Study on new artificial floating island removing pollutants

Kong, Lingwei; Wang, Lu; Wang, Qirui; Mei, Rongwu; Yang, Yifan

doi:10.1007/s11356-019-05164-4

Cited by 18 publications

(6 citation statements)

References 20 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In general, an artificial floating island is a eutrophic water purification technology used for decontamination and ecological remediation due to the landscape effects. It works as a natural evolution of artificial wetlands or green filters, which has a history of nearly 40 years (Kong et al, 2019;Largo et al, 2020; Prashant and Billore, 2020; Ren et al, 2021). In this work, the aerogel blankets could be used as self-floating islands and as movable platforms for supporting or transporting goods and materials, rather than constructions for water purification.…”

Section: Resultsmentioning

confidence: 99%

Robust Silica–Polyimide Aerogel Blanket for Water-Proof and Flame-Retardant Self-Floating Artificial Island

Liu¹,

Wang²,

Liao³

et al. 2021

Front. Mater.

View full text Add to dashboard Cite

A robust silica–polyimide (PI) aerogel blanket is designed and synthesized using the PI foam as the matrix and silica aerogel as the filler through an in situ method, where sol–gel transition of silica precursor occurs in pores of the PI foam, followed by the hydrophobization and ambient pressure drying. The density of the aerogel blanket ranges from 0.036 to 0.196 g/cm3, and the low density is directly controlled by tailoring the silica concentration. The specific surface area of the aerogel blanket reaches 728 m2/g. These features of the blanket result in a low thermal conductivity of 0.018 W/mK, which shows a remarkable reduction of 59% compared to that of the PI foam (0.044 W/mK). As a result, a remarkable decrease of 138°C is achieved using the silica blanket as the thermal insulator on a hot plate of approximately 250°C. In addition, the temperature degradation of the blanket is around 500°C, and up to 86% of mass remaining at 900°C is obtained. The blanket is resistant at extremely harsh conditions, e.g., 600°C for 30 min and 1,300°C for 1 min, and no open flame is observed, suggesting a significant flame-retardant of the blanket. Owing to the three-dimensional (3D) porous framework of the PI foam, the silica aerogel is encapsulated in the PI foam and the blanket exhibits strong mechanical property. The silica–PI aerogel can be reversibly compressed for 50 cycles without reduction of strain. The contact angle of the blanket is 153°, which shows a superior waterproof property. Combining with the low density, low thermal conductivity, flame-retardant, and strong mechanical strength, the aerogel blanket has the potential as an artificial island, which is safe (waterproof and flame-retardant), lightweight, comfortable, and easy to be moved.

show abstract

Section: Resultsmentioning

confidence: 99%

Robust Silica–Polyimide Aerogel Blanket for Water-Proof and Flame-Retardant Self-Floating Artificial Island

Liu¹,

Wang²,

Liao³

et al. 2021

Front. Mater.

View full text Add to dashboard Cite

show abstract

“…An arti cial oating island is an ecological restoration technology aimed at creating sustainable ecosystems conducive to enhancement or restoration of biodiversity (Ware,Callaway 2019). The approach has proved to be remarkably effective in the treatment of polluted rivers, lakes, and reservoirs (Kong et al 2019). The strategy is advantageous in being space e cient compared with the spatial requirements of an arti cial wetland (Guo et al 2019).…”

Section: Introductionmentioning

confidence: 99%

“…The strategy is advantageous in being space e cient compared with the spatial requirements of an arti cial wetland (Guo et al 2019). Arti cial oating island systems remove pollutants through absorption by aquatic plant roots, and mitigates nitrogen and phosphorus enrichment in the water by means of microbial degradation (Hubbard et al 2011;Kong et al 2019;Sun et al 2009). Many biopolymers, such as proteins, nucleic acids, and polysaccharides, cannot be transported across cell membranes and used directly by microorganisms in wastewater (Gonnelli et al 2013).…”

Section: Introductionmentioning

confidence: 99%

Purification Efficiency of Eight Aquatic Plant Species in an Artificial Floating Island System in Relation to Extracellular Enzyme Activity and Microbial Community

