Increased density of livestock farms in some locations has increased manure nutrient density applied to the land base in that area. The increased nutrient density in some cases exceeds crop demands and leads to increased nutrient losses to the environment. In this study, we are using new approaches (including optimization modeling) to better inform stakeholders on locations which have excess manure nutrients produced as compared to crop uptake and pathways to improve distribution of manure nutrients including manure processing and transport options. The output of this work can be used to guide policy and development of methodologies to transport manure nutrients most cost effectively to improve nutrient distribution over a larger land-base area (such as a watershed).
What did we do?
We gathered data for livestock facilities in Wisconsin including location and production of manure to determine nutrient production as well as cropping information to determine nutrient uptake over a given land base. We then gathered information on several manure processing systems and used optimization models to identify the most cost effective methods of processing and transport to improve nutrient distribution.
What have we learned?
We have found that some manure processing technologies are more economically viable than other technologies based on the desired environmental goal. In addition, we have begun to outline specific policy incentives that may be needed to begin to see increased installations of the manure processing systems modeled.
We plan to further investigate additional manure technologies, develop a website so others can integrate data into the models, and run additional scenarios to guide investments on manure processing systems. In addition, out next steps look to integrate life cycle assessment data into the optimization models for refinement of integration of environmental impacts.
Rebecca A. Larson, Associate Professor, Biological Systems Engineering, University of Wisconsin-Madison, email@example.com
Horacio Aguirre-Villegas, Assistant Scientist, Biological Systems Engineering, University of Wisconsin-Madison
Mahmoud Sharara, Assistant Professor, North Carolina State University
Victor Zavala, Associate Professor, Chemical & Biological Engineering, University of Wisconsin-Madison
Apoorva Sampat, Chemical & Biological Engineering, University of Wisconsin-Madison
Yicheng Hu, Chemical & Biological Engineering, University of Wisconsin-Madison
This material is based on work that is supported by the National Institute of Food and Agriculture, U.S. Department of Agriculture, under award number 2017-67003-26055.
The authors are solely responsible for the content of these proceedings. The technical information does not necessarily reflect the official position of the sponsoring agencies or institutions represented by planning committee members, and inclusion and distribution herein does not constitute an endorsement of views expressed by the same. Printed materials included herein are not refereed publications. Citations should appear as follows. EXAMPLE: Authors. 2019. Title of presentation. Waste to Worth. Minneapolis, MN. April 22-26, 2019. URL of this page. Accessed on: today’s date.