Decomposition of Contaminants of Emerging Concern in Advanced Oxidation Processes

Kudlek, Edyta

doi:10.3390/ecws-2-04949

Cited by 10 publications

(6 citation statements)

References 38 publications

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“…Ozonation or degradation of pollutants via hydrogen peroxide are always accompanied by the addition of toxic and expensive oxidants. Also, AOPs generate several oxidation by-products with a high toxic potential [ 28 ]. Conventional treatment methods have many problems and drawbacks.…”

Section: Introductionmentioning

confidence: 99%

Enhanced Removal and Toxicity Decline of Diclofenac by Combining UVA Treatment and Adsorption of Photoproducts to Polyvinylidene Difluoride

et al. 2020

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The occurrence of micropollutants in the environment is an emerging issue. Diclofenac, a non-steroidal anti-inflammatory drug, is one of the most frequently detected pharmaceuticals in the environment worldwide. Diclofenac is transformed by UVA light into different products with higher toxicity. The absorbance of the transformation products overlaps with the absorbance of diclofenac itself and inhibits the ongoing photoreaction. By adding polyvinylidene difluoride (PVDF), the products adsorb to the surface of PVDF. Therefore, phototransformation of diclofenac and total organic carbon (TOC) removal is enhanced and the toxicity decreased. At 15 min and 18 h of UVA treatment, removal of diclofenac and TOC increases from 56% to 65% and 18% to 54%, respectively, when PVDF is present. The toxicity of a UVA treated (18 h) diclofenac solution doubles (from 5 to 10, expressed in toxicity units, TU), while no toxicity was detectable when PVDF is present during UVA treatment (TU = 0). PVDF does not need to be irradiated itself but must be present during photoreaction. The adsorbent can be reused by washing with water or ethanol. Diclofenac (25 mg L−1) UVA light irradiation was monitored with high performance liquid chromatography (HPLC), UV-Vis spectroscopy and by analysing the decrease of TOC. The toxicity towards Vibrio fischeri was examined according to DIN EN ISO 11348-1: 2009-05. Density functional theory (DFT) was used to simulate the phototransformation products known in literature as well as further products identified via gas chromatography–mass spectrometry (GC-MS). The absorption spectra, reaction enthalpies (ΔH) and Gibbs free energy of reactions (ΔG) were calculated. The combination of UVA irradiation of diclofenac with adsorption of photoproducts to PVDF is unique and opens up new possibilities to enhance removal of pollutants from water.

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Section: Introductionmentioning

confidence: 99%

Enhanced Removal and Toxicity Decline of Diclofenac by Combining UVA Treatment and Adsorption of Photoproducts to Polyvinylidene Difluoride

et al. 2020

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“…2a). This pharmaceutical compound is relative by hardly degradable also in other oxidation processes like H 2 O 2 , O 3 or UV/TiO 2 [15]. 60 min of the UV/TiO 2 process of deionized water containing CAF in a concentration of 1mg/L allowed only for a 3% decrease in the compound concentration.…”

Section: Resultsmentioning

confidence: 99%

Impact of the UV Lamp Power on the Formation of Swimming pool Water Treatment By-Products

Kudlek

Lempart

Dudziak

et al. 2018

Architecture, Civil Engineering, Environment

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The operation of swimming pools requires a constant monitoring of water quality parameters and protection of water against pathogens. This is implemented by various disinfection methods, among which the most commonly used are based on chlorine action supported by ozone or UV irradiation. The paper presents the comparison of the effectives of organic micropollutants decomposition occurring in swimming pool water during UV irradiation emitted by a 15 and 150 W UV lamp. The tests were conducted on real swimming pool water collected from a sport basin. The identification and the determination of micropollutants concentration were performed by the use of gas chromatography GC-MS (EI) preceded by solid-phase extraction SPE. It was shown that the concentration of micropollutants decreases with the increase in the irradiation time of pool water. The 150 W UV lamp allowed for an over 33% removal of micropollutants from the group of pharmaceuticals compounds (except for caffeine) and more than 76% decrease of other compounds, which belong to the group of personal care products additives, food additives and phthalates. In addition, it has been demonstrated that during the irradiation of such complex water matrixes as swimming pool water, a significant number of micropollutants degradation by-products were formed, which are not found in water before UV irradiation.

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“…UV light can lead to the decomposition of micropollutants and the formation of several decomposition by-product [14]. Those product can raise the toxic nature of micropollutant water solutions [7]. The results obtained during the Microtox ® test (5 min of expousure) for water mixture containing all micropollutants with the concentration of 1 mg/L (of each component) are presented in Figure 4.…”

Section: Resultsmentioning

confidence: 99%

“…Diversified impact of micropollutants on several indicator organisms makes it difficult to determine safe concentrations of those chemicals that do not cause adverse changes in the entire ecosystem. Hardly biodegradable compounds often require the use of advanced methods for their decomposition, which can enhance the water toxicity [6,7].…”

Section: Introductionmentioning

confidence: 99%

Toxicological analysis of water mixtures of organic micropollutants subjected to UV irradiation

Kudlek

2018

E3S Web Conf.

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Abstract. The paper presents the toxicological analysis of water solutions of micropollutants from different groups i.e. industrial additives, pharmaceutical compounds, hormones, UV blockers and pesticides before and after their exposure to UV light. The toxicological response of both Microtox ® and Daphtoxkit F ® test, increased with the increase of the compound concentration. Triclosan water solution was considered as the most toxic. The lowest toxic effect was observed for Imidacloprid and Octyl-methoxycinnamate solutions. The exposure of Benzocaine, Octyl-methoxycinnamate and Triclosan water solutions to UV light led to an increase of their toxicity. An inverse relationship was observed for Imidacloprid and 17α-Ethinylestradiol solutions.

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Decomposition of Contaminants of Emerging Concern in Advanced Oxidation Processes

Cited by 10 publications

References 38 publications

Enhanced Removal and Toxicity Decline of Diclofenac by Combining UVA Treatment and Adsorption of Photoproducts to Polyvinylidene Difluoride

Enhanced Removal and Toxicity Decline of Diclofenac by Combining UVA Treatment and Adsorption of Photoproducts to Polyvinylidene Difluoride

Impact of the UV Lamp Power on the Formation of Swimming pool Water Treatment By-Products

Toxicological analysis of water mixtures of organic micropollutants subjected to UV irradiation

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