Effects of Acidifying Pig Diets on Emissions of Ammonia, Methane, and Sulfur from Slurry during Storage

Eriksen, Jørgen; Nørgaard, J.V.; Poulsen, Hanne; Poulsen, Henrik Vestergaard; Jensen, Bent Borg; Petersen, Søren O.

doi:10.2134/jeq2014.03.0108

Cited by 11 publications

(6 citation statements)

References 42 publications

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“…The slurry pH of dairy cow [24] and pig slurry [42] was reported to be significantly correlated with VFA/NH 4 + +NH 3 . Eriksen et al [52] demonstrated that an increase in pH value during the first week of storage was caused by the mineralization of organically bounded N [53]. This pH increase could only be observed for the very fresh sow slurry (cold: +0.33 and warm: +0.08 pH units from week 0 to week 1) ( Figure 7, 'sow') because it still contains a high content of urea (see Section 4.3).…”

Section: Initial Ph Valuementioning

confidence: 99%

Dynamics of Different Buffer Systems in Slurries Based on Time and Temperature of Storage and Their Visualization by a New Mathematical Tool

Overmeyer

Holtkamp

Clemens³

et al. 2020

Animals

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Simple Summary: Efficient slurry management is a key strategy to reduce the release of environmentally harmful gases produced by farm animals. Slurry treatments such as acidification and alkalization have proven to be promising solutions to reduce these emissions. In this context, it is crucial to understand how buffer capacities behave and may influence each other during storage under the influence of different temperatures. To realize this, we have developed and successfully verified a new mathematical tool. It allows an exact calculation and detailed visualization of the most important buffer systems found in the analyzed slurries. This knowledge can be used to optimize slurry treatments, as it allows faster, more precise and efficient timing of pH adjustment, thus, reducing the use of resources.Abstract: Slurry treatments such as acidification and alkalization have proven to be promising solutions to reduce gaseous emission produced by farm animals. The optimization of these technologies requires detailed knowledge of how and to what extent the buffer capacities in slurries will change during storage under the influence of different temperatures, as this may save resources needed to adjust a targeted pH value. Fresh slurries from dairy cows, fattening pigs and sows were collected and stored for 12 weeks under either cold (4.7 ± 1.1 • C) or warm (23.6 ± 2.1 • C) conditions to perform titrations in acidic and alkaline milieu at regular intervals. Based on these results, we successfully verified a new mathematical tool that we have developed to be able to calculate and visualize the most important buffer systems found in the analyzed slurries. Our experimental results showed a strong correlation between the degradation of the volatile fatty acid (VFA) buffer and the emergence of the carbonate buffers, i.e., the HCO 3 − and the CO 3 2− buffer. Furthermore, a drop in the pH value caused by enhanced microbial production of VFAs can be mitigated by the presence of the NH 3 buffer. In conclusion, we demonstrated that the buffers cannot be considered individually but must be interpreted as a complex and interacting system.

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Section: Initial Ph Valuementioning

confidence: 99%

Dynamics of Different Buffer Systems in Slurries Based on Time and Temperature of Storage and Their Visualization by a New Mathematical Tool

Overmeyer

Holtkamp

Clemens³

et al. 2020

Animals

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“…To date, there is scarce literature (Petersen et al, 2013;Eriksen et al, 2014) regarding the use of slurries/urines with manipulated hippuric or benzoic acid content, and most of these have been conducted by increasing their concentration through direct T 1 1 1 1 1 1 1-1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1-1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 addition of these compounds into the slurry (Fangueiro et al, 2015). However, this practice could be difficult to achieve due to the low solubility of both compounds (Krol et al, 2015).…”

Section: Diets and N 2 0 Emission In Soilmentioning

confidence: 99%

Diet management to effectively abate N 2 O emissions from surface applied pig slurry

