Title of article :
Effect of stone filters in a pond–wetland system treating raw wastewater from a university campus Original Research Article
Author/Authors :
J.A. Herrera-Melian، نويسنده , , J. Arana، نويسنده , , O. Gonz?lez D?az، نويسنده , , M.E. Aguiar Bujalance، نويسنده , , J.M. Do?a Rodr?guez، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 2009
Pages :
8
From page :
277
To page :
284
Abstract :
Dissolved biochemical demand (BOD), total organic carbon (TOC) and NH4-N were analysed in seven sampling points in a pond–wetland system treating raw wastewater from 2001 to 2005 to determine the efficiency of its constructive elements. The wetland consists of horizontal flow stone filters, free water wetlands and a final subsurface flow wetland. Elimination (g d-1) and elimination efficiency (g d-1 m-2) were calculated for each constructive element. The highest BOD elimination was achieved by the pond (1714 g d-1), particularly when the highest BOD loads were applied. However, the highest BOD elimination efficiency was given by the first stone filter (45 g m-2 d-1). Although NH4-N elimination was highest in the pond and the horizontal subsurface flow constructed wetland with 432 and 104 g d-1, respectively, the stone filters achieved much higher elimination efficiencies than the other elements, about 15.8 g m-2 d-1 each. These results can be explained in terms of the combination of high bacterial activity in the stone filters with higher oxygenation in the pond and surface flow wetlands, and suggest that NH4-N elimination can be improved by combining short horizontal surface and subsurface flow wetlands instead of using only a longer subsurface flow constructed wetland.
Keywords :
Facultative pond , Stone filters , Surface and subsurface horizontal flow constructed wetlands
Journal title :
Desalination
Serial Year :
2009
Journal title :
Desalination
Record number :
1112015
Link To Document :
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