02 Fakultät Bau- und Umweltingenieurwissenschaften

Permanent URI for this collectionhttps://elib.uni-stuttgart.de/handle/11682/3

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    Optimal design of experiments to improve the characterisation of atrazine degradation pathways in soil
    (2021) Chavez Rodriguez, Luciana; González‐Nicolás, Ana; Ingalls, Brian; Streck, Thilo; Nowak, Wolfgang; Xiao, Sinan; Pagel, Holger
    Contamination of soils with pesticides and their metabolites is a global environmental threat. Deciphering the complex process chains involved in pesticide degradation is a prerequisite for finding effective solution strategies. This study applies prospective optimal design (OD) of experiments to identify laboratory sampling strategies that allow model‐based discrimination of atrazine (AT) degradation pathways. We simulated virtual AT degradation experiments with a first‐order model that reflects a simple reaction chain of complete AT degradation. We added a set of Monod‐based model variants that consider more complex AT degradation pathways. Then, we applied an extended constraint‐based parameter search algorithm that produces Monte‐Carlo ensembles of realistic model outputs, in line with published experimental data. Differences between‐model ensembles were quantified with Bayesian model analysis using an energy distance metric. AT degradation pathways following first‐order reaction chains could be clearly distinguished from those predicted with Monod‐based models. As expected, including measurements of specific bacterial guilds improved model discrimination further. However, experimental designs considering measurements of AT metabolites were most informative, highlighting that environmental fate studies should prioritise measuring metabolites for elucidating active AT degradation pathways in soils. Our results suggest that applying model‐based prospective OD will maximise knowledge gains on soil systems from laboratory and field experiments.
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    Sustainability assessment of fuel cell buses in public transport
    (2018) Lozanovski, Aleksandar; Whitehouse, Nicole; Ko, Nathanael; Whitehouse, Simon
    Hydrogen fuel cell (H2FC) buses operating in every day public transport services around Europe are assessed for their sustainability against environmental, economic and social criteria. As part of this assessment the buses are evaluated against diesel buses both in terms of sustainability and in terms of meeting real world requirements with respect to operational performance. The study concludes that H2FC buses meet operability and performance criteria and are sustainable environmentally when ‘green’ hydrogen is used. The economic sustainability of the buses, in terms of affordability, achieves parity with their fossil fuel equivalent by 2030 when the indirect costs to human health and climate change are included. Societal acceptance by those who worked with and used the buses supports the positive findings of earlier studies, although satisfactory operability and performance are shown to be essential to positive attitudes. Influential policy makers expressed positive sentiments only if ‘green’ hydrogen is used and the affordability issues can be addressed. No “show-stopper” is identified that would prevent future generations from using H2FC buses in public transport on a broad scale due to damage to the environment or to other factors that impinge on quality of life.
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    Statistical analysis of climate trends and impacts on groundwater sustainability in the Lower Indus Basin
    (2024) Ahmed, Waqas; Ahmed, Suhail; Punthakey, Jehangir F.; Dars, Ghulam Hussain; Ejaz, Muhammad Shafqat; Qureshi, Abdul Latif; Mitchell, Michael
    Agricultural intensification is increasing global demand for water, with groundwater especially susceptible given its year-round reliability. Climate change impacts on groundwater recharge exacerbate uncertainties for future access and use, especially for large aquifers across alluvial plains such as the Indus Basin of Pakistan. To generate better understanding of climate change impacts on groundwater balances in such contexts, we used MODFLOW 2005 to quantify the groundwater budget of the Northern Rohri Canal Command Area under RCP 4.5 and 8.5 climatic scenarios, while also taking climatic regionalisation into account. Under a baseline scenario, total annual pumping in the northern Rohri command was estimated to be 3.619 billion cubic metres (BCM), and the total net loss in storage over the simulation period from October 2010 to April 2014 was estimated at 1.244 BCM per year. By 2047, net decline in storage is projected to more than double to 2.185 per year under RCP 4.5 scenario and 2.214 under RCP 8.5. Our estimates suggest that a sustainable yield across the command area should be managed at approximately 3 ± 0.3 BCM per year to ensure sufficient adaptive reserves of groundwater for access during times of drought and inadequate surface supply, while also reducing waterlogging impacts from high watertables. This first-time estimate of sustainable yield provides irrigation system managers with an overall guide from which divisional-scale measures to achieve the goal can be identified through stakeholder engagement.
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    Sichere Trinkwasserversorgung trotz Klimawandel - wie resilient sind unsere Systeme und wo besteht Handlungsbedarf? : 32. Trinkwasserkolloquium, 20.02.2020
    (Stuttgart : Institut für Siedlungswasserbau, Wassergüte- und Abfallwirtschaft der Universität Stuttgart ISWA, 2020) Langner, Markus; Gudera, Thomas; Jeromin, Christoph; Haakh, Frieder; Ott, Franz; Witte, Ralf; Haakh, Frieder; Jeromin, Christoph; Schönberger, Harald
    Das Trockenjahr 2018 war ein Vorbote dessen, was selbst bei Einhaltung des 2°-Ziels der globalen Erwärmung zukünftig als Normaljahr zu erwarten ist. Wie kann auch in Zukunft eine sichere Wasserversorgung in Baden-Württemberg gewährleistet werden?
