Hugi, Christoph

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Christoph
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Hugi, Christoph

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2015 - 2019162020 - 20233
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  • Vorschaubild nicht verfügbar
    Publikation
    Geostrategic Supply Risk and Economic Importance as Drivers for Implementation of Industrial Ecology Measures in a Nitrogen Fertilizer Production Company
    (Wiley, 03/2017) Hugi, Christoph; Malinauskiene, Milda; Kliopova, Irina; Staniskis, Jurgis Kazimieras [in: Journal of Industrial Ecology]
    Among other concerns, safeguarding the supply chains of raw materials is an important task for industrial companies. Therefore, not surprisingly, the number of scientific publications concerning the evaluation of resource criticality has increased in recent years. However, it was noticed that currently published methodologies are too complex to be applied by industrial companies on a daily basis. For this reason, the need to develop a methodology that would allow not only assessing resource criticality, but could also be integrated into widely applied methodological frameworks as an additional driver to improve resource efficiency was identified. Geostrategic supply risk and economic importance were chosen as key indicators to analyze and assess relative resource criticality. The developed methodology was field tested by applying it to a resource-intensive nitrogen fertilizer production company. Five scenarios for resource efficiency improvements, consisting of cleaner production and industrial symbiosis measures, were investigated. If all the proposed measures were implemented, consumption of natural gas would decrease by 3.552 million cubic meters per year (0.3% of the total consumption). However, not all identified measures contribute to a reduction of the overall criticality of resources for the production company. Nevertheless, the integration of criticality assessments into the widely applied methodologies for development and implementation of resource efficiency innovations is a valuable addition and should be included in the analysis for sustainable innovations and development.
    01A - Beitrag in wissenschaftlicher Zeitschrift
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    Publikation
    Environmental potential analysis of co-processing waste in cement kilns
    (Kharkiv State Academy of Physical Culture, 2019) Kleshchov, Anton; Hengevoss, Dirk; Hugi, Christoph [in: Eastern-European Journal of Enterprise Technologies]
    01A - Beitrag in wissenschaftlicher Zeitschrift
  • Vorschaubild nicht verfügbar
    Publikation
    Selective CRM recovery from acidic solutions by nanofiltration/liquid-liquid extraction
    (05/2017) Hengevoss, Dirk; Hugi, Christoph; Wintgens, Thomas; Lenz, Markus; Schäfer, Roman
    06 - Präsentation
  • Vorschaubild nicht verfügbar
    Publikation
    Poseidon—Decision Support Tool for Water Reuse
    (Elsevier, 2019) Oertlé, Emmanuel; Hugi, Christoph; Wintgens, Thomas [in: Water]
    01A - Beitrag in wissenschaftlicher Zeitschrift
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    Publikation
    Innovative technology of biscuit production based on the use of secondary products of soybean processing
    (Oles Honchar Dnipro National University, 25.04.2023) Korkach, Hanna V.; Kotuzaki, Olena M.; Breitenmoser, Lena; Behner, David; Hugi, Christoph; Krusir, Galina V. [in: Journal of Chemistry and Technologies]
    01A - Beitrag in wissenschaftlicher Zeitschrift
  • Vorschaubild nicht verfügbar
    Publikation
    Estimation of biogas potential in Indian communities using a Geographic Information System combined with Material Flow Analysis
    (2017) Gross, Thomas; Breitenmoser, Lena; Dhar, Hiya; Kumar, Sunil; Hugi, Christoph; Wintgens, Thomas
    06 - Präsentation
  • Vorschaubild nicht verfügbar
    Publikation
    Potential of biogas production to reduce firewood consumption in remote high-elevation Himalayan communities in Nepal
    (EDP Sciences, 25.08.2017) Gross, Thomas; Zahnd, Alex; Adhikari, Suman; Kaphre, Abhishek; Sharma, Subodh; Baral, Bivek; Kumar, Sunil; Hugi, Christoph [in: Renew. Energy Environ. Sustain]
