title: Acidification of animal slurry--a review.
abstract: Ammonia emissions are a major problem associated with animal slurry management, and solutions to overcome this problem are required worldwide by farmers and stakeholders. An obvious way to minimize ammonia emissions from slurry is to decrease slurry pH by addition of acids or other substances. This solution has been used commonly since 2010 in countries such as Denmark, and its efficiency with regard to the minimization of NH3 emissions has been documented in many studies. Nevertheless, the impact of such treatment on other gaseous emissions during storage is not clear, since the studies performed so far have provided different scenarios. Similarly, the impact of the soil application of acidified slurry on plant production and diffuse pollution has been considered in several studies. Also, the impact of acidification upon combination with other slurry treatment technologies (e.g. mechanical separation, anaerobic digestion …) is important to consider. Here, a compilation and critical review of all these studies has been performed in order to fully understand the global impact of slurry acidification and assess the applicability of this treatment for slurry management.
authors.affiliation: UIQA/LEAF-Instituto Superior de Agronomia, Ulisboa, Tapada da Ajuda, 1349-017 Lisboa, Portugal. Electronic address: dfangueiro@isa.utl.pt.
authors.forename: David
authors.initials: D
authors.lastname: Fangueiro
authors.affiliation: Department of Engineering, Aarhus University, Hangøvej 2, 8200 Århus N, Denmark.
authors.forename: Maibritt
authors.initials: M
authors.lastname: Hjorth
authors.affiliation: Dipartimento di Scienze Agrarie Forestali e Alimentari, Università degli Studi di Torino, Largo Paolo Braccini, 2, 10095 Grugliasco (To), Italy.
authors.forename: Fabrizio
authors.initials: F
authors.lastname: Gioelli
mesh_terms: D000143:Acids / Q000737:chemistry*; D000383:Agriculture / Q000379:methods*; D000641:Ammonia / Q000032:analysis / Q000737:chemistry*; D000818:Animals; D003718:Denmark; D004787:Environmental Pollution / Q000517:prevention & control*; D006863:Hydrogen-Ion Concentration; D008372:Manure / Q000032:analysis*; D012987:Soil / Q000737:chemistry*
chemical_list: D000143:Acids; D008372:Manure; D012987:Soil; D000641:Ammonia
keywords: Gaseous emissions; Manure management; Nutrient leaching; Organic fertilizer; Slurry composition; Slurry treatment