Abbau von Bacterium coli durch h�here Wasserpflanzen

Seidel, Käthe

doi:10.1007/bf00637265

Cited by 31 publications

(6 citation statements)

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“…It is known that aryl and sulfonyl azides can also be photochemically activated, but we focused our investigations here exclusively on the thermal process. 26,[38][39][40] The decomposition and binding mechanism of sulfonyl azides is well described. 31,33,41 Briefly, upon heating the sulfonyl azide groups loose nitrogen and form a nitrene.…”

Section: Resultsmentioning

confidence: 99%

Surface Attached Polymer Networks through Thermally Induced Cross-Linking of Sulfonyl Azide Group Containing Polymers

2008

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We report on a simple and versatile way for the modification of surfaces with thin polymer films through the thermally induced generation of surface-attached polymer networks. The system is based on copolymers, which contain a thermally reactive sulfonyl azide derivative that has been incorporated into the polymer chain during a radical copolymerization reaction. The copolymers are spin-coated from solution onto a silicon-wafer, which had been previously modified with an organosilane. Upon heating the sulfonyl azide decomposes, leading to a C-H insertion reaction and, at sufficiently high conversion, network formation. As groups in the forming network also attack the molecules of the surface-attached monolayer, the forming network becomes directly attached to the substrate surface. Following this method thin layers of polymer networks from a variety of polymers with different properties can be attached to the substrate. Furthermore, the process can be used for the generation of microstructures of polymers in hot-embossing processes. Here, cross-linking occurs during the embossing process and dimensionally stable microstructures are formed.

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Section: Resultsmentioning

confidence: 99%

Surface Attached Polymer Networks through Thermally Induced Cross-Linking of Sulfonyl Azide Group Containing Polymers

2008

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“…Provision of surface for microbial attachment [2,7] Root release of gas and exudates Oxygen leakage-addition of aerobic niches [1,7,15,16] Oxygen leakage-increased aerobic degradation [17,18] Oxygen leakage-supports precipitation of heavy metals [7] Oxygen leakage-increased nitrification Excretion of carbon-increased denitrification [2,11,[19][20][21] Aerobic dynamics are very limited in horizontal flow CWs (HF) [7] Release of antibiotics, phytometallophores and phytochelatins [7,[22][23][24] Root exudates promote metal chelation to prevent metal toxicity [7] Plant uptake…”

Section: Role Of Plants In Cwsmentioning

confidence: 99%

Role of Plants in a Constructed Wetland: Current and New Perspectives

Shelef

Gross

Rachmilevitch

2013

Water

178

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Abstract:The role of plants in the treatment of effluents by constructed wetland (CW) systems is under debate. Here, we review ways in which plants can affect CW processes and suggest two novel functions for plants in CWs. The first is salt phytoremediation by halophytes. We have strong evidence that halophytic plants can reduce wastewater salinity by accumulating salts in their tissues. Our studies have shown that Bassia indica, a halophytic annual, is capable of salt phytoremediation, accumulating sodium to up to 10% of its dry weight. The second novel use of plants in CWs is as phytoindicators of water quality. We demonstrate that accumulation of H 2 O 2 , a marker for plant stress, is reduced in the in successive treatment stages, where water quality is improved. It is recommended that monitoring and management of CWs consider the potential of plants as phytoremediators and phytoindicators.

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“…by passage through a vegetation of bulrushes (Seidel, 1964;Seidel, 1966). Experiments were also conducted with degradation of heavy metals and hydrocarbons (phenol and its derivatives) which showed that bulrushes and other higher plants were able to eliminate those from water (Seidel. 1966).…”

Section: Extract From An Essay Written By Nemo To the Head Of The Hormentioning

confidence: 99%

Use of constructed wetlands in water pollution control: historical development, present status, and future perspectives

Brix

1994

Water Science and Technology

255

122

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During the last two decades the multiple functions and values of wetlands have been recognized not only by the scientists and managers working with wetlands, but also by the public. The ability of wetlands to transform and store organic matter has been exploited in constructed wetlands. This paper summarizes the state-of-the-art of the uses of constructed wetlands in water pollution control by reviewing the basics of the technology, the historical development, and the performance expectations with focus on the use of free water surface and subsurface flow constructed wetlands for municipal wastewater treatment. Performance data from a total of 104 subsurface flow systems and 70 free water surface flow systems are reviewed. The present state of knowledge is sufficient to apply constructed wetlands as a tool for improving water quality. The potential applications range from secondary treatment of municipal and various types of industrial wastewaters to polishing of tertiary treated waters and diffuse pollution. In many situations constructed wetlands is the only appropriate technology available. The treatment capacity of subsurface flow systems can be improved by selecting vertical flow systems with intermittent loading, by proper media selection, and by recycling of the wastewater. Further research is needed to help define and optimize engineering design criteria and the long-term performance capabilities and operational problems.

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Abbau von Bacterium coli durch h�here Wasserpflanzen

Cited by 31 publications

References 0 publications

Surface Attached Polymer Networks through Thermally Induced Cross-Linking of Sulfonyl Azide Group Containing Polymers

Surface Attached Polymer Networks through Thermally Induced Cross-Linking of Sulfonyl Azide Group Containing Polymers

Role of Plants in a Constructed Wetland: Current and New Perspectives

Use of constructed wetlands in water pollution control: historical development, present status, and future perspectives

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