Occurrence of trace organic contaminants in wastewater sludge and their removals by anaerobic digestion

Bioresource Technology
Shufan YangLong D Nghiem

Abstract

This study aims to evaluate the occurrence of trace organic contaminants (TrOCs) in wastewater sludge and their removal during anaerobic digestion. The significant occurrence of 18 TrOCs in primary sludge was observed. These TrOCs occurred predominantly in the solid phase. Some of these TrOCs (e.g. paracetamol, caffeine, ibuprofen and triclosan) were also found at high concentrations (>10,000ng/L) in the aqueous phase. The overall removal of TrOCs (from both the aqueous and solid phase) by anaerobic digestion was governed by their molecular structure (e.g. the presence/absence of electron withdrawing/donating functional groups). While an increase in sludge retention time (SRT) of the digester resulted in a small but clearly discernible increase in basic biological performance (e.g. volatile solids removal and biogas production), the impact of SRT on TrOC removal was negligible. The lack of SRT influence on TrOC removal suggests that TrOCs were not the main substrate for anaerobic digestion.

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Citations

Feb 16, 2017·Environmental Science & Technology·Lorena Gonzalez-GilJuan M Lema
May 21, 2018·Tropical Medicine & International Health : TM & IH·Isaac Dennis AmoahThor Axel Stenström
Jul 2, 2019·Environmental Science. Processes & Impacts·Aasim M AliRoland Kallenborn
May 17, 2018·Environmental Science and Pollution Research International·Lei ZhengLong D Nghiem
Jul 19, 2020·Bioprocess and Biosystems Engineering·Aline ViancelliHelen Treichel
Dec 9, 2020·International Journal of Molecular Sciences·Timothy AbbottCigdem Eskicioglu
Jul 7, 2020·The Science of the Total Environment·Caroline F GranattoMaria Bernadete A Varesche
Oct 14, 2020·Journal of Environmental Management·Teddy Kabeya KasongaMaggy Ndombo Benteke Momba
Feb 13, 2021·Environmental Pollution·Rayane Kunert LangbehnHugo Moreira Soares
Dec 28, 2019·Journal of Hazardous Materials·Rodrigo B CarneiroJuan M Lema
Jul 2, 2021·Water Environment Research : a Research Publication of the Water Environment Federation·Lisann Hammer, Laurence Palmowski

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