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Publications (10 of 24) Show all publications
Waara, S., Gajewska, M., Cruz Blázquez, V., Alsbro, R., Norwald, P. & Waara, K.-O. (2015). Long term performance of an FWS wetland for post-tertiary treatment of sewage: the influence of flow, temperature and age on nitrogen removal. In: Gabriela Dotro & Vincent Gagnon (Ed.), Book of Abstracts: 6th International Symposium on Wetland Pollutant Dynamics and Control: Annual Conference of the Constructed Wetland Association: 13th to 18th September, 2015, York, United Kingdom. Paper presented at 6th International Symposium on Wetland Pollution Dynamics and Control, York, United Kingdom, 13th-18th of September, 2015 (pp. 38-39).
Open this publication in new window or tab >>Long term performance of an FWS wetland for post-tertiary treatment of sewage: the influence of flow, temperature and age on nitrogen removal
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2015 (English)In: Book of Abstracts: 6th International Symposium on Wetland Pollutant Dynamics and Control: Annual Conference of the Constructed Wetland Association: 13th to 18th September, 2015, York, United Kingdom / [ed] Gabriela Dotro & Vincent Gagnon, 2015, p. 38-39Conference paper, Oral presentation with published abstract (Other academic)
National Category
Natural Sciences
Identifiers
urn:nbn:se:hh:diva-30137 (URN)
Conference
6th International Symposium on Wetland Pollution Dynamics and Control, York, United Kingdom, 13th-18th of September, 2015
Available from: 2016-01-07 Created: 2016-01-07 Last updated: 2018-03-22Bibliographically approved
Rögnvaldsson, T., Brink, J., Florén, H., Gaspes, V., Holmgren, N., Lutz, M., . . . Sandberg, M. (2014). ARC13 – Assessment of Research and Coproduction: Reports from the assessment of all research at Halmstad University 2013. Halmstad: Halmstad University Press
Open this publication in new window or tab >>ARC13 – Assessment of Research and Coproduction: Reports from the assessment of all research at Halmstad University 2013
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2014 (English)Report (Other (popular science, discussion, etc.))
Abstract [en]

During 2013, an evaluation of all the research conducted at Halmstad University was carried out. The purpose was to assess the quality of the research, coproduction, and collaboration in research, as well as the impact of the research. The evaluation was dubbed the Assessment of Research and Coproduction 2013, or ARC13. (Extract from Executive Summary)

Place, publisher, year, edition, pages
Halmstad: Halmstad University Press, 2014. p. 110
Keywords
Halmstad University, research evaluation, coproduction
National Category
Other Social Sciences not elsewhere specified
Identifiers
urn:nbn:se:hh:diva-24789 (URN)978-91-87045-06-6 (ISBN)978-91-87045-05-9 (ISBN)
Funder
Knowledge Foundation
Available from: 2014-03-10 Created: 2014-03-05 Last updated: 2019-01-24Bibliographically approved
Waara, S. & Bandaruk, T. (2014). Metal and Metalloid Sequestration in a Constructed Wetland System for Treatment of Landfill Leachate During 2003–2012. In: : . Paper presented at Linneaus Eco-Tech '14, Kalmar, Sweden, 24-26 November, 2014.
Open this publication in new window or tab >>Metal and Metalloid Sequestration in a Constructed Wetland System for Treatment of Landfill Leachate During 2003–2012
2014 (English)Conference paper, Published paper (Other academic)
Abstract [en]

The treatment of landfill leachate in constructed wetland systems is a common practice in Europe. However, very few studies were made to evaluate their performance over a long period of time. A free surface constructed wetland system consisting of sediment traps followed by 10 ponds connected with overflows was built at Atleverket near Örebro, Sweden in 2001. It receives pre-treated leachate from the municipal landfill. As part of the wetland monitoring programme a large data set on the surface concentrations of 15 metals and 2 metalloids has been collected from different sampling sites within the wetland during the operation period. In this study, the data from inlet and outlet of the wetland were compiled and analysed. The aim of this paper is therefore to estimate the removal efficiency of metals and metalloids using data on concentrations and flow and investigate the effect of wetland age on removal pattern. The elements with the highest removal efficiency were Al, As, Ba, Ca, Cr, Cu, Fe, Mn, Pb, V and Zn ranging from 95% for Pb to 65 % for Ca. The elements with the lowest reduction were B, Co K, Mg, Ni and S ranging from Co 56 % to 40 % for S. It was found that the removal efficiency was not related to inlet concentrations of the elements as the elements with high and low inlet concentrations were found in both groups. Analysis of reduction pattern also revealed that the group with higher removal efficiency showed fairly constant outlet concentrations during the study period, while the elements with lower removal efficiency demonstrated variable outlet concentrations. No statistical difference in removal due to age of the wetland was found. The study results showed that the wetland system has high removal efficiency of metals and metalloids and the removal pattern is not affected by age of the wetland. The influence on reduction due to leachate characteristics, wetland design and retention time will be discussed.

