Browsing by Author "Lorenz, Manuel"

Now showing 1 - 5 of 5

Open Access
Combining membrane and zero brine technologies in waste acid treatment for a circular economy in the hot-dip galvanizing industry : a life cycle perspective
(2023) Lorenz, Manuel; Seitfudem, Georg; Randazzo, Serena; Gueccia, Rosa; Gehring, Florian; Prenzel, Tobias M.
An innovative approach of combining membrane and zero brine technologies for a joint treatment of industrial liquid waste is investigated regarding its environmental impacts compared to the existing liquid waste treatment. The object of investigation is the generation of waste acid solution by a hot dip galvanizing plant in Sicily, Italy. The waste acid solution contains hydrochloric acid, iron and zinc, which makes it a hazardous waste according to EU classifications. Environmental impacts are studied for two scenarios in the Tecnozinco hot-dip galvanizing plant in Sicily, Italy: (i) the current process of pickling with linear disposal of waste acid and (ii) the pickling combined with in-situ treatment of the waste acid using a combination of diffusion dialysis (DD), membrane distillation (MD) and a precipitation reactor. Results are obtained via an attributional life cycle assessment (LCA) approach focusing on the water footprint profile of the process. The linear disposal path creates significant costs, environmental burdens and risks during the 1500 km transport of hazardous liquid waste. The combination of DD and MD, complemented with a zero-brine precipitation reactor, closes internal material loops, could save local water resources and reduces costs as well as environmental impacts. Reduction potentials of 70-80% regarding most LCA impact categories can be expected for the application of the novel technology combination supporting the galvanizing pre-treatment process under study. Therefore, the application of such technology on the way forward to a more circular economy is recommended from an environmental viewpoint, especially in process plants similar to the investigated one.
Open Access
Environmental impacts of renewable insulation materials
(2021) Geß, Andreas; Lorenz, Manuel; Tolsdorf, Anna; Albrecht, Stefan
According to the IEA Global Status Report for Buildings and Construction 2019, one of the main industry sectors causing environmental impacts is the construction sector. Hence, construction materials from renewable resources are expected to have a large potential to decrease these impacts. In this study, a Life Cycle Assessment (LCA) was conducted for four different insulation materials from renewable feedstock: insulation made from pasture grass, seaweed, reed, and recycled jute fibres. Additionally, the effects on land use change were evaluated for pasture grass insulation using the LANCA® methodology. To put the LCA results in relation to those of non-renewable resources, a comparison of standardized LCA values for conventional insulation materials is presented. In general, the renewable insulation materials show fewer environmental impacts than their conventional counterparts. In particular, these materials have advantages regarding greenhouse gas emissions and their impact on climate change. Of the analyzed materials, seaweed showed the overall lowest emissions. It can be concluded that insulation materials from non-mineral, non-fossil, and non-wooden resources are still fairly niche in terms of market share, but they have extraordinary potential in decreasing the environmental impacts of construction ventures.
Open Access
Eine Methodik zur Migration von Microsoft-Access-Anwendungen
(2016) Lorenz, Manuel
Migrationen und insbesondere Datenmigrationen stellen ein erhebliches Aufgabe dar. Durch geeignete Methodiken lassen sich diese Aufgaben systematisch angehen. Wiederkehrende Erkenntnisse bei der Migration können in diese Methodiken festgehalten werden und verhindern so die Wiederholung der gleichen Problem. Für viele Migrationen existieren bereits ausgereifte Methodiken. Für eine Migration vom Microsoft Access Anwendungen fehlt eine solche Methodik. Mit dieser Bachelorarbeit soll der Grundstein für eine solche Methodik erstellt werden. Dazu wird eine Migration einer Microsoft Access Anwendung exemplarisch durchgeführt und dabei die besonderen Merkmale einer solchen Migration festgehalten. Diese Merkmale können dann genutzt werden um eine geeignete Methodik zur Migration vom Microsoft-Access-Anwendungen zu erstellen.
Open Access
Performance-Analyse zweier Toolkits für interaktive projizierte Displays
(2014) Türk, Dieter Daniel; Yildiz, Merve; Lorenz, Manuel
Mit der Microsoft Kinect wurden Tiefenkameras zu günstigen Preisen für die Allgemeinheit verfügbar. Kombiniert man eine Kinect mit einem Beamer, kann man interaktive projizierte Displays bauen. Das Beste daran ist, dass man dafür keine fest installierten Displays braucht. So können Displays aus jeder beliebigen Oberfläche, egal welcher Form und Struktur, einen Multitouch-Display erzeugen. Zurzeit werden Toolkits entwickelt, die eine bequeme Möglichkeit bieten, interaktive Inhalte für diese Displays bereitzustellen. Aus diesem Grund werden in dieser Fachstudie zwei solche Toolkits untersucht und miteinander verglichen. In einer Nutzerstudie werden mittels eines Fitts' Law Tasks grundlegende Performanz Indikatoren erfasst und ausgewertet. Bei der Auswertung wird nicht nur die Performanz der Toolkits gegenübergestellt, sondern die Ergebnisse werden auch mit der subjektiven Beurteilung der Studienteilnehmer verglichen. Ziel der Fachstudie ist es, jeweils die Vor- und Nachteile beider Toolkits darzustellen.
Open Access
Recycled or reusable : a multi‐method assessment of eco‐friendly packaging in online retail
(2023) Frommeyer, Britta; Koch, Julia; Scagnetti, Carla; Lorenz, Manuel; Schewe, Gerhard
The rapid growth of online retail increases the demand for packaging. Although packaging is necessary to fulfill logistic and marketing functions, it fosters the depletion of resources, is often used carelessly, and thus negatively impacts the environment. Eco‐friendly packaging variants could provide a solution to this problem. Since many stakeholders must be involved to promote their use, this study develops a conceptual framework that reconciles their different perspectives and combines these with an environmental assessment to facilitate the transition to more sustainable online retail. We apply a multi‐method research approach to investigate the different views. We use qualitative interviews and website analyses to capture the perspective of online retailers, conduct an online survey (n = 1491) to investigate consumers’ perceptions of various product and transport packaging alternatives, and perform a life cycle assessment (LCA) of these options. The findings reveal that online retailers lack knowledge regarding consumer preferences and the environmental impact of packaging. The consumer survey shows a strong preference for packaging made from recycled paper and general avoidance of plastic packaging. The LCA results reveal that recycled and reusable variants are environmentally beneficial. The findings are interpreted in light of the relationships assumed in the conceptual framework. From a theoretical perspective, our results indicate that online retailers are concerned about the signaling role of packaging and that consumers refer to heuristic cues when deciding between packaging variants. We reconcile the different perspectives to propose strategies that contribute to a broader distribution of eco‐friendly packaging in online retail.