کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
6302118 | 1618029 | 2014 | 9 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Batch feed and intermittent recirculation to increase removed loads in a vertical subsurface flow filter
ترجمه فارسی عنوان
تغذیه دسته ای و گردش مجدد متناوب برای افزایش بارهای حذف شده در یک فیلتر جریان عمودی
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کلمات کلیدی
فیلتر جریان جریان زیراب عمودی، فاضلاب، تکرار، حذف نیتروژن، بارهای آلی بالا، نیاز منطقه،
موضوعات مرتبط
علوم زیستی و بیوفناوری
علوم کشاورزی و بیولوژیک
بوم شناسی، تکامل، رفتار و سامانه شناسی
چکیده انگلیسی
An alternative configuration of Vertical Subsurface Flow Constructed Wetland (VSSF CW) is presented in this paper. The proposed FID-VSSF system (batch Feed + Intermittent recirculation + free Drainage) is the combination of the following features: fill-and-drain, treatment phase with recirculation, idle period and free drainage. The aim of this configuration is to increase the removed loads in order to reduce the land area requirements of VSSFs. The FID-VSSF was tested under three ranges of applied loads (medium-load of 108 L mâ2 dâ1, high-load of 168 L mâ2 dâ1 and overload of 224 L mâ2 dâ1) and compared with a conventional down flow VSSF (C-VSSF, 68 L mâ2 dâ1). The average removed organic load in the FID-VSSF was 58.5 gCOD mâ2 dâ1 compared to the 25.9 gCOD mâ2 dâ1 removed in the C-VSSF. The removed TKN load in the FID-VSSF was 6.7 gTKN mâ2 dâ1, significantly higher than 3.6 gTKN mâ2 dâ1 removed in the C-VSSF. Simultaneous nitrification/denitrification and enhanced TN removal was observed in the FID-VSSF as a consequence of saturated and unsaturated conditions due to the intermittent recirculations and saturated water level on the bottom. A limit of the proposed system, which emerged during the overload period, was the decrease of nitrification rate due to the ponding formation. The use of recirculation demonstrates the possibility of reducing the area requirement of VSSF wetlands to 1.4 m2/PE with the FID-VSSF configuration (compared to 3.5 m2/PE of a conventional configuration) or of treating higher loads during seasonal peaks. The FID-VSSF configuration, made up of recirculation pipes, simple automatic valves and a small pumping station, results in low energy consumption yet allows land area reduction and improvements in nitrogen removal within the system.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Ecological Engineering - Volume 70, September 2014, Pages 124-132
Journal: Ecological Engineering - Volume 70, September 2014, Pages 124-132
نویسندگان
P. Foladori, J. Ruaben, A.R.C. Ortigara, G. Andreottola,