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Open AccessArticle

Dry Anaerobic Digestion of Food and Paper Industry Wastes at Different Solid Contents

1
Swedish Centre for Resource Recovery, University of Borås, SE 50190 Borås, Sweden
2
Department of Built Environment and Energy Technology, Linnaeus University, SE 352 52 Växjö, Sweden
3
Department of Chemical and Polymer Engineering, Faculty of Engineering, Lagos State University, Lagos 100268, Nigeria
*
Author to whom correspondence should be addressed.
Fermentation 2019, 5(2), 40; https://doi.org/10.3390/fermentation5020040
Received: 16 April 2019 / Revised: 3 May 2019 / Accepted: 10 May 2019 / Published: 14 May 2019
(This article belongs to the Special Issue Fermentation Process in Biorefinery)
A large volume of food is being wasted every year, while the pulp and paper industry also generate a large amount of solid wastes on a daily basis, causing environmental challenges around the world. Dry anaerobic digestion (AD) of these solid wastes is a cost-effective method for proper management. However, dry digestion of these waste streams has been restricted due to their complex structure, the presence of possible inhibitors and inappropriate operating conditions. In light of this fact, dry digestion of food waste (FW) and paper wastes (PW) was conducted at different total solid (TS) concentrations of reactor mixtures of 14%, 16%, 18% and 20% TS, corresponding to substrate to inoculum (S/I) ratio of 0.5 and 1; investigating the optimum operating conditions for effective dry digestion of these complex wastes. The highest methane yields of 402 NmlCH4/gVS and 229 NmlCH4/gVS were obtained from digestion of FW and PW, respectively at 14%TS corresponding to an S/I ratio of 0.5. Increasing the S/I ratio from 0.5 to 1 and thereby having a TS content of 20% in the reactor mixtures was unfavorable to the digestion of both substrates. View Full-Text
Keywords: dry anaerobic digestion; food waste; paper waste; biogas; digestate dry anaerobic digestion; food waste; paper waste; biogas; digestate
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Jansson, A.T.; Patinvoh, R.J.; Sárvári Horváth, I.; Taherzadeh, M.J. Dry Anaerobic Digestion of Food and Paper Industry Wastes at Different Solid Contents. Fermentation 2019, 5, 40.

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