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. 2022 Oct 2;27(19):6509.
doi: 10.3390/molecules27196509.

Methane Production Characteristics of an Anaerobic Co-Digestion of Pig Manure and Fermented Liquid Feed

Farida Hanum  1   2 , Yoichi Atsuta  3 , Hiroyuki Daimon  1   3
Affiliations

Methane Production Characteristics of an Anaerobic Co-Digestion of Pig Manure and Fermented Liquid Feed

Farida Hanum et al. Molecules. .

Abstract

Methane production characteristics of anaerobic co-digestion of pig manure (PM) and fermented liquid feed (FLF) were investigated in a continuous digester under mesophilic conditions. The experiment followed three phases. PM alone was digested in phase I. In phases II and III, PM and FLF were mixed in a ratio of 95:5 and 90:10 (% v/v), respectively. The specific methane yields (SMYs) during phases I, II, and III were 238, 278, and 326.8 mLCH4·gVS-1-added, respectively. It was due to the effect of balancing the feedstock carbon-to-nitrogen ratio by adding FLF. This improvement can also be attributed to the readily biodegradable compounds in the FLF. The higher SMY obtained in this study showed a positive synergistic effect in the anaerobic co-digestion of PM and FLF. The results also indicate that adding the FLF positively affected and maintained a constant pH level, avoiding volatile fatty acid accumulation and ammonia inhibition in the anaerobic digestion (AD). Thus, this study provides valuable information regarding the usage of unused or wasted FLF as a co-substrate for the practical AD of PM. The production of fermented liquid additives such as FLF to improve the methane production from the AD of PM is a potential novel alternative to food waste recycling in Japan, besides compost and animal feeding.

Keywords: anaerobic co-digestion; co-substrate; fermented liquid feed; methane production; pig manure.

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Conflict of interest statement

The authors declare no conflict of interest.

Figures

Figure 1
Figure 1
pH values during anaerobic digestion process.
Figure 2
Figure 2
Ammonia concentrations during anaerobic digestion process.
Figure 3
Figure 3
Volatile fatty acids concentrations during anaerobic digestion process.
Figure 4
Figure 4
Biogas production rate and percentage of methane and carbon dioxide in the produced biogas (A) biogas production rate, (B) percentage of methane and carbon dioxide.
Figure 5
Figure 5
Specific methane yield values at organic loading rate tested in this study.
Figure 6
Figure 6
Volatile solid removal during anaerobic digestion process.
See this image and copyright information in PMC

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