[Removal nitrogen in wavy subsurface-flow constructed wetland utilizing aeration and recirculation].
Huan Jing Ke Xue
; 28(12): 2700-4, 2007 Dec.
Article
en Zh
| MEDLINE
| ID: mdl-18290423
ABSTRACT
To improve the removal rates of ammonium nitrogen in the constructed wetlands, the traditional wavy subsurface-flow constructed wetland (W-SFCW) was modified to install the aeration tube in the second wave interval to improve the DO and the nitrification rates within the constructed wetlands. It was found that as most of COD had been removed in the second wave interval, nitrifying bacteria become dominant in the third wave interval, which led to the nitrification extent reaching more than 90%, and the ability to endure the impact of hydraulic loading was enhanced. Recirculation rates of 50% were adopted to evaluate the effect on TN removal. It showed that with effluent recirculation the average removal efficiencies of TN obviously increased to 50% when the wastewater entered 1/3 of the wetland not infall. The hydraulic loading of wetland reached 0.8 m3/(m2 x d), and COD organic loading was 56-112 g/(m2 x d), and the ammonium loading rate was 20-28 g/(m2 x d).
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Colección:
01-internacional
Base de datos:
MEDLINE
Asunto principal:
Oxígeno
/
Eliminación de Residuos Líquidos
/
Humedales
/
Nitrógeno
Idioma:
Zh
Revista:
Huan Jing Ke Xue
Año:
2007
Tipo del documento:
Article
País de afiliación:
China