Abstract
Understanding the effect of manure particle fractionation on transport, retention, and release of bacteria plays a critical role in manure management and environmental policies that address soil and water bacterial pollution. Compared to soil particle size, there is less understanding of the importance of solid manure particle size and fractionation on bacterial fate and transport in soils. Four different cow manure particle sizes (0.25, 0.5, 1, and 2 mm) were used to investigate Escherichia coli fate in a saturated loamy sand soil. Leaching experiments were performed for up to 20 pore volumes. Preferential transport of chloride mitigated as manure particle size increased. The larger manure fractions (1 and 2 mm) showed greater heterogeneity in bacteria transport and release; smaller manure fractions (0.25 and 0.5 mm) had a greater bacteria retention with retarded release. Bacteria release was associated with transport and re-entrainment of manure particles through soil columns. The results highlighted the contribution of fine and transported particles as of primary importance for retention near the surface and transporting bacteria in soil. Similar retention shapes (i.e., exponential) for different fractions illustrated the similarity of manure source, where greater retention was observed at 0−3 cm depth for the smallest (0.25 mm) and largest (2 mm) manure fractions. The findings also highlighted the dependency of bacteria transport, retention, and release on manure physical fractionation, which should be considered in managing soil and manure practices in the field.
| Original language | English |
|---|---|
| Article number | 102086 |
| Number of pages | 9 |
| Journal | Environmental Technology and Innovation |
| Volume | 25 |
| Early online date | 29 Nov 2021 |
| DOIs | |
| Publication status | Published - Feb 2022 |
Bibliographical note
Funding Information:The funding was provided by Shahrekord University, Iran ( 97GRN1M1951 ). N. Sepehrnia would like to thank the Alexander von Humboldt Foundation, Germany for the financial support and Postdoctoral Fellowship at Leibniz University of Hannover, Germany. The authors greatly appreciate the constructive comments and discussion provided by Prof. Mark Coyne, University of Kentucky, USA.
CRediT authorship contribution statement
Sayyed-Hassan Tabatabaei: Conceived and designed the experiments, Reviewing & editing. Nasrollah Sepehrnia: Conceptualization, Methodology, Conceived and designed the experiments, Analyzed and interpreted the data, Contributed reagents, Materials, Analysis tools or data, Wrote the paper. Hamdollah Norouzi: Performed the experiments. Hossein Shirani: Reviewing & editing. Fereidoun Rezanezhad: Reviewing & editing.
Funding
The funding was provided by Shahrekord University, Iran (97GRN1M1951). N. Sepehrnia would like to thank the Alexander von Humboldt Foundation, Germany for the financial support and Postdoctoral Fellowship at Leibniz University of Hannover, Germany. The authors greatly appreciate the constructive comments and discussion provided by Prof. Mark Coyne, University of Kentucky, USA. The funding was provided by Shahrekord University, Iran ( 97GRN1M1951 ). N. Sepehrnia would like to thank the Alexander von Humboldt Foundation, Germany for the financial support and Postdoctoral Fellowship at Leibniz University of Hannover, Germany. The authors greatly appreciate the constructive comments and discussion provided by Prof. Mark Coyne, University of Kentucky, USA.
Keywords
- Bacterial transport and retention
- Escherichia coli
- Manure management
- Particle size
- Soil pollution
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