The Extent of Manure Removal from Storages and Its Impact on Gaseous Emissions

Ngwabie, Ngwa Martin; VanderZaag, Andrew; Dunfield, Kari E.; Sissoko, Alassane; Wagner-Riddle, Claudia

doi:10.2134/jeq2016.01.0004

Cited by 14 publications

(25 citation statements)

References 14 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The cumulative NH 3 emissions for the 160 d of monitoring were 641, 376, and 304 g m −2 for the control, medium pH, and low pH tanks, respectively (Table 2). Our results are similar to Ngwabie et al (2016), who reported on average NH 3 emissions of 450 g m −2 from stored liquid dairy manure (182 d) with 0 to 25% inoculum.…”

Section: Resultssupporting

confidence: 92%

Greenhouse Gas Mitigation through Dairy Manure Acidification

et al. 2019

View full text Add to dashboard Cite

Liquid dairy manure storages are sources of methane (CH4), nitrous oxide (N2O), and ammonia (NH3) emissions. Both CH4 and N2O are greenhouse gases (GHGs), whereas NH3 is an indirect source of N2O emissions. Manure acidification is a strategy used to reduce NH3 emissions from swine manure; however, limited research has expanded this strategy to reducing CH4 and N2O emissions by acidifying dairy manure. This study compared control dairy manure (pH 7.4) with two treatments of acidified manure using 70% sulfuric acid (H2SO4). These included a medium pH treatment (pH 6.5, 1.4 mL acid L−1 manure) and a low pH treatment (pH 6, 2.4 mL acid L−1 manure). Emissions were measured using replicated mesoscale manure tanks (6.6 m2) enclosed by large steady state chambers. Both CH4 and N2O were continuously measured (June–December 2017) using tunable diode laser trace gas analyzers. Ammonia emissions were measured three times weekly for 24 h using acid traps. On a CO2 equivalent basis, the medium pH treatment reduced total GHG emissions by 85%, whereas the low pH treatment reduced emissions by 88%, relative to untreated (control) manure. Total CH4 emissions were reduced by 87 and 89% from medium and low pH tanks, respectively. Ammonia emissions were reduced by 41 and 53% from medium and low pH tanks, respectively. Additional research is necessary to make acidification an accessible option for farmers by optimizing acid dosage. More research is need to describe the manure buffering capacity and emission reductions and ultimately find the best approaches for treating farm‐scale liquid dairy manure tanks. Core Ideas Acidification reduced total CO2–eq GHGs from liquid dairy manure by 85 to 88%. Total CH4 emissions were reduced by 87 to 89% from acidified manure. NH3 emissions were reduced by 41 to 53% from acidified manure. A range of yearly H2SO4 cost was estimated to be Can$6.55 to $19.6 cow−1.

show abstract

Section: Resultssupporting

confidence: 92%

Greenhouse Gas Mitigation through Dairy Manure Acidification

et al. 2019

View full text Add to dashboard Cite

show abstract

“…() and Ngwabie et al. () found cumulative N 2 O emissions typically exceeding 20 g m −2 . The observed NH 3 emission pattern and low N 2 O emissions are consistent with the lack of crust formation on the tank surface, which favors NH 3 emission over N 2 O emission (Aguerre, Wattiaux, & Powell, ; Hansen et al., ; Wood, Gordon, Wagner‐Riddle, Dunfield, & Madani, ).…”

Section: Resultsmentioning

confidence: 93%

“…Ngwabie et al. () conducted a spring‐removal inoculum study using the same experimental site and setup as the current study. Although the source of the manure was different, this prior trial provided a useful means of comparison for seasonal inoculum removal.…”

Section: Resultsmentioning

confidence: 99%

“…The CH 4 and N 2 O flux densities were calculated as described in Ngwabie et al. ():

F_{normalc} = \frac{C_{normalout} - C_{normalin}}{A} Q

where F c is the flux (mg m −2 s −1 ); C out and C in are the outlet and inlet gas concentrations (mg m −3 ), respectively; Q is the air flow rate through the chamber (m 3 s −1 ); and A is the surface area of each tank (6.6 m 2 ). C out was sampled at the outlet of each chamber, and C in was calculated from the mean of two inlet (ambient) readings (Supplemental Figure ).…”

