Journal of Food, Agriculture and Environment

Effect of water-flow on nutrient mitigation from surface water in drainage ditches

Author(s):

Shuhui Huang ¹, Huanqiang Liu ¹, Zijun Yan ¹, Hailuo Sun¹, Minghua Zhang ^{1, 2}, Randy A. Dahlgren ², Xuedong Wang ^1*

Recieved Date: 2011-01-18, Accepted Date: 2011-03-22

Abstract:

Water quality is easily impacted by agricultural planting and drainage systems flowing into rivers. In this investigation, the effects of agricultural drainage ditches located in Sanyang wetland, Wenzhou, China, were studied for their ability to mitigate soluble inorganic nitrogen and phosphate under different sampling times and water-flow conditions. A significantly decreasing trend of NH₄-N concentration in drainage ditches was observed with increasing distance under three water-flow velocities (0.03, 0.06 and 0.1 m³/h). The concentrations of NH₄-N varied at different times during each day under 0.3 m³/h water-flow, with higher concentrations from 11:00 to 23:00 than at other times. There were significant correlations between on-site NH₄⁺ and filtered NO₂-N (r=0.54236, α<0.001), and between on-site NH₃ and filtered NO₂-N (r=0.52867, α<0.001). The different dynamic trend between filtered NO₂-N and NO₃-N may have involved the conversion of nitrate to ammonium and denitrification. No significant difference of PO₄^3- concentration was observed over distances from 20 to 70 m on the 1^st, 3^rd, 5^th or 7^th day of retention under 0.03 m³/h water-flow conditions. These results can provide a better understanding of nutrient mitigation under different conditions of hydraulic retention time.

Keywords:

Drainage ditches, water-flow, ammonium, nitrate, phosphate

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Journal: Journal of Food, Agriculture and Environment
Year: 2012
Volume: 10
Issue: 1
Category: Environment
Pages: 650-655

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