Chen¹,

Feng²,

Li³

et al. 2021

Preprint

View full text Add to dashboard Cite

An artificial floating island is an ecological restoration technology that aims to create sustainable ecosystems and improve biodiversity. Aquatic plants play an important role in wastewater purification. The floating island system exploits the combination of aquatic plants, microorganisms, and extracellular enzymes to purify wastewater. We investigated the purification efficiency of eight aquatic plant species (Ceratophyllum demersum, Elodea nuttallii, Eichhornia crassipes, lris pseudacorus, lris sibirica, Myriophyllum verticillatum, Thalia dealbata and Oenanthe javanica) cultured in wastewater. The relationships of plant purification capacity with extracellular enzyme activity and microbial community were analyzed to explore the crucial factors that affect the plant purification capacity and the mechanism of pollutants removal in different plant systems. Three plant species, namely Oenanthe javanica, Thalia dealbata, and lris pseudacorus, were the most effective for purification of ammonium-nitrogen (NH4+-N), total phosphate (TP), and chemical oxygen demand (COD) with maximum efficiencies of 76.09%, 85.87%, and 89.10%, respectively. Urease, alkaline phosphatase (AP), and β-glucosidase activities were significantly and positively correlated with root system development (P < 0.05). Activities of urease and AP were positively correlated with NH4+-N and TP removal, respectively. The magnitude of urease and AP activity was generally consistent with the plant’s capacity to remove NH4+-N and TP. β-Glucosidase activity and COD removal were not significantly correlated. The dominant microbial phylum in each species treatment was Proteobacteria. Alphaproteobacteria and Bacteroidia showed > 1% relative abundance and greater involvement in degradation of pollutants in the experimental system. The results provide a scientific and theoretical basis for improvement of the plant purification efficiency of artificial floating island systems.

show abstract

“…An artificial floating island is an ecological restoration technology aimed at creating sustainable ecosystems conducive to enhancement or restoration of biodiversity [1]. The approach has proved to be remarkably effective in the treatment of polluted rivers, lakes, and reservoirs [2]. The strategy is advantageous in being space efficient compared with the spatial requirements of an artificial wetland [3].…”

Section: Introductionmentioning

confidence: 99%

“…The strategy is advantageous in being space efficient compared with the spatial requirements of an artificial wetland [3]. Artificial floating island systems remove pollutants through absorption by aquatic plant roots, and mitigate nitrogen and phosphorus enrichment in the water by means of microbial degradation [4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Purification efficiency of eight aquatic plant species in an artificial floating island system in relation to extracellular enzyme activity and microbial community

Yan

et al. 2021

Environmental Engineering Research

View full text Add to dashboard Cite

The floating island system exploits the combination of aquatic plants, microorganisms, and extracellular enzymes to purify wastewater. We investigated the purification efficiency of eight aquatic plant species cultured in wastewater. The relationships of plant purification capacity with extracellular enzyme activity and microbial community were analyzed to explore the crucial factors that affect the plant purification capacity and the mechanism of pollutants removal in different plant systems. Three plant species, namely Oenanthe javanica, Thalia dealbata, and lris pseudacorus, were most effective for purification of ammonium-nitrogen (NH4+-N), total phosphate (TP), and chemical oxygen demand (COD) with maximum efficiencies of 76.09, 85.87, and 89.10%, respectively. Urease, alkaline phosphatase (AP), and β-glucosidase activities were significantly and positively correlated with root system development (P < 0.05). Activities of urease and AP were positively correlated with NH4+-N and TP removal, respectively. The magnitude of urease and AP activity was generally consistent with the plant’s capacity to remove NH4+-N and TP. β-Glucosidase activity and COD removal were not significantly correlated. The dominant microbial phylum in each species treatment was Proteobacteria. Alphaproteobacteria and Bacteroidia showed > 1% relative abundance and greater involvement in degradation of pollutants in the experimental system.

show abstract

Study on new artificial floating island removing pollutants

Cited by 18 publications

References 20 publications

Robust Silica–Polyimide Aerogel Blanket for Water-Proof and Flame-Retardant Self-Floating Artificial Island

Robust Silica–Polyimide Aerogel Blanket for Water-Proof and Flame-Retardant Self-Floating Artificial Island

Purification Efficiency of Eight Aquatic Plant Species in an Artificial Floating Island System in Relation to Extracellular Enzyme Activity and Microbial Community

Purification efficiency of eight aquatic plant species in an artificial floating island system in relation to extracellular enzyme activity and microbial community

Contact Info

Product

Resources

About