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J Environ Manage

Title:		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
Author(s):		Waara S; Wojciechowska E;
Address:		"Wetland Research Centre, Department of Environmental- and Biosciences, School of Business, Engineering and Science, Halmstad University, Box 823, 301 18, Halmstad, Sweden. Electronic address: sylvia.waara@hh.se. Gdansk University of Technology, Faculty of Civil and Environmental Engineering, ul. Narutowicza 11/12, 80-233, Gdansk, Poland. Electronic address: esien@pg.edu.pl"
Journal Title:		J Environ Manage
Year:		2019
Volume:		20190809
Issue:
Page Number:		109319 -
DOI:		10.1016/j.jenvman.2019.109319
ISSN/ISBN:		1095-8630 (Electronic) 0301-4797 (Linking)
Abstract:		"An 8?ª+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?ª+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"
Keywords:		"Denitrification Nitrogen Sweden Water *Water Pollutants, Chemical *Wetlands Free surface constructed wetland Landfill leachate treatment Long-term evaluation Multivariate analysis Treatment performance;"
Notes:		"MedlineWaara, Sylvia Wojciechowska, Ewa eng England 2019/08/14 J Environ Manage. 2019 Nov 1; 249:109319. doi: 10.1016/j.jenvman.2019.109319. Epub 2019 Aug 9"