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Abstract

Many of the drugs used arc not completely metabolized in the human body and with urine and faces arc introduced into the sewage system. Finally, due to their incomplete removal during the conventional wastewater treatment process (CWTP), they can be released into the receiving water. One of the medicaments frequently detected in surface water is diclolcnac. The present study addresses the problem of diclofcnac removal in various aquatic samples using advanced oxidation processes (AOPs). The experiments were performed in distilled water and in biologically treated wastewater. The following AO Ps were applied: Fenlon 's reagent, UVand UV/H2O2-processes. The concentration of diclolcnac in distilled water corresponded to the concentration of this drug in human urine (ca. 20 mg-dm'). The real wastewater samples contained diclofcnac concentrations ranging from 630 to 790 ng-dm-'. The photodcgradation of diclolcnac was carried out in the photorcactor with a medium pressure Hg-vapor lamp (400 W). In the Fcnton's reaction different molar ratiosof H2O2/Fc'' were used. The diclotcnac mineralization (TOC removal) strictly depended on the amount of 1-1,0, applied in the Fcnton's reaction. Diclofcnac was rapidly degraded by direct photolysis (UV) and in UV/H2O2,-process both in distilled water and in wastewater samples. The results proved that the advanced oxidation processes arc cflcctive in diclofcnac removal from aquatic samples. The pseudo first order rate constants It)!' diclolcnac photodcgradation were determined.
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Authors and Affiliations

Ewa Felis
Jarosław Wiszniowski
Korneliusz Miksch
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Abstract

This article describes monitoring results of raw wastewater from one Polish municipal wastewater treatment plant (WWTP). The residues of 30 pharmaceutics belonging to particular drugs classes such as contrast media. antibiotics, lipids regulators, antiphologisties, psychiatric and anticpilcptic agents, drug's metabolites and 2 musk compounds have been investigated. The investigation showed occurrence of 20 out of 32 selected compounds above their limit of detection. Iopromide, a compound belonging to contrast media, was noticed at the highest concentration. The concentration of this compound in WWTP-influent was equaled to 27.0 μg/dm3• Other drugs, such as, like iopamidol, iomeprol, diatrizoat, iohexol, sulfomethoxazole, carbamazepine, ibuprofen, ibuprofen-OH, naproxen, diclofenac, bczafibrate, ketoprofen, and musk compound - galaxolide were detected at maximum concentration between I .O μg/dm3 (bezafibratc) and 13.0 μg/dm3 (iomcprol). The acidic compounds such as gemfibrozil and indomethacin were determined above their limit of detection, with concentration up to 0.22 μg/dm3 and 0.42 ug/dm', respectively. Based on the literature data, the above-mentioned drugs arc not completely removed from sewage during treatment processes and with effluent from WWTP they are introduced to receiving waters. Due to their chemical properties, residues of pharmaceutics may persist in the environment and the present knowledge about their ccotoxicological effects is insufficient.
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Authors and Affiliations

Ewa Felis
Korneliusz Miksch
Joanna Surmacz-Górska
Thomas Ternes
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Abstract

The polycyclic musk fragrances AHTN (Tonalide) and HHCB (Galaxolide) are the most common components of cosmetics and detergents. Use of AHTN and HHCB per year (in the USA and in EU) was estimated at 1500 Mg and 3800 Mg, respectively. Because of their persistent character, musk compounds are introduced into environment mostly via urban sewage treatment plant effluents. The aim of the presented research was to assess the receptivity of AHTN and HHCB to the oxidation by means of UV-radiation and in the UV /H2O2 process. The investigations were performed in the treated wastewater and the drinking water. After 8 minutes, in all experiments performed on drinking water, the degradations of AHTN and HHCB in the range of 99% were observed. The removal of HHCB from wastewater by means of UV radiation exceeded up 93% (after 8 minutes of the process), whereas the disappearance degree of this compound in wastewater, after only 3 minutes ofUV/H2O2 process, exceeded 99%. The degradation constant rate for AHTN in drinking water using UV radiation was equal to 0.764 rnin' when the degradation rate ofHHCB was estimated at 0.634 min'. In the wastewater, the coefficient rate ofHHCB degradation by means ofUV/H2O2 was nearly 4.5 times higher (1.580 min') in comparison to the value obtained by direct photolysis of HHCB (0.354 min').
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Authors and Affiliations

Ewa Felis
Alfredo C. Alder
Joanna Surmacz-Górska
Korneliusz Miksch
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Abstract

The photochemical degradation of the sulfadiazine (SDZ) was studied. The photochemical processes used in degradation of SDZ were UV and UV/H2O2. In the experiments hydrogen peroxide was applied at different concentrations: 10 mg/dm3 (2.94*10-4 M), 100 mg/dm3 (2.94*10-3 M), 1 g/dm3 (2.94*10-2 M) and 10 g/dm3 (2.94*10-1 M). The concentrations of SDZ during the experiment were controlled by means of HPLC. The best results of sulfadiazine degradation, the 100% removal of the compound, were achieved by photolysis using UV radiation in the presence of 100 mg H2O2/dm3 (2.94*10-3 M). The determined rate constant of sulfadiazine reaction with hydroxyl radicals kOH was equal 1.98*109 M-1s-1.

