Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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    ThinkForest: Science insights to the European Green Deal and forests
    Palahí, M. ; Potočnik, J. ; Nabuurs, G.J. ; Bauhus, J. ; Hetemäki, Lauri - \ 2020
    Wageningen University & Research
    biobased economy - renewable energy - forestry - wood - climate - Europe
    Our May ThinkForest webinar focused on:
    - What are the main objectives of the Green Deal and how do these relate to the forest-based sector?
    - How is the forest-based sector in general viewed in the Green Deal?
    - What are the strengths and weaknesses of the Green Deal proposal from ecological, economic and social sustainability perspectives?

    Speakers included:
    Marc Palahí, European Forest Institute (5:34)
    Janez Potočnik, ThinkForest president (12:52)
    Gert-Jan Nabuurs, Wageningen University, IPCC Lead Author (24:47)
    Jürgen Bauhus, University of Freiburg (45:30)
    Lauri Hetemäki, European Forest Institute (1:05:18)
    ‘Vergroening chemische industrie vereist radicale keuzes’: hernieuwbare grondstoffen, maar ook nieuwe processen
    Sanders, J.P.M. - \ 2019
    biobased economy - chemical industry - netherlands - innovation adoption - renewable energy - biomass
    Dossier Circulaire & Biobased Economy
    Wubben, E.F.M. - \ 2019
    Groen Kennisnet
    biobased economy - bioenergy - biomass - renewable energy - biobased materials - biobased chemistry - clothing - bioplastics - fibres
    The dossier Circular & Biobased Economy provides a great view on sustainable innovations that have WUR Inside. The chosen topics are as diverse as bioplastics for restoring ecosystems till promoting circular fashion. You can run these six knowledge clips in both English and Dutch, as so is the leading information. Finally, all related WUR-publications are only one click away.
    Omgevingswet zet energietransitie op achterstand
    Kistenkas, F.H. ; Heide, C.M. van der - \ 2018
    Tijdschrift Milieu : Vereniging van milieuprofessionals 24 (2018)7. - p. 14 - 15.
    biobased economy - climate - renewable energy - sustainability - energy policy
    ‘We’ve still got a way to go’
    Thoden van Velzen, E.U. ; Molenveld, K. - \ 2018
    recycling - biobased economy - polymers - residual streams - organic wastes - biofuels - bioenergy - renewable energy
    Biobased performance materials in a circular economy
    Bolck, C.H. - \ 2018
    biobased economy - biobased materials - biomass - renewable energy
    De toekomst van hout in de biobased economy
    Annevelink, E. ; Harmsen, P.F.H. ; Spijker, J.H. - \ 2018
    Vakblad Natuur Bos Landschap 15 (2018)141. - ISSN 1572-7610 - p. 7 - 11.
    biobased economy - hout - biobrandstoffen - biomassa - hernieuwbare energie - materialen uit biologische grondstoffen - cellulose - lignine - vezels - biobased economy - wood - biofuels - biomass - renewable energy - biobased materials - cellulose - lignin - fibres
    De laatste jaren is de biobased economy sterk gegroeid door allerlei activiteiten, variërend van fundamenteel onderzoek naar nieuwe biobased toepassingen, tot het op commerciële schaal vervaardigen van biobased producten. Welke kansen biedt dit voor hout en houtige biomassa en wat zijn de verwachte effecten op de houtmarkt?
    De energiesector als lichtend of verblindend voorbeeld?
    Giezen, M. ; Brouwer, Stijn ; Roest, Kees ; Vliet, B.J.M. van - \ 2017
    H2O online (2017). - 6
    energie - water - hernieuwbare energie - systemen - economie - energy - water - renewable energy - systems - economics
    De energiesector wordt in de watersector veelvuldig genoemd als voorbeeld voor de transitie richting een circulaire economie. In hoeverre werkt dit verhelderend of juist verblindend? In deze literatuurstudie laten de auteurs hun licht schijnen op de energiesector als voorbeeld wanneer het gaat om de introductie van nieuwe decentrale technieken. Vanuit zowel een technologisch, economisch, sociaal-cultureel als een institutioneel perspectief brengen de auteurs de contextuele systeemveranderingen die van invloed kunnen zijn op toepassing van decentrale technieken in kaart. Hiermee worden de overeenkomsten en verschillen tussen energie- en watersectoren helder en ontstaat ruimte voor relativering en nuance.
    More food, lower footprint : How circular food production contributes to efficiency in the food system
    Scholten, M.C.T. - \ 2017
    Wageningen : Wageningen University & Research
    biobased economy - biobased chemistry - cycling - environment - sustainability - nutrition - biomass - renewable energy - residual streams - agricultural wastes - organic wastes - crop residues - food production - biobased economy - chemie op basis van biologische grondstoffen - kringlopen - milieu - duurzaamheid (sustainability) - voeding - biomassa - hernieuwbare energie - reststromen - agrarische afvalstoffen - organisch afval - oogstresten - voedselproductie
    Martin Scholten on circular food production. Ideas about how circular food production can contribute to the sustainable food security.
    Methodology for the case studies
    Smits, M.J.W. ; Woltjer, G.B. - \ 2017
    EU (Circular impacts ) - 19
    economics - cycling - projects - renewable energy - recycling - sustainability - durability - politics - policy - environment - economie - kringlopen - projecten - hernieuwbare energie - recycling - duurzaamheid (sustainability) - duurzaamheid (durability) - politiek - beleid - milieu
    This document is about the methodology and selection of the case studies. It is meant as a guideline for the case studies, and together with the other reports in this work package can be a source of inform ation for policy officers, interest groups and researchers evaluating or performing impact assessments of circular economy policies or specific circular economy projects. The methodology was developed to ensure that the case studies focus on the overall im pacts of the circular economy. The frame of the methodology is a s tep - by - step approach, which will be described in section s 3 and 4 of this document. In section 2 we describe the selection of the case studies.
    Philosophical explorations on energy transition
    Geerts, Robert-Jan - \ 2017
    Wageningen University. Promotor(en): Bart Gremmen; Guido Ruivenkamp, co-promotor(en): Josette Jacobs. - Wageningen : Wageningen University - ISBN 9789463430487 - 172
    philosophy - technology - sustainable energy - renewable energy - social change - energy consumption - quality - society - energy - filosofie - technologie - duurzame energie - hernieuwbare energie - sociale verandering - energiegebruik - kwaliteit - samenleving - energie

