کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4388784 1618015 2015 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Multistage hybrid constructed wetland for enhanced removal of nitrogen
ترجمه فارسی عنوان
هیبرید چند مرحله ای تالاب برای افزایش نیتروژن ساخته شده است
کلمات کلیدی
موضوعات مرتبط
علوم زیستی و بیوفناوری علوم کشاورزی و بیولوژیک بوم شناسی، تکامل، رفتار و سامانه شناسی
چکیده انگلیسی


• Three-stage hybrid constructed wetland removed efficiently organics, TSS and nitrogen.
• Outflow NH4-N concentrations were below 5 mg l−1 also during winter.
• Saturated VF CWs as a first stage exhibited a positive role in total nitrogen removal.
• Substantial amounts of both nitrogen and phosphorus were sequestered in plant biomass.

Hybrid constructed wetlands (HCWs) are very efficient in removal of total nitrogen. So far hybrid-constructed wetlands have been composed of various combinations of wetland units but most common combination is vertical flow–horizontal flow system. Also, multistage HCWs have recently been used. The present study describes the use of three-stage HCWs for treatment of municipal sewage. The system consists of saturated vertical flow, free-drain vertical and horizontal flow units in series. The experimental system with a total surface area of 10.1 m2 has been operated for 19 months between March 2009 and October 2010. The results proved that multistage hybrid constructed wetland was able to remove efficiently organics, suspended solids and nitrogen. The overall removal efficiency amounted to 92.5%, 83.8%, 96.0%, 88.8% and 79.9% for BOD5, COD, TSS, NH4-N and TN, respectively. The aerobic vertical flow stage provided high degree of nitrification (removal rate of 4.17 g NH4-N m−2 d−1) while remaining anaerobic stages (first and third) provided suitable conditions for denitrification (removal rates of 0.83 g N-NO3 m−2 d−1 and 0.47 g N-NO3 m−2 d−1, respectively). The outflow NH4-N concentrations were below 5 mg l−1 throughout the monitored period including winter period when the air temperature dropped below −20 °C. Plant biomass sequestered 28% and 26% of phosphorus and nitrogen inflow load, respectively.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Ecological Engineering - Volume 84, November 2015, Pages 202–208
نویسندگان
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