دانلود رایگان مقاله بررسی تخصیص مجدد فضای احشام بر کاهش تاثیر گازهای گلخانه ای

ABSTRACT

Historically, concentrated livestock production and, consequently, manure production and management have resulted in considerable environmental impacts in many parts of Europe. The region selected for the current case study was Belgium which is characterized by input-intensive animal production within a geographically concentrated land area. In this study, the effect of a reduction in manure pressure through spatial distribution of CO2 equivalent emissions was investigated and the impact on the carbon footprint verified through a consequential life cycle approach. This was accomplished by investigating the marginal spatial impact on CO2 emissions of a decrease in manure pressure. An economic and environmental optimization was conducted using mathematical linear programming and the main differences between both approaches determined. The results of the model simulations show that, while the economic optimum is achieved by maximizing the transport of raw manure until fertilization standards are fulfilled and subsequently processing the excess manure, the environmental optimum, from a carbon footprint point of view, is achieved by separating all manure, as this strategy causes the least CO2 emissions, mainly due to the limited manure storage time. Moreover, the analyses indicate that rearrangement of the spatial distribution of livestock production in Belgium will not substantially decrease CO2 emissions. As the study demonstrated that manure storage is the main contributor to the carbon footprint, solutions should instead be sought by changing these storage systems. This article contributes to the methodology of the consequential life cycle approach by linking carbon footprint analysis with an economic model that simulates manure disposal decisions driven by legal constraints and market forces.

5. Conclusion

In European regions with concentrated livestock production, manure management creates major environmental problems. As the existing literature reports conflicting results for optimal solutions for pig waste management, this paper investigates the effect of reduced manure pressure through spatial distribution of CO2 eq. emissions and the impact on the CF, verified through a consequential LCA. While, in the past, transport distance was assumed to be an important parameter in the determination of the total CF, our study shows that rearrangement of the spatial distribution of livestock production in Belgium will not substantially decrease CO2 emissions. This article contributes to the methodology of consequential LCA by linking the CF analysis with an economic model that simulates manure disposal decisions driven by legal constraints and market forces. This approach makes possible both an economic and environmental optimization through mathematical linear programming. The main differences between the environmental and economic optima were also determined. The results of the model simulations show that, while the economic optimum is achieved by maximizing the transport of raw manure until fertilization standards are fulfilled and subsequently processing the excess manure, the environmental optimum, from a CF viewpoint, is achieved by separating all manure, as this strategy creates the lowest CO2 emissions, mainly due to the limited manure storage time. As manure storage is the main contributor to the CF, solutions for GHG reduction from manure management should lie in changing these storage systems, rather than in a spatial reallocation of intensive livestock production.