Nutrient distribution within and release from the contaminated sediment of Haihe River

• Published in: Journal of environmental sciences (China) Vol. 23; no. 7; pp. 1086 - 1094
• Main Authors: Wu, Miny, Huang, Suiliang, Wen, Wei, Sun, Xueming, Tang, Xianqiang, Scholz, Miklas
• Format: Journal Article
• Language: English
• Published: Netherlands Elsevier B.V 01.01.2011; 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%Civil Engineering Research Centre, School of Computing, Science and Engineering, The University of Salford, Newton Building,Salford M5 4WT, England, United Kingdom; Key Laboratory of Pollution Processes and Environmental Criteria of Ministry of Education,Nankai University, Tianjin 300457, China. E-mail: wumin@mail.nankai.edu.cn
• Subjects: aluminum; aluminum oxide; calcium-bound phosphorus; clay fraction; disturbed aquatic sediment; Environmental Monitoring; Freshwater; Geologic Sediments - analysis; iron; nitrogen; Nitrogen - analysis; nitrogen content; organic phosphorus; phosphorus; Phosphorus - analysis; river restoration; rivers; Rivers - chemistry; sand; sediment contamination; silt; total nitrogen and phosphorus; undisturbed aquatic sediment; Water Pollutants, Chemical - analysis; 修复工程; 养分含量; 分布范围; 污染沉积物; 河流沉积物; 海河流域; 营养特点; 铝氧化物; China; calcium-bound phosphorus; river restoration; undisturbed aquatic sediment; disturbed aquatic sediment; total nitrogen and phosphorus; organic phosphorus
• ISSN: 1001-0742; 1878-7320
• DOI: 10.1016/S1001-0742(10)60491-3

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.