Phosphorus release and realignment in anaerobic digestion of thermal hydrolysis pretreatment sludge - masking effects from high ammonium

Waste activated sludge (WAS) is a significant phosphorus (P) repository, and there is a growing interest in P recovery from WAS. Typically, the commercial technology for treating WAS involves thermal hydrolysis pretreatment (THP) coupled with anaerobic digestion (AD). However, there is ongoing debat...

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Main Authors: Chen, Yun, Ding, Wei, Bai, Yu, Wang, Xiao, Shen, Nan, Li, Lei, Lu, Dan, Zhou, Yan
Other Authors: School of Civil and Environmental Engineering
Format: Article
Language:English
Published: 2024
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Online Access:https://hdl.handle.net/10356/175816
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Institution: Nanyang Technological University
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spelling sg-ntu-dr.10356-1758162024-05-07T04:24:51Z Phosphorus release and realignment in anaerobic digestion of thermal hydrolysis pretreatment sludge - masking effects from high ammonium Chen, Yun Ding, Wei Bai, Yu Wang, Xiao Shen, Nan Li, Lei Lu, Dan Zhou, Yan School of Civil and Environmental Engineering Engineering Anaerobic digestion Waste activated sludge Waste activated sludge (WAS) is a significant phosphorus (P) repository, and there is a growing interest in P recovery from WAS. Typically, the commercial technology for treating WAS involves thermal hydrolysis pretreatment (THP) coupled with anaerobic digestion (AD). However, there is ongoing debate regarding the transformation and distribution of P throughout this process. To address this, a long-term THP-AD process was operated in this study to comprehensively investigate P transformation and distribution. The results revealed that a substantial biodegradation of dissolved organic nitrogen (DON) raised the pH of the digestate to 8.3 during the AD process. This increased pH facilitated the dissolution of Al, leading to a reduction of 6.92 mg/L of NaOH-P. Simultaneously, sulfate reduction contributed to a decrease of 11.04 mg/L of Bipy-P in the solid. However, the reduction of Bipy-P and NaOH-P in the solid did not result in an improved P release to the supernatant. Conversely, a decrease of 23.60 mg/L P in the aqueous phase was observed after anaerobic digestion. The disappeared P was primarily precipitated with Mg and Ca, driven by the increased pH, and it contributed to the increase of HCl-P in the solid from 107.80 to 144.52 mg/L. These findings were further confirmed by results obtained from scanning electron microscopy (SEM), X-ray powder diffraction (XRD), and solid-state 31P nuclear magnetic resonance (NMR) spectroscopy. This study provides valuable insights into the mechanisms of P transformation during THP-AD process that is nearly opposite from conventional AD system. Agency for Science, Technology and Research (A*STAR) This work was supported by the Agency for Science, Technology and Research (A*STAR), Singapore SFS IAF-PP grant (A20H7a0152), the National Natural Science Foundation of China (52000107 and 42077292). 2024-05-07T04:24:51Z 2024-05-07T04:24:51Z 2024 Journal Article Chen, Y., Ding, W., Bai, Y., Wang, X., Shen, N., Li, L., Lu, D. & Zhou, Y. (2024). Phosphorus release and realignment in anaerobic digestion of thermal hydrolysis pretreatment sludge - masking effects from high ammonium. Water Research, 255, 121488-. https://dx.doi.org/10.1016/j.watres.2024.121488 0043-1354 https://hdl.handle.net/10356/175816 10.1016/j.watres.2024.121488 38513371 2-s2.0-85188520902 255 121488 en A20H7a0152 Water Research © 2024 Elsevier Ltd. All rights reserved.
institution Nanyang Technological University
building NTU Library
continent Asia
country Singapore
Singapore
content_provider NTU Library
collection DR-NTU
language English
topic Engineering
Anaerobic digestion
Waste activated sludge
spellingShingle Engineering
Anaerobic digestion
Waste activated sludge
Chen, Yun
Ding, Wei
Bai, Yu
Wang, Xiao
Shen, Nan
Li, Lei
Lu, Dan
Zhou, Yan
Phosphorus release and realignment in anaerobic digestion of thermal hydrolysis pretreatment sludge - masking effects from high ammonium
description Waste activated sludge (WAS) is a significant phosphorus (P) repository, and there is a growing interest in P recovery from WAS. Typically, the commercial technology for treating WAS involves thermal hydrolysis pretreatment (THP) coupled with anaerobic digestion (AD). However, there is ongoing debate regarding the transformation and distribution of P throughout this process. To address this, a long-term THP-AD process was operated in this study to comprehensively investigate P transformation and distribution. The results revealed that a substantial biodegradation of dissolved organic nitrogen (DON) raised the pH of the digestate to 8.3 during the AD process. This increased pH facilitated the dissolution of Al, leading to a reduction of 6.92 mg/L of NaOH-P. Simultaneously, sulfate reduction contributed to a decrease of 11.04 mg/L of Bipy-P in the solid. However, the reduction of Bipy-P and NaOH-P in the solid did not result in an improved P release to the supernatant. Conversely, a decrease of 23.60 mg/L P in the aqueous phase was observed after anaerobic digestion. The disappeared P was primarily precipitated with Mg and Ca, driven by the increased pH, and it contributed to the increase of HCl-P in the solid from 107.80 to 144.52 mg/L. These findings were further confirmed by results obtained from scanning electron microscopy (SEM), X-ray powder diffraction (XRD), and solid-state 31P nuclear magnetic resonance (NMR) spectroscopy. This study provides valuable insights into the mechanisms of P transformation during THP-AD process that is nearly opposite from conventional AD system.
author2 School of Civil and Environmental Engineering
author_facet School of Civil and Environmental Engineering
Chen, Yun
Ding, Wei
Bai, Yu
Wang, Xiao
Shen, Nan
Li, Lei
Lu, Dan
Zhou, Yan
format Article
author Chen, Yun
Ding, Wei
Bai, Yu
Wang, Xiao
Shen, Nan
Li, Lei
Lu, Dan
Zhou, Yan
author_sort Chen, Yun
title Phosphorus release and realignment in anaerobic digestion of thermal hydrolysis pretreatment sludge - masking effects from high ammonium
title_short Phosphorus release and realignment in anaerobic digestion of thermal hydrolysis pretreatment sludge - masking effects from high ammonium
title_full Phosphorus release and realignment in anaerobic digestion of thermal hydrolysis pretreatment sludge - masking effects from high ammonium
title_fullStr Phosphorus release and realignment in anaerobic digestion of thermal hydrolysis pretreatment sludge - masking effects from high ammonium
title_full_unstemmed Phosphorus release and realignment in anaerobic digestion of thermal hydrolysis pretreatment sludge - masking effects from high ammonium
title_sort phosphorus release and realignment in anaerobic digestion of thermal hydrolysis pretreatment sludge - masking effects from high ammonium
publishDate 2024
url https://hdl.handle.net/10356/175816
_version_ 1800916139718475776