Keywords
Landfill leachate, Treatment wetlands, Wetland design, Metals and metalloids
National Category
Environmental Sciences related to Agriculture and Land-use
Identifiers
urn:nbn:se:hh:diva-27376 (URN)10.13140/2.1.4824.2241 (DOI)
Conference
Linneaus Eco-Tech '14, Kalmar, Sweden, 24-26 November, 2014
Available from: 2015-01-02 Created: 2015-01-02 Last updated: 2018-01-11Bibliographically approved
Waara, S., Gajewska, M., Dvarioniene, J., Ehde, P. M., Gajewski, R., Grabowski, P., . . . Wojciechowska, E. (2014). Towards Recommendations for Design of Wetlands for Post-Tertiary Treatment of Waste Water in the Baltic Sea Region – Gdańsk Case Study. In: : . Paper presented at Linneaus Eco-Tech '14, Kalmar, Sweden, 24-26 November, 2014.
Open this publication in new window or tab >>Towards Recommendations for Design of Wetlands for Post-Tertiary Treatment of Waste Water in the Baltic Sea Region – Gdańsk Case Study
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2014 (English)Conference paper, Published paper (Other academic)
Abstract [en]

There are many challenges that need to be addressed if the far reaching objectives on high environmental status as required in the EU Water Framework Directive and the Marine Strategy Framework Directive will be met in the Baltic Sea Region within the next decade. For wastewater treatment plants (WWTP) this implies, in spite of the many improvements made during the last decade, development and introduction of new technology to further reduce eutrophying compounds, hazardous chemicals and pharmaceuticals. Constructed wetlands when properly designed and operated have been shown to be robust systems with low energy requirements that may not only reduce many types of pollutants but may also provide many additional ecosystem services beyond requirements generally imposed by authorities. For example, they may support and enhance biodiversity and be used to convert brownfield areas in urban landscapes to recreational areas. Reduced cost is possible if treated water is reused in industry or for irrigation. In a project, supported by the Swedish Institute, a group of scientists, a water company and water using industry has together with local authorities through workshops, field studies and literature studies worked on finding a general first recommendation on design and operation. In this paper we will present the scientific rational and legal constraints for the general design and operation of a wetland system for post-tertiary treatment of waste water from WWTPs using Gdańsk as an example. The proposal includes a first part, which mainly will be focusing on pollutant and pathogen removal using particle traps and a HSSF wetland on land owned by the WWTP and a second part consisting of a FWS wetland which, in addition to further polishing the water, will enhance biodiversity and provide recreational areas on derelict land owned by the city.

Keywords
discharge limits, ecosystem services, sustainable cities, treatment wetlands, waste water
National Category
Environmental Management
Identifiers
urn:nbn:se:hh:diva-27377 (URN)10.13140/2.1.1140.5123 (DOI)
Conference
Linneaus Eco-Tech '14, Kalmar, Sweden, 24-26 November, 2014
Projects
WETEFF: Towards recommendation for design, operation and monitoring of constructed wetlands for treatment of effluent from waste water treatment plants in the Baltic Sea Region
Note

Financial support: Swedish Institute

Available from: 2015-01-02 Created: 2015-01-02 Last updated: 2017-03-27Bibliographically approved
Huerta Buitrago, B., Ferrer Munoz, P., Ribé, V., Larsson, M., Engwall, M., Wojciechowska, E. & Waara, S. (2013). Hazard assessment of sediments from a wetland system for treatment of landfill leachate using bioassays. Ecotoxicology and Environmental Safety, 97, 255-262
Open this publication in new window or tab >>Hazard assessment of sediments from a wetland system for treatment of landfill leachate using bioassays
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2013 (English)In: Ecotoxicology and Environmental Safety, ISSN 0147-6513, E-ISSN 1090-2414, Vol. 97, p. 255-262Article in journal (Refereed) Published
Abstract [en]

Four bioassays were used in this study for the hazard assessment of sediments from sediment traps and several ponds in a treatment wetland for landfill leachate at Atleverket, Sweden. In the 6-day solid phase microbiotest with the sediment-dwelling crustacean Heterocypris incongruens both acute and chronic effects were observed with a gradual decrease and loss of toxicity with treatment in the wetland system. Some samples showed a low toxicity in porewater and only one sample was weakly toxic in the whole sediment test when assessed with Aliivibrio fischeri (Vibro fischeri). No genotoxicity was detected in the umu test. The toxicity response in the H4IIE- luc test evaluating the presence of dioxin-like compounds was considerably higher in the samples from the sediment traps. The hazard of the sediment therefore appears to be highest in the sediment traps and pond 1 with the methods employed. The result indicates that the wetland system has a design supporting the concentration and sequestration of toxic substances in the first part of the wetland. Based upon the results we suggest that hazard assessment of sediments from other treatment wetlands for landfill leachate should be conducted. (c) 2013 Elsevier Inc. All rights reserved.

