TY - JOUR

T1 - Modelling the potential of slurry management technologies to reduce the constraints of environmental legislation on pig production

AU - Hutchings, Nicholas John

AU - ten Hoeve, Marieke

AU - Jensen, Rikke

AU - Bruun, Sander

AU - Fjerbæk Søtoft, Lene

PY - 2013

Y1 - 2013

N2 - Limits on land applications of slurry nitrogen (N) and phosphorus (P) are used to restrict losses of nutrients caused by livestock production. Here, we used a model to assess technologies that enable a more even geographic distribution of slurry nutrients to land. Technologies included were screw press slurry separation, with or without solid fraction composting, centrifuge separation with or without liquid fraction ammonia (NH) stripping, and anaerobic digestion. Regulatory constraints were placed first on the application in slurry of N, then P, then N and P both on the producing (donor) and receiving (recipient) farms. Finally, a constraint preventing an increase in donor farm NH emissions was imposed. Separation had little effect on N losses per unit mass of slurry, but NH stripping led to a reduction. Centrifuge separation allowed a greater increase in pig production than a screw press, especially with P regulation. NH stripping was only advantageous with N regulation or when combined with NH scrubbing of pig housing ventilation air, when donor farm NH emissions were a constraint. There was a production penalty for using composting or anaerobic digestion. The choice of appropriate slurry management option therefore depends on the focus of the regulation. Nuanced and therefore complex regulations are necessary to take advantage of synergies and avoid cross-policy conflicts and incongruencies.

AB - Limits on land applications of slurry nitrogen (N) and phosphorus (P) are used to restrict losses of nutrients caused by livestock production. Here, we used a model to assess technologies that enable a more even geographic distribution of slurry nutrients to land. Technologies included were screw press slurry separation, with or without solid fraction composting, centrifuge separation with or without liquid fraction ammonia (NH) stripping, and anaerobic digestion. Regulatory constraints were placed first on the application in slurry of N, then P, then N and P both on the producing (donor) and receiving (recipient) farms. Finally, a constraint preventing an increase in donor farm NH emissions was imposed. Separation had little effect on N losses per unit mass of slurry, but NH stripping led to a reduction. Centrifuge separation allowed a greater increase in pig production than a screw press, especially with P regulation. NH stripping was only advantageous with N regulation or when combined with NH scrubbing of pig housing ventilation air, when donor farm NH emissions were a constraint. There was a production penalty for using composting or anaerobic digestion. The choice of appropriate slurry management option therefore depends on the focus of the regulation. Nuanced and therefore complex regulations are necessary to take advantage of synergies and avoid cross-policy conflicts and incongruencies.

UR - http://www.scopus.com/inward/record.url?scp=84886849624&partnerID=8YFLogxK

U2 - 10.1016/j.jenvman.2013.08.063

DO - 10.1016/j.jenvman.2013.08.063

M3 - Journal article

C2 - 24184986

AN - SCOPUS:84886849624

VL - 130

SP - 447

EP - 456

JO - Journal of Environmental Management

JF - Journal of Environmental Management

SN - 0301-4797

ER -