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Water 2017, 9(1), 6;

Effects of Nonaerated Circulation Water Velocity on Nutrient Release from Aquaculture Pond Sediments

School of Civil Engineering and Transportation, South China University of Technology, Guangzhou 510640, China
Pearl River Fisheries Research Institute, Chinese Academy of Fishery Science, Guangzhou 510380, China
Department of Civil and Environmental Engineering, Old Dominion University, Norfolk, VA 23529, USA
Author to whom correspondence should be addressed.
Academic Editor: Miklas Scholz
Received: 31 October 2016 / Revised: 13 December 2016 / Accepted: 19 December 2016 / Published: 24 December 2016
(This article belongs to the Special Issue Water-Soil-Vegetation Dynamic Interactions in Changing Climate)
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Sustaining good water quality in aquaculture ponds is vital. Without an aerator, the dissolved oxygen in ponds comes primarily from mass transfer at the water-ambient atmosphere interface. As sediment can seriously affect water quality, this study used indoor experiments to examine the nutrient (nitrogen and phosphorus) release mechanisms and fluxes from sediment in aquaculture ponds with moving water but no aeration. The results showed that the ammonia nitrogen (NH3-N) concentration in the overlying water was inversely proportional to flow velocity and that a higher flow velocity tended to result in a lower concentration in the overlying water, a steeper vertical gradient of concentration within the bed sediments, and a faster release rate from the sediments. The sediment disturbed by flowing water released more nitrate nitrogen (NO3-N) and nitrite nitrogen (NO2-N) into the overlying water and NO2-N could become oxidized into NO3-N. In still water, NO3-N was released gradually and some anaerobic NO3-N was nitrified into NO2-N. Phosphorus release from the sediments was controlled by the adsorption–desorption balance, with the phosphorus concentration in the overlying water dropping gradually to a steady value from its initial maximum. The relationship between NH3-N release flux and flow rate is described by a cubic function. View Full-Text
Keywords: nutrient release; sediments; circulation water; aquaculture nutrient release; sediments; circulation water; aquaculture

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Cheng, X.; Zhu, D.; Wang, X.; Yu, D.; Xie, J. Effects of Nonaerated Circulation Water Velocity on Nutrient Release from Aquaculture Pond Sediments. Water 2017, 9, 6.

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