Application of Aqueous Ammonia Soaking for enhancement of methane potential of swine manure fibers

Esperanza Jurado, Hariklia N. Gavala, Ioannis Skiadas

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Abstract

Purpose: Increasing the methane productivity of manure based biogas plants is challenging because the solid fraction of manure contains lignocellulosic fibers, which are difficult to biodegrade and thus make anaerobic digestion process slow and economically unfavourable. Therefore, pretreatment of the solid fraction is a prerequisite for increasing its digestibility. The purpose of the present study was to evaluate aqueous ammonia soaking (AAS) and subsequent ammonia removal as a pretreatment method for increasing methane potential and biogas productivity of raw and digested manure fibers.
Methods: Manure fibers were pretreated with AAS for 3 days at 22°C and methane production was evaluated in batch experiments (methane potential tests).
Results: It was proven that AAS altered the lignocellulosic structure increasing significantly the concentration of soluble organic material. AAS pretreatment resulted at a 40-80% and 170% increase in methane yield from digested and raw manure fibers, respectively. Moreover, methane potential was evaluated at different organic loadings to test potential inhibition phenomena. Four different TS loadings were tested: 0.16, 0.25, 0.5 and 1 g TS per 10 ml of inoculum. No inhibition was observed for the digested fibers at the loadings tested while raw fibers exhibited slight inhibition only at very high loadings.
Main conclusions: In the present study, AAS was successfully applied as a pretreatment method to increase methane potential of swine manure fibers. Batch anaerobic digestion of AAS-treated digested manure fibers could stand loadings as high as 100 g TS / L inoculum with no inhibition problems.
Original languageEnglish
Title of host publicationProceedings of the 4th International Conference on Engineering for Waste and Biomass Valorisation (WasteEng12), Porto (Portugal), September 10-13
Number of pages6
Volume2
PublisherIWWG-International Waste Working Group, Hamburg University of Technology
Publication date2012
Pages389-394
ISBN (Electronic)979-10-91526-00-5
Publication statusPublished - 2012
Event4th International Conference on Engineering for Waste and Biomass Valorisation - Porto, Portugal
Duration: 10 Sep 201213 Sep 2012
Conference number: 4

Conference

Conference4th International Conference on Engineering for Waste and Biomass Valorisation
Number4
CountryPortugal
CityPorto
Period10/09/201213/09/2012

Fingerprint

Manure
Methane
Ammonia
Swine
Biofuels
Digestion

Keywords

  • manure fibers, aqueous ammonia soaking, anaerobic digestion, pretreatment, methane potential

Cite this

Jurado, E., Gavala, H. N., & Skiadas, I. (2012). Application of Aqueous Ammonia Soaking for enhancement of methane potential of swine manure fibers. In Proceedings of the 4th International Conference on Engineering for Waste and Biomass Valorisation (WasteEng12), Porto (Portugal), September 10-13 (Vol. 2, pp. 389-394). IWWG-International Waste Working Group, Hamburg University of Technology.
Jurado, Esperanza ; Gavala, Hariklia N. ; Skiadas, Ioannis. / Application of Aqueous Ammonia Soaking for enhancement of methane potential of swine manure fibers. Proceedings of the 4th International Conference on Engineering for Waste and Biomass Valorisation (WasteEng12), Porto (Portugal), September 10-13. Vol. 2 IWWG-International Waste Working Group, Hamburg University of Technology, 2012. pp. 389-394
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title = "Application of Aqueous Ammonia Soaking for enhancement of methane potential of swine manure fibers",
abstract = "Purpose: Increasing the methane productivity of manure based biogas plants is challenging because the solid fraction of manure contains lignocellulosic fibers, which are difficult to biodegrade and thus make anaerobic digestion process slow and economically unfavourable. Therefore, pretreatment of the solid fraction is a prerequisite for increasing its digestibility. The purpose of the present study was to evaluate aqueous ammonia soaking (AAS) and subsequent ammonia removal as a pretreatment method for increasing methane potential and biogas productivity of raw and digested manure fibers. Methods: Manure fibers were pretreated with AAS for 3 days at 22°C and methane production was evaluated in batch experiments (methane potential tests). Results: It was proven that AAS altered the lignocellulosic structure increasing significantly the concentration of soluble organic material. AAS pretreatment resulted at a 40-80{\%} and 170{\%} increase in methane yield from digested and raw manure fibers, respectively. Moreover, methane potential was evaluated at different organic loadings to test potential inhibition phenomena. Four different TS loadings were tested: 0.16, 0.25, 0.5 and 1 g TS per 10 ml of inoculum. No inhibition was observed for the digested fibers at the loadings tested while raw fibers exhibited slight inhibition only at very high loadings. Main conclusions: In the present study, AAS was successfully applied as a pretreatment method to increase methane potential of swine manure fibers. Batch anaerobic digestion of AAS-treated digested manure fibers could stand loadings as high as 100 g TS / L inoculum with no inhibition problems.",
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author = "Esperanza Jurado and Gavala, {Hariklia N.} and Ioannis Skiadas",
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Jurado, E, Gavala, HN & Skiadas, I 2012, Application of Aqueous Ammonia Soaking for enhancement of methane potential of swine manure fibers. in Proceedings of the 4th International Conference on Engineering for Waste and Biomass Valorisation (WasteEng12), Porto (Portugal), September 10-13. vol. 2, IWWG-International Waste Working Group, Hamburg University of Technology, pp. 389-394, 4th International Conference on Engineering for Waste and Biomass Valorisation , Porto, Portugal, 10/09/2012.

