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

Book Title: NA
Year Published: 2004
Month Published: NA
Author: Shiratani, E ; Yoshinaga, I ; Feng, Y ; Hasebe, H
Book Group Author: NA
Abstract:

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.

Pages: 55-62
URL: NA
Volume: 49
Number: 3
Journal: WATER SCIENCE AND TECHNOLOGY
Journal ISO: Water Sci. Technol.
Organization: IWA
Publisher: I W A PUBLISHING
ISBN: NA
ISSN: 0273-1223
DOI: NA
Keywords:

clay bottomed canal; denitrification; irrigation system; paddy field; wetland

Source: Web of Science
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