Details
| Original language | English |
|---|---|
| Pages (from-to) | 209-215 |
| Number of pages | 7 |
| Journal | Journal of Environmental Management |
| Volume | 227 |
| Early online date | 4 Sept 2018 |
| Publication status | Published - 1 Dec 2018 |
Abstract
Manures are important soil nutrient conditioners and source of several pathogenic bacteria that potentially contribute to groundwater and surface water pollution. The best management practices need a solid understanding of manure sources, concentrations, and strategies to limit the number of bacteria in natural soil environment. In this study, a series of soil column experiments were conducted to investigate how bacteria mobility can potentially be influenced by retention mechanisms while moving through undisturbed saturated soil. This was assessed by bacteria retention profiles and mobility indices including the maximum transported (Cmax-T) and retained (Cmax-R) concentrations, filtration coefficient (λf) and the maximum depth of bacteria transport (Zmax). Three different soil samples (sandy, loamy and silty clay loam) were enriched with three types of manures (cow, sheep, and poultry), placed on top of three soil columns (16 cm diameter, 30 cm height) with an equivalent of 10 Mg ha−1 (dry basis) summing up to a total of 36 columns. Leaching was performed under saturated steady-state conditions (i.e., 1.62 cm min−1) for a duration of 4 pore volumes. After percolation, soil columns were sliced into six 5-cm interval layers and slices were characterized for retained bacteria. Results showed irregular exponential or quasi-exponential bacteria retention profiles for cow and sheep manures, whereas uniform-shaped profiles occurred for poultry manure. The latter variant also switched to exponential shape for the sandy soil at the highest and lowest Cmax-T and Cmax-R values due to higher pore water velocity. The λf and the Zmax values were also found to be affected by soil texture and manure origin. The λf was higher for poultry manure due to higher free-cell transport of bacteria most probably induced by higher amount of soluble mobile components. However, the greater amounts of transported wooden materials released from cow and sheep manures acted as harbors for bacteria. Accordingly, the filtration rate decreased and tailing effects for bacteria transport increased. The results also suggest that the practices and strategies for using manures could be optimized according to the respective transport behavior to manage the bacteria retention with respect to soil and manure types to reduce soil and water pollution.
Keywords
- Bacteria pollution, Deposition, Fecal coliform, Manure, Transport and retain
ASJC Scopus subject areas
- Environmental Science(all)
- Environmental Engineering
- Environmental Science(all)
- Waste Management and Disposal
- Environmental Science(all)
- Management, Monitoring, Policy and Law
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In: Journal of Environmental Management, Vol. 227, 01.12.2018, p. 209-215.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Retention modes of manure-fecal coliforms in soil under saturated hydraulic condition
AU - Sepehrnia, N.
AU - Memarianfard, L.
AU - Moosavi, A. A.
AU - Bachmann, J.
AU - Rezanezhad, F.
AU - Sepehri, M.
N1 - Funding Information: Funding for this project was provided by the German Academic Exchange Service (DAAD), ID: 57210260 . We thank Mr. Mojtaba Jafari-haghighi from Department of Soil Science, Shiraz University , Iran for his assistance with laboratory analysis of particle size distributions.
PY - 2018/12/1
Y1 - 2018/12/1
N2 - Manures are important soil nutrient conditioners and source of several pathogenic bacteria that potentially contribute to groundwater and surface water pollution. The best management practices need a solid understanding of manure sources, concentrations, and strategies to limit the number of bacteria in natural soil environment. In this study, a series of soil column experiments were conducted to investigate how bacteria mobility can potentially be influenced by retention mechanisms while moving through undisturbed saturated soil. This was assessed by bacteria retention profiles and mobility indices including the maximum transported (Cmax-T) and retained (Cmax-R) concentrations, filtration coefficient (λf) and the maximum depth of bacteria transport (Zmax). Three different soil samples (sandy, loamy and silty clay loam) were enriched with three types of manures (cow, sheep, and poultry), placed on top of three soil columns (16 cm diameter, 30 cm height) with an equivalent of 10 Mg ha−1 (dry basis) summing up to a total of 36 columns. Leaching was performed under saturated steady-state conditions (i.e., 1.62 cm min−1) for a duration of 4 pore volumes. After percolation, soil columns were sliced into six 5-cm interval layers and slices were characterized for retained bacteria. Results showed irregular exponential or quasi-exponential bacteria retention profiles for cow and sheep manures, whereas uniform-shaped profiles occurred for poultry manure. The latter variant also switched to exponential shape for the sandy soil at the highest and lowest Cmax-T and Cmax-R values due to higher pore water velocity. The λf and the Zmax values were also found to be affected by soil texture and manure origin. The λf was higher for poultry manure due to higher free-cell transport of bacteria most probably induced by higher amount of soluble mobile components. However, the greater amounts of transported wooden materials released from cow and sheep manures acted as harbors for bacteria. Accordingly, the filtration rate decreased and tailing effects for bacteria transport increased. The results also suggest that the practices and strategies for using manures could be optimized according to the respective transport behavior to manage the bacteria retention with respect to soil and manure types to reduce soil and water pollution.
AB - Manures are important soil nutrient conditioners and source of several pathogenic bacteria that potentially contribute to groundwater and surface water pollution. The best management practices need a solid understanding of manure sources, concentrations, and strategies to limit the number of bacteria in natural soil environment. In this study, a series of soil column experiments were conducted to investigate how bacteria mobility can potentially be influenced by retention mechanisms while moving through undisturbed saturated soil. This was assessed by bacteria retention profiles and mobility indices including the maximum transported (Cmax-T) and retained (Cmax-R) concentrations, filtration coefficient (λf) and the maximum depth of bacteria transport (Zmax). Three different soil samples (sandy, loamy and silty clay loam) were enriched with three types of manures (cow, sheep, and poultry), placed on top of three soil columns (16 cm diameter, 30 cm height) with an equivalent of 10 Mg ha−1 (dry basis) summing up to a total of 36 columns. Leaching was performed under saturated steady-state conditions (i.e., 1.62 cm min−1) for a duration of 4 pore volumes. After percolation, soil columns were sliced into six 5-cm interval layers and slices were characterized for retained bacteria. Results showed irregular exponential or quasi-exponential bacteria retention profiles for cow and sheep manures, whereas uniform-shaped profiles occurred for poultry manure. The latter variant also switched to exponential shape for the sandy soil at the highest and lowest Cmax-T and Cmax-R values due to higher pore water velocity. The λf and the Zmax values were also found to be affected by soil texture and manure origin. The λf was higher for poultry manure due to higher free-cell transport of bacteria most probably induced by higher amount of soluble mobile components. However, the greater amounts of transported wooden materials released from cow and sheep manures acted as harbors for bacteria. Accordingly, the filtration rate decreased and tailing effects for bacteria transport increased. The results also suggest that the practices and strategies for using manures could be optimized according to the respective transport behavior to manage the bacteria retention with respect to soil and manure types to reduce soil and water pollution.
KW - Bacteria pollution
KW - Deposition
KW - Fecal coliform
KW - Manure
KW - Transport and retain
UR - http://www.scopus.com/inward/record.url?scp=85053075119&partnerID=8YFLogxK
U2 - 10.1016/j.jenvman.2018.08.086
DO - 10.1016/j.jenvman.2018.08.086
M3 - Article
C2 - 30193210
AN - SCOPUS:85053075119
VL - 227
SP - 209
EP - 215
JO - Journal of Environmental Management
JF - Journal of Environmental Management
SN - 0301-4797
ER -