کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
5784559 1639338 2017 26 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Modeling phytoremediation of nitrogen-polluted water using water hyacinth (Eichhornia crassipes)
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات ژئوشیمی و پترولوژی
پیش نمایش صفحه اول مقاله
Modeling phytoremediation of nitrogen-polluted water using water hyacinth (Eichhornia crassipes)
چکیده انگلیسی
Water hyacinth (Eichhornia crassipes) has a great potential for purification of wastewater through physical, chemical and biological mechanisms. In an attempt to improve the quality of effluents discharged from waste stabilization ponds at the University of Dar es Salaam, a pilot plant was constructed to experiment the effectiveness of this plants for transformation and removal of nitrogen. Samples of wastewater were collected and examined for water quality parameters, including pH, temperature, dissolved oxygen, and various forms of nitrogen, which were used as input parameters in a kinetic mathematical model. A conceptual model was then developed to model various processes in the system using STELLA 6.0.1 software. The results show that total nitrogen was removed by 63.9%. Denitrification contributed 73.8% of the removed nitrogen. Other dominant nitrogen removal mechanisms are net sedimentation and uptake by water hyacinth, which contributed 16.7% and 9.5% of the removed nitrogen, respectively. The model indicated that in presence of water hyacinth biofilm about 1.26 g Nm−2day−1 of nitrogen was removed. However, in the absence of biofilm in water hyacinth pond, the permanent nitrogen removal was only 0.89 g Nm−2day−1. This suggests that in absence of water hyacinth, the efficiency of nitrogen removal would decrease by 29.4%.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Physics and Chemistry of the Earth, Parts A/B/C - Volume 100, August 2017, Pages 170-180
نویسندگان
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