H2O2/UV-Coxidation of potential endocrine disrupting compounds: a case study with dimethyl phthalate

Abstract

This paper discusses the feasibility of the ultraviolet radiation-hydrogen peroxide (H(2)O(2)/UV-C) process as an advanced oxidation process (AOP) in the treatment of endocrine disrupting compounds (EDC). Dimethyl phthalate (DMP) was chosen as the model compound owing to its classification as an EDC. Experiments have been conducted at various pH values (3.5, 6.0 and 9.0) and initial H(2)O(2) concentrations (0-60 mM) in a batch reactor equipped with a low-pressure mercury UV-C lamp in order to evaluate the optimal operation conditions of the H(2)O(2)/UV-C process. The most effective pH value for the degradation of DMP by H(2)O(2)/UV-C treatment was found as 6.0. DMP abatement increased with increasing H(2)O(2) concentrations from 5 to 30 mM. Further increase in initial H(2)O(2) concentration, however, reduced both the rate and extent of DMP removal as well as chemical oxygen demand (COD) and total organic carbon (TOC) removals. A simple kinetic model was proposed for DMP, COD and TOC abatements confirmed pseudo-first-order reaction. The electrical energy per order (EE/O) values for DMP oxidation and TOC mineralization were calculated as 3.3 and 19 kWh m(-3) order(-1) respectively for the optimum treatment conditions (H(2)O(2,o) = 30 mM, pH(o) = 6.0, DMP(o)= 100 mg L(-1)). Inhibition of oxygen uptake rate by activated sludge (ISO 8192) was evaluated as a tool for assessing the acute toxicity of untreated and H(2)O(2)/UV-C treated DMP. According to the results obtained in this work, the use of the H(2)O(2)/UV-C process is recommended to achieve a complete DMP oxidation and high mineralization degree of aqueous solution of DMP.

The methods of identification, analysis, and removal of endocrine disrupting compounds (EDCs) in water

“…The compounds, which were lacking in aromatic moieties, such as atrazine, meprobamate, and tri(2-chloroethyl)phosphate (TCEP), presented oxidative removal efficiencies of less than 60% by ozonation, and, subsequently, less than 5% of TCEP was removed [115]. The applicability of other AOP processes, such as photo-oxidation with UV light, ultrasonic cavitation, Fenton oxidation, and ozonation with hydrogen peroxide generation, had been also examined by using BPA as an EDC [115,[146][147][148]. The overall BPA oxidation rate was quite high in most AOP applications, and the pH value was found to be an important factor in controlling the removal efficiency.…”

“…A proposed breakdown mechanism was as follows: the generation of hydroxyl radicals and the destruction of the aromatic structure of BPA under their attack. The application of UV radiation-hydrogen peroxide (H 2 O 2 /UV-C) process for the removal of dimethyl phthalate (DMP) had achieved a high degree of DMP mineralization in aqueous solutions [148].…”

Treatment of phthalic acid esters by electrocoagulation with stainless steel electrodes using dimethyl phthalate as a model compound

“…Almost complete oxidation of DEP was realized in their work. Ölmez-Hanci et al [10] also investigated the treatability of DMP with the H 2 O 2 /UV-C advanced oxidation and reported complete DMP oxidation together with a high degree of mineralization. Fenton and photo-Fenton processes were also studied for the oxidation of DMP and removal efficiencies up to 80% were obtained in this study [11].…”

Biological Feature Selection and Disease Gene Identification using New Stepwise Random Forests

“…Type I diabetes are affected by β-cell death (Tew et al, 2007). For GO 0015975 (energy deriva- March 2017, pp.64-79, © 2017 tion by oxidation of reduced inorganic compounds), endocrine diseases are related to oxidation of compounds (Olmez-Hanci et al, 2009). GO 0043067 (regulation of programmed cell death) regulates programmed cell death which affects endocrine-dependent tissues (Martimbeau and Tilly, 1997).…”