Sánchez-Martı́n

Beccaccia

Blas

et al. 2017

Agriculture, Ecosystems & Environment

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Application of manure (uriñe and/or feces) to agricultural soils enhances emissions of gases such as nitrous oxide (N 2 0) and carbón dioxide (C0 2 ). Some minor N compounds such as hippuric acid and benzoic acid present in uriñe can be controlled through diet manipulation to mitígate these emissions. The aim of this study was to evalúate how the inclusión of fibrous by-products in the diet of pigs affects hippuric and benzoic acid concentrations in the excreted urine/slurry, and their possible effect on N 2 0 emissions following application of these manures to soil. Slurries were obtained from growing-finishing pigs fed five contrasting diets: a conventional diet (pig slurry control, PSC); and orange pulp and carob meal at a dietary fiber level of 75 or 150 g kg J (OP-75; OP-150; CM-75; CM-150) and were then applied to mesocosms containing young ryegrass plants. A control treatment without slurry was also included. The N 2 0 and C0 2 emissions were measured using static chambers following slurry application, alongside measurements of soil ammonium (NH 4 + ), nitrate (N0 3 ), and dissolved organic carbón. Soils amended with slurries obtained from fibre by-products, OP and CM, decreased N 2 0 emissions by 65 and 47%, respectively, compared with slurries obtained through a conventional pig diet. Benzoic acid was negatively correlated with N 2 0 emission for slurries from OP diets, which had over double the hippuric acid content, and more than 1.8 times the benzoic acid content than the CM. However, this effect only occurred during the first week due to rapid degradation of this compound within soil. The possible toxic effect of benzoic acid did not appear to affect soil respiration, since a positive correlation was found. Results of a benzoic acid balance (considering both intake through feed and reléase through uriñe) indicated that the source of both acids were phenolic compounds (polyphenolic or lignin) present in the fibrous fraction. These results show that N 2 0 emissions are more affected than C0 2 by to compounds within urine/faeces that can be manipulated indirectly through the diet.

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“…The use of sulphuric acid for acidification increases the concentration of inorganic sulphur in slurry, which may increase hydrogen sulphide emissions. Eriksen et al (2014), however, emphasize that low pH inhibits the growth and activity of microorganisms colonizing faeces, and thus reduces the amount of pollutants released.…”

Section: Methods For Reducing Emissions Of Gaseous Pollutantsmentioning

confidence: 99%

Emissions of Gaseous Pollutants from Pig Farms and Methods for their Reduction – A Review

Chmielowiec-Korzeniowska

Tymczyna

Wlazło

et al. 2022

Annals of Animal Science

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Agriculture contributes significantly to anthropogenic emissions of greenhouse gases (GHG). Livestock production, including pig production, is associated with several gaseous pollutants released into the atmosphere, including carbon dioxide (CO2), methane (CH4), ammonia (NH3) and nitrous oxide (N2O). Emissions of volatile organic compounds (VOCs), including alcohols, aldehydes, and aromatic and aliphatic hydrocarbons, as well as typically odorous pollutants, are an inseparable element of raising and breeding farm animals. These emissions can degrade local and regional air quality, contribute to surface water eutrophication and acid rain, and increase the greenhouse gas footprint of the production sector. The paper is organized as follows. First, the sources and factors influencing the level of emissions from pig houses are described. Next, the effects of dietary methods (optimization of animal diets), hygienic methods (including microclimate optimization) and technological methods (application of technological solutions) for mitigating emissions from pigs are discussed.

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Effects of Acidifying Pig Diets on Emissions of Ammonia, Methane, and Sulfur from Slurry during Storage

Cited by 11 publications

References 42 publications

Dynamics of Different Buffer Systems in Slurries Based on Time and Temperature of Storage and Their Visualization by a New Mathematical Tool

Dynamics of Different Buffer Systems in Slurries Based on Time and Temperature of Storage and Their Visualization by a New Mathematical Tool

Diet management to effectively abate N 2 O emissions from surface applied pig slurry

Emissions of Gaseous Pollutants from Pig Farms and Methods for their Reduction – A Review

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