Journal article
Effects of bioreactor temperature and time on odor-related parameters in aerated swine manure slurries
Environmental technology, Vol.24(8), pp.1007-1016
08/01/2003
Handle:
https://hdl.handle.net/2376/112385
PMID: 14509392
Abstract
Previous studies have linked odor generation from swine manure to some characteristics of the liquid manure such oxidation-reduction potential (ORP), five-day biochemical oxygen demand (BOD
5
), volatile fatty acids (VFAs), and predominant microbial population. This study investigated the effect of bioreactor temperature and time on the aforementioned parameters during aeration of swine manure. Five reactors (13 1 capacity) loaded with swine manure and maintained at temperatures of 5, 10, 15, 20, and 25
o
C, were supplied with air for 15 days to maintain aerobic conditions. Large fluctuations in ORP (-120 to 360 mV) were observed in the first seven days of aeration, which stabilized thereafter regardless of the bioreactor temperature. The percentage removal of VFAs and BOD
5
in the manure significantly increased from 0.0% on day one to 87.8% and 65.3%, respectively, on day nine, and remained relatively constant thereafter. The mean percentage of VFAs and BOD
5
removed also increased significantly with an increase in the bioreactor temperature. The VFAs and BOD
5
removal increased by approximately 25% and 35%, respectively, in going from 5 to 25°C, during the 15 days of aeration. Both VFAs and BOD
5
in the manure were significantly correlated with ORP, aerobic bacteria, and anaerobic bacteria. The data suggested that continued aeration for seven days at 20 or 25°C was sufficient for significant reduction of odor precursors (VFAs and BOD
5
) and in stabilization of swine manure. A linear correlation of 0.97 between VFAs and BOD
5
indicated that the two parameters can be used interchangeably as indicators of odor release potential in swine manure.
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Details
- Title
- Effects of bioreactor temperature and time on odor-related parameters in aerated swine manure slurries
- Creators
- P.M Ndegwa - Biosystems & Agricultural Engineering Department , Oklahoma State UniversityJun Zhu - Southern Research & Outreach Center , University of MinnesotaA Luo - Southern Research & Outreach Center , University of Minnesota
- Publication Details
- Environmental technology, Vol.24(8), pp.1007-1016
- Academic Unit
- Biological Systems Engineering, Department of
- Publisher
- Taylor & Francis Group
- Identifiers
- 99900547689301842
- Language
- English
- Resource Type
- Journal article