University of Oulu

Postila, H., Karjalainen, S., Kløve, B. (2017) Can limestone, steel slag or man-made sorption materials be used to enhance phosphate-phosphorus retention in treatment wetland for peat extraction runoff with low phosphorous concentration?. Ecological Engineering, 98, 403-409. doi:10.1016/j.ecoleng.2016.05.042

Can limestone, steel slag or man-made sorption materials be used to enhance phosphate-phosphorus retention in treatment wetland for peat extraction runoff with low phosphorous concentration?

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Author: Postila, Heini1; Karjalainen, Satu Maaria2; Kløve, Bjørn
Organizations: 1Water Resources and Environmental Engineering, University of Oulu
2Finnish Environment Institute (SYKE)
Format: article
Version: accepted version
Access: embargoed
Persistent link: http://urn.fi/urn:nbn:fi-fe201803196072
Language: English
Published: Elsevier, 2017
Publish Date: 2018-05-31
Description:

Abstract

This study examined possibilities to enhance phosphorus (P) retention in wetlands using different materials that could enhance removal of phosphate P (PO₄-P) from runoff waters with fairly low P concentrations (Ptot average 80–90 μg L−1 and PO₄-P 25–30 μg L−1) typical for peat extraction runoff. The retention potential of sorption materials, that had previously shown good retention capacity was first studied in laboratory batch tests using steel slag (basic oxygen furnace slag (BOF)), Filtralite®P (high Ca and Mg clay), CFH 12 (ferrihydroxide), limestone, Phoslock® (95% bentonite clay material + 5% lanthanum) and iron gypsum in year 2010. Based on batch test results and material properties (column tests not suitable for fine clay materials such as Phoslock®), steel slag, CFH 12 and iron gypsum products were selected for column tests. The columns experiments were run for almost three months during spring 2011. Steel slag and Phoslock® were selected for further testing in situ in a treatment wetland. In the laboratory set-ups, all materials tested retained PO₄-P (70–90% in batch tests and approximately 10–80% in column experiments). However, in the field scale set-up, neither steel slag nor Phoslock® successfully retained PO₄-P. The reasons may be e.g. for steel slag, too low pH, too large grain size, and too short retention time. Also, for some set-up, the given instruction were not followed during construction works. Further studies are needed to test different particle sizes and new potential materials for retaining P in treatment wetlands with high hydraulic loading rate, low P concentration and low pH.

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Series: Ecological engineering
ISSN: 0925-8574
ISSN-E: 1872-6992
ISSN-L: 0925-8574
Volume: 98
Pages: 403 - 409
DOI: 10.1016/j.ecoleng.2016.05.042
OADOI: https://oadoi.org/10.1016/j.ecoleng.2016.05.042
Type of Publication: A1 Journal article – refereed
Field of Science: 218 Environmental engineering
Subjects:
Funding: These studies were mainly conducted in the project “Round-year treatment of runoff from peat production areas (TuKos)”, which was funded by the European Regional Development Fund and the Centre for Economic Development, Transport and the Environment for North Ostrobothnia. Other funding partners in the project were Vapo Oy, Turveruukki Oy, Kuopion energia Oy, Suomen turvetuottajat ry, Jyväskylän Energia Oy, City of Oulu, Council of Oulu Region and Regional Council of Central Finland. Additional funding was provided by the Finnish Cultural Foundation, K.H Renlund Foundation, Maa- ja vesitekniikan tuki ry, Oulun läänin talousseuran maataloussäätiö, Emil Aaltosen säätiö and Sven Hallin Foundation.
Copyright information: © 2016 Elsevier B.V. All rights reserved. Published in this repository with the kind permission of the publisher.