Place, publisher, year, edition, pages
Maryland Heights, MO: Elsevier, 2013
Keywords
bioassay, genotoxicity, toxicity, tretment wetland, landfill leachate, sediment
National Category
Environmental Sciences related to Agriculture and Land-use
Identifiers
urn:nbn:se:hh:diva-24322 (URN)10.1016/j.ecoenv.2013.08.010 (DOI)000325039400034 ()2-s2.0-84884210539 (Scopus ID)
Available from: 2014-01-07 Created: 2014-01-07 Last updated: 2018-01-11Bibliographically approved
Waara, S. (2013). Landfill Leachate Ecotoxicity. In: Jean-François Férard & Christian Blaise (Ed.), Encyclopedia of Aquatic Ecotoxicology: (pp. 649-670). Dordrecht: Springer
Open this publication in new window or tab >>Landfill Leachate Ecotoxicity
2013 (English)In: Encyclopedia of Aquatic Ecotoxicology / [ed] Jean-François Férard & Christian Blaise, Dordrecht: Springer, 2013, p. 649-670Chapter in book (Refereed)
Place, publisher, year, edition, pages
Dordrecht: Springer, 2013
Keywords
landfill leachate, ecotoxicity, biotests, genotoxicity, antiestrogenicity, estrogenicity, confounding factors
National Category
Natural Sciences
Identifiers
urn:nbn:se:hh:diva-24320 (URN)10.1007/978-94-007-5704-2 (DOI)9789400750401 (ISBN)
Available from: 2014-01-07 Created: 2014-01-07 Last updated: 2016-01-11Bibliographically approved
Elgh-Dalgren, K., Arwidsson, Z., Ribé, V., Waara, S., von Kronhelm, T. & van Hees, P. A. W. (2011). Bioremediation of a Soil Industrially Contaminated by Wood Preservatives–Degradation of Polycyclic Aromatic Hydrocarbons and Monitoring of Coupled Arsenic Translocation. Water, Air and Soil Pollution, 214(1-4), 275-285
Open this publication in new window or tab >>Bioremediation of a Soil Industrially Contaminated by Wood Preservatives–Degradation of Polycyclic Aromatic Hydrocarbons and Monitoring of Coupled Arsenic Translocation
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2011 (English)In: Water, Air and Soil Pollution, ISSN 0049-6979, E-ISSN 1573-2932, Vol. 214, no 1-4, p. 275-285Article in journal (Refereed) Published
Abstract [en]

Two commercially available aerobic bioremediation methods (Daramend® and BioSan) were utilized to study the aerobic biodegradation of polycyclic aromatic hydrocarbons (PAH) and the effect of the simultaneously present arsenic. The soil was collected at an old wood preservation site, and the initial PAH16-concentration was 46 mg/kg, with mainly high molecular weight congeners. The As concentration was 105 mg/kg with low availability as assessed with sequential extraction. To enhance the availability of PAH, the effect of a nonionic surfactant was evaluated. Degradation of both low and high molecular weight PAH was observed; however, after 30 weeks, the degradation was generally low and no treatment was significantly better than the others. The treatments had, on the other hand, an effect on As remobilization, with increased As concentration in the available fraction after treatment. This may be due to both the microbial activity and the presence of anoxic microsites in the soil. The overall efficiency of the biological treatment was further evaluated using the standardized ecotoxicity test utilizing Vibrio fischeri (Microtox®). The toxicity test demonstrated that the bioremediation led to an increase in toxicity, especially in treatments receiving surfactant. The surfactant implied an increase in contaminant availability but also a decrease in surface tension, which might have contributed to the overall toxicity increase. © 2010 Springer Science+Business Media B.V.

