Phosphorus removal in a pilot scale free water surface constructed wetland: hydraulic retention time, seasonality and standing stock evaluation
Autor: | Jan Vymazal, Aldrew Alencar Baldovi, Tatiane Araujo de Jesus, André Ribeiro de Barros Aguiar, Roseli Frederigi Benassi |
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Rok vydání: | 2020 |
Předmět: |
Eichhornia crassipes
Environmental Engineering Hydraulic retention time Nitrogen Health Toxicology and Mutagenesis 0208 environmental biotechnology Ecotechnology 02 engineering and technology 010501 environmental sciences Wastewater 01 natural sciences Waste Disposal Fluid Animal science Nutrient medicine Environmental Chemistry 0105 earth and related environmental sciences biology Public Health Environmental and Occupational Health Water Phosphorus General Medicine General Chemistry Seasonality medicine.disease biology.organism_classification Pollution 020801 environmental engineering Eichhornia Wetlands Constructed wetland Environmental science Sewage treatment Water Pollutants Chemical |
Zdroj: | Chemosphere. 266 |
ISSN: | 1879-1298 |
Popis: | Constructed wetlands (CWs) are decentralized wastewater treatment systems considered to be green and low cost. They have the potential to effectively remove pollutants and recycle nutrients with plant composting. However, they need large areas to implement them due to the usual high Hydraulic Retention Times (HRT), reaching up to 50 days. The main objective of the present study was to evaluate the influence of HRT (HRT = 3, 7, and 10 days), and seasonality on Total Phosphorus (TP) removal, and standing stock in a pilot scale free water surface CW (FWS CW). Unplanted and planted (Eichhornia crassipes) tanks were evaluated in wet and dry seasons. The FWS CW was set up as a complementary treatment to a secondary level wastewater treatment plant. The system was monitored weekly for ten months, totalizing 29 replicate samplings (n = 58). Planted tanks were harvested every week to keep free space for plant reproduction (∼40%). The mean removal efficiency of TP ranged between 82% and 95% without a significant difference between HRT (pvalue > 0.05). However, when the effects of the sedimentation of the unplanted tanks were disregarded, the lowest HRT (3 days) tank presented the highest standing stock of TP. The wet season presented a significant difference in TP removal results (pvalue |
Databáze: | OpenAIRE |
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