A Review on the Potential and Limitations of Recyclable Thermosets for Structural Applications
Post, Wouter ; Susa, Arijana ; Blaauw, Rolf ; Molenveld, Karin ; Knoop, Rutger J.I. - \ 2019
Polymer Reviews (2019). - ISSN 1558-3724
circular economy - dynamic covalent cross-links - polymer matrix - recycling - Thermoset
The outstanding performance of conventional thermosets arising from their covalently cross-linked networks directly results in a limited recyclability. The available commercial or close-to-commercial techniques facing this challenge can be divided into mechanical, thermal, and chemical processing. However, these methods typically require a high energy input and do not take the recycling of the thermoset matrix itself into account. Rather, they focus on retrieving the more valuable fibers, fillers, or substrates. To increase the circularity of thermoset products, many academic studies report potential solutions which require a reduced energy input by using degradable linkages or dynamic covalent bonds. However, the majority of these studies have limited potential for industrial implementation. This review aims to bridge the gap between the industrial and academic developments by focusing on those which are most relevant from a technological, sustainable and economic point of view. An overview is given of currently used approaches for the recycling of thermoset materials, the development of novel inherently recyclable thermosets and examples of possible applications that could reach the market in the near future.
Groene Mineralen Centrale : Duurzame productie van mineralen, biogas en schoon water
Schoumans, O.F. ; Regelink, I.C. ; Ehlert, P.A.I. - \ 2018
Wageningen : Wageningen University & Research
SYSTEMIC Newsletter, issue 1
Schoumans, O.F. ; Regelink, I.C. ; Ehlert, P.A.I. - \ 2018
Wageningen : Wageningen University & Research - 3 p.
‘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
Er is nog veel te winnen
Thoden van Velzen, E.U. ; Molenveld, K. ; Hugenholtz, J. - \ 2018
biobased economy - recycling - biobased materials - biomass - residual streams - agricultural wastes - biofuels - bioenergy
Willen we ons huishoudelijk afval optimaal benutten, dan moeten we de grondstoffen erin efficiënter scheiden en terugwinnen. 'We zijn nog ver verwijderd van het ideale, circulaire beeld.'
Biobased materialen, circulaire economie en natuurlijk kapitaal
Overbeek, M.M.M. ; Smeets, E.M.W. ; Verhoog, A.D. - \ 2017
Wageningen : Wettelijke Onderzoekstaken Natuur & Milieu (WOt-technical report 109) - 37
biomassa - biobased economy - materialen uit biologische grondstoffen - bioplastics - hernieuwbare energie - duurzaamheid (sustainability) - biobrandstoffen - recycling - chemie op basis van biologische grondstoffen - biomass - biobased materials - renewable energy - sustainability - biofuels - biobased chemistry
This preliminary study investigates the amount of biomass that would be needed in the Netherlands to replace the fossil raw materials used in the manufacture of plastics and how this transition to biobased plastics can be achieved. It is based on desk research and calculations of the area of agricultural land that would be needed to produce sufficient biobased material to meet Dutch demand for biobased plastics. In addition, interviews were held with experts on the institutional obstacles to such a transition. Far too little agricultural land is available in the Netherlands to produce the required amount of biomass needed to replace fossil plastics. Research with the aim of increasing the contribution made by biobased materials to the circular economy should focus on assessing the options for producing sustainable raw materials and on a comprehensive assessment of the sustainable use of biomass in various applications.
