A comparative study of artificial cow and sheep rumen fermentation of corn straw and food waste: Batch and continuous operation

Xing, Bao-Shan; Cao, Sifan; Han, Yule; Wang, Xiaochang C.; Wen, Jiaming; Zhang, Kaidi

doi:10.1016/j.scitotenv.2020.140731

Cited by 27 publications

(11 citation statements)

References 41 publications

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“…1B). pH around 5.0 is within reported inhibitory levels (Xing et al, 2020). However, the steady accumulation of VFAs until day 8 indicates that the fermentation process was not severely inhibited under these conditions.…”

Section: Resultssupporting

confidence: 74%

Assessing the potential of waste activated sludge and food waste co-fermentation for carboxylic acids production

Vidal-Antich

Perez-Esteban

Astals

et al. 2021

Science of The Total Environment

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Section: Resultssupporting

confidence: 74%

Assessing the potential of waste activated sludge and food waste co-fermentation for carboxylic acids production

Vidal-Antich

Perez-Esteban

Astals

et al. 2021

Science of The Total Environment

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“…However, the microbial community in the rumen AnDMBR were less diverse compared to the rumen inoculum as indicated by the decreased Shannon Diversity Indices, consistent with other studies simulating cow rumen (Figure 2 and S3). 40,42,76 Moreover, the microbial community structure and activity in the rumen AnDMBR were statistically significantly different from the one in the rumen content (p=0.003 for relative activity and p=0.014 for relative abundance) (Figure 4 and S11). For example, Prevotella and Succinivibrionaceae, who were abundant and active in the rumen inoculum gradually disappeared from the rumen AnDMBR (Figure 2 and S3).…”

Section: The Rumen Andmbr Permeate Provides Versatile Downstream Trea...mentioning

confidence: 92%

Simulating Rumen Conditions using an Anaerobic Dynamic Membrane Bioreactor to Enhance Hydrolysis of Lignocellulosic Biomass

Fonoll

Zhu

Aley

et al. 2023

Preprint

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An anaerobic dynamic membrane bioreactor (AnDMBR) was used to mimic rumen conditions to enhance the hydrolysis of lignocellulosic materials and the production of volatile fatty acids (VFA) when treating food waste. The AnDMBR was inoculated with cow rumen content and operated at a 0.5-day hydraulic retention time, 2 to 4-day solids retention time, a temperature of 39 °C, and a pH of 6.3, characteristics similar to those of a rumen. An operational strategy of repeating settle-permeate-mix cycles was utilized to simulate the regurgitation of ruminant animals. Removal rates of neutral detergent fiber (NDF) and acid detergent fiber (ADF) of 58.9 ± 8.4 % and 69.0 ± 8.6 %, respectively, and a VFA yield of 0.55 ± 0.12 g VFA/g CODfed were observed when operating at an organic loading rate of 18 ± 2 kg VS/m3/day. Sequencing results of both 16S rRNA gene and 16S rRNA revealed that a microbial community resistant to both disruption and reinoculation developed six weeks after inoculation. Up to 66.7 ± 5.7 % of the active microbial populations (based on 16S rRNA sequence data) and 51.0 ± 7.0 % of the total microbial populations (based on 16S rRNA gene sequence data) present in the rumen-mimicking AnDMBR originated from the rumen inoculum. This study offers a reliable strategy to leverage the unique features of a rumen; the rumen-mimicking AnDMBR achieved high hydrolysis and acidogenesis rates even when treating substrates drastically different from those fed to ruminants.

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“…Considerable value can be achieved by maximizing the use of the natural microbial community and applying it to practical production [6]. In recent years, rumen uid has usually been directly used as an inoculum in the anaerobic digestion to improve the fermentation e ciency of lignocellulosic biomass [7]. The research focuses mainly about improving the fermentation e ciency by optimizing the reaction conditions, such as pH, solid-liquid ratio, and preservation method [8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Comparative contribution of substrate structure and microbial composition to volatile fatty acid production in the fermentation of corn stover

Zhang

Cao

et al. 2023

Preprint

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Rumen fluid is anatural and green catalyst that can efficiently degrade biomass into volatile fatty acid (VFA) which can be used toproducevalue-addedmaterials. But the essence of high degradation efficiency in the rumen has not been fully analyzed. This study comparativelyinvestigated the contribution of substrate structure and microbial composition to volatile fatty acid production in the fermentation of corn stover. The ball milled corn stover were innovatively applied to ferment with the rumen fluid collected at different digestion times. And exogeneous cellulaseaddition were also applied to the ruminal fermentation to further reveal the inner mechanism. With prolonged digestion time, the microbial community relative abundance levels of Bacteroidetesand Firmicutes increased from 29.98% to 72.74% and decreased from 51.76% to 22.11%, respectively. The highest VFA production of the corn stover was achieved via treatment with the rumen fluid collected at 24 h which was up to 9508 mg/L. The ball milled corn stover achieved high VFA production because of the more accessible substrate structure. The application of exogenous cellulasehas no significant influenceto the ruminal fermentation. The microbial community abundance contributed more to the VFA production compared with the substrate structures.

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A comparative study of artificial cow and sheep rumen fermentation of corn straw and food waste: Batch and continuous operation

Cited by 27 publications

References 41 publications

Assessing the potential of waste activated sludge and food waste co-fermentation for carboxylic acids production

Assessing the potential of waste activated sludge and food waste co-fermentation for carboxylic acids production

Simulating Rumen Conditions using an Anaerobic Dynamic Membrane Bioreactor to Enhance Hydrolysis of Lignocellulosic Biomass

Comparative contribution of substrate structure and microbial composition to volatile fatty acid production in the fermentation of corn stover

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