Place, publisher, year, edition, pages
Dordrecht: Springer Netherlands, 2011
Keywords
Arsenic, Bioremediation, Microtox®, PAH, Surfactant
National Category
Natural Sciences
Identifiers
urn:nbn:se:hh:diva-23570 (URN)10.1007/s11270-010-0422-0 (DOI)000285468800023 ()2-s2.0-78650592420 (Scopus ID)
Funder
Knowledge Foundation
Available from: 2012-10-11 Created: 2013-09-17 Last updated: 2017-12-06Bibliographically approved
Waara, S. & Wojciechowska, E. (2011). Distribution and removal efficiency of heavy metals in two constructed wetlands treating landfill leachate. Water Science and Technology, 64(8), 1597-1606
Open this publication in new window or tab >>Distribution and removal efficiency of heavy metals in two constructed wetlands treating landfill leachate
2011 (English)In: Water Science and Technology, ISSN 0273-1223, E-ISSN 1996-9732, Vol. 64, no 8, p. 1597-1606Article in journal (Refereed) Published
Abstract [en]

The results of heavy metals (Fe, Mn, Zn, Ni, Cu, Cr, Pb, Cd) removal and partitioning between aqueous and solid phases at two treatment wetlands (TWs) treating municipal landfill leachates are presented. One of the TWs is a surface flow facility consisting of 10 ponds. The other TW is a newly constructed pilot-scale facility consisting of three beds with alternately vertical and horizontal sub-surface flow. The metals concentrations were analysed in leachate (both TWs) and bottom sediments (surface flow TW). Very high (90.9-99.9%) removal rates of metals were observed in a mature surface flow TW. The effectiveness of metals removal in a newly constructed pilot-scale sub-surface flow wetland were considerably lower (range 0-73%). This is attributed to young age of the TW, different hydraulic conditions (sub-surface flow system with much shorter retention time, unoxic conditions) and presence of metallic complexes with refractory organic matter

Place, publisher, year, edition, pages
London: IWA Publishing, 2011
Keywords
organo-metallic complexes, partitioning, prescipitation, redox conditions
National Category
Engineering and Technology
Identifiers
urn:nbn:se:hh:diva-16582 (URN)10.2166/wst.2011.680 (DOI)000296564600004 ()2-s2.0-80054886975 (Scopus ID)
Projects
Process- och resursoptimering av konstruerade akvatiska system
Available from: 2011-11-21 Created: 2011-11-21 Last updated: 2017-12-08Bibliographically approved
Waara, S. & Khokhotva, O. (2011). The effect of environmental conditions on the stability of heavy meltal-filter material complex as assessed by the leaching of adsorbed metal ions. Environmental Pollution, 159, 146-1463
Open this publication in new window or tab >>The effect of environmental conditions on the stability of heavy meltal-filter material complex as assessed by the leaching of adsorbed metal ions
2011 (English)In: Environmental Pollution, ISSN 0269-7491, E-ISSN 1873-6424, Vol. 159, p. 146-1463Article in journal (Refereed) Published
Abstract [en]

In this study the influence of environmental conditions, most likely prevailing in filter beds used for intermittently discharged pollutant streams such as landfill leachate and storm water, on the stability of the heavy metalefilter complex was investigated for 2 filter materials; non-treated and urea treated pine bark, using leaching experiments. The metalefilter complex stability was higher for urea treated than for non-treated pine bark and dependent on the metal adsorbed. The type of environmental condition applied was of less importance for the extent of leaching.

Place, publisher, year, edition, pages
Elsevier, 2011
Keywords
reactive filters, sorbents, copper, nickel, zinc
National Category
Environmental Sciences Other Environmental Engineering
Identifiers
urn:nbn:se:hh:diva-16011 (URN)10.1016/j.envpol.2011.02.020 (DOI)000290839900001 ()2-s2.0-79955086525 (Scopus ID)
Projects
Process and resource optimization in water treatment
Available from: 2011-09-07 Created: 2011-08-29 Last updated: 2017-12-08Bibliographically approved
Waara, S. (2010). Dagvattnets sammansättning i Västerås stad - En kunskapssammanställning. Västerås: Länsstyrelsen i Västmanlands län
Open this publication in new window or tab >>Dagvattnets sammansättning i Västerås stad - En kunskapssammanställning
2010 (Swedish)Report (Other academic)
Place, publisher, year, edition, pages
Västerås: Länsstyrelsen i Västmanlands län, 2010. p. 38
Series
Länsstyrelsens Rapportserie, Länsstyrelsen i Västmanland, ISSN 0284-8813 ; 2010:11
Keywords
reningsbehov, dagvattendammar, Vallby, Hamre, toxicitet, fysikalisk-kemisk karaktärisering
National Category
Other Environmental Engineering
Identifiers
urn:nbn:se:hh:diva-16009 (URN)
Projects
Utveckling och utvärdering av konstruerade akvatiska system
Available from: 2011-09-07 Created: 2011-08-29 Last updated: 2016-01-11Bibliographically approved
Organisations
Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0003-0553-7918

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