    This dissertation explores energy transition from a philosophical perspective. It puts forward the thesis that energy production and consumption are so intimately intertwined with society that the transition towards a sustainable alternative will involve more than simply implementing novel technologies. Fossil energy sources and a growth-based economy have resulted in very specific energy practices, which will change in the future. Broader reflection is needed to understand how and in which direction such change is acceptable and desirable.

    This reflection is initiated by articulating two pertinent problems with current energy practices that have thus far failed to receive appropriate attention in debates on energy transition: 1) the difficulty of dealing with intermittent sources in relation to the idea of cumulative accounting of energy consumption, and 2) the mismatch between expectations of ethical consumer behaviour in energy systems that discourage engagement.

    To move forward, instead of assuming that all consumption is equivalent and that more is better, we must develop a better informed and more nuanced idea of 'good' energy practices that actually contribute to our quality of life. One often overlooked aspect of this may be 'embodied engagement', which would suggest that automation of tasks through energy-consuming technologies may be convenient, but also tends to lead to a loss of appreciation for both the task and its result. Some things, like creating a cozy environment around a fireplace, or climbing a mountain, are better partly because they take effort. In such cases, the 'efficiency' of the technology (e.g. the heat-pump, or the automobile) is besides the point - the question is whether it gives us anything of value at all.

    Safely combining wind turbines and seaweed farms: research project on multipurpose sea
    Castel, Fanny ; Stuiver, M. - \ 2016
    biobased economy - bioenergy - seaweeds - renewable energy - biofuels
    Simulating plants: Research on photosynthesis will bear fruit
    Klein Lankhorst, R.M. ; Aarts, M.G.M. - \ 2016
    biobased economy - biofuels - photosynthesis - renewable energy - biomass - bioenergy - plants
    Duurzame energie 2050 : verkenning rol van (agrarische) ondernemers in de energietransitie naar 2050
    Wijnands, Frank ; Holster, Henri - \ 2016
    Wageningen : Praktijkonderzoek Plant & Omgeving, onderdeel van Wageningen UR - 33
    boeren - plattelandsomgeving - duurzame energie - energie - energievoorraden - hernieuwbare energie - farmers - rural environment - sustainable energy - energy - energy resources - renewable energy
    Rural entrepreneurs (farmers) are going to play a major role in the energy transitions towards 2050. In professional dialogues between farmers and pertinent stakeholders it was shown that farmers are already involved in all aspects and are in the right position. The transition needs to be facilitated in local initiatives.
    Biogas production and digestate utilisation from agricultural residues : deliverable nº: 6.2.1
    Corre, W.J. ; Conijn, J.G. - \ 2016
    HYSOL project - 39
    renewable energy - anaerobic digestion - biogas - crop residues - agricultural wastes - sustainable energy - electricity supplies - innovations - biobased economy - fermentation - digestate - hernieuwbare energie - anaërobe afbraak - biogas - oogstresten - agrarische afvalstoffen - duurzame energie - elektriciteitsvoorzieningen - innovaties - biobased economy - fermentatie - digestaat
    The HYSOL project aims at hybridisation of concentrated solar power with a gas turbine in order to guarantee a stable and reliable electricity supply, based on renewable energy. The production of fully renewable electricity in a Hybrid Concentrated Solar Power (HCSP) plant includes the use of renewable gas. In task 6.2 of the HYSOL project research into the possibilities of sustainable biogas production from agricultural residues by anaerobic digestion has been performed. In this report results are described of part of this research focussing on potential biogas production and digestate production and utilisation from animal manure and crop residues.
    Planten nabootsen : onderzoek naar fotosynthese gaat vruchten afwerpen
    Klein Lankhorst, Rene ; Aarts, Mark ; Amerongen, Herbert van - \ 2016
    biobased economy - biobased chemistry - biofuels - photosynthesis - biotechnology - biobased chemicals - energy sources - solar energy - renewable energy - techniques

