Session 22 - Emerging pollutants

[CEST2019_00375] Identification of biotransformation products of veterinary drugs present in piggery wastewater during treatment with photobioreactors based on microalgae-bacteria and purple phototrophic bacteria consortia
by López-Serna R., García D., Bolado S., Jiménez J.J., Lai F.Y., Golovko O., Ahrens L., Wiberg K., Gago-Ferrero P., Muñoz R.

This work identified transformation products (TPs) from 16 antibiotics, 1 anti-parasitic, 1 analgesic and 1 hormone, present in spiked real piggery wastewater (PWW) before and after two different treatments in two open photobioreactors operated continuously with a consortium of microalgae-bacteria and purple photosynthetic bacteria. For this purpose, suspect and non-target strategies based on liquid chromatography quadrupole-time-of-flight mass spectrometry (LC-QTOF-MS) were used. The application of quantitative structure-retention relationship (QSRR) prediction models, in addition to a comprehensive evaluation of the obtained MS/MS spectra, provided valuable information to support the identifications. The confirmation of the TPs was carried out with the corresponding reference standards, when these were commercially available. Alternatively, probable structures of the TPs based on diagnostic evidence were proposed. To the best of our knowledge, some of the identified TPs have never been reported before. A transformation pathway for their biotransformation has been proposed. The presence of the identified TPs was assessed in real PWW samples through retrospective analysis. Ultimately, the potential ecotoxicological risk posed by these nineteen veterinary drugs and their TPs was evaluated by means of risk quotients.

Session: 22, Room: D, at Fri, 09/06/2019 - 09:30 to 09:45
Oral presentation in Emerging pollutants
[CEST2019_00130] Mass balance of selected pharmaceuticals in an Austrian river catchment area: estimation of the different source contributions
by Ghirardini A., Verlicchi P., Zoboli O., Zessner M.

The study refers to the assessment of the annual mass loadings of two pharmaceuticals (PhCs), sulfamethoxazole (SMX) and carbamazepine (CBZ), released in the river of an Austrian catchment area by wastewater treatment plant (WWTP) effluent, combined sewage overflows (CSOs), surface runoff, tile drainage and deep water (referring to the sludge- or manure-amended soil).
WWTP effluent and excess sludge loadings, based on PhC national human consumption, literature excretion rates, were modeled by Activity SimpleTreat. CSO loading was modelled by MoRE. PhC load in manure was estimated on the basis of the animal annual production and literature data of concentration. Surface runoff, tile drainage and deep water loadings were modelled integrating a literature “leachate” approach with the expected PhC phenomena of accumulation, degradation and erosion occurring in the soil.
The study develops a mass balance of the different pharmaceutical loading contributions to the receiving water body by means of STAN model and highlights the uncertainties associated to the selected values in the estimation. It emerges that manure amount applied on the soil is fundamental in defining the priority contributions among the different sources (WWTP effluent, CSOs, surface runoff, tile drainage and deep water).

Session: 22, Room: D, at Fri, 09/06/2019 - 09:45 to 10:00
Oral presentation in Emerging pollutants
[CEST2019_00143] Adsorption technology in waste water treatment processes utilizing activated carbons as adsorbent materials prepared from waste vehicular tires: Recent research and trends in the removal of various toxic and persistent organic and inorganic pollutants
by Vagi M.C., Petsas A.S.

Various toxic contaminants when are present in the environment pose a threat to the inhabitants of natural ecosystems owing to their non-biodegradable nature that increases their high toxicity towards non-target organisms. The large mass of solid wastes that are generated from waste rubber tires unquestionably consists a serious threat of environmental pollution around the world. Consequently, scientific interest has focused on several recycling strategies and practices converting them into more valuable products such as adsorbents widely utilized for the removal of several different inorganic and organic compounds from environmental samples. Hence, the main objective of the present study is to review all the data in the available published bibliography concerning the recent research and future trends on using granulated adsorbent materials and activated carbons obtained and prepared from waste tires and afterwards applied for the removal of persistent and residual quantities of pollutants.

Session: 22, Room: D, at Fri, 09/06/2019 - 10:00 to 10:15
Oral presentation in Emerging pollutants
[CEST2019_00157] The pyrolysis of perfluorocarboxylic acids - effect of chain length
by Dixon L., Weber N., Stockenhuber S., Molloy S., Lucas J., Grimison C., Stockenhuber M., Mackie J., Kennedy E.

Per- and polyfluoroalkyl substance (PFAS) are increasingly becoming the contamination issue of our time, due to their environmental persistence, bioaccumulation and mounting evidence of their toxicity. Herein we examined the pyrolytic decomposition of a series of perfluorocarboxylic acids via the production of CO and CO2, utilizing FTIR and GC/MS analysis.
We observed the presence of a parallel surface-mediated reaction in conjunction with the gas-phase pyrolysis.

Session: 22, Room: D, at Fri, 09/06/2019 - 10:15 to 10:30
Oral presentation in Emerging pollutants