    Remote communities in the Nepalese mountains above 2500 m a.s.l. belong to the most precarious in the world. Inhabitants struggle for the minimum in terms of safe drinking water, food and sanitation. Reliable, affordable and clean energy for cooking, room heating and warm water for personal hygiene is often lacking and dependency on firewood very high. The remoteness and unlikeliness of electric grid connection in the coming decades make a diversified energy supply from renewable local resources crucial. Small-scale anaerobic digestion (AD) of organic substrates has been used for long in rural areas of developing countries to produce biogas as energy source and recover residue as organic fertilizer. AD is challenging at high elevations due to year around lower ambient temperatures and lower annual biomass production per area compared to lowlands. Nevertheless, examples of operational household AD exist even above 3000 m a.s.l. in the Andes. Here we compare firewood consumption with biogas potential from organic substrates in a community with 39 households at 3150 m a.s.l. in Jumla District, Nepal. In five households with varying numbers of members and animals kept, mean firewood use and its energy content per capita (cap) and day (d) were 2.1 kg or ca. 25 MJ in spring and 2.3 kg or ca. 28 MJ in winter. Easily available substrates include cow, sheep and horse dung from overnight shelters and human excrements from pit latrines, amounting on average to 1.7 kg wet weight (kgww) cap−1 d−1 in spring and 2.2 kgww cap−1 d−1 in winter. Adjusted to normal conditions (Nm3 at 0 °C, 1013.15 hPa), these substrates yielded on average 0.08 Nm3 cap−1 d−1 biogas in spring and 0.12 Nm3 cap−1 d−1 in winter (35–60% methane content) in biochemical methane potential (BMPs) tests at 36 °C. This could provide up to 60% of basic cooking needs on average and up to 75% in a “typical” household in terms of members and animals kept. Of the overall thermal energy needs including also room heating ca. 10–20% could be covered, substituting 0.1–0.4 (mean: 0.2) kg firewood cap−1 d−1. If only animal dung and human excrements are considered, no competition for resources arises as residues can still be used as organic fertilizer. This study supports the design and introduction of planned pilot digesters integrated into on-going community development including pit latrines for substrate availability, greenhouses as possible way of thermal insulation, and planned pico-hydropower plants to use excess electricity during the night for digester heating.
    01A - Beitrag in wissenschaftlicher Zeitschrift
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    Publikation
    Re-using bauxite residues: benefits beyond (critical raw) material recovery
    (Wiley, 2018) Ujaczki, Eva; Feigl, Victoria; Molnar, Monika; Cusack, Patricia; Curtin, Teresa; Courtney, Ronan; Ronan, Lisa; Davris, Panagiotis; Hugi, Christoph; Evangelou, Michael; Balomenos, Efthymios; Lenz, Markus [in: Journal of Chemical Technology & Biotechnology]
    Since the world economy has been confronted with an increasing risk of supply shortages of critical raw materials (CRMs), there has been a major interest in identifying alternative secondary sources of CRMs. Bauxite residues from alumina production are available at a multi-million tonnes scale worldwide. So far, attempts have been made to find alternative re-use applications for bauxite residues, for instance in cement / pig iron production. However, bauxite residues also constitute an untapped secondary source of CRMs. Depending on their geological origin and processing protocol, bauxite residues can contain considerable amounts of valuable elements. The obvious primary consideration for CRM recovery from such residues is the economic value of the materials contained. However, there are further benefits from re-use of bauxite residues in general, and from CRM recovery in particular. These go beyond monetary values (e.g. reduced investment / operational costs resulting from savings in disposal). For instance, benefits for the environment and health can be achieved by abatement of tailing storage as well as by reduction of emissions from conventional primary mining. Whereas certain tools (e.g. life-cycle analysis) can be used to quantify the latter, other benefits (in particular sustained social and technological development) are harder to quantify. This review evaluates strategies of bauxite residue re-use / recycling and identifies associated benefits beyond elemental recovery. Furthermore, methodologies to translate risks and benefits into quantifiable data are discussed. Ultimately, such quantitative data are a prerequisite for facilitating decision-making regarding bauxite residue re-use / recycling and a stepping stone towards developing a zero-waste alumina production process.
