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  • English  (3)
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  • English  (3)
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  • 1
    Publication Date: 2020-10-22
    Description: New options are needed to reduce the impact of motor vehicles on climate change and declining fossil fuel resources. Cars which are fueled by hydrogen could be a sustainable method of transportation if suitable technologies can be devised to produce hydrogen in an environmentally benign manner along with the provision of the necessary fueling infrastructure. This paper assesses size, space, and cost requirements of bioreactors as a decentralized option to supply hydrogen powered cars with biohydrogen produced from algae or cyanobacteria on a theoretical basis. Decentralized supply of biohydrogen could help to reduce the problems that hydrogen cars face regarding market penetration. A feasibility study for decentralized biohydrogen production is conducted, taking the quantity of hydrogen which is needed to fuel current hydrogen cars into account. While this technology is, in theory, feasible, sizes, and costs of such reactors are currently too high for widespread adoption. Thus, more R&D is needed to close the gap and to approach marketability.
    Keywords: ddc:600
    Repository Name: Wuppertal Institut für Klima, Umwelt, Energie
    Language: English
    Type: article , doc-type:article
    Format: application/pdf
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  • 2
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    In:  Future Cities: Challenges for the Earth Sciences
    Publication Date: 2020-02-12
    Description: Der Vortrag wurde in der Session “Urban Climate/Ecology” gehalten.
    Language: English
    Type: info:eu-repo/semantics/conferenceObject
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  • 3
    Publication Date: 2020-02-12
    Description: The main research activity of this collaborative research effort is the optimization of water treatment technology on basis of granulated Fe hydroxides (= GFH, or in German GEH). GEH® is applied by the SME-Partner, the GEH Wasserchemie GmbH & Co. KG established in 1997 and now one of the leading providers of iron- based high-capacity adsorbents for use in fixed bed filter process. Over 2000 plants have yet been delivered into more than 20 countries worldwide. Main purpose is treatment of As- and Sb-tainted waters, providing e.g. in India more than half million people with treated tap water. GEH® is based on pure synthetic iron hydroxide (Beta-FeOOH, akaganeite) with a large effective surface area (〉250 m2/g) and an adsorption capacity of up to 50 g/kg As if applied on waters containing only As. This enables a simple, low maintenance removal procedure with capacities of up to 300,000 bed volumes over years without producing hazardous As-loaded sludge to be costly deposited. The main practical problem is the yet less well understood efficiency degradation with different groundwater milieus; with more or less reduced bed volume capacity. Our experiments revealed that these effects are mainly due to competing inorganic oxyanion species (e.g., silicate). An open question to be solved for the SME partner was whether a specific biogenic functionalization of the surface may help in optimizing towards a more versatile and smooth filter technology, but our preliminary experiment results were not thus promising towards this task. Instead, we found a severe inhomogeneity in adsorption efficiency and competing effects by inorganic oxyanion species on an individual grain scale which may become unexpected and new key information how to improve on the GEH production process.
    Language: English
    Type: info:eu-repo/semantics/conferenceObject
    Format: application/pdf
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