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    Chemikalienmanagement und Umweltschutz in der textilen Kette
    (München : DIV Deutscher Industrieverlag GmbH, 2017) Krist, Helmut; Schäfer, Thomas; Marzinkowski, Joachim M.; Schönberger, Harald; Bayer, Andreas; Förster, Johannes; Schmid, Matthias; Kohla, Monika; Seidel, Stefan D.; Minke, Ralf; Schönberger, Harald
    Die Bekleidung als Grundbedürfnis des Menschen wird heute global in sehr komplexen Lieferketten hergestellt. Nach der Ernährung, dem privaten Transport und dem Wohnen hat die Textilproduktion den höchsten Umwelt-Fußabdruck. Dazu tragen vor allem die Baumwollproduktion, die Herstellung von Farbstoffen und optischen Aufhellern, die Textilveredlung (das Vorbehandeln, Färben, Drucken und Ausrüsten) sowie die Gebrauchsphase der Textilien mit ihren vielen Wasch- und Trocknungsvorgängen bei. Von besonderer Bedeutung ist der hohe Chemikalieneinsatz, der bis zu 1 kg chemischer Produkte je Kilogramm Textil betragen kann. Angesichts tausender vermarkteter chemischer Produkte ist es schwierig, einen Überblick zu erhalten über all die chemischen Stoffe, die vor allem mit dem Abwasser aus der Textilveredlung und -pflege emittiert werden. Nur auf Basis von Fakten und der medienübergreifenden integrierten Betrachtung der textilen Kette lassen sich Konzepte und konkrete Maßnahmen definieren, die zur nachhaltigen Verminderung des Umwelt-Fußabdruckes der Textilproduktion beitragen. Deshalb wird hier aus technisch-naturwissenschaftlicher Sicht das Chemikalien- und Umweltmanagement der gesamten textilen Kette beleuchtet. Dieses umfasst die Erstellung von Positivlisten für Chemikalien sowie die Berücksichtigung von REACh und neuen Erkenntnissen bezüglich Schadstoffen, schadstoffanalytische Aspekte, die umweltfreundlichere Herstellung von Farbstoffen, optischen Aufhellern und Textilhilfsmitteln, prozessintegrierte Maßnahmen bei der Textilveredlung, den Umgang und die Lagerung chemischer Stoffe sowie die Behandlung und das Recycling von Textilabwasser einschließlich eines neuen globalen Abwasserstandards.
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    Design for and from disassembly with timber elements : strategies based on two case studies from Switzerland
    (2023) Grüter, Cäsar; Gordon, Matthew; Muster, Marcel; Kastner, Fabian; Grönquist, Philippe; Frangi, Andrea; Langenberg, Silke; Wolf, Catherine de
    When a timber building gets disassembled and its elements either are burned or biodegrade, the carbon stored in the timber structure gets released to the atmosphere as CO2. Reusing timber elements prevents this process from happening and thus delays the global warming caused by greenhouse gas emissions. Even if there is a long historic tradition of timber reuse in Switzerland, currently a low fraction of a timber building’s elements is being reused after its disassembly. In this study, strategies that could facilitate circular use of timber elements are analyzed. The focus lies on the design process, which is investigated from two perspectives: strategies at the start-of-life of buildings to enable new timber element cycles to emerge (design for disassembly, or DforD), and strategies at the end-of-life of buildings to keep existing timber elements cycles closed (design from disassembly, or DfromD). Two case studies of recently completed multi-story timber-hybrid buildings in Switzerland were analyzed from both perspectives. Regarding DforD, a scoring system was developed that assesses single elements according to their disassembly and reuse potential. Regarding DfromD, a building design optimization tool was created that takes dimensional design tolerances of a building as an input and proposes a procurement-optimized and structurally safe arrangement of reused elements, which are taken from an inventory that is based on the two case studies. It was found that connections between reinforced concrete and timber parts play a crucial role in terms of DforD and that building layouts with DfromD elements may vary widely according to the chosen optimization variable. In conclusion, both applications have the potential to scale up the competitiveness of reused elements.
