Nutrient distribution within and release from the contaminated sediment of
Haihe River |
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Authors: | Min Wu Suiliang Huang Wei Wen Xueming Sun Xianqiang Tang and Miklas Scholz |
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Institution: | 1. Key Laboratory of Pollution Processes and Environmental Criteria of Ministry of Education,Nankai University, Tianjin 300457, China. E-mail: wumin@mail.nankai.edu.cn ;Numerical Simulation Group for Water Environment, 7iunjin Key Laboratory of Environmental Remediation and Pollution Control, College of Environmental Science and Engineering, Nankai University, Tianjin 300071, China 2. Civil Engineering Research Centre, School of Computing, Science and Engineering, The University of Salford, Newton Building,Salford M5 4WT, England, United Kingdom |
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Abstract: | We assessed nutrient characteristics, distributions and fractions within the disturbed and undisturbed sediments at four sampling
sites within the mainstream of Haihe River. The river sediments contained mostly sand (> 60%). The fraction of clay was < 3%. Total
nitrogen (TN) and total phosphorus (TP) concentrations ranged from 729 to 1922 mg/kg and from 692 to 1388 mg/kg, respectively.
Nutrient concentrations within the sediments usually decreased with increasing depth. The TN and TP concentrations within the
fine sand were higher than for that within silt. Sediment phosphorus fractions were between 2.99% and 3.37% Ex-P (exchangeable
phosphorus), 7.89% and 13.71% Fe/Al-P (Fe, Al oxides bound phosphorus), 61.32% and 70.14% Ca-P (calcium-bound phosphorus),
and 17.03% and 22.04% Org-P (organic phosphorus). Nitrogen and phosphorus release from sediment could lead to the presence of
21.02 mg N/L and 3.10 mg P/L within the water column. A river restoration project should address the sediment nutrient stock. |
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Keywords: | total nitrogen and phosphorus calcium-bound phosphorus organic phosphorus undisturbed aquatic sediment disturbed
aquatic sediment river restoration |
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