Optimizing the synergistic effect of sodium hydroxide/ultrasound pre-treatment of sludge
Article
Article Title | Optimizing the synergistic effect of sodium hydroxide/ultrasound pre-treatment of sludge |
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ERA Journal ID | 34301 |
Article Category | Article |
Authors | Tian, Xinbo (Author), Ng, Wun Jern (Author) and Trzcinski, Antoine P. (Author) |
Journal Title | Ultrasonics Sonochemistry |
Journal Citation | 48, pp. 432-440 |
Number of Pages | 9 |
Year | 2018 |
Place of Publication | Netherlands |
ISSN | 1350-4177 |
1873-2828 | |
Digital Object Identifier (DOI) | https://doi.org/10.1016/j.ultsonch.2018.07.005 |
Web Address (URL) | https://www.sciencedirect.com/science/article/pii/S1350417718302712?via%3Dihub |
Abstract | Ultrasound (ULS), sodium hydroxide (NaOH) and combined ultrasound/NaOH pre-treatment were applied to pre-treat waste activated sludge and improve the subsequent anaerobic digestion. Synergistic effect was observed when NaOH treatment was coupled with ultrasound treatment. The highest synergistic Chemical Oxygen Demand (COD) solubilization was observed when 0.02M NaOH was combined with five minutes ultrasonication: an extra 3,000 mg/L was achieved on top of the NaOH (1,975 mg/L) and ultrasonication (2,900 mg/L) treatment alone. Further increase of NaOH dosage increased Soluble Chemical Oxygen Demand (SCOD), but did not increase the synergistic effect. Nine minutes and 18 minutes ultrasonication led to 20% and 24% increase of methane production, respectively; Whereas, 0.05M NaOH pre-treatment did not improve the sludge biodegradability. Combined ultrasound/NaOH (9min+0.05M) showed 31% increase of methane production. A stepwise NaOH addition/ultrasound pre-treatment (0.02M+ULS for 5 min + 0.02M+ULS for 4 min) was tested and resulted in 40% increase |
Keywords | Waste Activated Sludge (WAS); ultrasonication; NaOH; pre-treatment; anaerobic biodegradability |
ANZSRC Field of Research 2020 | 400410. Wastewater treatment processes |
410404. Environmental management | |
401102. Environmentally sustainable engineering | |
Public Notes | Files associated with this item cannot be displayed due to copyright restrictions. |
Byline Affiliations | Nanyang Technological University, Singapore |
School of Civil Engineering and Surveying | |
Institution of Origin | University of Southern Queensland |
https://research.usq.edu.au/item/q4w08/optimizing-the-synergistic-effect-of-sodium-hydroxide-ultrasound-pre-treatment-of-sludge
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