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Centrifuge separation effect on bacterial indicator reduction in dairy manure
Zong Liu1, Zachary S Carroll2, Sharon C Long3
1Dep. of Biological Systems Engineering, Univ. of Wisconsin-Madison, 460 Henry Mall, Madison, WI 53706, United States.
Journal of Environmental Management
|January 28, 2017
Summary
Higher g-force centrifugation effectively reduced bacterial indicators in manure liquid, but current farm systems need redesign for optimal pathogen removal. This research explores enhancing manure treatment for safety.
Area of Science:
- Environmental Science
- Agricultural Engineering
- Microbiology
Background:
- Manure processing commonly uses centrifugation to separate solids and nutrients on large farms.
- Pathogen reduction in manure is crucial for safe use as soil amendments and recycled water.
- Current manure centrifugation systems show negligible pathogen indicator removal in the liquid fraction.
Purpose of the Study:
- To investigate the impact of centrifugation and polymer addition on bacterial indicator removal from liquid manure.
- To evaluate the potential for improving pathogen reduction in manure processing systems.
Main Methods:
- Analysis of farm-scale manure centrifuge processing systems.
- Laboratory experiments involving a range of centrifugal forces (g-forces).
- Assessment of flocculating polymer addition effects on bacterial indicator removal.
Main Results:
- Centrifugation at typical farm operational speeds showed negligible reduction in pathogen indicator concentrations.
- Polymer addition had minimal impact on bacterial indicator levels, even at high g-forces.
- High g-force centrifugation (exceeding typical operational speeds) achieved up to two-log10 reduction in bacterial indicators.
Conclusions:
- Standard manure centrifugation is insufficient for significant pathogen reduction in the liquid phase.
- Higher g-force centrifugation demonstrates potential for substantial bacterial indicator removal.
- Redesigning manure centrifuge equipment could enhance zoonotic pathogen control and improve manure management safety.
