Methane emissions from storage of digestate at a dairy manure biogas facility

Maldaner, Lia; Wagner-Riddle, Claudia; VanderZaag, Andrew; Gordon, Robert J.; Duke, C.

doi:10.1016/j.agrformet.2017.12.184

Cited by 52 publications

(26 citation statements)

References 21 publications

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“…(2018) and Maldaner et al. (2018). Briefly, air samples from all intakes were drawn to an automated manifold that switched between each intake at regular intervals (each intake was sampled for 15 s per cycle; there were 10 cycles per half‐hour period).…”

Section: Methodsmentioning

confidence: 96%

“…Concentrations of CH 4 at the study site were measured in vertical profiles on three micrometeorological towers positioned around the concrete storage tank at 210, 81, and 27° from north (for Towers 1–3, respectively) as part of separate studies to determine CH 4 flux from the storage tank filled with manure or digestate (Figure 1; Kariyapperuma et al., 2018; Maldaner et al., 2018). The distance of the storage tank from the nearest point to the main barn was 66 m, and ∼8 m at their nearest and ∼45 m at their farthest point from the AD.…”

Section: Methodsmentioning

confidence: 99%

“…Such studies used inverse dispersion methods and open‐path spectroscopy to quantify emissions but were conducted over relatively short periods of time, without comparative observations made before and after AD installation. Emissions from manure and digestate storage tanks have been measured (Baldé et al., 2016; Maldaner, Wagner‐Riddle, VanderZaag, Gordon, & Duke, 2018; Wagner‐Riddle, Park, & Thurtell, 2006) but have not provided temporal trends of potential emissions from other fugitive on‐farm sources, such as an AD reactor. Elsewhere, studies have measured emissions from individual sources using chamber methods and pressure‐relief valve monitoring (Liebetrau et al., 2010; Reinelt, Liebetrau, & Nelles, 2016).…”

Section: Introductionmentioning

confidence: 99%

“…(2018). After the AD installation in 2012, emissions from stored digestate were compared with stored untreated manure (Maldaner, 2017; Maldaner et al., 2018). For the manure–digestate studies, vertical concentration profiles were measured around the storage tank to determine CH 4 flux from the stored manure–digestate.…”

Section: Introductionmentioning

confidence: 99%

“…Greenhouse gas emissions from the main dairy barn were reported in Ngwabie, Vanderzaag, Jayasundara, and Wagner-Riddle (2014), and those associated with dairy manure-digestate applications to soils are described in and to November 2011 were reported in Kariyapperuma et al (2018). After the AD installation in 2012, emissions from stored digestate were compared with stored untreated manure (Maldaner, 2017;Maldaner et al, 2018). For the manuredigestate studies, vertical concentration profiles were measured around the storage tank to determine CH 4 flux from the stored manure-digestate.…”

Section: Introductionmentioning

confidence: 99%

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Increased dairy farm methane concentrations linked to anaerobic digester in a five‐year study

2020

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Organic waste materials are sources of anthropogenic methane (CH4) emissions. Anaerobic digestion (AD) is a technology that produces biogas from organic waste materials, and CH4 is the primary component of biogas. Unintended emission of CH4 from biogas facilities could undercut the environmental benefits of this technology. The objective of this study was to determine if the implementation of an AD system affected ambient CH4 concentrations ([CH4]) on a commercial dairy farm over 5 yr, from before installation into full operation. Concentrations at 4.5‐m height on a tower receiving wind that originated from various directions, comprising components of the dairy farm such as the AD facility, crop fields, or main barn, were measured using a closed‐path tunable diode laser trace‐gas analyzer. In 2012 and 2013, the first 2 yr of AD operation, [CH4] was not significantly different than pre‐AD levels in 2011 (2.04 ± 0.01 μl L−1). However, mean [CH4] increased to 2.47 ± 0.03 and 2.48 ± 0.04 μl L−1 in 2014 and 2015, respectively, and the occurrence of high [CH4] (>10 μl L−1) increased from <0.05% in Year 1 (pre‐AD) to 12% in Years 4 and 5. These elevated concentrations were related to an increased use of food waste feedstocks over time and suggest that the biogas system was a source of fugitive CH4 emissions. Food waste materials have a high biogas potential and are a valuable resource that require appropriate facility design and management to fully harness their benefits.

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Section: Methodsmentioning

confidence: 96%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Increased dairy farm methane concentrations linked to anaerobic digester in a five‐year study

2020

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Perspectives on peak liquid manure temperature with implications for methane emissions

et al. 2023

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Methane emissions from liquid manure storage are currently estimated with a methane conversion factor (MCF) based on manure temperature inputs or air temperatures as a substitute in the 2019 IPCC Tier 2 method. However, differences between peak manure temperature and peak air temperature (T diff ) in warm seasons are likely to occur and result in poor estimates of MCF and methane emissions. To address this concern, this study aims to investigate the relationship between the T diff and ratio of manure surface area to manure volume (R s:v ) using a mechanistic model and by analyzing farm-scale measurement studies across Canada. Positive correlations between T diff and R s:v were found using a modeling approach and from farm-scale results (r = 0.55, p = 0.06). T diff ranged from -2.2 to 2.6˚C in farm-scale results mainly collected from eastern Canada. We suggest that manure volume and surface area, in addition to removal frequency, could be used to estimate T diff and be part of the criteria for improving manure temperature estimates, which could lead to improved estimates of MCF.

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