Seasonal variations in acidogenic fermentation of filter primary sludge
(2023) In Water Research 242.- Abstract
Primary treatment of municipal wastewater by rotating belt filtration followed by hydrolysis and acidogenic fermentation of the filter primary sludge (FPS) at ambient temperature was studied at pilot-scale during one year. The seasonal variations of volatile fatty acids (VFAs), nutrient release and soluble COD production as well as microbial community assembly were assessed, leading to novel findings for fermentation at ambient temperature. The reproducibility of VFA production performance was first established by operating the two fermentation reactors under the same conditions, showing similar results regarding VFA production and microbial community structure. One year of operation at 5 d retention time (RT) and 16–29 °C resulted in... (More)
Primary treatment of municipal wastewater by rotating belt filtration followed by hydrolysis and acidogenic fermentation of the filter primary sludge (FPS) at ambient temperature was studied at pilot-scale during one year. The seasonal variations of volatile fatty acids (VFAs), nutrient release and soluble COD production as well as microbial community assembly were assessed, leading to novel findings for fermentation at ambient temperature. The reproducibility of VFA production performance was first established by operating the two fermentation reactors under the same conditions, showing similar results regarding VFA production and microbial community structure. One year of operation at 5 d retention time (RT) and 16–29 °C resulted in an average VFA yield of 180±35 mg COD/g VSin and soluble COD yield of 242±40 mg COD/g VSin. The VFA formation was temperature-dependent, with ϴ=1.033±0.005 (r=r20·Θ(T−20∘C)). The seasonal variations of the acetic and propionic acid productions were pronounced, whereas the productions of VFAs with longer chains were more stable regardless of temperature. The community structure of the reactor microbiomes was also clearly affected by season and temperature and linked with the production spectrum of VFAs. The ammonium and phosphate releases were stable during the year, leading to a decrease in ratios of soluble COD to NH4+-N and PO43−-P during winter. The soluble COD yield was 11% and 27% higher at 5 d RT compared to 3 and 2 d RT respectively, but the corresponding volumetric productivities were lower. The dissimilarities between microbiomes in influent FPS and fermenters were significant even at a short RT of 2 d, and increased with longer RT of 3 and 5 d, primarily caused by selection of bacteria within Bacteroidota in the fermentation reactors.
(Less)
- author
- Ossiansson, Elin ; Persson, Frank ; Bengtsson, Simon ; Cimbritz, Michael LU and Gustavsson, David J.I.
- organization
- publishing date
- 2023
- type
- Contribution to journal
- publication status
- published
- subject
- keywords
- Carbon source, Fermentation, Hydrolysis, Primary sludge, Rotating belt filter, Volatile fatty acids
- in
- Water Research
- volume
- 242
- article number
- 120181
- publisher
- Elsevier
- external identifiers
-
- pmid:37343334
- scopus:85162118843
- ISSN
- 0043-1354
- DOI
- 10.1016/j.watres.2023.120181
- language
- English
- LU publication?
- yes
- id
- 8e43bbef-2f3f-4f5b-97da-718c611650bd
- date added to LUP
- 2023-09-01 14:18:43
- date last changed
- 2024-04-20 02:23:38
@article{8e43bbef-2f3f-4f5b-97da-718c611650bd,
abstract = {{<p>Primary treatment of municipal wastewater by rotating belt filtration followed by hydrolysis and acidogenic fermentation of the filter primary sludge (FPS) at ambient temperature was studied at pilot-scale during one year. The seasonal variations of volatile fatty acids (VFAs), nutrient release and soluble COD production as well as microbial community assembly were assessed, leading to novel findings for fermentation at ambient temperature. The reproducibility of VFA production performance was first established by operating the two fermentation reactors under the same conditions, showing similar results regarding VFA production and microbial community structure. One year of operation at 5 d retention time (RT) and 16–29 °C resulted in an average VFA yield of 180±35 mg COD/g VS<sub>in</sub> and soluble COD yield of 242±40 mg COD/g VS<sub>in</sub>. The VFA formation was temperature-dependent, with ϴ=1.033±0.005 (r=r<sub>20</sub>·Θ<sup>(T−20<sup>∘</sup>C)</sup>). The seasonal variations of the acetic and propionic acid productions were pronounced, whereas the productions of VFAs with longer chains were more stable regardless of temperature. The community structure of the reactor microbiomes was also clearly affected by season and temperature and linked with the production spectrum of VFAs. The ammonium and phosphate releases were stable during the year, leading to a decrease in ratios of soluble COD to NH<sub>4</sub><sup>+</sup>-N and PO<sub>4</sub><sup>3−</sup>-P during winter. The soluble COD yield was 11% and 27% higher at 5 d RT compared to 3 and 2 d RT respectively, but the corresponding volumetric productivities were lower. The dissimilarities between microbiomes in influent FPS and fermenters were significant even at a short RT of 2 d, and increased with longer RT of 3 and 5 d, primarily caused by selection of bacteria within Bacteroidota in the fermentation reactors.</p>}},
author = {{Ossiansson, Elin and Persson, Frank and Bengtsson, Simon and Cimbritz, Michael and Gustavsson, David J.I.}},
issn = {{0043-1354}},
keywords = {{Carbon source; Fermentation; Hydrolysis; Primary sludge; Rotating belt filter; Volatile fatty acids}},
language = {{eng}},
publisher = {{Elsevier}},
series = {{Water Research}},
title = {{Seasonal variations in acidogenic fermentation of filter primary sludge}},
url = {{http://dx.doi.org/10.1016/j.watres.2023.120181}},
doi = {{10.1016/j.watres.2023.120181}},
volume = {{242}},
year = {{2023}},
}