Fungal pretreatment of non-sterile maize silage and solid digestate with a Cephalotrichum stemonitis strain selected from agricultural biogas plants to enhance anaerobic digestion

Zanellati, Andrea; Spina, Federica; Poli, A.; Rolle, Luca Giorgio Carlo; Varese, Giovanna Cristina; Dinuccio, Elio

doi:10.1016/j.biombioe.2020.105934

Cited by 13 publications

(4 citation statements)

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“…The pH of the digestate after sterilization was 11.4, while the optimal reported pH for P. ostreatus and S. rugosoannulata are 6.5-8.7 and 6.5-7.5, respectively [13]. In the studies by Zanellati et al (2020 and [71,72], however, the pH of SFD was lower, between 8.4 and 9.4 and a slight acidification was observed after treatment. The C/N of the SFD studied by Brémond et al (2020) [13] was 23.6, which might not have been high enough to promote enzymes excretion.…”

Section: Microbial Aerobic Post-treatmentmentioning

confidence: 89%

“…Interestingly, Zanellati et al (2020 and 2021) [71,72] reported successful fungal treatments over 10-20 days even when employing non-sterilized SFD. Methane yields increments ranged between 72% and 214% when treating SFD with Cephalotrichum stemonitis, Coprinopsis cinerea, and Cyclocybe aegerita.…”

Section: Microbial Aerobic Post-treatmentmentioning

confidence: 99%

“…For instance, the optimal C/N ratio for S. rugosoannulata is 50-100 [13]. The C/N ratios from the studies by Zanellati et al (2020 and [71,72] were not reported, but an ammonia stripping step prior to fungal inoculation was performed, which should have lowered N levels, allowing the C/N ratios to approach optimal ranges. The potential of fungi as a post-treatment method is therefore still not clear, and will require future tests at conditions optimal to fungal growth.…”

Section: Microbial Aerobic Post-treatmentmentioning

confidence: 99%

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Digestate Post-Treatment Strategies for Additional Biogas Recovery: A Review

Romio¹,

Møller²

2021

Sustainability

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Anaerobic digestion (AD) is a process in which microorganisms, under oxygen-free conditions, convert organic matter into biogas and digestate. Normally, only 40–70% of biomass is converted into biogas; therefore, digestate still contains significant amounts of degradable organic matter and biogas potential. The recovery of this residual biogas potential could optimize substrate utilization and lower methane emissions during digestate storage and handling. Post-treatment methods have been studied with the aim of enhancing the recovery of biogas from digestate. This review summarizes the studies in which these methods have been applied to agricultural and wastewater digestate and gives a detailed overview of the existing scientific knowledge in the field. The current studies have shown large variation in outcomes, which reflects differences in treatment conditions and digestate compositions. While studies involving biological post-treatment of digestate are still limited, mechanical methods have been relatively more explored. In some cases, they could increase methane yields of digestate; however, the extra gain in methane has often not covered treatment energy inputs. Thermal and chemical methods have been studied the most and have yielded some promising results. Despite all the research conducted in the area, several knowledge gaps still should be addressed. For a more thorough insight of the pros and cons within post-treatment, more research where the effects of the treatments are tested in continuous AD systems, along with detailed economic analysis, should be performed.

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Section: Microbial Aerobic Post-treatmentmentioning

confidence: 89%

Section: Microbial Aerobic Post-treatmentmentioning

confidence: 99%

Section: Microbial Aerobic Post-treatmentmentioning

confidence: 99%

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Digestate Post-Treatment Strategies for Additional Biogas Recovery: A Review

Romio¹,

Møller²

2021

Sustainability

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“…Sameh et al [16] used new composite microorganisms to pretreat wood chips before anaerobic fermentation, increasing the cumulative gas production and methane production by 86.4% and 92.2%, respectively, compared with the control group. Zanellati et al [17] extracted and screened composite microorganisms from unsterilized corn silage, and the cumulative methane production from the digestive liquid increased by 70% after pretreatment. A novel microbiome used by Ali et al [18], CS-5 and BC-4, increased cumulative and methane production by 76.3% and 64.3%, respectively.…”

Section: Introductionmentioning

confidence: 99%

Enhancement of Anaerobic Digestion of Corn Straw: Effect of Biological Pretreatment and Heating with Bio-Heat Recovery from Pretreatment

Guan,

He,

et al. 2024

Fermentation

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Biological pretreatment can promote the degradation of biomass and enhance methane production via the subsequent anaerobic digestion. In addition, a large amount of bio-heat can be generated during the pretreatment process to provide heat for the anaerobic digestion process. In this study, composite microorganisms were employed for pretreating corn straw. The impact of different pretreatment times and the heat generated by the pretreatment process on subsequent anaerobic digestion were studied. The results show that the maximum temperature of the pretreatment process was 56.2 °C, obtained on day 6. After 14 days of pretreatment, the degradation rate of the pretreatment group increased by 41% compared with the control group. As a consequence, straws with different pretreatment times were used for anaerobic digestion. The group that underwent 6 days of pretreatment and utilized bio-heat generated from pretreatment achieved the highest cumulative methane production of 401.58 mL/g VS, which was 60.13% higher than in the control group without pretreatment. After 6 days of composite microorganism pretreatment, the group that utilized bio-heat achieved a 29.08% increase in cumulative methane production compared to the group that did not utilize bio-heat. In conclusion, this study highlights the potential of biological pretreatment with composite microorganisms followed by anaerobic digestion using bio-heat as an effective method for treating corn straw.

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