Effects of enzyme addition on biogas and methane yields in the batch anaerobic digestion of agricultural waste (silage, straw, and animal manure)

Weide, Tobias; Baquero, Carolina Duque; Schomaker, Marion; Brügging, Elmar; Wetter, Christof

doi:10.1016/j.biombioe.2019.105442

Cited by 39 publications

(16 citation statements)

References 28 publications

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“…Thus the yields are not comparable with this study. On the other hand, in another study, carried out in Zimbabwe, the biomethane production of tea residues after harvesting was evaluated [32]. According to the results, higher yields were observed compared to this study.…”

Section: Discussionmentioning

confidence: 50%

Comparative Assessment of Biogas Production Potential of the Most Abundant Agro-residues in Turkey

Özbayram¹,

İnce²

2021

Deu Muhendislik Fakultesi Fen Ve Muhendislik

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Recent energy policies promote energy generations from green resources to meet sustainability criteria. Since Turkey is one of the largest agricultural producers globally, it has great biogas production potential. This study aims to evaluate the biomethane yields of the most abundant agroresidues in Turkey and to assess their potentials for contribution to biogas production. Within this scope, sunflower heads, tea residues, cotton stalks, and crop residues; wheat, rye, and triticale straws were collected from different regions of Turkey. Anaerobic batch digesters were conducted to investigate the biomethane production of the selected feedstock and operated for 30 days at 37°C. Each setup was conducted in triplicates and methane productions were monitored online. The main methane production route of the inoculum was determined as acetoclastic methanogenesis while Cloacimonetes, Firmicutes, and Bacteroidetes composed the core bacterial phyla. The greatest methane yield was observed in the digesters operated with the wheat straw followed (164 NmL/gVSinfluent) by triticale straw and sunflower head. The lowest yields were calculated for the digesters fed with the cotton stalks (71 NmL/gVSinfluent). To increase the biomethane potential yields in the anaerobic digesters operated with agro-residues and to make the anaerobic digesters more feasible, operational conditions should be optimized and physico-chemical and biological pre-treatment techniques and/or bioaugmentation applications should be integrated into the systems.

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Section: Discussionmentioning

confidence: 50%

Comparative Assessment of Biogas Production Potential of the Most Abundant Agro-residues in Turkey

Özbayram¹,

İnce²

2021

Deu Muhendislik Fakultesi Fen Ve Muhendislik

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“…Detailed analyses of the substrate are provided in . No trace elements, nitrogen (N) or phosphorus (P) were added as the concentrations of these in the substrate met required standards for anaerobic processes , . Before feeding, the manure was pretreated thermally at 80 °C for 2 h to reduce the HCB.…”

Section: Methodsmentioning

confidence: 99%

“…This effluent has a pH of 7–8 and a carbonate buffer and therefore exhibits alkaline properties . Manure has similar properties and, in this study, the process was stabilized by using the liquid phase of separated pig manure (PM) for feeding the reactors. This also tested whether the use of liquid manure is suitable for DF.…”

Section: Introductionmentioning

confidence: 99%

Biohydrogen Production via Dark Fermentation with Pig Manure and Glucose Using pH‐Dependent Feeding

et al. 2020

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Process controls for mesophilic dark fermentation using a pH-dependent feeding strategy without NaOH addition were examined. One reactor utilizing microorganism holdback and two continuously stirred-tank reactors (CSTRs) with the same volume were employed. These were fed with pig manure and glucose as cosubstrates. Different hydraulic retention times were applied. The target pH was 5.5 within a limited range and controlled by varying organic loading rate. When the pH target interval was exceeded, the hydrogen production rate (HPR) decreased, and CH 4 was produced. A pH below the target interval had positive effects on the HPR.

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“…investigated the effects of five different enzymes on organic dry matter basis on the increase in biogas from the anaerobic degradation of various substrates such as silage, straw and manure of various animals. It was observed that these enzymes caused an increase in methane yield of between 0.3% and 21.1% 11 . In another study, Santos et al .…”

Section: Introductionmentioning

confidence: 92%

The effect of reduced graphene oxide addition on methane production from municipal organic solid waste

Gökçek

Muratçobanoğlu

et al. 2021

J of Chemical Tech & Biotech

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BACKGROUND Conductive materials have become the focus of recent studies to accelerate and stabilize the conversion of organic wastes to methane in anaerobic digestion processes. In this study, the effect of the addition of reduced graphene oxide (rGO) on biogas/biomethane production from municipal organic solid wastes in anaerobic batch reactors was investigated. In this context, the effect of loading ratios (0, 0.5, 1 and 2 gVS inoculum (gVS nutrient)−1) and rGO addition at different concentrations (0, 10, 20 and 30 mg L−1) was examined during a 45‐day study period. RESULTS The highest biogas production reached a level of 816 ± 14 mL (gVS)−1 when substrate/inoculum ratio was 1 and 20 mg L−1 rGO was added (50% more than the group without rGO added). Addition of 30 mg L−1 rGO resulted in 667 ± 12 mL (gVS)−1 corresponding to 23% higher biogas production compared to the control reactor without rGO. The highest cumulative biomethane production was observed to be 525 ± 20 mL (gVS)−1 in the reactor with 20 mg L−1 rGO added in which substrate/inoculum ratio was 1. In the reactors with 10 and 30 mg L−1 and without rGO addition biomethane productions were 448 ± 21, 401 ± 13 and 323 ± 23 mL (gVS)−1, respectively. CONCLUSIONS Results revealed that the addition of rGO increased biomethane production from municipal organic solid wastes. It is concluded that rGO addition has the potential to be applied for real‐scale facilities within the scope of renewable energy production and circular economy. © 2021 Society of Chemical Industry

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Effects of enzyme addition on biogas and methane yields in the batch anaerobic digestion of agricultural waste (silage, straw, and animal manure)

Cited by 39 publications

References 28 publications

Comparative Assessment of Biogas Production Potential of the Most Abundant Agro-residues in Turkey

Comparative Assessment of Biogas Production Potential of the Most Abundant Agro-residues in Turkey

Biohydrogen Production via Dark Fermentation with Pig Manure and Glucose Using pH‐Dependent Feeding

The effect of reduced graphene oxide addition on methane production from municipal organic solid waste

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