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Nitrogen removal fr...
Nitrogen removal from landfill leachate using a compact constructed wetland and the effect of chemical pretreatment
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- Kietlinska, Agnieszka (author)
- KTH,Mark- och vattenteknik
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- Renman, Gunno (author)
- KTH,Mark- och vattenteknik
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Jannes, S. (author)
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Tham, G. (author)
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(creator_code:org_t)
- 2005
- 2005
- English.
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In: Journal of Environmental Science and Health. Part A. - 1093-4529 .- 1532-4117. ; 40:07-jun, s. 1493-1506
- Related links:
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Subject headings
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- Onsite treatment of leachate was implemented at the Tveta Landfill, adjacent to the city of Sodertalje, Sweden. The system consists of leachate collection in a pond, precipitation of metals with chemicals, a constructed wetland, and forest irrigation. This article describes the constructed wetland and its effectiveness at removing ammonia in the system. Pulsed-discharge hydrology and wetland ecology formed the basis for the development of a compact constructed wetland (CCW). The system presented here has most design similarities with vertical sub-surface flow wetlands, though this system is run in batch mode. Chemically purified leachate and untreated leachate were applied to separate sections of the CCW using a filling and emptying schedule. A leachate treatment cycle of about 14 days duration was used, involving a 7 day submerged phase followed by a 7 day drained period. The removal efficiency varied between 40 and 75% on a mass basis. A maximum mass removal rate of up to 5.1 g m(-1) d(-1) was achieved in wetlands receiving leachate after chemical pretreatment. In wetlands receiving non-treated leachate a net release of up to 18 g m(-2) N occurred in the form of nitrate. This indicated a considerable nitrification but limited denitrification in those systems. It was unclear whether the chemical treatment enhanced the nitrogen removal efficiency because of lower toxicity and/or content of fewer competing cations, or other mechanisms. Mechanisms responsible for the NH4-N removal in the CCW system have to be further investigated.
Keyword
- chemically treated leachate
- constructed wetlands
- hydroperiod
- inorganic nitrogen
- onsite treatment
- removal rates
- waste-water
- soil
Publication and Content Type
- ref (subject category)
- art (subject category)
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