Acidification of raw and co-digested pig slurries with alum before mechanical separation reduces gaseous emission during storage of solid and liquid fractions

Regueiro, Iria; Coutinho, João; Gioelli, F.; Balsari, P.; Dinuccio, Elio; Fangueiro, David

doi:10.1016/j.agee.2016.04.016

Cited by 33 publications

(36 citation statements)

References 33 publications

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“…5), corresponding to a reduction in NH 3 emissions of 62% as a result of acidification. The reduction in NH 3 emissions as a result of acidification of the manure was less than the 80 to 92% reductions reported in earlier studies (Kai et al, 2008; Petersen et al, 2014; Regueiro et al, 2016) and was the result of the pH increasing over time following acidification. Thus the buffering capacity of the manure potentially plays a role in determining not only the amount of acid needed but also the efficacy of the acidifying effect.…”

Section: Resultscontrasting

confidence: 63%

Transformation of Organic Matter and the Emissions of Methane and Ammonia during Storage of Liquid Manure as Affected by Acidification

et al. 2017

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Acidification of livestock manure can reduce emission of the greenhouse gases methane (CH) and nitrous oxide (NO), as well as ammonia (NH). We examined the relation between emission of these gases and transformation of organic matter as affected by acidification. Liquid cattle manure was acidified with sulfuric acid to pH 5.5 at a pilot scale (100 L), and we measured effects on CH, NO, CO and NH emissions and on transformation of pH buffer components and organic matter. Acidification reduced NH emissions by 62% (47 d) and emission of CH by 68% (57 d). Emissions of NO were negligible, probably due to the absence of a surface crust. Reductions in NH and CH emission were highest at the start but declined over time concomitantly with a gradual increase in the stored liquid manure pH. Acidification did not significantly affect CO emissions. Emission of CO was high, five- to ten-fold of CH emissions, until Day 16 of storage, after which the CO emission rate declined to around twice the CH emission rate; consequently, the majority of C loss during the early stages of storage was CO. Cumulative emission of C in CO and CH closely matched depletion of dissolved organic carbon (DOC), suggesting that DOC may be a predictor for CH emission from dilute slurries. volatile fatty acid and total ammoniacal nitrogen concentrations in surface layers were substantially higher than at the center of stored liquid manure, perhaps resulting from microbial activity at the surface. This pattern deserves attention when predicting NH emission from stored slurry.

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Section: Resultscontrasting

confidence: 63%

Transformation of Organic Matter and the Emissions of Methane and Ammonia during Storage of Liquid Manure as Affected by Acidification

et al. 2017

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“…For N 2 O, biological treatment leads to an average increase of 10% (CI −10, 30) (7 studies and 26 observations). The result of the experiment by Regueiro et al [32], showed a significant decrease in NH 3 and N 2 O emissions when the digestate was acidified prior to storage. The activities of microbes are also reduced at low pH-values, and thus acidification may prove to be useful for the hindrance of methanogens (pH-value below 6); moreover, one of the requirements for nitrification is a neutral to slight alkaline condition.…”

Section: Effect Of Separation Of Slurry Into Solid and Liquid Fractionsmentioning

confidence: 96%

“…The acidification of slurry material during storage and soil application has been reported by various authors to decrease NH 3 emissions by shifting equilibrium between NH 3 and NH 4 + , with low pH favoring NH 4 + dominance [16,21,26]. Furthermore, acidification is used to reduce the emissions of CH 4 [16,27,28], N 2 O [29,30], and CO 2 [24,26,31,32].…”

Section: Impact Of Acidification In Reference To Raw Slurrymentioning

confidence: 99%

“…Some studies reported a small to medium (about −10%) reduction of NH 3 emissions due to manure separation during storage [24,37,42]. Regarding manure separation during application, Dinuccio et al [2,46,47] and Regueiro et al [32] highlighted an increased emission. The mean reduction in NH 3 emission for the present meta-analysis was very limited, i.e., −1% (CI −13, +11).…”