    01A - Beitrag in wissenschaftlicher Zeitschrift
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    Publikation
    Anaerobic digestion of biowaste in Indian municipalities. Effects on energy, fertilizers, water and the local environment
    (Elsevier, 07/2021) Gross, Thomas; Breitenmoser, Lena; Hugi, Christoph; Wintgens, Thomas [in: Resources, Conservation and Recycling]
    Anaerobic digestion (AD) of biowaste seems promising to provide renewable energy (biogas) and organic fertilizers (digestate) and mitigate environmental pollution in India. Intersectoral analyses of biowaste management in municipalities are needed to reveal benefits and trade-offs of AD at the implementation-level. Therefore, we applied material flow analyses (MFAs) to quantify effects of potential AD treatment of biowaste on energy and fertilizer supply, water consumption and environmental pollution in two villages, two towns and two cities in Maharashtra. Results show that in villages AD of available manure and crop residues can cover over half of the energy consumption for cooking (EC) and reduce firewood dependency. In towns and cities, AD of municipal biowaste is more relevant for organic fertilizer supply and pollution control because digestate can provide up to several times the nutrient requirements for crop production, but can harm ecosystems when discharged to the environment. Hence, in addition to energy from municipal biowaste - which can supply 4-6% of EC - digestate valorisation seems vital but requires appropriate post-treatment, quality control and trust building with farmers. To minimize trade-offs, water-saving options should be considered because 2-20% of current groundwater abstraction in municipalities is required to treat all available biowaste with 'wet' AD systems compared to <3% with 'dry' AD systems. We conclude that biowaste management with AD requires contextualized solutions in the setting of energy, fertilizers and water at the implementation-level to conceive valorization strategies for all AD products, reduce environmental pollution and minimize trade-offs with water resources.
    01A - Beitrag in wissenschaftlicher Zeitschrift
  • Vorschaubild nicht verfügbar
    Publikation
    Modular Pico-hydropower System for Remote Himalayan Villages
    (Springer, 01/2018) Zahnd, Alex; Stambaugh, Mark; Jackson, Derek; Gross, Thomas; Hugi, Christoph; Sturdivant, Rick; Yeh, James; Sharma, Subodh; Sajigh, Ali [in: Transition Towards 100% Renewable Energy]
    Remote, high-altitude villages in the Nepalese Himalayas belong to the poorest and most underdeveloped communities in Nepal, with many still years/decades away from access to electricity. It is common that first-time electrification of these villages is through a 15–50 kW micro-hydropower (MHP) system, subsidized by the Nepal government. The majority of the so far installed MHP systems in the region are however within 3–12 months after they have been commissioned either inoperable due to premature equipment breakage, inappropriate operation, and absent maintenance or do not provide the expected power output. No mechanism is put in place to build an operating and maintenance fund, further putting the longevity of the system at risk. The “dreams” of villagers, promised by such development projects, remain unfulfilled and most often shattered. This paper describes a modular pico-hydropower (PHP) system (1–5 kW) being pursued in the village of Moharigaun in the Jumla district of Nepal whose capacity can be expanded as the village’s power demand, population, and ability to operate and maintain the system grow. This modular PHP system provides reliability through redundancy and the elimination of some of the more maintenance-prone components. The turbine water and electricity delivery infrastructure are buried to protect them from the elements and potential mischief. Most importantly, a prepayment system with remote disconnect capability ensures households pay into an operations and maintenance fund. The whole village community is actively involved in each step of the project (planning, implementation stages, and training), so they will develop a strong ownership for their PHP system. Further, local people, chosen by the community, will be trained to properly operate, administer, and maintain the PHP system.
    04 - Beitrag Sammelband oder Konferenzschrift