کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9447515 | 1305242 | 2005 | 16 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Treatment at different depths and vertical mixing within a 1-m deep horizontal subsurface-flow wetland
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کلمات کلیدی
موضوعات مرتبط
علوم زیستی و بیوفناوری
علوم کشاورزی و بیولوژیک
بوم شناسی، تکامل، رفتار و سامانه شناسی
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چکیده انگلیسی
The majority of BOD5 removal occurred within the first-third of the bed where vegetation cover was poor. Performance of the bed declined over time from Trial 1 to Trial 2, possibly due to a cumulative build-up of organic matter within the substrate as a result of limited oxygen transfer throughout the 1.0Â m depth of substrate via root leakage or diffusion across the air-water interface. Root penetration was limited to the upper 0.4Â m of the substrate, with the majority of below-ground biomass forming a dense mat in the upper 0.2Â m. A comparison of two-parameter (K-C*) first-order volumetric rate constant (Kv20) with those obtained from 0.4 to 0.6Â m deep HSSF-CW in the same region indicate that a doubling of the wetted depth resulted in no improvement in BOD5 removal and a decline in TN removal on an areal basis. Further investigations are warranted, comparing the performance of replicated beds spanning a range of depths (e.g. 0.25, 0.5 and 1.0Â m) in order to quantitatively determine the optimal depth of HSSF-CWs treating domestic wastewater.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Ecological Engineering - Volume 25, Issue 5, 1 December 2005, Pages 567-582
Journal: Ecological Engineering - Volume 25, Issue 5, 1 December 2005, Pages 567-582
نویسندگان
Thomas R. Headley, Eamon Herity, Leigh Davison,