One-Time Acidification of Slurry: What Is the Most Effective Acid and Treatment Strategy?

Overmeyer, Veronika; Kube, Anita; Clemens, Joachim; Büscher, Wolfgang; Trimborn, Manfred

doi:10.3390/agronomy11071319

Cited by 23 publications

(8 citation statements)

References 45 publications

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“…The results indicated that changing the acidity of pig slurry can result in biochemical changes that reduce the formation of certain gases. In other words, acidity is used to create less favorable conditions for the bacteria and enzymes that contribute to NH 3 and H 2 S formation during storage (Overmeyer et al, 2021).…”

Section: Resultsmentioning

confidence: 99%

Efficacy of Aluminum Chloride in Pig Slurry Odor Control During Storage

Kim¹,

Kim²,

Joo³

et al. 2023

AAVS

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Odor emission from animal wastes such as manure and slurry seriously affects animal health, and their environment. The control technology for odor emissions is still needed. Thus, the objective of the current study was to evaluate aluminum chloride (AlCl 3 ) as an acidifier to reduce odorous compounds from pig slurry, as well as microclimatic temperature variations and pig eye conditions in pig indoor facilities during storage. A total of 360 crossbred fattening pigs ([Landrace × Yorkshire] × Duroc]) with an average body weight of 60.5 ± 1.21 kg, were randomly divided into nine-floor pens (40 pigs/pen) in a single facility for a month. Aluminum chloride was added weekly to pig slurry pits (3.5×9.0×1.5 m) at 0, 0.05, and 0.1% AlCl 3 on a volumetric basis determined by the estimated final manure volume for each flush cycle. Ammonia levels were measured twice a week at 90 cm height and ammonia, hydrogen sulfide, methyl mercaptan, and dimethyl sulfide levels were measured twice a week at 10 cm height from the pig slurry pits. Over time, the addition of 0.05% and 0.1% AlCl 3 decreased overall ammonia and hydrogen sulfide losses and average ammonia and hydrogen sulfide levels at 10 cm height and overall ammonia losses at 90 cm height from the pig slurry pits. Methyl mercaptan and dimethyl sulfite gases were not detected at 10 cm height from the pig slurry pits. In addition, the microclimatic temperature and eye inflammation were reduced by the 0.05% and 0.1% AlCl 3 treatments because of the acidifying properties of AlCl 3 . AlCl 3 treatment is the best management practice that improves a pig-rearing environment.

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Section: Resultsmentioning

confidence: 99%

Efficacy of Aluminum Chloride in Pig Slurry Odor Control During Storage

Kim¹,

Kim²,

Joo³

et al. 2023

AAVS

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“…The process of manure acidification, where sulfuric or other similar acids are introduced into manure, effectively reduces ammonia emissions, a significant environmental concern in dairy farming. By lowering the pH, this technique inhibits the volatilization process of ammonia, thereby curtailing its release into the atmosphere [78][79][80][81][82]. Moreover, acidified manure presents added benefits for soil health, particularly in enhancing nutrient retention and availability.…”

Section: Acidification Of Manure For Ammonia Emission Reductionmentioning

confidence: 99%

Innovative Strategies for Sustainable Dairy Farming in Canada amidst Climate Change

Neethirajan

2023

Sustainability

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In recent years, the Canadian dairy sector has faced escalating challenges due to its significant contribution to greenhouse gas emissions, particularly methane. This paper critically examines a spectrum of innovative techniques aimed at mitigating methane emissions within this sector, scrutinizing their cost-effectiveness, efficiency, compatibility with animal welfare standards, and adherence to both existing and prospective Canadian environmental legislations. The discourse begins with an exhaustive overview of contemporary methane reduction methodologies relevant to dairy farming, followed by a rigorous analysis of their economic feasibility. This includes a detailed cost-benefit analysis, juxtaposed with the efficiency and technological advancements these techniques embody. A pivotal aspect of this examination is the alignment of animal welfare with emission reduction objectives, ensuring that the strategies employed do not compromise the health and well-being of dairy cattle. Furthermore, the paper delves into the legislative landscape of Canada, evaluating the congruence of these techniques with current environmental laws and anticipating future regulatory shifts. Performance indicators for emission reduction are critically assessed, establishing benchmarks tailored to the Canadian context. This is complemented by an exploration of the market potential of these innovations, including factors influencing their adoption and scalability in the market. The analysis culminates with a synthesis of case studies and best practices within Canada, offering insights into successful implementations and drawing lessons for future endeavors. This comprehensive approach not only addresses the immediate environmental and health impacts associated with dairy farming emissions but also significantly contributes to the overarching goal of sustainable development in the agricultural sector. The research presented in this paper holds significant implications for the future of sustainable dairy farming, offering a model for addressing environmental challenges while maintaining economic viability and animal welfare.

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“…Petersen et al 12 observed a gradual increase of pH from acidified cattle from 4.5 to 6 in a 3-month study. Overmeyer et al 48 investigated the stability of pH in acidified slurry and reported that only acidification to pH 3.0 allows a long-term reduction due to the reduction of degradation of VFA and mineralization of organic nitrogen. However, Fangueiro et al 49 observed a stable pH during the storage period after acidification of cattle slurry to pH 5.5 with no further addition of fresh slurry.…”

Section: Full-scale Slurry Storagementioning

confidence: 99%

Full-Scale Investigation of Methane and Ammonia Mitigation by Early Single-Dose Slurry Storage Acidification

Lemes

Garcı́a

Nyord

et al. 2022

ACS Agric. Sci. Technol.

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The effects of early acidification with sulfuric acid of animal slurry in concrete storage tanks to pH 5 on methane and ammonia emissions have been investigated on two cattle and two pig slurry storage tanks in full scale. The tanks’ up- and down-wind concentrations were measured online by cavity ring-down spectroscopy (CRDS). The inverse-dispersion method (IDM), using a backward Lagrangian stochastic (bLS) model, was used to determine the emission rates. The results show that CH4 emissions after single-dose acidification of slurry tanks in the early summer were reduced by 95 ± 14% and 95% ± 6% for cattle and pig manure, respectively, compared to the emissions measured before acidification. The reductions occurred even though pH increased during the storage with and without addition of fresh slurry. After acidification, NH3 emissions were comparable to or lower than when a natural crust was present. A supplementary experiment on small-scale slurry containers was conducted to investigate the pH development when fresh slurry was added to the acidified slurry. The influence of pH development on the long-term emission dynamics of methane is discussed by comparing the large-scale and small-scale studies. The study presents the first full-scale documentation that slurry acidification is a promising technology for mitigation of methane from slurry storage.

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One-Time Acidification of Slurry: What Is the Most Effective Acid and Treatment Strategy?

Cited by 23 publications

References 45 publications

Efficacy of Aluminum Chloride in Pig Slurry Odor Control During Storage

Efficacy of Aluminum Chloride in Pig Slurry Odor Control During Storage

Innovative Strategies for Sustainable Dairy Farming in Canada amidst Climate Change

Full-Scale Investigation of Methane and Ammonia Mitigation by Early Single-Dose Slurry Storage Acidification

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