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

摘要: Limits on land applications of slurry nitrogen (N) and phosphorus (P) are used to restrict losses nutrients caused by livestock production. Here, we a model assess technologies that enable more even geographic distribution land. Technologies included were screw press separation, with or without solid fraction composting, centrifuge separation liquid ammonia (NH3) stripping, anaerobic digestion. Regulatory constraints placed first the application in N, then P, N P both producing (donor) receiving (recipient) farms. Finally, constraint preventing an increase donor farm NH3 emissions was imposed. Separation had little effect per unit mass slurry, but stripping led reduction. Centrifuge allowed greater pig production than press, especially regulation. only advantageous regulation when combined scrubbing housing ventilation air, constraint. There penalty for using composting The choice appropriate management option therefore depends focus Nuanced complex regulations necessary take advantage synergies avoid cross-policy conflicts incongruencies.