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Open AccessArticle

A Comparison of the Influence of Kraft Lignin and the Kraft Lignin/Silica System as Cell Carriers on the Stability and Efficiency of the Anaerobic Digestion Process

1
Department of Plant-Derived Food Technology, Poznań University of Life Sciences, ul. Wojska Polskiego 31, 60-624 Poznań, Poland
2
Department of General and Environmental Microbiology, Poznań University of Life Sciences, ul. Szydłowska 50, 60-656 Poznań, Poland
3
Department of Biosystems Engineering, Poznań University of Life Sciences, ul. Wojska Polskiego 50, 60-627 Poznań, Poland
4
Polbiotech Laboratorium Sp. z o.o., Poznań Science and Technology Park, ul. Rubież 46, 61-612 Poznań, Poland
*
Author to whom correspondence should be addressed.
Energies 2020, 13(21), 5803; https://doi.org/10.3390/en13215803
Received: 25 September 2020 / Revised: 30 October 2020 / Accepted: 3 November 2020 / Published: 6 November 2020
(This article belongs to the Collection Feature Papers in Bio-Energy)
This study compares the effects of pure kraft lignin and the kraft lignin/silica system (1:4 by weight). The comparative analysis of the physicochemical properties of both carriers showed that the kraft lignin/silica system was characterised by better properties. The experiment conducted in the study involved continuous anaerobic digestion under mesophilic conditions. Three samples were degraded in the following order: (i) sewage sludge (SS), (ii) SS with the addition of kraft lignin, and (iii) SS with the addition of the kraft lignin/silica system. A quantitative analysis of the digestate samples was carried out by means of in situ fluorescence. It showed more intense proliferation of microorganisms in the SS + kraft lignin/silica variant than in the sample with pure kraft lignin. The highest amount of biogas was obtained in the SS + kraft lignin/silica variant (689 m3 Mg−1 VS, including 413 m3 Mg−1 VS of methane; VS—volatile solids). There were comparable amounts of biogas in the SS variant (526 m3 Mg−1 VS of biogas, including 51% of methane) and the SS + kraft lignin variant (586 m3 Mg−1 VS of biogas, including 54% of methane). The research clearly showed that the material with a high share of silica was an effective cell carrier. View Full-Text
Keywords: kraft lignin; silica; microbial carriers; anaerobic digestion; process efficiency kraft lignin; silica; microbial carriers; anaerobic digestion; process efficiency
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MDPI and ACS Style

Pilarska, A.A.; Wolna-Maruwka, A.; Niewiadomska, A.; Pilarski, K.; Olesienkiewicz, A. A Comparison of the Influence of Kraft Lignin and the Kraft Lignin/Silica System as Cell Carriers on the Stability and Efficiency of the Anaerobic Digestion Process. Energies 2020, 13, 5803. https://doi.org/10.3390/en13215803

AMA Style

Pilarska AA, Wolna-Maruwka A, Niewiadomska A, Pilarski K, Olesienkiewicz A. A Comparison of the Influence of Kraft Lignin and the Kraft Lignin/Silica System as Cell Carriers on the Stability and Efficiency of the Anaerobic Digestion Process. Energies. 2020; 13(21):5803. https://doi.org/10.3390/en13215803

Chicago/Turabian Style

Pilarska, Agnieszka A.; Wolna-Maruwka, Agnieszka; Niewiadomska, Alicja; Pilarski, Krzysztof; Olesienkiewicz, Artur. 2020. "A Comparison of the Influence of Kraft Lignin and the Kraft Lignin/Silica System as Cell Carriers on the Stability and Efficiency of the Anaerobic Digestion Process" Energies 13, no. 21: 5803. https://doi.org/10.3390/en13215803

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