Monitoring of methylene blue monomers and dimers to control the bacterialogical water quality including application to photocatalysis
| Autor: | Latifa Bousselmi, Myriam Ben Said, Ahmed Ghrabi |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Biocide
biology Health Toxicology and Mutagenesis Dimer General Medicine 010501 environmental sciences biology.organism_classification Photochemistry 01 natural sciences Pollution Water Purification Methylene Blue Kinetics chemistry.chemical_compound Monomer chemistry Water Quality Photocatalysis Environmental Chemistry Water treatment Water quality Water Pollutants Chemical Methylene blue Bacteria 0105 earth and related environmental sciences |
| Zdroj: | Environmental Science and Pollution Research. 28:15819-15827 |
| ISSN: | 1614-7499 0944-1344 |
| DOI: | 10.1007/s11356-020-11767-z |
| Popis: | In this study, we propose the development of a rapid and reliable method to control and to monitor microbial water quality. The methylene blue (MB) decolorization assay was based on the analysis of spectral profiles of dye in interaction with a different bacterial concentration. The determination of dye decolorization rate (DDR) shows a correlation between the MB reduction rate and the bacterial density. Moreover, the kinetic of the monomer and dimer equilibrium of MB in water mainly, the monitoring of bounded MB species in relationship with a knowed concentration of target bacteria, was allowed to establish a relationship between MB decolorization rate and bacterial density. Furthermore, this method was applied to evaluate the water quality after photocatalysis. Based on this method, the photocatalytic effects on bacterial density was highlighted by the decrease in DDR after photocatalytic treatment with fractioned times (0 to 5 h); this increase was followed by a decrease of bounded MB species and, an increase in free MB forms miming the reduction of bacterial density due to the biocide effects of photocatalysis process. However, the analysis of spectra profiles shows a weak but a continuous decrease in bounded MB dimer and monomer forms in the treated water samples exempt of culturable bacteria. Moreover, the MB spectra profiles were tended toward a negative control spectrum without superposition. Thus, the possibility of the presence of viable but non-culturable bacteria was expected; therefore, to optimize this tertiary water treatment process, an extending on proceeding time was recommended to avoid the bacterial resuscitation after photocatalysis. |
| Databáze: | OpenAIRE |
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