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LONG-TERM TREATMENT EFFICIENCY OF A HORIZONTAL SUBSURFACE FLOW CONSTRUCTED WETLAND AT JIMLÍKOV, CZECH REPUBLIC

Data aparitiei: January / 2014
Revista: Environmental Engineering and Management JournalVol. 13Nr. 1
ISSN: 1843 - 3707
Pret: 25.00 RON    
N.A.
Abstract
The present study is aimed at a long-term treatment performance of a constructed wetland with horizontal subsurface flow at
Jimlíkov, Czech Republic. The system was put in operation in 1993 and the treatment performance is evaluated for the period
1998-2009 due to non-existence of results from the beginning of operation. The parameters of concern were BOD5 (biochemical
oxygen demand), COD (chemical oxygen demand), TSS (total suspended solids), NH4-N (ammonia-N) and TP (total
phosphorus). A total of 69 sampling campaigns have been taken into consideration with 35 samples taken during the winter period
(November-April) and 34 samples taken during the summer period (May-October). The average outflow concentrations of BOD5,
COD, TSS, NH4-N and TP were 3.3 mg/L, 27.4 mg/L, 7.1 mg/L, 3.3 mg/L and 1.0 mg/L, respectively and the respective removal
efficiencies amounted to 96%, 87%, 93%, 88% and 75%. The outflow concentrations of parameters which are regulated by
discharge standards were easily met for BOD5, COD and TSS throughout the evaluated period. There was no significant
difference between the outflow concentrations of monitored parameters during summer (May-October) and winter (November-
April) periods. The results revealed that treatment performance of CW Jimlíkov was very high and steady during the 12-year
monitoring period and that all discharge limits set by water authorities were met despite the fact that CW Jimlíkov was built
among the first constructed wetlands in the Czech Republic with limited knowledge on the design.


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