    Planten zijn meesters in het gebruik van zonlicht. Daarmee zetten ze water en kooldioxide om in suikers en zuurstof. Wageningse onderzoekers kunnen dit proces nabootsen en verbeteren. Zo willen ze biobrandstoffen maken en beter groeiende gewassen

    Anaerobic digestion of cellulose and hemicellulose in the presence of humic acids
    Azman, Samet - \ 2016
    Wageningen University. Promotor(en): Fons Stams; Grietje Zeeman, co-promotor(en): Caroline Plugge. - Wageningen : Wageningen University - ISBN 9789462579613 - 189
    humic acids - hydrolysis - anaerobic digestion - cellulose - hemicelluloses - biomass - renewable energy - energy recovery - biogas - fermentation - bioprocess engineering - humuszuren - hydrolyse - anaërobe afbraak - cellulose - hemicellulosen - biomassa - hernieuwbare energie - energieterugwinning - biogas - fermentatie - bioproceskunde

    Research on the hydrolysis step of the AD became more important with the increased use of recalcitrant waste products such as manure, sewage sludge and agricultural biomass for biogas production. Hydrolysis is often the rate limiting step of the overall AD. Hydrolysis enhancement is one of the required steps to optimise biogas production. Despite the progress to overcome the limitations of hydrolysis, inhibition of hydrolysis is still poorly researched. Humic acid-like molecules (HA) are one of the inhibitors of the anaerobic hydrolysis and their effect on the overall AD process is generally overlooked.

    In this thesis, the HA inhibition on anaerobic digestion of cellulosic material and mitigation strategies, using cation and enzyme addition, to overcome the inhibition were investigated. In addition, the microbial community dynamics during AD in the presence and absence of HA were examined. In this scope, in Chapter 2, we reviewed the literature and pinpointed the urgent need for comprehensive studies on the role of hydrolytic microorganisms and environmental factors that effects their abundance within biogas plants. Consequently, the hydrolysis mechanism and involved hydrolytic enzymes were discussed. The overall discussion showed that a holistic approach, including microbiological and engineering studies should be chosen to disclose the role of hydrolytic microbes within biogas reactors. In Chapter 3 and, Chapter 4 the effect of HA on anaerobic cellulose hydrolysis and methanogenesis, in batch wise incubations is reported, respectively. Our results showed that pulse addition of 5 g L-1 HA caused a 50 % decrease in hydrolysis rate of anaerobic cellulose degradation (Chapter 3). Moreover, VFA accumulation was observed in the presence of HA during the anaerobic cellulose degradation, which indicated the possible inhibition of HA on methanogenesis. Based on the results of Chapter 3, pure cultures of methanogens and a mixed culture were tested to study the vulnerability of methanogenesis to HA inhibition. Hydrogenotrophic methanogenesis in pure cultures was inhibited by more than 75% in the presence of 1 g L-1 HA whereas, acetoclastic methanogenesis by Methanosaeta concilii was only slightly affected by HA up to 3 g L-1. When methanogenic granular sludge was incubated with HA, the specific methanogenic activity tests showed less inhibition, when compared to the pure cultures of methanogens. HA inhibition was also observed during long-term CSTR operation at an HRT of 20 days, 35°C and a mixture of cellulose and xylan as a subtrate (Chapter 6). 8 g L-1 HA inhibited the hydrolysis efficiency of the cellulose and xylan digestion by 40 % and concomitantly reduced the methane yields.

