Scenario analysis for reduction of effluent load from an agricultural area by recycling the run-off water

We reviewed rates of nitrogen (N) removal in paddy fields and wetlands. Then we developed a numerical model to simulate N flow in an agricultural paddy field area and analyzed scenarios for recycling the agricultural run-off, including field drainage, from an agricultural area with an irrigation/dra...

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Bibliographic Details
Published in:Water science and technology 2004-01, Vol.49 (3), p.55-62
Main Authors: Shiratani, E, Yoshinaga, I, Feng, Y, Hasebe, H
Format: Article
Language:English
Subjects:
Agricultural management
Agricultural runoff
Agriculture
Canals
Computer simulation
Conservation of Natural Resources
Drainage systems
Ecosystem
Effluents
Irrigation systems
Load distribution
Mathematical models
Nitrogen
Nitrogen - isolation & purification
Oryza
Recycling
Reduction
Reservoirs
Runoff
Water Movements
Water Pollution - prevention & control
Water Purification - methods
Wetlands
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Summary:We reviewed rates of nitrogen (N) removal in paddy fields and wetlands. Then we developed a numerical model to simulate N flow in an agricultural paddy field area and analyzed scenarios for recycling the agricultural run-off, including field drainage, from an agricultural area with an irrigation/drainage system. In it, we considered N removal in paddy fields, a regulating reservoir, and canals. The review showed that the rate constant for N removal in paddy fields and wetlands was 0.025 m/d under natural conditions and 0.01 m/d under dark conditions. The scenario analysis of recycling paddy field run-off within the model area indicated that a large amount of the effluent load occurred during the transplanting period and that recycling could reduce the effluent N load. The effluent N load would be equal to the inflowing N load at a 48% recycling rate. In this scenario, paddy fields accounted for most of the reduction in the effluent N load, and the mean removal rates per unit area of paddy field and regulating reservoir were 53.6 g ha(-1)d(-1) and 222.6 g ha(-1)d(-1) , respectively.
ISSN:0273-1223
1996-9732
DOI:10.2166/wst.2004.0162