Reduced Ammonia Emissions from Slurry after Self-Acidification with Organic Supplements

Clemens, Joachim; Bergmann, Sabine; Vandré, Robert

doi:10.1080/09593332508618400

Cited by 31 publications

(20 citation statements)

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“…Although a number of mitigation strategies presently exist, many require significant infrastructure (e.g., anaerobic digesters) or create possible tradeoffs through increasing one GHG in lieu of another (e.g., solid–liquid separation reduces CH 4 while increasing N 2 O emissions) (Alexander, 1977; Janzen, 2008; Fillingham et al, 2017; Guest et al, 2017). Acidification is a possible treatment option, because it can inhibit methanogenesis and also limit NH 3 volatilization (Clemens et al, 2002). …”

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confidence: 99%

Greenhouse Gas Mitigation through Dairy Manure Acidification

et al. 2019

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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.

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confidence: 99%

Greenhouse Gas Mitigation through Dairy Manure Acidification

et al. 2019

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“…The persistence of the EM community within the slurry, however, remains unknown, and further research should focus on which organisms are most important and whether further inoculum is required as slurry is progressively added to the store. Addition of a readily fermentable C source to slurry (e.g., through a biological waste product) may also provide an opportunity to promote self-acidification (Clemens et al, 2002). Acidification represents one of the most promising methods to reduce NH 3 losses from slurry stores (Fangueiro et al, 2015).…”

Section: Resultsmentioning

confidence: 99%

Reduction of Methane Emission during Slurry Storage by the Addition of Effective Microorganisms and Excessive Carbon Source from Brewing Sugar

2016

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Storing livestock manure is the primary stage of manure management where microbial processes and chemical reactions result in the release of methane (CH), nitrous oxide (NO), ammonia (NH), and carbon dioxide (CO). This study examined the reduction of CH emissions from slurry storage under two temperatures (cool [10°C] and warm [30°C]) when a glucose-rich substrate (brewing sugar) and activated effective microorganisms were applied at 10% (w/w) and 5% (v/w), respectively. Brewing sugar addition influenced microbial anaerobic respiration, resulting in a reduction of slurry pH to <5.0, through "self-acidification" caused by lactic acid production. Subsequently, CH emissions were significantly reduced by 87 and 99% in the cool and warm environments, respectively. The effective microorganism treatment did not change the chemical characteristics of the slurry but reduced CH emissions by 17 and 27% ( < 0.05) in the cool and warm environments, respectively. These results suggest that self-acidification after addition of a carbon source may be a promising alternative to slurry acidification using concentrated acids.

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“…Additional acidification techniques include self-acidification (Clemens et al, 2002) and the use of animal fodder additives (Li et al, 2006;Eriksen et al, 2010;Nørgaard et al, 2010) but, in the present paper, only the three previously mentioned technologies involving acid addition will be covered since they are the most widely used and studied.…”

Section: Acidification Methodologiesmentioning

confidence: 99%