Research and application status of ecological floating bed in eutrophic landscape water restoration

Wang, Wen-Huai; Wang, Yi; Sun, Lu-Qin; Zheng, Yucong; Zhao, Jingchan

doi:10.1016/j.scitotenv.2019.135434

Cited by 77 publications

(30 citation statements)

References 103 publications

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“…Existing floating constructions for emergent macrophytes are manufactured mostly from artificial materials, like polyethylene, polypropylene, polyurethane or polyvinyl alcohol foam (Table 1). This is congruent to findings by Wang et al (2020): The authors reviewed the main component elements of ecological floating beds applied in scientific studies and none were without artificial polymers.…”

Section: Floating Construction Designsupporting

confidence: 85%

“…However, data on long-term water transparency progress around floating wetlands is currently lacking and should be included in future evaluations. Besides direct plant uptake, microbial transformation and sedimentation contribute significantly to nutrient removal (Wang et al 2020). Plant roots create favorable habitats for microorganisms and this biofilm development boosts phosphorus and nitrogen removal (Haberl et al 2003;Stottmeister et al 2003;Wang et al 2020).…”

Section: Biodiversity and Remediation Of Eutrophicationmentioning

confidence: 99%

“…Besides direct plant uptake, microbial transformation and sedimentation contribute significantly to nutrient removal (Wang et al 2020). Plant roots create favorable habitats for microorganisms and this biofilm development boosts phosphorus and nitrogen removal (Haberl et al 2003;Stottmeister et al 2003;Wang et al 2020). A larger root network results in the increase of surface area for biofilm development (Muench et al 2007).…”

Section: Biodiversity and Remediation Of Eutrophicationmentioning

confidence: 99%

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Constructed floating wetlands made of natural materials as habitats in eutrophicated coastal lagoons in the Southern Baltic Sea

Karstens¹,

Langer²,

Nyunoya

et al. 2021

J Coast Conserv

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Eutrophication remains an environmental challenge in lagoons along the Southern Baltic Sea. Floating islands planted with emergent macrophytes are an option to remove nutrients from eutrophicated waters. Furthermore, floating wetlands offer other ecosystem services such as the provision of habitats. Numerous scientific studies have been conducted; however most remain on the laboratory scale. This research explores the challenges associated with installations in coastal environments and focuses on sustainability of the island design, the habitat function as well as nutrient removal. Most floating wetland designs use polyethylene, polypropylene, polyurethane or polyvinyl alcohol foam to ensure the buoyancy. For this study an artificial polymer free island design was developed and tested. The floating constructions in the Darss-Zingst-Bodden-Chain were planted with native macrophytes which have the potential to act as ‘biodiversity-supplements’ to the adjacent coastal wetlands: Bolboschoenus maritimus, Carex acutiformis, Iris pseudacorus, Juncus effesus, Lythrum salicaria, Schoenoplectus lacustris, Typha latifolia. The chosen macrophytes survived fluctuating salinities. After three months the above-ground biomass was harvested and analyzed for the nutrient concentrations. Phosphorus concentrations were highest in L. salicaria and nitrogen in I. pseudacorus. Video monitoring and field observations were applied in order to observe animals. Birds did not use the floating wetlands as breeding grounds, but the grey heron (Ardea cinerea) was a common visitor for foraging. Especially surprising was the large amount of juvenile eels (Anguilla anguilla). A diverse and large root network below the floating islands boosts not only nutrient removal but serves as a shelter and refuge for fish such as the endangered eel.

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Section: Floating Construction Designsupporting

confidence: 85%

Section: Biodiversity and Remediation Of Eutrophicationmentioning

confidence: 99%

Section: Biodiversity and Remediation Of Eutrophicationmentioning

confidence: 99%

See 1 more Smart Citation

Constructed floating wetlands made of natural materials as habitats in eutrophicated coastal lagoons in the Southern Baltic Sea

Karstens¹,

Langer²,

Nyunoya

et al. 2021

J Coast Conserv

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“…The plants in integrated floating beds grow in a hydroponic floating mass on the surface of water bodies, and the microbes are fixed mainly on the fiber fillers and plant roots (Li et al, 2010;Liu et al, 2016a). Integrated floating bed has been increasingly researched and applied to control the water eutrophication with the advantages of low investment, high efficiency, no additional land occupation, and flexible operation (Gottschall et al, 2007;Wang et al, 2020a). Wu et al (2016) established the enhanced ecological floating beds with total nitrogen (TN), ammonium nitrogen (NH 4 + -N), nitrate nitrogen (NO 3 − -N), total phosphorus (TP), and chemical oxygen demand (COD Cr ) removal efficiencies of 49.3, 49.2, 69.5, 48.7, and 70.6%, respectively.…”

