Journal
JOURNAL OF ENVIRONMENTAL MANAGEMENT
Volume 199, Issue -, Pages 83-90Publisher
ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jenvman.2017.05.018
Keywords
LCA; Cow manure; Superheated steam drying; Global warming potential; Eutrophication potential; Acidification potential
Categories
Funding
- USEPA P3 Grant [SU836037]
- Petroleum and Petrochemical College of Chulalongkorn University, Bangkok, Thailand
- Department of Chemical Engineering at The University of Toledo, Ohio, USA
- EPA [150463, SU836037] Funding Source: Federal RePORTER
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Common methods of managing dairy manure are directly applying it to the farm field as a fertilizer. For direct application without any type of treatment, the majority of nutrients in the manure run off to the local river and lake during precipitation periods. The algae bloom is one of the environmental outcomes due to eutrophication of the lakes, which may jeopardize the quality of drinking water. In this study, superheated steam drying (SSD) technology is investigated as an alternative manure management method. Rapidly dried cow manure can be used. as alternative fuel. Evaluations of energy payback time (EPBT) and life cycle assessment (LCA) of the SSD technology are presented in the SSD scenario and the results are compared with those of the direct field application (FA) of fresh manure and anaerobic digestion (AD). The heat required for the generation of superheated steam in the SSD scenario is provided from combustion of the dry manure to reduce energy costs. The results for the SSD process show 95% and 70% lower eutrophication and global warming potential in comparison to the FA scenario. Acidification potential for SSD turned out to be 35% higher than FA. The comparison of SSD with AD for their EPBT and normalized impacts indicated that the proposed SSD scenario has higher environmental sustainability than AD (70% lower impact), and is likely an economically better choice compared to conventional AD method (87% lower EPBT) for the future investment. (C) 2017 Elsevier Ltd. All rights reserved.
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