    Mitigation of the HA inhibition is required to increase the hydrolysis efficiency and methane yields of cellulosic biomass digestion. Therefore, two different strategies were tested for their potential use as mitigation agents, viz. addition of cations such as, calcium magnesium and iron (Chapter 3 and Chapter 6) and addition of hydrolytic enzymes (Chapter 6). Addition of magnesium, calcium and iron salts mitigated the HA inhibition and hydrolysis efficiencies reached up to 75, 65 and 72%, respectively, compared to the control groups in the batch wise incubations (Chapter 3). However, in long term CSTR operations, calcium addition did not show a positive effect on hydrolysis inhibition. On the other hand, enzyme addition helped to reverse the negative effect of HA.

    The microbial communities involved in AD were also studied. Chapter 5 and Chapter 6 dealt with microbial community analyses with 16S rRNA next generation sequencing. In Chapter 5, five replicate reactors were monitored during the start-up period. Transient feeding strategy was used to acclimatise anaerobic sludge to efficient cellulose and xylan degradation. During the experiment, Bacteriodales, Clostridiales and Anaerolineales became dominant bacterial populations while, Methanobacteriaceae and Methanospirillaceae were the dominant archaeal populations within the reactors. In Chapter 6, the microbial population dynamics in the presence and absence of HA were monitored. Microbiological analyses showed that the abundance of hydrolytic/fermentative bacterial groups such as Clostridiales, Bacteroidales and Anaerolineales was significantly lowered by the presence of HA. HA also affected the archaeal populations. Mostly hydrogenotrophic methanogens were negatively affected by HA.

    In conclusion, this thesis confirms that HA inhibit the hydrolysis and methanogenesis within both batch incubations and CSTR systems. Microbial populations were also affected by HA. Therefore, hydrolytic enzyme addition can be an option to mitigate HA inhibition and enhance hydrolysis and methanogenesis during conversion of biomass to biogas.

    Artificial photosynthesis : for the conversion of sunlight to fuel
    Purchase, R. ; Vriend, H. ; Groot, H. de; Harmsen, P.F.H. ; Bos, H.L. - \ 2015
    Leiden : Leiden University (Groene grondstoffen ) - ISBN 9789462575240 - 53
    zonne-energie - brandstoffen - duurzame energie - fotosynthese - hernieuwbare energie - technieken - biobased economy - solar energy - fuels - sustainable energy - photosynthesis - renewable energy - techniques - biobased economy
    The goal of this booklet is to raise awareness of the concept of artificial photosynthesis and its potential to become an additional and significant new option in our longer-term energy future.
    Advancing CapMix for electricity generation : system operation, cell design and material selection
    Liu, F. - \ 2015
    Wageningen University. Promotor(en): Cees Buisman, co-promotor(en): Bert Hamelers. - Wageningen : Wageningen University - ISBN 9789462573079 - 164
    hernieuwbare energie - bio-energie - energiebronnen - capacitantie - vermenging - zout water - zoet water - elektrodialyse - biobased economy - renewable energy - bioenergy - energy sources - capacitance - mixing - saline water - fresh water - electrodialysis - biobased economy

    ABSTRACT

    Capacitive energy extraction of the mixing process, also referred as Capacitive Mixing (CapMix), is a novel and promising technology that can convert salinity gradient power into electricity directly. This technology uses two porous activated carbon electrodes. The energy extraction is directly linked to the mixing process, while no emission of greenhouse gases and no thermal pollution occur. This emerging CapMix technology is still immature. In order to transform the proof-of-principle into a viable technology, many questions remain to be answered, not only in science (i.e. understanding what is happening), but also in technology (i.e. how to design and manufacture the system). In this thesis, the author investigated the optimized way to operate the system. Moreover, models were developed to understand the physical-chemical process; material including ion exchange membranes and activated carbon electrodes were evaluated; and the innovative cell design was made.

    Kunstmatige fotosynthese : voor de omzetting van zonlicht naar brandstof
    Purchase, R. ; Vriend, H. ; Groot, H.J.M. de; Bos, H.L. - \ 2015
    Leiden : Universiteit Leiden - ISBN 9789462573994 - 53
    zonne-energie - brandstoffen - duurzame energie - fotosynthese - hernieuwbare energie - technieken - biobased economy - solar energy - fuels - sustainable energy - photosynthesis - renewable energy - techniques - biobased economy
    Deze uitgave is bedoeld voor iedereen die geïnteresseerd is in wereldwijde ontwikkelingen op het gebied van duurzame energievoorziening. Het is een beschrijving van de mogelijkheden van solar fuels, brandstoffen die direct uit zonlicht worden geproduceerd en die een substantieel onderdeel kunnen gaan uitmaken van onze toekomstige energievoorziening.
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