Journal article
Reduction of volatile fatty acids and odor offensiveness by anaerobic digestion and solid separation of dairy manure during manure storage
Journal of environmental management, Vol.152, pp.91-98
04/01/2015
Handle:
https://hdl.handle.net/2376/107105
PMID: 25617873
Abstract
Volatile fatty acids (VFA) play an important role in the biodegradation of organic wastes and production of bioenergy under anaerobic digestion, and are related to malodors. However, little is known about the dynamics of VFA during dairy manure storage. This study evaluated the characteristics of VFA in dairy manure before and after anaerobic co-digestion in a laboratory experiment using eight lab-scale reactors. The reactors were loaded with four different types of dairy manure: (1) liquid dairy manure from a freestall barn, (2) mixture of dairy manure and co-digestion food processing wastes at the inlet of an anaerobic digester, (3) effluent from the digester outlet, and (4) the liquid fraction of effluent from a solid separator. Four VFA (acetic, propionic, butyric, and 2-methylbutyric acids) were identified and quantified in weekly manure samples from all reactors. Results showed that the dominant VFA was acetic acid in all four manure sources. The off-farm co-digestion wastes significantly increased the total VFA concentrations and the proportions of individual VFA in the influent. The dairy manure under storage demonstrated high temporal and spatial variations in pH and VFA concentrations. Anaerobic digestion reduced the total VFA by 86%-96%; but solid-liquid separation did not demonstrate a significant reduction in total VFA in this study. Using VFA as an indicator, anaerobic digestion exhibited an effective reduction of dairy manure odor offensiveness.
Metrics
11 Record Views
Details
- Title
- Reduction of volatile fatty acids and odor offensiveness by anaerobic digestion and solid separation of dairy manure during manure storage
- Creators
- Laura H Page - Department of Agricultural and Biological Engineering, Purdue University, 225 S. University Street, West Lafayette, IN 47907, USAJi-Qin Ni - Department of Agricultural and Biological Engineering, Purdue University, 225 S. University Street, West Lafayette, IN 47907, USA. Electronic address: jiqin@purdue.eduHao Zhang - Department of Agricultural and Biological Engineering, Purdue University, 225 S. University Street, West Lafayette, IN 47907, USAAlbert J Heber - Department of Agricultural and Biological Engineering, Purdue University, 225 S. University Street, West Lafayette, IN 47907, USANathan S Mosier - Department of Agricultural and Biological Engineering, Purdue University, 225 S. University Street, West Lafayette, IN 47907, USAXingya Liu - Department of Agricultural and Biological Engineering, Purdue University, 225 S. University Street, West Lafayette, IN 47907, USAHung-Soo Joo - Department of Biological Systems Engineering, Washington State University, PO Box 646120, Pullman, WA 98935, USAPius M Ndegwa - Department of Biological Systems Engineering, Washington State University, PO Box 646120, Pullman, WA 98935, USAJoseph H Harrison - Department of Animal Sciences, Washington State University, Research and Extension Center, 2606 West Pioneer, Pulyallup, WA 98371, USA
- Publication Details
- Journal of environmental management, Vol.152, pp.91-98
- Academic Unit
- Animal Sciences, Department of; Biological Systems Engineering, Department of
- Publisher
- England
- Identifiers
- 99900546776001842
- Language
- English
- Resource Type
- Journal article