studied follows a pseudo second-order kinetics. Caffeine and sulfamethoxazole displayed the fastest initial sorption velocities (h=2055 and h=228 μg kg−1 h−1, respectively). The removal kinetics experiments, satisfactorily simulated by the first-order kinetics model, indicated the presence of potential microbial adaptation to degradation. Indeed, half-lives decreased from 1.6- to 11.7-fold with respect to initial values. The microbial capacity to degrade sulfamethoxazole could be a matter of concern if bacteria have developed resistance to this antibiotic. Caffeine, acetaminophen and sulfamethoxazole were mitigated to a greater extent, whereas the removal of naproxen and carbamazepine was more limited. The appearance of epoxycarbamazepine andN4-acetyl-sulfamethoxazole as possible TPs of carbamazepine and sulfamethoxazole, respectively, indicated that biodegradationwas incomplete and showed the capacity of soil microbes to transform these substances.
| Item Type: | Article |
|---|---|
| Subjects: | Q Science > Q Science (General) Q Science > QD Chemistry Q Science > QE Geology Q Science > QR Microbiology |
| Depositing User: | Mª Virtudes Martínez Hernández |
| Date Deposited: | 22 Apr 2016 07:36 |
| Last Modified: | 09 May 2016 15:46 |
| URI: | http://eprints.imdea-agua.org:13000/id/eprint/607 |
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