Performance of the Persulfate/UV-C Process for the Treatment of Dimethyl Phthalate from Aquatic Environments
Phthalate esters (PAEs) are used as plasticizers to impart flexibility and resilience to plastic products. In recent years, PAEs are a controversial issue because many phthalates are suspected to be mutagens, hepatotoxic agents and endocrine disruptors, and can lead to adverse effects on organisms...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
| Published: |
IJEGEO
2018-08-01
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| Series: | International Journal of Environment and Geoinformatics |
| Subjects: | |
| Online Access: | http://dergipark.gov.tr/download/article-file/504737 |
| Summary: | Phthalate esters (PAEs) are used as plasticizers to impart flexibility and resilience to plastic products. In recent
years, PAEs are a controversial issue because many phthalates are suspected to be mutagens, hepatotoxic agents
and endocrine disruptors, and can lead to adverse effects on organisms even in a low concentration. Recently,
sulfate (SO4
-
) radical based advanced oxidation processes have attracted great scientific interest due to their high
efficiency in the degradation and mineralization of recalcitrant and/or toxic organic pollutants. In the present study
aqueous dimethyl phthalate (DMP; 100 mg L-1), being selected as a model PAE, was treated by the persulfate
(PS)/UV-C process at pH 3 and varying PS concentrations (0-60 mM). DMP and TOC abatements increased with
increasing PS concentrations from 5 to 40 mM. Further increase in the initial PS concentration, however, reduced
both the rate and extent of DMP and TOC removals. The highest pseudo-first-order abatement rate coefficient and
electrical energy per order (EE/O) values obtained for DMP treatment with PS/UV-C oxidation were found as
0.4493 min-1 and 1.79 kWh m-3 order-1, respectively, for PS = 30 mM, pH = 3, DMP = 100 mg L-1. The secondorder
reaction rate coefficient for DMP with SO4
-
was determined as 1.47×109
M-1s
-1 by the application of
competition kinetics using phenol as the probe compound. Within the scope of the present study, aqueous DMP
was also subjected to peroxymonosulfate (PMS)/UV-C and hydrogen peroxide (HP)/UV-C treatments. The
performance of PS/UV-C treatment was found to be higher than that of PMS/UV-C and HP/UV-C treatments both
in terms of DMP and TOC abatement rates at an initial oxidant concentration of 5 mM. |
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| ISSN: | 2148-9173 2148-9173 |