Title of article :
Evaluation of nitrogen reduction in water hyacinth ponds integrated with waste stabilization ponds Original Research Article
Author/Authors :
Qitao Yi، نويسنده , , Youngchul Kim، نويسنده , , Masafumi Tateda، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 2009
Pages :
7
From page :
528
To page :
534
Abstract :
In this paper, a combined aquatic treatment process coupling waste stabilization ponds (WSPs) with water hyacinth ponds (WHPs) was investigated as means to upgrade secondary effluent from a waste water treatment plant (WWTP). Naturally-occurring nitrification and denitrification phenomena were monitored and evaluated on a quantitative basis. The WSP supplied oxygen to the post process WHP, while the inside of the WHP provided a unique denitrification environment caused by respiration and biodegradation of the algae separated by hyacinth plant roots. The nitrification and denitrification rates were 0.04 and 0.02 g/kg day at 20 °C (wet weight basis), respectively, and were strongly affected by seasonal change. The temperature-dependent coefficients Θ were 1.06, which were approximately similar to frequently reported values from other biological nitrogen removal studies. Nitrification and denitrification were expected to occur as the water temperature was maintained between 20° to 30 °C. As plant density increased, their rates were also enhanced. Alkalinity balance corresponded fairly well with nitrogen behaviour during most of the operational period. Oxygen balance test results validated that the water hyacinth was crucial not only for separating algal particles from the WSP, but also for biological nitrogen reduction.
Keywords :
Denitrification , Nitrification , Waste stabilization ponds , Water hyacinth ponds
Journal title :
Desalination
Serial Year :
2009
Journal title :
Desalination
Record number :
1112701
Link To Document :
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