Effects of barium on the pathways of anaerobic digestion

V. Wyman, A. Serrano, R. Borja, A. Jiménez, A. Carvajal, M. Lenz, J. Bartacek, F.G. Fermoso

Research output: Contribution to journalArticleAcademicpeer-review

Abstract

The sufficient presence of trace elements (TE) is essential for anaerobic digestion. Barium (Ba) is considered a non-essential trace element that can be collaterally added to digesters as part of low-cost trace element sources or because of its presence in some feedstocks, such as crude glycerol. In the present study, the impact of Ba supplementation (2–2000 mg/L) on each stage of the anaerobic digestion (AD) process was evaluated using pure substrates (i.e., cellulose, glucose, a mixture of volatile fatty acids, sodium acetate and hydrogen) as well as a complex substrate (i.e., dried green fodder). Hydrolytic activity was affected at dosages higher than 200 mg Ba/L, whereas cellulose degradation was completely inhibited at 2000 mg Ba/L. The negative effects of the addition of Ba to methane production were observed only in the hydrolytic activity, and no effects were detected at any barium dosage in the subsequent anaerobic steps. Because Ba does not have a reported role as a cofactor of enzymes, this response could have been due to a direct inhibitory effect, a variation in the bioavailability of other trace elements, or even the availability of CO2/SO4 through precipitation as Ba-carbonates and sulphates. The results showed that the addition of Ba modified the chemical equilibrium of the studied system by varying the soluble concentration of some TEs and therefore their bioavailability. The highest variation was detected in the soluble concentration of zinc, which increased as the amount of Ba increased. Although little research has shown that Ba has some utility in anaerobic processes, its addition must be carefully monitored to avoid an undesirable modification of the chemical equilibrium in the system.

LanguageEnglish
Pages397-403
JournalJournal of Environmental Management
Volume232
DOIs
Publication statusPublished - 15 Feb 2019

Fingerprint

Anaerobic digestion
barium
Barium
Trace elements
trace element
bioavailability
cellulose
Cellulose
effect
anaerobic digestion
Volatile fatty acids
substrate
fodder
Substrates
Glycerol
Feedstocks
Glucose
Carbonates
acetate
glucose

Keywords

  • Hydrolysis
  • Metal bioavailability
  • Trace element dosing
  • Trace elements

Cite this

Wyman, V., Serrano, A., Borja, R., Jiménez, A., Carvajal, A., Lenz, M., ... Fermoso, F. G. (2019). Effects of barium on the pathways of anaerobic digestion. Journal of Environmental Management, 232, 397-403. https://doi.org/10.1016/j.jenvman.2018.11.065
Wyman, V. ; Serrano, A. ; Borja, R. ; Jiménez, A. ; Carvajal, A. ; Lenz, M. ; Bartacek, J. ; Fermoso, F.G. / Effects of barium on the pathways of anaerobic digestion. In: Journal of Environmental Management. 2019 ; Vol. 232. pp. 397-403.
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Wyman, V, Serrano, A, Borja, R, Jiménez, A, Carvajal, A, Lenz, M, Bartacek, J & Fermoso, FG 2019, 'Effects of barium on the pathways of anaerobic digestion', Journal of Environmental Management, vol. 232, pp. 397-403. https://doi.org/10.1016/j.jenvman.2018.11.065

Effects of barium on the pathways of anaerobic digestion. / Wyman, V.; Serrano, A.; Borja, R.; Jiménez, A.; Carvajal, A.; Lenz, M.; Bartacek, J.; Fermoso, F.G.

In: Journal of Environmental Management, Vol. 232, 15.02.2019, p. 397-403.

Research output: Contribution to journalArticleAcademicpeer-review

TY - JOUR

T1 - Effects of barium on the pathways of anaerobic digestion

AU - Wyman, V.

AU - Serrano, A.

AU - Borja, R.

AU - Jiménez, A.

AU - Carvajal, A.

AU - Lenz, M.

AU - Bartacek, J.

AU - Fermoso, F.G.

PY - 2019/2/15

Y1 - 2019/2/15

N2 - The sufficient presence of trace elements (TE) is essential for anaerobic digestion. Barium (Ba) is considered a non-essential trace element that can be collaterally added to digesters as part of low-cost trace element sources or because of its presence in some feedstocks, such as crude glycerol. In the present study, the impact of Ba supplementation (2–2000 mg/L) on each stage of the anaerobic digestion (AD) process was evaluated using pure substrates (i.e., cellulose, glucose, a mixture of volatile fatty acids, sodium acetate and hydrogen) as well as a complex substrate (i.e., dried green fodder). Hydrolytic activity was affected at dosages higher than 200 mg Ba/L, whereas cellulose degradation was completely inhibited at 2000 mg Ba/L. The negative effects of the addition of Ba to methane production were observed only in the hydrolytic activity, and no effects were detected at any barium dosage in the subsequent anaerobic steps. Because Ba does not have a reported role as a cofactor of enzymes, this response could have been due to a direct inhibitory effect, a variation in the bioavailability of other trace elements, or even the availability of CO2/SO4 through precipitation as Ba-carbonates and sulphates. The results showed that the addition of Ba modified the chemical equilibrium of the studied system by varying the soluble concentration of some TEs and therefore their bioavailability. The highest variation was detected in the soluble concentration of zinc, which increased as the amount of Ba increased. Although little research has shown that Ba has some utility in anaerobic processes, its addition must be carefully monitored to avoid an undesirable modification of the chemical equilibrium in the system.

AB - The sufficient presence of trace elements (TE) is essential for anaerobic digestion. Barium (Ba) is considered a non-essential trace element that can be collaterally added to digesters as part of low-cost trace element sources or because of its presence in some feedstocks, such as crude glycerol. In the present study, the impact of Ba supplementation (2–2000 mg/L) on each stage of the anaerobic digestion (AD) process was evaluated using pure substrates (i.e., cellulose, glucose, a mixture of volatile fatty acids, sodium acetate and hydrogen) as well as a complex substrate (i.e., dried green fodder). Hydrolytic activity was affected at dosages higher than 200 mg Ba/L, whereas cellulose degradation was completely inhibited at 2000 mg Ba/L. The negative effects of the addition of Ba to methane production were observed only in the hydrolytic activity, and no effects were detected at any barium dosage in the subsequent anaerobic steps. Because Ba does not have a reported role as a cofactor of enzymes, this response could have been due to a direct inhibitory effect, a variation in the bioavailability of other trace elements, or even the availability of CO2/SO4 through precipitation as Ba-carbonates and sulphates. The results showed that the addition of Ba modified the chemical equilibrium of the studied system by varying the soluble concentration of some TEs and therefore their bioavailability. The highest variation was detected in the soluble concentration of zinc, which increased as the amount of Ba increased. Although little research has shown that Ba has some utility in anaerobic processes, its addition must be carefully monitored to avoid an undesirable modification of the chemical equilibrium in the system.

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KW - Metal bioavailability

KW - Trace element dosing

KW - Trace elements

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DO - 10.1016/j.jenvman.2018.11.065

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SP - 397

EP - 403

JO - Journal of Environmental Management

T2 - Journal of Environmental Management

JF - Journal of Environmental Management

SN - 0301-4797

ER -

Wyman V, Serrano A, Borja R, Jiménez A, Carvajal A, Lenz M et al. Effects of barium on the pathways of anaerobic digestion. Journal of Environmental Management. 2019 Feb 15;232:397-403. https://doi.org/10.1016/j.jenvman.2018.11.065