Phosphorus removal efficiency by in-stream constructed wetlands treating agricultural runoff: Influence of vegetation and design

Kill, Keit; Grinberga, Linda; Koskiaho, Jari; Mander, Ülo; Wahlroos, O; Lauva, Didzis; Pärn, Jaan; Kasak, Kuno

doi:10.1016/j.ecoleng.2022.106664

Cited by 17 publications

(5 citation statements)

References 45 publications

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“…Vegetation has several positive effects on nutrient retention, including both denitrification and reduction of nutrients by direct uptake (Fraser et al, 2004). Vegetation also reduces the turbulence of the water and thus increases the retention time of the water, and facilitates sedimentation, as it mitigates the resuspension of particles and sediment (Braskerud, 2001; Gargallo et al, 2017; Jadhav & Buchberger, 1995; Kill et al, 2022), which is important for TP retention. Although most wetlands in our study were young, previous studies have shown that after only 3 years there is often a high abundance of vegetation and plant species colonizing the wetland (Mitsch et al, 2012).…”

Section: Discussionmentioning

confidence: 99%

“…However, with more knowledge about the benefits of wetlands (Hoffmann & Baattrup‐Pedersen, 2007; Mitsch & Gosselink, 2000; Scholz & Lee, 2005; Varma et al, 2021; Verhoeven & Setter, 2010; Zedler, 2003), an increased interest in restoring and constructing wetlands has arisen. Wetlands in the agricultural landscape, both constructed and restored, have the potential to significantly reduce transport of nitrogen (N) and phosphorus (P) indicating that wetlands could be a useful local‐scale management tool to counteract eutrophication (Cheng et al, 2020; Ge et al, 2019; Johannesson et al, 2015; Kill et al, 2022; Land et al, 2016; Lu et al, 2009). For example, studies have shown that a 5%–10% increase in wetland area may reduce N transport by up to 50% (Arheimer & Wittgren, 1994; Cheng et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

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Wetlands as a potential multifunctioning tool to mitigate eutrophication and brownification

Borgström,

Hansson,

Klante

et al. 2024

Ecological Applications

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Eutrophication and brownification are ongoing environmental problems affecting aquatic ecosystems. Due to anthropogenic changes, increasing amounts of organic and inorganic compounds are entering aquatic systems from surrounding catchment areas, increasing both nutrients, total organic carbon (TOC), and water color with societal, as well as ecological consequences. Several studies have focused on the ability of wetlands to reduce nutrients, whereas data on their potential to reduce TOC and water color are scarce. Here we evaluate wetlands as a potential multifunctional tool for mitigating both eutrophication and brownification. Therefore, we performed a study for 18 months in nine wetlands allowing us to estimate the reduction in concentrations of total nitrogen (TN), total phosphorus (TP), TOC and water color. We show that wetland reduction efficiency with respect to these variables was generally higher during summer, but many of the wetlands were also efficient during winter. We also show that some, but not all, wetlands have the potential to reduce TOC, water color and nutrients simultaneously. However, the generalist wetlands that reduced all four parameters were less efficient in reducing each of them than the specialist wetlands that only reduced one or two parameters. In a broader context, generalist wetlands have the potential to function as multifunctional tools to mitigate both eutrophication and brownification of aquatic systems. However, further research is needed to assess the design of the generalist wetlands and to investigate the potential of using several specialist wetlands in the same catchment.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Wetlands as a potential multifunctioning tool to mitigate eutrophication and brownification

Borgström,

Hansson,

Klante

et al. 2024

Ecological Applications

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“…A constructed wetland (CW) is a kind of water treatment technology with low operating costs and high eco-efficiency [10], and has been successfully used to remove various pollutants, such as organic compounds, inorganic nutrients, and heavy metals, as well as having a relatively good treatment effect. Grinberga et al [11] reported that efficient removal of phosphorus could be achieved by planting dense vegetation in constructed wetlands. However, a single constructed wetland had a rather limited treatment effect especially in the cases of low organic content and high nitrate nitrogen concentration.…”

Section: Introductionmentioning

confidence: 99%

Enhanced Nitrate Nitrogen Removal from Constructed Wetland via Fe3O4/Granular Activated Carbon Anode Microbial Electrolysis Cell under Low C/N Ratio

Yang,

Tan,

Huang

et al. 2024

Water

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In this study, a constructed wetland–Fe3O4/granular activated carbon anode microbial electrolysis cell (CW-FMEC) was constructed to enhance denitrification in low COD/N ratio wastewater. The introduction of Fe3O4 boosted the expression of functional genes involved in the denitrification pathway, and the abundance of narG, nirS, and nosZ increased by 99.29%, 70.54%, and 132.18%, respectively, compared to CW. In addition, the content of c-type cytochromes (c-Cyts) and EPS were also enhanced in the CW-FMEC. The microbial communities study displayed that Thauera, Dechloromonas, and Arenimonas became the main genera for denitrification. The denitrification performance at different COD/N ratios was investigated in depth. Under optimal working circumstances, the CW-FMEC had an excellent nitrate removal rate (88.9% ± 1.12%) while accumulating nearly no NO2−-N or NH4+-N in the effluent. This study provides a new direction for the development of CW-MEC and accelerates its implementation.

