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Treatment of landfill leachate in a constructed free water surface wetland system over a decade – Identification of disturbance in process behaviour and removal of eutrophying substances and organic material
Halmstad University, School of Business, Engineering and Science, The Rydberg Laboratory for Applied Sciences (RLAS).ORCID iD: 0000-0003-0553-7918
Faculty of Civil & Environmental Engineering, Gdansk University of Technology, Gdansk, Poland.ORCID iD: 0000-0002-9164-528X
2019 (English)In: Journal of Environmental Management, ISSN 0301-4797, E-ISSN 1095-8630, Vol. 249, article id 109319Article in journal (Refereed) Published
Abstract [en]

An 8 ha free water surface wetland system in Orebro, Sweden, which has sediment traps followed by 10 ponds for treatment of landfill leachate in the methanogenic stage, was studied from 2003 to 2012. The wetland was irregularly loaded and the leachate characteristics showed high temporal and spatial variability, so Multivariate Statistical Process Control was chosen as the diagnostic tool for detecting anomalies prior to assessing removal efficiency for eutrophying substances and organics. Disturbances in process behaviour included those due to intermittent flow, dilution due to snowmelt, an episode of high pollutant load, and sampling technique. The wetland total nitrogen mass removal was 89%, resulting in a first order rate coefficient of 1.7 m/year. Total phosphorus mass removal was 98%, while mass reduction was lower for TOC (60%), although this was still below discharge limits. The low amount of labile organic material and phosphate are probably the main reasons for the low denitrification rate. © 2019 Elsevier Ltd. All rights reserved.

Place, publisher, year, edition, pages
London, UK: Academic Press, 2019. Vol. 249, article id 109319
Keywords [en]
Landfill leachate treatment, Free surface constructed wetland, Long-term evaluation, Treatment performance, Multivariate analysis
National Category
Water Engineering
Identifiers
URN: urn:nbn:se:hh:diva-41447DOI: 10.1016/j.jenvman.2019.109319ISI: 000492797500014PubMedID: 31404856Scopus ID: 2-s2.0-85070318829OAI: oai:DiVA.org:hh-41447DiVA, id: diva2:1390248
Available from: 2020-01-31 Created: 2020-01-31 Last updated: 2020-02-06Bibliographically approved

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Waara, Sylvia

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