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Authors and Affiliations

Natalia Lemańska-Malinowska
Ewa Felis
Joanna Surmacz-Górska
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Abstract

Sulphonamides (SAs) are one of the most frequently detected anthropogenic micropollutants in the aquatic environment and their presence in it may pose a threat to living organisms. The aim of the study was to determine susceptibility of selected sulphonamides, i.e. sulfadiazine (SDZ) and sulfamethazine (SMZ), to degradation in the ozonation process and in enzymatic oxidation by unspecific peroxygenase extracted from Agrocybe aegerita mushroom ( AaeUPO). Moreover, the acute toxicity of the aqueous solution of the selected sulphonamides (SMZ and SDZ) before and after mentioned treatment processes were studied on the freshwater crustacean Daphnia magna. Initial concentrations were equal to 2×10-5 M for sulfadiazine and 1.8×10-5 M for sulfamethazine. The percentage of transformation for the O3 process was at the level 95% for both SDZ and SMZ (after 10 s of the process), whilst enzymatic oxidation of SDZ and SMZ by AaeUPO caused transformation efficiencies at the levels of 97% and 94% (after 1 minute of the process), respectively. The second order rate constants of selected sulfonamides with molecular ozone and fungal peroxidase were also determined in the research. EC50 (median effective concentration) values from toxicity test on D. magna were found in the range from 14.6% to 37.2%, depending on the type of the process. The conducted oxidation processes were efficient in degradation of selected sulphonamides. The toxicity of the mixtures before and after treatment was comparable and did not change significantly. The research have shown that biological processes are not always safer for living organisms compared to the chemical processes.
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Authors and Affiliations

Natalia Lemańska
1
Ewa Felis
2
Marzena Poraj-Kobielska
3
Zuzanna Gajda-Meissner
4
Martin Hofrichter
3

  1. EkoNorm Sp. z o.o., Katowice, Poland
  2. The Silesian University of Technology, Gliwice, Poland
  3. Technische Universität Dresden, Germany
  4. School of Life Sciences, Heriot-Watt University, Edinburgh, United Kingdom
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Abstract

The paper deals with the problem of the determination of the effects of temperature on the efficiency of the nitrification process of industrial wastewater, as well as its toxicity to the test organisms. The study on nitrification efficiency was performed using wastewater from one of Polish chemical factories. The chemical factory produces nitrogen fertilizers and various chemicals. The investigated wastewater was taken from the influent to the industrial mechanical-biological wastewater treatment plant (WWTP). The WWTP guaranteed high removal efficiency of organic compounds defined as chemical oxygen demand (COD) but periodical failure of nitrification performance was noted in last years of the WWTP operation. The research aim was to establish the cause of recurring failures of nitrification process in the above mentioned WWTP. The tested wastewater was not acutely toxic to activated sludge microorganisms. However, the wastewater was genotoxic to activated sludge microorganisms and the genotoxicity was greater in winter than in spring time. Analysis of almost 3 years’ period of the WWTP operation data and laboratory batch tests showed that activated sludge from the WWTP under study is very sensitive to temperature changes and the nitrification efficiency collapses rapidly under 16°C. Additionally, it was calculated that in order to provide the stable nitrification, in winter period the sludge age (SRT) in the WWTP should be higher than 35 days.

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Authors and Affiliations

Anna Gnida
Jan Sikora
Jarosław Wiszniowski
Ewa Felis
Joanna Surmacz-Górska
Korneliusz Miksch
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Abstract

Antibiotics are a group of substances potentially harmful to the environment. They can play a role in bacterial resistance transfer among pathogenic and non-pathogenic bacteria. In this experiment three representatives of medically important chemotherapeutics, confirmed to be present in high concentrations in wastewater treatment plants with HPLC analysis were used: erythromycin, sulfamethoxazole and trimethoprim. Erythromycin concentration in activated sludge was not higher than 20 ng L−1. N-acetylo-sulfamethoxazole concentration was 3349 ± 719 in winter and 2933 ± 429 ng L−1 in summer. Trimethoprim was present in wastewater at concentrations 400 ± 22 and 364 ± 60 ng L−1, respectively in winter and summer. Due to a wide variety of PCR-detectable resistance mechanisms towards these substances, the most common found in literature was chosen. For erythromycin: erm and mef genes, for sulfamethoxazole: sul1, sul2, sul3 genes, in the case of trimethoprim resistance dhfrA1 and dhfr14 were used in this study. The presence of resistance genes were analyzed in pure strains isolated from activated sludge and in the activated sludge sample itself. The research revealed that the value of minimal inhibitory concentration (MIC) did not correspond with the expected presence of more than one resistance mechanisms. Most of the isolates possessed only one of the genes responsible for a particular chemotherapeutic resistance. It was confirmed that it is possible to monitor the presence of resistance genes directly in activated sludge using PCR. Due to the limited isolates number used in the experiment these results should be regarded as preliminary.

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Authors and Affiliations

Aleksandra Ziembińska-Buczyńska
Ewa Felis
Justyna Folkert
Anna Meresta
Dominika Stawicka
Anna Gnida
Joanna Surmacz-Górska

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