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Nitrogen removal from wastewater in vertical flow constructed wetlands containing LWA/gravel layers and reed vegetation |
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| Authors: | Andrzej Bia?owiec Wojciech Janczukowicz |
| Institution: | a University of Warmia and Mazury in Olsztyn, Department of Environmental Biotechnology, ul. Sloneczna 45 G, 10-900 Olsztyn, Poland b University of Warmia and Mazury in Olsztyn, Department of Environment Protection Engineering, ul. Prawocheńskiego 1, 10-900 Olsztyn, Poland c Cardiff University, School of Biosciences, Cardiff CF10 3AX, UK |
| Abstract: | The influence of light weight aggregates made of fly ash from sewage sludge thermal treatment (FASSTT LWA) on the nitrogen removal efficiency from artificial wastewater in constructed wetlands (CW) with vertical flow reed bed was investigated. Thirty lysimeters with six different double-layer bed constructions (upper layer of FASSTT LWA with thicknesses of: 0 cm, 12 cm, 25 cm, 50 cm, and 100 cm of the total depth of the lysimeter, above a lower gravel layer), either with or without reed plants were operated with wastewater hydraulic loading rate of 4.67 mm/d. During a six-month experiment, high efficiency of ammonia removal was observed. The influence of FASSTT LWA as a bed material and the presence of reed on CW treatment efficiency was determined. The highest total nitrogen removal efficiency, 59.5%, was obtained in the CW with double-layer lysimeters consisting of 25% FASSTT LWA (upper layer), and 75% gravel (lower layer), and planted with reed. |
| Keywords: | Sewage sludge thermal treatment Fly ash Light weight aggregates Constructed wetlands Reed Nitrogen removal |
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