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

Yang, Shufan, Hai, Faisal I., Price, William E., McDonald, James, Khan, Stuart J., Nghiem, Long D.·2016·Bioresource Technology
DOI 10.1016/j.biortech.2015.12.080
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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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  • Pre-treatment methods to enhance sludge biodegradability include thermal pre-treatment, enzymatic treatment, ozonation, chemical solubilization by acidification or alkaline hydrolysis, mechanical sludge disintegration, and ultrasonic pre-treatment.

    “To enhance the biodegradability of sludge, several pre-treatment methods may be employed.These include thermal pre-treatment, enzymatic treatment, ozonation, chemical solubilization by acidification or alkaline hydrolysis, as well as mechanical sludge disintegration and ultrasonic pre-treatment [298,299].”

    From Recent Advances in the Remediation of Textile-Dye-Containing Wastewater: Prioritizing Human Health and Sustainable Wastewater Treatment (2024) · cites this paper as [299]

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Cited by

Sorted by citations

Metadata

Authors
Yang, S., Hai, F. I., Price, W. E., McDonald, J., Khan, S. J., & Nghiem, L. D.
Venue
Bioresource Technology
Publisher
Elsevier BV
Published
2016-06
Volume
210
Pages
153-159
ISSN
0960-8524
DOI
10.1016/j.biortech.2015.12.080
Cited by
110
References
0
Language
en
Licence
www.elsevier.com/tdm/userlicense/1.0/ (tdm)

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