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Investigation of the impact of trace elements on anaerobic volatile fatty acid degradation using a fractional factorial experimental design

Investigation of the impact of trace elements on anaerobic volatile fatty acid degradation using a fractional factorial experimental design
Investigation of the impact of trace elements on anaerobic volatile fatty acid degradation using a fractional factorial experimental design
The requirement of trace elements (TE) in anaerobic digestion process is widely documented. However, little is understood regarding the specific requirement of elements and their critical concentrations under different operating conditions such as substrate characterisation and temperature.
In this study, a flask batch trial using fractional factorial design is conducted to investigate volatile fatty acids (VFA) anaerobic degradation rate under the influence of the individual and combined effect of six TEs (Co, Ni, Mo, Se, Fe and W). The experiment inoculated with food waste digestate, spiked with sodium acetate and sodium propionate both to 10 g/l. Thisis followed by the addition of a selection of the six elements in accordance with a 26-2 fractional factorial principle. The experiment is conducted in duplicate and the degradation of VFA is regularly monitored.
Factorial effect analysis on the experimental results reveals that within these experimental conditions, Se has a key role in promoting the degradation rates of both acetic and propionic acids; Mo and Co are found to have a modest effect on increasing propionic acid degradation rate. It is also revealed that Ni shows some inhibitory effects on VFA degradation, possibly due to its toxicity. Additionally, regression coefficients for the main and second order effects are calculated to establish regression models for VFA degradation.
anaerobic digestion, Volatile fatty acids (VFA) degradation, Trace elements, fractional factorial designs
0043-1354
458-465
Jiang, Ying
db0be779-4c23-4d32-8d5d-2bbca80e6247
Zhang, Yue
69b11d32-d555-46e4-a333-88eee4628ae7
Banks, Charles
5c6c8c4b-5b25-4e37-9058-50fa8d2e926f
Heaven, Sonia
f25f74b6-97bd-4a18-b33b-a63084718571
Longhurst, Philip
317cc39c-5875-4685-90c4-bf725ce3212b
Jiang, Ying
db0be779-4c23-4d32-8d5d-2bbca80e6247
Zhang, Yue
69b11d32-d555-46e4-a333-88eee4628ae7
Banks, Charles
5c6c8c4b-5b25-4e37-9058-50fa8d2e926f
Heaven, Sonia
f25f74b6-97bd-4a18-b33b-a63084718571
Longhurst, Philip
317cc39c-5875-4685-90c4-bf725ce3212b

Jiang, Ying, Zhang, Yue, Banks, Charles, Heaven, Sonia and Longhurst, Philip (2017) Investigation of the impact of trace elements on anaerobic volatile fatty acid degradation using a fractional factorial experimental design. Water Research, 125, 458-465. (doi:10.1016/j.watres.2017.09.010).

Record type: Article

Abstract

The requirement of trace elements (TE) in anaerobic digestion process is widely documented. However, little is understood regarding the specific requirement of elements and their critical concentrations under different operating conditions such as substrate characterisation and temperature.
In this study, a flask batch trial using fractional factorial design is conducted to investigate volatile fatty acids (VFA) anaerobic degradation rate under the influence of the individual and combined effect of six TEs (Co, Ni, Mo, Se, Fe and W). The experiment inoculated with food waste digestate, spiked with sodium acetate and sodium propionate both to 10 g/l. Thisis followed by the addition of a selection of the six elements in accordance with a 26-2 fractional factorial principle. The experiment is conducted in duplicate and the degradation of VFA is regularly monitored.
Factorial effect analysis on the experimental results reveals that within these experimental conditions, Se has a key role in promoting the degradation rates of both acetic and propionic acids; Mo and Co are found to have a modest effect on increasing propionic acid degradation rate. It is also revealed that Ni shows some inhibitory effects on VFA degradation, possibly due to its toxicity. Additionally, regression coefficients for the main and second order effects are calculated to establish regression models for VFA degradation.

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Trace Element Factorial DEsign Scholar version - Accepted Manuscript
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More information

Accepted/In Press date: 3 September 2017
e-pub ahead of print date: 5 September 2017
Published date: 15 November 2017
Keywords: anaerobic digestion, Volatile fatty acids (VFA) degradation, Trace elements, fractional factorial designs

Identifiers

Local EPrints ID: 414149
URI: http://eprints.soton.ac.uk/id/eprint/414149
ISSN: 0043-1354
PURE UUID: 78a42dae-18a8-489c-9791-adda5ac086eb
ORCID for Yue Zhang: ORCID iD orcid.org/0000-0002-5068-2260
ORCID for Sonia Heaven: ORCID iD orcid.org/0000-0001-7798-4683

Catalogue record

Date deposited: 15 Sep 2017 16:30
Last modified: 07 Oct 2020 04:42

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