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    Advanced methods to investigate hydro‐morphological processes in open‐water environments
    (2021) Haun, Stefan; Dietrich, Stephan
    Hydro‐morphology describes the interactions between water and sediments in fluvial systems and the corresponding processes across all spatial and temporal scales. The results are natural and anthropogenically influenced bed structures and fluvial landforms. However, many of these hydro‐morphological processes cannot be described analytically yet, as a result of their stochastic behaviour and the multitude of processes involved across spatial and temporal scales. Deeper knowledge of these processes is essential, not only for understanding the system itself, but also for practical applications, which rely on correct and reliable investigations of these processes. During the European Geoscience Union (EGU) General Assembly (GA) 2018 in Vienna, Austria, the conveners of the session on “Measurements, monitoring and numerical modelling of sedimentary and hydro‐morphological processes in open‐water environments” had the idea of initiating a special issue, containing a collection of recent achievements in this research field. The aim of this extended introduction is twofold. First, an overview on research needs in investigating hydro‐morphological processes in open‐water environments is given in this article. Second, recently published studies that aim to improve the understanding of hydro‐morphological processes in rivers, lakes and reservoirs by innovative measurement approaches are discussed. In addition to submitted papers collected from the EGU GA in 2017, 2018 and 2019, related studies published in Earth Surface Processes and Landforms (ESPL) over the last two years are also incorporated into this special issue. The papers selected cover a wide range of studies with differing spatial and temporal resolutions. This broad spectrum of different scales clearly indicates the challenges associated with the development and use of advanced methods for investigating hydro‐morphological processes in open‐water environments.
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    Risiken in der Wasserversorgung : Vorsorge, Management, Minimierung, Kommunikation
    (München : DIV Deutscher Industrieverlag GmbH, 2017) Haile, Christian; Anders, Thomas; Sturm, Sebastian; Harms, Egon; Lorenz, Janine; Kiefer, Joachim; Fischer, Thilo; Niehues, Berthold; Marquardt, Uwe; Schick, Roland; Schönberger, Harald; Minke, Ralf
    Die Planung und der Betrieb von Wasserversorgungsanlagen sowie die Organisation der zugehörigen Unternehmen birgt seit jeher ein gewisses Maß an Risiken. So können sich im Laufe der Betriebszeit Planungs- und Betriebsgrundlagen wie das Wasserdargebot oder der Wasserbedarf infolge Änderungen des Klimas, der Demografie, der Bevölkerungszahlen und Wirtschaftsstruktur sowie Änderungen des Verbrauchsverhaltens stark ändern. Im Bereich der Wassergewinnung können Risiken dadurch entstehen, dass Verunreinigungen ins Rohwasser gelangen, die die Trinkwasserqualität beeinträchtigen und den Aufbereitungsaufwand deutlich erhöhen. Schließlich können wirtschaftliche und betriebliche Risiken dadurch entstehen, dass z.B. übergeordnete internationale Gesetzgebungen und Normungsänderungen Auswirkungen bis hin zur Ebene der einzelnen Wasserversorgungsunternehmen haben. Und schließlich nimmt aufgrund der zunehmenden Digitalisierung der Wasserversorgung das Risiko unbefugter Eingriffe in die IT-Infrastrukturen der Wasserversorgung zu.
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    Biological waste air and waste gas treatment : overview, challenges, operational efficiency, and current trends
    (2020) Dobslaw, Daniel; Ortlinghaus, Oliver
    International contracts to restrict emissions of climate-relevant gases, and thus global warming, also require a critical reconsideration of technologies for treating municipal, commercial, industrial, and agricultural waste gas emissions. A change from energy- and resource-intensive technologies, such as thermal post-combustion and adsorption, as well to low-emission technologies with high energy and resource efficiency, becomes mandatory. Biological processes already meet these requirements, but show restrictions in case of treatment of complex volatile organic compound (VOC) mixtures and space demand. Innovative approaches combining advanced oxidation and biofiltration processes seem to be a solution. In this review, biological processes, both as stand-alone technology and in combination with advanced oxidation processes, were critically evaluated in regard to technical, economical, and climate policy aspects, as well as present limitations and corresponding solutions to overcome these restrictions.
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    Adsorption of metals to particles in urban stormwater runoff : does size really matter?
    (2021) Baum, Philipp; Kuch, Bertram; Dittmer, Ulrich
    The parameter total suspended solids (TSS) is often used to evaluate the need for stormwater treatment or to assess the effectiveness of treatment measures. The purpose of this study is to analyze the value and the limitations of this approach using metals as an example. They are of major concern due to their accumulating effects in the environment. Data of a monitoring campaign at a stormwater treatment facility is evaluated. TSS, organic matter and the associated metals (Cr, Cu, Zn, Cd, and Pb) were analyzed in four different particle size fractions (<63 µm, 63-125 µm, 125-250 µm, and 250-2000 µm). While the highest event meant concentrations for all metals were found in the smallest fraction, a rather uniform particulate bound metal concentration (mass of metal per mass of particulate matter) over the first three particle size fractions was detected. Total metal loads correlated well with TSS even better with TSS < 63 µm. However, the removal efficiency in terms of the reduction of the total metal load was not reflected sufficiently by the TSS or TSS < 63 µm removal efficiency.