Characteristics of volatile fatty acids in stored dairy manure before and after anaerobic digestion

Page, Laura H.; Ni, Ji‐Qin; Heber, Albert J.; Mosier, Nathan S.; Liu, Xingya; Joo, Hung-Soo; Ndegwa, Pius M.; Harrison, J.A.

doi:10.1016/j.biosystemseng.2013.11.004

Cited by 56 publications

(29 citation statements)

References 30 publications

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“…The predominance of acetic acid in tVFA is similar to what other studies (Patni and Jui (1985) and Page et al (2014) found. Since acetic acid originates both from acidification and from degradations of propionate and butyrate (Nozhevnikova et al 2000), the increasing dominance of acetic acid may indicate kinetic instability between acid producing and consuming microbes (Ahring et al 1995).…”

Section: Volatile Fatty Acid Contents and Manure Decomposition Dynamicssupporting

confidence: 80%

Impact of manure storage conditions and time on decomposition and losses from liquid dairy manure stored in a temperate climate

et al. 2017

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Large volumes of generated animal manures necessitate knowledge of how its production and storage affects composition, losses, and utilization potential. Stratification of liquid dairy manure was the main source of observed variability within outdoor uncovered manure storage, during a yearlong monitoring of 24 physicochemical manure parameters. Coefficient of variation (CV) ranged from 4-24% for plant nutrients and 33-89% for biogas feedstock parameters. Nitrogen (N) volatilization losses during storage between manure additions were ~10% mo -1 of total Kjeldahl nitrogen (TKN). Acetic acid was up to 100% of total volatile fatty acid (tVFA) concentration. Bioavailability and solubility of manure parameters, reflected in ratios of volatile solids to total solids (VS:TS), total ammoniacal nitrogen to total Kjeldahl nitrogen (TAN:TKN), and dissolved phosphorus to total phosphorus (O-PO 4 :TP) ratios was high. There was substantial pathogen survival during the study with an increased count with added manure. Manure temperature changes and precipitation levels likely played a major role in mineralization and volatilization rates of nutrients and reduction of solids, especially in surface levels of manure in storage. Study results underline the importance of sampling method, timing, and location within stored manure to obtain representative samples unless thorough mixing is previously applied. Further work related to manure properties might benefit from a higher number of farms sampled, provided that consistency in sampling method and analysis is maintained to minimize errors and provide reliable results.

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Section: Volatile Fatty Acid Contents and Manure Decomposition Dynamicssupporting

confidence: 80%

Impact of manure storage conditions and time on decomposition and losses from liquid dairy manure stored in a temperate climate

et al. 2017

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“…Previously, CS has been studied to contain varying levels of VFAs depending on the TS content, storage time, and conditions as well as the individual acids analyzed. Stored CS has been reported to contain around 3 g/L of VFAs (Page et al, ) and stored solid manure 0.7 g VFAs/L (Kafle & Chen, ) and 0.25 g COD/kg (Cavinato, Da Ros, et al, ). The CS studied in the present study contained almost 7 g/L (8.6 g COD/kg) of VFAs, which was most likely due to the low TS content of the slurry (6%) as well as the longer storage times at the farm and one week of storage in a fridge before the analyses, which led to CS degradation and VFA formation.…”

Section: Discussionmentioning

confidence: 99%

“…Previously, CS has been studied to contain varying levels of VFAs depending on the TS content, storage time, and conditions as well as the individual acids analyzed. Stored CS has been reported to contain around 3 g/L of VFAs (Page et al, 2014) and stored solid manure 0.7 g VFAs/L (Kafle & Chen, 2016) and 0.25 g COD/kg . The CS studied F I G U R E 5 Canonical correspondence analysis (CCA) ordination diagrams showing the correlation between the relative abundance of archaea at the family level (a) and bacteria at the order level (b) and the performance variables (methane: cumulative daily methane yield in ml/g VS fed , Volatile fatty acids [VFAs]: acetic acid, propionic acid, butyric acid, isobutyric acid, valeric acid, isovaleric acid, and caproic acid in g/ L).…”

Section: Substrates and Inoculamentioning

confidence: 99%

Volatile fatty acids (VFAs) and methane from food waste and cow slurry: Comparison of biogas and VFA fermentation processes

et al. 2018

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The potential of various biomasses for the production of green chemicals is currently one of the key topics in the field of the circular economy. Volatile fatty acids (VFAs) are intermediates in the methane formation pathway of anaerobic digestion and they can be produced in similar reactors as biogas to increase the productivity of a digestion plant, as VFAs have more varying end uses compared to biogas and methane. In this study, the aim was to assess the biogas and VFA production of food waste (FW) and cow slurry (CS) using the anaerobic biogas plant inoculum treating the corresponding substrates. The biogas and VFA production of both biomasses were studied in identical batch scale laboratory conditions while the process performance was assessed with chemical and microbial analyses. As a result, FW and CS were shown to have different chemical performances and microbial dynamics in both VFA and biogas processes. FW as a substrate showed higher yields in both processes (435 ml CH4/g VSfed and 434 mg VFA/g VSfed) due to its characteristics (pH, organic composition, microbial communities), and thus, the vast volume of CS makes it also a relevant substrate for VFA and biogas production. In this study, VFA profiles were highly dependent on the substrate and inoculum characteristics, while orders Clostridiales and Lactobacillales were connected with high VFA and butyric acid production with FW as a substrate. In conclusion, anaerobic digestion supports the implementation of the waste management hierarchy as it enables the production of renewable green chemicals from both urban and rural waste materials.

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“…The latest efforts on the characterization of air quality in AFOs were focused on: Spatial and temporal variations in pollutant concentrations and emissions (e.g., Zhu et al, 2000b;Aneja et al, 2008b;Thorne et al, 2009;Chai et al, 2010). Characteristics of odorous VOCs (e.g., Zahn et al, 2001;Schiffman and Williams, 2005) and VFA (e.g., Page et al, 2014). Various factors affecting air quality and the effectiveness of mitigation technologies:…”

Section: Characterizationmentioning

confidence: 99%

Research and demonstration to improve air quality for the U.S. animal feeding operations in the 21st century – A critical review

2015

Environmental Pollution

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Characteristics of volatile fatty acids in stored dairy manure before and after anaerobic digestion

Cited by 56 publications

References 30 publications

Impact of manure storage conditions and time on decomposition and losses from liquid dairy manure stored in a temperate climate

Impact of manure storage conditions and time on decomposition and losses from liquid dairy manure stored in a temperate climate

Volatile fatty acids (VFAs) and methane from food waste and cow slurry: Comparison of biogas and VFA fermentation processes

Research and demonstration to improve air quality for the U.S. animal feeding operations in the 21st century – A critical review

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