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Civil And Environmental Engineering Reports

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Stability of Selected PAHs in Sewage Sludge/ Stabilność Wybranych Wwa W Osadach Ściekowych

Maria Włodarczyk-Makuła
  • Corresponding author
  • Czestochowa University of Technology, Department of Chemistry, Water and Wastewater Technology, Poland
  • Email:
Published Online: 2015-02-06 | DOI: https://doi.org/10.1515/ceer-2014-0028

Abstract

The aim of the investigations was to estimate the half-life of selected PAHs in sewage sludge. Five hydrocarbons selected from 16 PAHs- EPA were chosen. In this study, the quantity changes in the concentration 3- and 4-ring of PAHs in sewage sludges were investigated. Sewage sludges were stored under aerobic conditions for 12 weeks. At the same time the sewage sludges with the added sodium azide, in order to deactivate the microorganisms (abiotic samples), were also stored. Gas chromatography-mass spectrometry was used to qualify and quantify PAHs in 2-week intervals. Sewage sludges were taken from a municipal wastewater treatment plant. Under experimental conditions the half-lives of individual compounds were diversed. In biotic samples halflife of hydrocarbons was in the range of 19 to 368 days. Half-life of PAHs in abiotic sewage sludges was in the range of 31 to 2961 days. The most persistent were phenanthrene.

Streszczenie

Celem badań była ocena trwałości WWA w warunkach składowania poprzez wyznaczenie czasu połowicznego rozpadu. Określono zmiany ilościowe WWA w osadach przechowywanych w warunkach tlenowych przez 12 tygodni. W tych samych warunkach pozostawały także osady, w których zahamowano aktywność mikroorganizmów poprzez dodatek azydku sodu. Ilościową analizę WWA prowadzono z wykorzystaniem zestawu GC-MS w odstępach 2-tygodniowych równolegle w osadach biotycznych i abiotycznych. Oznaczano pięć WWA (fluoren, fenentren, antracen, fluoranten, piren), które znajdują się wśród 16 związków podanych na liście EPA. Osady pobrano dwukrotnie z oczyszczalni ścieków komunalnych, które w praktyce kierowane są na składowisko. Zawartość początkowa WWA w osadach była na poziomie 346μg/kg.s.m. W warunkach prowadzonego eksperymentu czas połowicznego rozkładu był zróżnicowany dla poszczególnych związków. W osadach aktywnych biologicznie czas połowicznego rozpadu badanych węglowodorów był w granicach od 19 do 368 dób. Czas połowicznego rozpadu wyznaczony dla WWA w osadach nieaktywnych biologicznie pozostawał w zakresie od 31 do 2961 dób.

Keywords: fluorene; phenanthrene; anthracene; fluoranthene; pyrene; half-live; sewage sludge; aerobic conditions; sodium azide

Słowa kluczowe: fluoren; fenantren; antracen; fluoranten; piren; czas półrozpadu; osady ściekowe; warunki tlenowe; azydek sodu

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About the article

Received: 2014-08-09

Published Online: 2015-02-06

Published in Print: 2014-09-01


Citation Information: Civil And Environmental Engineering Reports, ISSN (Online) 2450-8594, ISSN (Print) 2080-5187, DOI: https://doi.org/10.1515/ceer-2014-0028. Export Citation

© 2015. This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License. (CC BY-NC-ND 3.0)

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