2024-03-28T13:23:38Zhttp://digital.csic.es/dspace-oai/requestoai:digital.csic.es:10261/172982019-02-27T08:25:32Zcom_10261_5062com_10261_5col_10261_5064
2009-09-30T08:39:44Z
urn:hdl:10261/17298
Initial contaminant removal performance factors in horizontal flow reed beds used for treating urban wastewater
García, Joan
Aguirre, Paula
Mujeriego, Rafael
Huang, Yuming
Ortiz Vera, Laura
Bayona Termens, Josep María
Constructed wetlands
Hydraulic loading rate
Aspect ratio
Water depth
Subsurface flow
10 pages, 4 figures, 5 tables.-- PMID: 15026221 [PubMed].-- Printed version published Apr 2004.
This study evaluates the effect of hydraulic loading rate (HLR), aspect ratio, granular medium size and water depth on the removal of selected contaminants during the start up of horizontal subsurface flow reed beds (HFRBs). Experiments were carried out in a pilot-scale HFRB system comprising four pairs of lined beds of almost equal surface area (54–56 m2 each bed), with the following aspect ratios: 1:1, 1.5:1, 2:1 and 2.5:1. The size of the granular medium of each pair varied from coarse granitic gravel (D60=10 mm, Cu=1.6) to small granitic gravel (D60=3.5 mm, Cu=1.7). The beds of the pair with longest aspect ratio were made shallower (0.27 m) than the rest (0.5 m) The system was sampled weekly from May 2001 to January 2002. The results indicate that HLR and water depth are determining factors in the performance of the HFRBs. Beds with a water depth of 0.27 m removed more COD (70–80%), BOD5 (70–85%), ammonia (40–50%) and dissolved reactive phosphorus (DRP) (10–22%) than beds with a depth of 0.5 m (60–65% for COD, 50–60% for BOD5, 25–30% for ammonia, and 2–10% for DRP). The higher efficiency observed shallower beds was related to their less reducing conditions (average redox potential (E) ranging from −351 to −338 mV) than beds with a depth of 0.5 m (−390 to −358 mV). The difference in E status between two bed types seems to lead to differences in the biochemical processes. In fact, denitrification was estimated to be a significant reaction in shallower beds.
2009-09-30T08:39:44Z
2009-09-30T08:39:44Z
2004-03-05
artículo
Water Research 38(7): 1669-1678 (2004)
0043-1354
http://hdl.handle.net/10261/17298
10.1016/j.watres.2004.01.011
1879-2448
eng
http://dx.doi.org/10.1016/j.watres.2004.01.011
closedAccess
Elsevier