Section: Effect Of Separation Of Slurry Into Solid and Liquid Fractionsmentioning

confidence: 99%

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Meta-Analysis of Strategies to Reduce NH3 Emissions from Slurries in European Agriculture and Consequences for Greenhouse Gas Emissions

2020

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The intensification of livestock production, to accommodate rising human population, has led to a higher emission of ammonia into the environment. For the reduction of ammonia emissions, different management steps have been reported in most EU countries. Some authors, however, have criticized such individual measures, because attempts to abate the emission of ammonia may lead to significant increases in either methane, nitrous oxide, or carbon dioxide. In this study, we carried out a meta-analysis of experimental European data published in peer-reviewed journals to evaluate the impact of major agricultural management practices on ammonia emissions, including the pollution swapping effect. The result of our meta-analysis showed that for the treatment, storage, and application stages, only slurry acidification was effective for the reduction of ammonia emissions (−69%), and had no pollution swapping effect with other greenhouse gases, like nitrous oxide (−21%), methane (−86%), and carbon dioxide (−15%). All other management strategies, like biological treatment, separation strategies, different storage types, the concealing of the liquid slurry with different materials, and variable field applications were effective to varying degrees for the abatement of ammonia emission, but also resulted in the increased emission of at least one other greenhouse gas. The strategies focusing on the decrease of ammonia emissions neglected the consequences of the emissions of other greenhouse gases. We recommend a combination of treatment technologies, like acidification and soil incorporation, and/or embracing emerging technologies, such as microbial inhibitors and slow release fertilizers.

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“…of potential environmental impacts such as the emission of GHGs (i.e., CO 2 , CH 4 , and N 2 O) and other atmospheric pollutants (e.g., NH 3 ) during storage and after land spreading of digestate (Amon et al, 2006). Acidification before an eventual solid-liquid separation has been shown as a good emission abatement practice when managing digested livestock slurries (Regueiro et al, 2016). Occurrence and fate of soil pollutants such as pathogens, heavy metals, pesticides, and hormones, which can be harmful if entering in the human food chain, has also been assessed (Govasmark et al, 2011;Rodriguez-Navas et al, 2013;Bonetta et al, 2014).…”

Section: 65mentioning

confidence: 99%

Research Trends on Nutrient Management From Digestates Assessed Using a Bibliometric Approach

Magrí

2018

Front. Sustain. Food Syst.

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Anaerobic digestion is often applied for biological conversion and valorization of organic waste, waste water and other biomass sources as renewable energy and biofuel in the form of biomethane. Composition of the material remaining after digestion, or digestate, is highly dependent on processed feedstocks. This by-product is usually rich in nutrients such as nitrogen and phosphorus, so it is potentially reusable as fertilizer or nutritive broth in agricultural systems. Alternatively, the digestate may need post-treatment based on nutrient removal or recovery strategies. The use of life-cycle assessment tools is becoming popular to analyze nutrient handling scenarios. This study reviews, through a bibliometric-based approach, the research outputs and global trends in the area of knowledge of nutrient management from digestates in the last 30 years, 2017 included. Documentary production followed an upward trend, with a relative productivity in the last 3 years greater than 37% of the total number of appeared publications. China, USA and Spain were the three most prolific countries. The particular interest in nutrient management alternatives and its evolution were identified. Trends for promoting sustainability include low environmental impact, holistic agro-energy solutions, reduced consumption of resources during digestate processing, and circular economy scenarios based on concepts such as (bio)refinery and recovery of valuable and marketable products.

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Acidification of raw and co-digested pig slurries with alum before mechanical separation reduces gaseous emission during storage of solid and liquid fractions

Cited by 33 publications

References 33 publications

Transformation of Organic Matter and the Emissions of Methane and Ammonia during Storage of Liquid Manure as Affected by Acidification

Transformation of Organic Matter and the Emissions of Methane and Ammonia during Storage of Liquid Manure as Affected by Acidification

Meta-Analysis of Strategies to Reduce NH3 Emissions from Slurries in European Agriculture and Consequences for Greenhouse Gas Emissions

Research Trends on Nutrient Management From Digestates Assessed Using a Bibliometric Approach

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