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Title: Transformation of dissolved organic matters produced from alkaline-ultrasonic sludge pretreatment in anaerobic digestion : from macro to micro
Authors: Lu, Dan
Xiao, Keke
Chen, Yun
Soh, Annie Yan Ni
Zhou, Yan
Keywords: Engineering::Environmental engineering
Issue Date: 2018
Source: Lu, D., Xiao, K., Chen, Y., Soh, A. Y. N., & Zhou, Y. (2018). Transformation of dissolved organic matters produced from alkaline-ultrasonic sludge pretreatment in anaerobic digestion : from macro to micro. Water Research, 142, 138-146. doi:10.1016/j.watres.2018.05.044
Journal: Water research
Abstract: Soluble organic compounds released by alkaline (ALK), ultrasonic (ULS) and combined alkaline-ultrasonic (ALK-ULS) pretreatment as well as their transformation in the anaerobic digestion systems were investigated. The maximum methane production of 197.1 ± 3.0 mL CH4/g tCODfeed was observed with ALK-ULS pretreated sludge (pH 12 and specific energy input of 24 kJ/g TS). The combined treatment likely enhanced the sludge solubilization and produced more low molecular weight (LMW) substances, which were beneficial to improve the biogas generation rate. However, such pretreatment released not only easily biodegradable substances but also more recalcitrants, such as humic substances (HS) and complex high molecular weight (HMW) proteins. Thus, more residual dissolved organic matters (DOMs) were detected after digestion, which may pose adverse effects on the downstream water treatment. Refractory HS and hydrophobic dissolved organic carbon (HO DOC) were the main components of the residual DOMs, which accounted up to 35.0% and 22.3% respectively. At the molecular level, a large amount of residual polycyclic steroid-like matters, alkanes and aromatics were identified. Specific higher MW residual compounds, e.g. polar metabolites (like dipeptide, benzene and substituted derivatives), and non-polar lipids (like diacylglycerols, long chain fatty acids, alkenes, flavonoids, sphingolipids, glycerolipids, glycerophospholipids and their derivatives) were also identified. The results indicate that further polishing steps should be considered to remove the remaining soluble recalcitrant compounds. This study helps to understand the insight of sludge treatment from macro to micro level.
ISSN: 0043-1354
DOI: 10.1016/j.watres.2018.05.044
Rights: © 2018 Elsevier Ltd. All rights reserved. This paper was published in Water research and is made available with permission of Elsevier Ltd.
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:CEE Journal Articles

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