Application of Aqueous Ammonia Soaking for enhancement of methane potential of swine manure fibers. / Jurado, Esperanza; Gavala, Hariklia N.; Skiadas, Ioannis.

Proceedings of the 4th International Conference on Engineering for Waste and Biomass Valorisation (WasteEng12), Porto (Portugal), September 10-13. Vol. 2 IWWG-International Waste Working Group, Hamburg University of Technology, 2012. p. 389-394.

Research output: Contribution to book/anthology/report/conference proceedingArticle in proceedingResearchpeer-review

TY - GEN

T1 - Application of Aqueous Ammonia Soaking for enhancement of methane potential of swine manure fibers

AU - Jurado, Esperanza

AU - Gavala, Hariklia N.

AU - Skiadas, Ioannis

PY - 2012

Y1 - 2012

N2 - Purpose: Increasing the methane productivity of manure based biogas plants is challenging because the solid fraction of manure contains lignocellulosic fibers, which are difficult to biodegrade and thus make anaerobic digestion process slow and economically unfavourable. Therefore, pretreatment of the solid fraction is a prerequisite for increasing its digestibility. The purpose of the present study was to evaluate aqueous ammonia soaking (AAS) and subsequent ammonia removal as a pretreatment method for increasing methane potential and biogas productivity of raw and digested manure fibers. Methods: Manure fibers were pretreated with AAS for 3 days at 22°C and methane production was evaluated in batch experiments (methane potential tests). Results: It was proven that AAS altered the lignocellulosic structure increasing significantly the concentration of soluble organic material. AAS pretreatment resulted at a 40-80% and 170% increase in methane yield from digested and raw manure fibers, respectively. Moreover, methane potential was evaluated at different organic loadings to test potential inhibition phenomena. Four different TS loadings were tested: 0.16, 0.25, 0.5 and 1 g TS per 10 ml of inoculum. No inhibition was observed for the digested fibers at the loadings tested while raw fibers exhibited slight inhibition only at very high loadings. Main conclusions: In the present study, AAS was successfully applied as a pretreatment method to increase methane potential of swine manure fibers. Batch anaerobic digestion of AAS-treated digested manure fibers could stand loadings as high as 100 g TS / L inoculum with no inhibition problems.

AB - Purpose: Increasing the methane productivity of manure based biogas plants is challenging because the solid fraction of manure contains lignocellulosic fibers, which are difficult to biodegrade and thus make anaerobic digestion process slow and economically unfavourable. Therefore, pretreatment of the solid fraction is a prerequisite for increasing its digestibility. The purpose of the present study was to evaluate aqueous ammonia soaking (AAS) and subsequent ammonia removal as a pretreatment method for increasing methane potential and biogas productivity of raw and digested manure fibers. Methods: Manure fibers were pretreated with AAS for 3 days at 22°C and methane production was evaluated in batch experiments (methane potential tests). Results: It was proven that AAS altered the lignocellulosic structure increasing significantly the concentration of soluble organic material. AAS pretreatment resulted at a 40-80% and 170% increase in methane yield from digested and raw manure fibers, respectively. Moreover, methane potential was evaluated at different organic loadings to test potential inhibition phenomena. Four different TS loadings were tested: 0.16, 0.25, 0.5 and 1 g TS per 10 ml of inoculum. No inhibition was observed for the digested fibers at the loadings tested while raw fibers exhibited slight inhibition only at very high loadings. Main conclusions: In the present study, AAS was successfully applied as a pretreatment method to increase methane potential of swine manure fibers. Batch anaerobic digestion of AAS-treated digested manure fibers could stand loadings as high as 100 g TS / L inoculum with no inhibition problems.

KW - manure fibers, aqueous ammonia soaking, anaerobic digestion, pretreatment, methane potential

M3 - Article in proceeding

VL - 2

SP - 389

EP - 394

BT - Proceedings of the 4th International Conference on Engineering for Waste and Biomass Valorisation (WasteEng12), Porto (Portugal), September 10-13

PB - IWWG-International Waste Working Group, Hamburg University of Technology

ER -

Jurado E, Gavala HN, Skiadas I. Application of Aqueous Ammonia Soaking for enhancement of methane potential of swine manure fibers. In Proceedings of the 4th International Conference on Engineering for Waste and Biomass Valorisation (WasteEng12), Porto (Portugal), September 10-13. Vol. 2. IWWG-International Waste Working Group, Hamburg University of Technology. 2012. p. 389-394