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Article

Continuous Anaerobic Co-Digestion of Biowaste with Crude Glycerol under Mesophilic Conditions

1
Department of Waste and Resource Management, Faculty of Agricultural and Environmental Sciences, University of Rostock, D-18059 Rostock, Germany
2
Deutsches Biomasseforschungszentrum gGmbH, D-04347 Leipzig, Germany
*
Author to whom correspondence should be addressed.
Sustainability 2020, 12(22), 9512; https://doi.org/10.3390/su12229512
Received: 28 September 2020 / Revised: 7 November 2020 / Accepted: 11 November 2020 / Published: 15 November 2020
(This article belongs to the Special Issue Sustainable Waste Technology and Management)
A persistent topic of the anaerobic digestion of biowaste is the efficient use of co-substrates. According to Renewable Energy Sources Act the co-substrate input is limited to 10 percent of the average daily substrate feed in Germany. In this concern, the primary focus of this paper is to understand the suitability of crude glycerol in anaerobic digestion of biowaste. Two identical lab-scale anaerobic digester units were added with crude glycerol, and each unit was equipped with four identical fermenters. Unit A was fed with an average organic loading rate of 4.5 kg VS m−3 d−1, and the average organic loading rate of unit B was set at 5.5 kg VS m−3 d−1. The share of crude glycerol in the total feed was 0.77 percent of the fresh matter. The abort criterion is a ratio of the volatile organic acids and buffer capacity (FOS/TAC) in the fermenter above 1.2. The abort criterion was reached after 16 days. In summary, the results lead us to the conclusion crude glycerol is not suitable as a co-substrate for anaerobic digestion for several reasons. View Full-Text
Keywords: biowaste; crude glycerol; co-digestion; biodiesel biowaste; crude glycerol; co-digestion; biodiesel
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MDPI and ACS Style

Sprafke, J.; Shettigondahalli Ekanthalu, V.; Nelles, M. Continuous Anaerobic Co-Digestion of Biowaste with Crude Glycerol under Mesophilic Conditions. Sustainability 2020, 12, 9512. https://doi.org/10.3390/su12229512

AMA Style

Sprafke J, Shettigondahalli Ekanthalu V, Nelles M. Continuous Anaerobic Co-Digestion of Biowaste with Crude Glycerol under Mesophilic Conditions. Sustainability. 2020; 12(22):9512. https://doi.org/10.3390/su12229512

Chicago/Turabian Style

Sprafke, Jan, Vicky Shettigondahalli Ekanthalu, and Michael Nelles. 2020. "Continuous Anaerobic Co-Digestion of Biowaste with Crude Glycerol under Mesophilic Conditions" Sustainability 12, no. 22: 9512. https://doi.org/10.3390/su12229512

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