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“…Mitrājā Mežacīruļos par vienu no zemas efektivitātes iemesliem fosfora savienojumu aizturēšanā varētu būt neliels veģetācijas daudzums un nevienmērīgs noklājums pa mitrāja platību. Šāda atziņa izdarīta pētījumā par dažādu vides parametru ietekmi uz fosfora savienojumu aizturēšanu, analizējot monitoringa datus no pieciem virszemes plūsmas mākslīgajiem mitrājiem Baltijas jūras reģionā, iekļaujot arī pētījumu objektu Mežacīruļos (Kill et al, 2022). Galvenā atziņa tika izdarīta, ka fosfora savienojumu aizturēšanu ietekmē drīzāk blīva un nobriedusi veģetācija un mazāk sateces baseina un spoguļa virsmas attiecība.…”

Section: Att Vidējās Kopējā Fosfora Koncentrācijas Un Standartkļūdas ...unclassified

“…Kill et al, 2022). Virszemes plūsmas mākslīgais mitrājs Mežacīruļos demonstrē veģetācijas kritisko nozīmi attiecībā uz fosfora savienojumu aizturēšanas spēju.3.5.…”

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Ūdeņu kvalitātes uzlabošanas efektivitāte un risinājumi mākslīgajos mitrājos Latvijā = The Efficiency and Solutionsfor Water Quality Improvementin Constructed Wetlands in Latvia

Grinberga¹

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Grinberga L. The Efficiency and Solutions for Water Quality Improvement in Constructed Wetlands in Latvia: dissertation to receive scientiffic doctoral degree (Ph. D.). Jelgava, Latvia University of Life Sciences and Technologies, 2022. 118 p, 72 pictures, 6 tables, 96 inform. souces. The dissertation prepared by Linda Grinberga “The Efficiency and Solutions for Water Quality Improvement in Constructed Wetlands in Latvia” is based on the topicality to examine the environmentally oriented and nature-based biological method for water quality improvement. Constructed wetlands are well known in different countries and include widely used method for water treatment, but in Latvia wetlands haven`t been proved as surely effective. Constructed wetlands are the wastewater treatment method based on physical, biological and biochemical processes and doesn’t require electricity. The first chapter of the dissertation provides an overview of the possibilities of using constructed wetlands in treating different types of wastewater. Various constructive solutions of wetlands are provided according to the conditions and needs in Latvia. The research is based on the data from two objects in study site Mezaciruli, were two separate constructed wetlands were designed, built and operated, and one monitoring object with constructed wetland in the study site Zante. All the information of the study sites, monitoring data and methods are described in the second chapter of the dissertation. In the chapter of results and discussion the efficiency of nutrient removal in study sites is analysed and the impact of climate, maintenance and conditions of Latvia on the removal efficiency is investigated. The average reduction of concentrations of ammonia nitrogen, nitrate nitrogen and total nitrogen was observed by 17%, 67% and 54%, respectively, in the subsurface flow constructed wetland. During the study period in the surface flow constructed wetland in Mezaciruli the average concentrations of nitrate nitrogen, ammonia nitrogen and total nitrogen were reduced by 10%, 24% and 9%, respectively. The median and average concentrations of nitrogen compounds showed an increase in the surface flow constructed wetland in Zante. The average concentrations of orthophosphate phosphorous and total phosphorus were reduced by 67% and 72% in the subsurface flow constructed wetland, and decreases by 5% to 27% in the surface flow wetlands in Mezaciruli, and with no changes in Zante. The concentrations of suspended solids were reduced on average by 62% at the subsurface flow wetland and by 11% at the surface flow constructed wetland in Mezaciruli, and by 8% in Zante. The median value for biochemical oxygen demand and chemical oxygen demand concentrations decreased by 91% and 83%, respectively. Based on the efficiency of constructed wetlands observed during this study at the monitoring sites, the methodology for calculations of the dimensions of constructed wetlands has been approbated and a calculation algorithm model for dimensions has been developed. The aim of the study Based on the empirical observations at the study sites, to approbate the technical solutions and develop dimensioning methodology of constructed wetlands in Latvia in order to reduce water pollution caused by economic activities. Research objectives 1. To evaluate the possibilities of application of different design constructed wetlands in Latvia according to origin, composition and volume of various wastewaters. 2. To determine and analyse the reduction of pollutants including nitrogen and phosphorus compounds, suspended solids, biochemical and chemical oxygen demand after wastewater treatment in constructed wetland. 3. To evaluate the efficiency of pollutant reduction in two different types of constructed wetlands considering the most significant geographical and physical influencing factors 4. To develop and apply a calculation methodology and tool for the constructed wetlands to improve the quality of different types, volume and content of wastewater. Research hypotheses Properly designed and dimensioned constructed wetlands improve water quality by reducing the concentrations of one or several pollutants in the water. Key words: Constructed wetland, wastewater treatment, water quality.

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Phosphorus removal efficiency by in-stream constructed wetlands treating agricultural runoff: Influence of vegetation and design

Cited by 17 publications

References 45 publications

Wetlands as a potential multifunctioning tool to mitigate eutrophication and brownification

Wetlands as a potential multifunctioning tool to mitigate eutrophication and brownification

Enhanced Nitrate Nitrogen Removal from Constructed Wetland via Fe3O4/Granular Activated Carbon Anode Microbial Electrolysis Cell under Low C/N Ratio

Ūdeņu kvalitātes uzlabošanas efektivitāte un risinājumi mākslīgajos mitrājos Latvijā = The Efficiency and Solutionsfor Water Quality Improvementin Constructed Wetlands in Latvia

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