Section: Introductionmentioning

confidence: 99%

“…Water purification would be achieved via the integrated floating bed with comprehensive effects of plant absorption, microbial degradation, and others (Wang et al, 2020a). Integrated floating beds have been applied in many fieldscale river remediation projects, and the water purification processes indicated the synergistic effects of plants and microbes (Chang et al, 2012;Wang and Sample, 2014;Wang et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

Synergistic Action of Plants and Microorganism in Integrated Floating Bed on Eutrophic Brackish Water Purification in Coastal Estuary Areas

et al. 2021

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Eutrophic water bodies in coastal estuary areas usually show saline-alkaline characteristics influenced by tides. The purification performance of traditional planted floating beds in this water body is limited because of the poor growth of plants. A novel integrated floating bed with plants (Iris pseudoacorus), fillers (volcanic rocks and zeolites), and microbes named PFM was established, and the pollutant removal performance was studied. Results showed that the average ammonia nitrogen (NH4+-N), total nitrogen (TN), total phosphorus (TP), and permanganate index (CODMn) removal efficiencies of PFM were higher with the value of 81.9, 78.5, 53.7, and 72.4%, respectively, when compared with the other floating beds containing plants (P), fillers (F), microbes (M), and plants and fillers (PF) in this study. Therein, the most of NH4+-N (30.1%), TN (27.9%), TP (22.5%), and CODMn (43.6%) were removed by microbes, higher than those removed by plants and fillers. Analysis of the microbial community revealed that the establishment of PFM led to a higher microbial richness than M, and Acinetobacter, as the main microbes with the function of salt tolerance and denitrification, were dominated in PFM with a relative abundance of 6.8%. It was inferred that the plants and fillers might enrich more salt-tolerance microbes for pollutants removal, and microbes favored the growth of plants via degradation of macromolecular substrates. Synergistic actions in the process of eutrophic brackish water purification were established. This study provided an idea for the application of integrated floating bed in eutrophic and brackish water bodies purification in coastal estuary areas.

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An assessment of nutrient removal by harvesting constructed floating wetlands in two coastal lagoons in the SE Baltic Sea

Lesutienė,

Bielecka,

Petkuvienė

et al. 2024

Ecohydrology

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In the last decades, so‐called internal or sea‐based mitigation measures have been suggested as nature‐based solutions to remove nutrients and improve water quality in semi‐enclosed coastal waters. However, these have rarely been tested in the field, especially in colder climates where winter ice cover is common. The aim of this experimental research was to investigate plant growth conditions in such an environment, as well to estimate nutrient removal capacity by harvesting constructed floating wetlands (CFWs). We tested small (24–28 m2) CFWs (Biomatrix®, Scotland, UK) at two demonstration sites: the Curonian lagoon (CL, Lithuania) and Szczecin lagoon (SL, Poland). In the CL, CFWs were planted predominantly with Carex acutiformes (Ehrh.), while the SL CFW was planted mainly with the reed Phragmites australis (Cav.) Trin. ex Steud. We aimed to test the amount of nutrient removal by plant harvesting over three subsequent years (2019–2021). We investigated carbon storage capacity and plant nutrient stoichiometry as indicators of potential nutrient limitation in the brackish coastal waters. Plant biomass increased annually, stabilising at 2.5–3.7 kg wet weight m−2. The total nutrient uptake per installed island area varied with the plant species composition. In the successive years, the harvested plants from the CL CFW dominated by Carex accumulated 10.4–13.1 g N m−2, 0.6–0.8 g P m−2 and 318–431 g C m−2 per year. The harvest from the SL CFW dominated by Phragmites contained a two‐times higher amount of nutrients, the respective figures being 21.2 g N m−2, 1.6 g P m−2 and 704 g C m−2. The nutrient stoichiometry in the vegetation did not suggest the presence of sub‐optimal growth conditions due to nitrogen limitation. However, the CL's dissolved nutrient supply was very low during the summer cyanobacteria bloom and indicated a severe nitrogen deficiency (as reflected in the dissolved inorganic nitrogen:dissolved inorganic phosphorus [DIN:DIP] molar ratio of 6). We suggest that to maximise nutrient removal capacity, tall plants with high biomass should be selected and/or plants with fine root systems to efficiently uptake the limiting nutrient from the water.

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Research and application status of ecological floating bed in eutrophic landscape water restoration

Cited by 77 publications

References 103 publications

Constructed floating wetlands made of natural materials as habitats in eutrophicated coastal lagoons in the Southern Baltic Sea

Constructed floating wetlands made of natural materials as habitats in eutrophicated coastal lagoons in the Southern Baltic Sea

Synergistic Action of Plants and Microorganism in Integrated Floating Bed on Eutrophic Brackish Water Purification in Coastal Estuary Areas

An assessment of nutrient removal by harvesting constructed floating wetlands in two coastal lagoons in the SE Baltic Sea

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