کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9447512 | 1305242 | 2005 | 14 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Emission of N2O, N2, CH4, and CO2 from constructed wetlands for wastewater treatment and from riparian buffer zones
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کلمات کلیدی
موضوعات مرتبط
علوم زیستی و بیوفناوری
علوم کشاورزی و بیولوژیک
بوم شناسی، تکامل، رفتار و سامانه شناسی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
We measured nitrous oxide (N2O), dinitrogen (N2), methane (CH4), and carbon dioxide (CO2) fluxes in horizontal and vertical flow constructed wetlands (CW) and in a riparian alder stand in southern Estonia using the closed chamber method in the period from October 2001 to November 2003. The replicates' average values of N2O, N2, CH4 and CO2 fluxes from the riparian gray alder stand varied from â0.4 to 58 μg N2O-N mâ2 hâ1, 0.02-17.4 mg N2-N mâ2 hâ1, 0.1-265 μg CH4-C mâ2 hâ1 and 55-61 mg CO2-C mâ2 hâ1, respectively. In horizontal subsurface flow (HSSF) beds of CWs, the average N2 emission varied from 0.17 to 130 and from 0.33 to 119 mg N2-N mâ2 hâ1 in the vertical subsurface flow (VSSF) beds. The average N2O-N emission from the microsites above the inflow pipes of the HSSF CWs was 6.4-31 μg N2O-N mâ2 hâ1, whereas the outflow microsites emitted 2.4-8 μg N2O-N mâ2 hâ1. In VSSF beds, the same value was 35.6-44.7 μg N2O-N mâ2 hâ1. The average CH4 emission from the inflow and outflow microsites in the HSSF CWs differed significantly, ranging from 640 to 9715 and from 30 to 770 μg CH4-C mâ2 hâ1, respectively. The average CO2 emission was somewhat higher in VSSF beds (140-291 mg CO2-C mâ2 hâ1) and at the inflow microsites of HSSF beds (61-140 mg CO2-C mâ2 hâ1). The global warming potential (GWP) from N2O and CH4 was comparatively high in both types of CWs (4.8 ± 9.8 and 6.8 ± 16.2 t CO2 eq haâ1 aâ1 in the HSSF CW 6.5 ± 13.0 and 5.3 ± 24.7 t CO2 eq haâ1 aâ1 in the hybrid CW, respectively). The GWP of the riparian alder forest from both N2O and CH4 was relatively low (0.4 ± 1.0 and 0.1 ± 0.30 t CO2 eq haâ1 aâ1, respectively), whereas the CO2-C flux was remarkable (3.5 ± 3.7 t haâ1 aâ1). The global influence of CWs is not significant. Even if all global domestic wastewater were treated by wetlands, their share of the trace gas emission budget would be less than 1%.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Ecological Engineering - Volume 25, Issue 5, 1 December 2005, Pages 528-541
Journal: Ecological Engineering - Volume 25, Issue 5, 1 December 2005, Pages 528-541
نویسندگان
Sille Teiter, Ãlo Mander,