Section: Methodsmentioning

confidence: 99%

“…Emission of CH 4 from stored manure, such as liquid dairy manure, is the result of complex microbial processes; the factors that control the magnitude of these emissions are not fully understood. Length of storage (Zeeman, ), crust characteristics (Hansen, Nielsen, Schramm, Nielsen, & Revsbech, ; Sommer, Petersen, & Søgaard, ), temperature (Arikan, Mulbry, & Lansing, ), substrate availability (Sommer, Petersen, & Moller, ), and the level of inoculum (Ngwabie et al., ; Wood et al., ) have been identified as factors that affect CH 4 emissions.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Does overwintering change the inoculum effect on methane emissions from stored liquid manure?

et al. 2020

View full text Add to dashboard Cite

Greenhouse gas (GHG) emissions, especially methane (CH4), from manure storage facilities can be substantial. Methane production requires adapted microbial communities (“inoculum”) to be present in the manure. Complete removal of liquid dairy manure (thus removing all inoculum) from storage tanks in the spring has been shown to significantly reduce CH4 emissions over the following warm season. This study examined whether the same mitigation effect would occur after fall removal of liquid dairy manure. Emissions of CH4, nitrous oxide (N2O), ammonia (NH3), and CO2 were measured from six 11.88‐m3 tanks equipped with flow‐through chambers. There were three inoculated controls (20% inoculum) and three uninoculated treatments, where inoculum was completely removed in the fall/winter (0% inoculum). Direct N2O and NH3 (indirect N2O) were minor contributors to the total GHG budget, contributing <2% on a CO2 equivalent (CO2e) basis. Removal of inoculum led to a 34% decrease in total emissions on a CO2e basis and to a 29% decrease in the CH4 conversion factor compared with the inoculated control (0.37 vs. 0.52; p = .01). Overall, removing inoculum in the fall reduced CH4 emissions from manure storage tanks; however, fall inoculum removal was less effective than in a previous study where inoculum was removed in the spring. The timing of inoculum removal may affect the efficiency of this CH4 mitigation strategy. However, this method may be impractical for larger manure storage tanks. Further study is required to overcome challenges of time‐sensitive, complete inoculum removal from farm‐scale storage tanks.

show abstract

Understanding methane emission from stored animal manure: A review to guide model development

et al. 2021

View full text Add to dashboard Cite

National inventories of methane (CH 4 ) emission from manure management are based on guidelines from the Intergovernmental Panel on Climate Change using countryspecific emission factors. These calculations must be simple and, consequently, the effects of management practices and environmental conditions are only crudely represented in the calculations. The intention of this review is to develop a detailed understanding necessary for developing accurate models for calculating CH 4 emission from liquid manure, with particular focus on the microbiological conversion of organic matter to CH 4 . Themes discussed are (a) the liquid manure environment; (b) methane production processes from a modeling perspective; (c) development and adaptation of methanogenic communities; (d) mass and electron conservation; (e) steps limiting CH 4 production; (f) inhibition of methanogens; (g) temperature effects on CH 4 production; and (h) limits of existing estimation approaches. We conclude that a model must include calculation of microbial response to variations in manure temperature, substrate availability and age, and management system, because these variables substantially affect CH 4 production. Methane production can be reduced by manipulating key variables through management procedures, and the effects may be taken into account by including a microbial component in the model. When developing new calculation procedures, it is important to include reasonably accurate algorithms of microbial adaptation. This review presents concepts for these calculations and ideas for how these may be carried out. A need for better quantification of hydrolysis kinetics is identified, and the importance of short-and long-term microbial adaptation is highlighted.

show abstract

The Extent of Manure Removal from Storages and Its Impact on Gaseous Emissions

Cited by 14 publications

References 14 publications

Greenhouse Gas Mitigation through Dairy Manure Acidification

Greenhouse Gas Mitigation through Dairy Manure Acidification

Does overwintering change the inoculum effect on methane emissions from stored liquid manure?

Understanding methane emission from stored animal manure: A review to guide model development

Contact Info

Product

Resources

About