Synergetic effect of combined ensiling of freshly harvested and excessively wilted maize stover for efficient biogas production

Sun, Hui; Cui, Xian; Stinner, Walter; Shah, Ghulam Mustafa; Cheng, Huicai; Shan, Shengdao; Guo, Jianbin; Dong, Renjie

doi:10.1016/j.biortech.2019.121338

Cited by 31 publications

(12 citation statements)

References 45 publications

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“…That is why many biogas plant operators started to look for alternative substrates which can be easy to get, are inexpensive, and have good methane productivity. Maize straw can be one of these substrates, which has also been confirmed by Chinese experiences [7,46].…”

Section: Introductionmentioning

confidence: 62%

“…In the last decade, global maize grain production has increased by around 40%, and now amounts to almost 1100 million tonnes [4]. In 2017, EU maize grain production was over 70 million tonnes [5], and for comparison in Beijing in 2012 alone, 1.20 million tonnes maize straw was produced [6], and all over China more than 2.7 × 10 8 tonnes has been produced annually [7]. Such a high production of maize grain causes crop residues, such as leaves, stalks, husks, and cobs, which can constitute up to 50% of the dry matter yield of whole maize plants [8,9].…”

Section: Introductionmentioning

confidence: 99%

“…The fractions mentioned above have different chemical compositions, structure, and fiber properties [10,11], harvesting times, and even topography or soil types [12,13]. For example, sufficient storage as a result of ensiling operations enables 1.1%–2.2% reduced loss of organic matter compared to in open-air storage (63.1%) [7].…”

Section: Introductionmentioning

confidence: 99%

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Maize Straw as a Valuable Energetic Material for Biogas Plant Feeding

et al. 2019

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Maize has great potential, especially as a substrate for biofuels production. The aim of this paper is to analyze the possibility of usage in methane fermentation maize straw harvested in different weather conditions, which had an influence on different physical parameters, mainly the dry mass content. The research has shown that maize straw harvested in Central-Eastern Europe can have a broad spectrum of dry mass content, which is related to diverse weather conditions during autumn. However, independently from moisture content, maize straw can be a good (for more wet material) or very good (for more dried straw) substrate for the biogas plant. With the methane productivity reaching 201–207 m3/Mg of fresh mass, this material is a significantly better substrate than that typically used in Europe maize silage (approximately 105 m3/Mg FM). It was noted that the retention time for maize straw (36–42 days) is longer than in the case of maize silage (less than 30 days). However, this difference is quite small and can be accepted by the biogas plant operators.

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Section: Introductionmentioning

confidence: 62%

Section: Introductionmentioning

confidence: 99%

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Maize Straw as a Valuable Energetic Material for Biogas Plant Feeding

et al. 2019

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“…Biological pretreatment is to destroy the cell wall structure of biomass by the metabolic activity of microorganisms, which has the characteristics of mild use conditions, low cost, and has great potential in the field of biomass pretreatment [13]. Compared with chemical methods, biological methods do not need to consume a large amount of energy and recover chemical reagents, nor produce harmful inhibitors in the reaction system [14]. In parallel, microbes have evolved mechanisms, including cellulose-degrading enzymes, to degrade plant cell walls to access the plants' nutritious sugars.…”

Section: Introductionmentioning

confidence: 99%

Solid-State Anaerobic Microbial Ensilage Pretreatment

Xu¹

2021

Biogas - Recent Advances and Integrated Approaches

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Pretreatment technology has become the main bottleneck restricting the development of biogas. This chapter provides an overview of recent studies on solid-state microbial ensilage pretreatment for the production of biogas with wastes. The goal of microbial ensilage pretreatment is to maximize the production of lactic acid, thereby reducing the pH value and establishing an environment that is not suitable for the growth of harmful organisms. The use of various additives, especially lactic acid bacteria, is the main factor to ensure the success of anaerobic pretreatment. Sensory evaluation is carried out by observing the smell, structure, and color of silage to judge the quality of silage. The pH values, ammonia nitrogen, and organic acids (lactic-, acetic-, propionic-, and butyric acid) are used as reference values to determine the fermentation quality of silage. An overall comparison of the effectiveness of microbial ensilage with aerobic microbial pretreatment for biogas production is also discussed. Finally, the research on solid-state anaerobic microbial silage pretreatment in biogas conversion is summarized. The combined anaerobic digestion method with different pretreated materials will be the future development direction due to its advantages.

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“…This achieves a lower organic matter (OM) loss in comparison to hay or open-air storage. , However, in other maize grain production regions (e.g., northern China), the maize grain and stover are harvested and transported separately . In this case, the stover experiences different degrees of wilting in a process that can last from 20 days to several months during the harvesting season before it serves as an available feedstock for biogas production . The ensiling of wilted maize stover (WMS) for biogas production is difficult, and much of the OM is lost due to the rather low WSC or LAB contents that result from the wilting process .…”

Section: Introductionmentioning

confidence: 99%

Butyric Acid Fermentation during Ensiling of Wilted Maize Stover for Efficient Methane Production

Cui

Sun

Sobhi

et al. 2020

ACS Sustainable Chem. Eng.

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The performance of conventional processes for ensiling crop residues for biogas production is usually enhanced with lactic acid fermentation to reduce organic matter (OM) loss. In this study, butyric acid fermentation in the ensiling process of wilted maize stover (WMS) with glucose was directly and indirectly enhanced with Clostridium tyrobutyricum (Glu-CT) and CaCO3 (Glu-CaCO3), respectively. The effect of butyric acid fermentation and lactic acid fermentation during ensiling on the subsequent biogas production was investigated. Butyric acid fermentation was successfully enhanced in the Glu-CaCO3 treatment but not in the Glu-CT treatment. Analysis of storage performance and microbial activity revealed that enhanced butyric acid fermentation triggered synergetic acid hydrolysis and enzymolysis during ensiling and increased the biodegradability of the WMS. The specific methane yield (methane yieldmeasured) and methane yieldorig (corrected with storage loss) of the 60 d of ensiled WMS in the Glu-CaCO3 treatment increased by 20.1% and 10.4%, respectively, compared to the values on day 0, which were significantly higher than that of WMS subjected to lactic acid treatment (P < 0.05). The trade-off between OM loss and increased methane yield was positive when the butyric acid fermentation was enhanced during ensiling. Hence, the criteria for conventional ensiling of WMS for biogas production could be reconsidered.

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Synergetic effect of combined ensiling of freshly harvested and excessively wilted maize stover for efficient biogas production

Cited by 31 publications

References 45 publications

Maize Straw as a Valuable Energetic Material for Biogas Plant Feeding

Maize Straw as a Valuable Energetic Material for Biogas Plant Feeding

Solid-State Anaerobic Microbial Ensilage Pretreatment

Butyric Acid Fermentation during Ensiling of Wilted Maize Stover for Efficient Methane Production

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