Recyclebaarheid van verpakkingen op de Nederlandse markt : Huishoudelijke kunststof verpakkingen in sorteerproducten onderzocht op recyclebaarheid en hoeveelheid
Brouwer, M.T. ; Thoden van Velzen, E.U. - \ 2017
Wageningen : Wageningen Food & Biobased Research (Wageningen Food & Biobased Research report 1782) - ISBN 9789463438261 - 45
recycling - kunststoffen - containers - afvalverwerking - gedrag van huishoudens - sorteren - plastics - waste treatment - household behaviour - sorting
describes the recyclability of Dutch post-consumer plastic packages. It focusses on the recyclability of the packages at the Dutch households and those present in the sorting products (mainly Mix and Sorting Residue). The objective of this study was to comprehend which packages are currently not being recycled in the Dutch recycling system of plastic packaging waste. The research question answered in this report is:What is the recyclability of the post-consumer plastic packages on the Dutch market, especially the plastic packages at the households and in the sorting residue and Mix sorting product?This study has been performed in the period of June until September 2017 by researchers of Wageningen Food & Biobased Research (WFBR) and is commissioned and financed by the Koninklijke Nederlandse Vereniging voor Afval- en Reinigingsmanagement (NVRD). Other participants in the study were Midwaste, HVC and Omrin by delivering samples and additional information. The research has concisely been performed, making maximally use of an existing model of WFBR. The research was done objectively and independently.The main conclusion is that 56% of the packages on the Dutch market are recyclable. 6% of the packages can be recycled into utensils, but are not ideal as they disturb the recycling of other packages in more circular applications, such as coloured PET bottles and PP film. PET trays are not recyclable at the moment, but are potentially recyclable in the future. These packages are now being sorted in a separate sorting product and stored until a recycling process is available. The PET trays amount to 10% of the plastic packages. 28% of the packages on the Dutch market are not recyclable, these are mainly PS and PVC packages, laminated packages and blisters.There are still significant amounts of potentially well recyclable plastic packages present in the Mix sorting product, which would rather belong to the PE and PP sorting product. The sorting residue still contains some well recyclable packages, which gets lost via this route. Additionally, the sorting residue consist of large amounts of non-recyclable packaging, non-packages and residual waste, which are intentionally added to of the sorting residue.The Dutch recycling system for post-consumer plastic packages and their recyclability can be improved in three ways:- Better sorting; produce less Mix sorting product and sort more packages in the intended sorting category.- Design for recycling; packages that are non-recyclable can be changed or replaced by packages that are recyclable. For instance PS and PVC flasks can be replaced by PE or PP flasks. Design from recycling; packages that cannot be changed or replaced should be recycled by new or adjusted recycling technologies. For instance a part of the laminates and blisters.---Dit rapport is het resultaat van een studie naar de recyclebaarheid van kunststofverpakkingen, in het bijzonder de huishoudelijke kunststofverpakkingen. Hierbij is gekeken naar de recyclebaarheid van de verpakkingen op de Nederlandse markt en in de sorteerproducten (specifiek de Mix en sorteerrest). Het doel van deze studie is inzicht krijgen welke verpakkingen nu nog niet worden gerecycleerd in het huidige recyclingsysteem in Nederland.De onderzoeksvraag die in dit rapport beantwoord is:Wat is de recyclebaarheid van huishoudelijke kunststofverpakkingen op de Nederlandse markt, in het bijzonder de kunststofverpakkingen aanwezig bij de huishoudens en in de sorteerrest en de mengkunststoffen (Mix)?Deze studie is uitgevoerd in de periode van juni tot en met september 2017 door onderzoekers van Wageningen Food & Biobased Research (WFBR) in opdracht van de Koninklijke Nederlandse Vereniging voor Afval- en Reinigingsmanagement (NVRD), die tevens deze studie heeft gefinancierd. Daarnaast zijn Midwaste, HVC en Omrin participant geweest in de studie door het leveren van monsters en informatie. Het onderzoek is kort en krachtig uitgevoerd, waarbij gebruik is gemaakt van een bestaand basismodel ontwikkeld door WFBR. De onderzoekers hebben een objectief en onafhankelijk onderzoek uitgevoerd om deze vraag te beantwoorden.Uit het onderzoek blijkt dat 56% van de verpakkingen op de Nederlandse markt goed recyclebaar zijn. 6% van de verpakkingen is in principe goed recyclebaar naar toepassingen als gebruiksartikelen, maar niet ideaal omdat deze verpakkingen de recycling van andere verpakkingen richting meer circulaire toepassingen kunnen verstoren, zoals gekleurde PET flessen en PP folie. PET trays zijn nu nog niet recyclebaar, maar mogelijk wel recyclebaar in de toekomst. Deze verpakkingen worden nu wel in een aparte categorie gesorteerd, maar er moet nog een recyclingroute voor deze verpakkingen worden ontwikkeld. De PET trays bedragen 10% van de kunststofverpakkingen. 28% van de verpakkingen zijn slecht recyclebaar, dit zijn voornamelijk PS en PVC verpakkingen, laminaten en doordrukstrips.In het Mix sorteerproduct is nog een hoog aandeel goed recyclebare verpakkingen aanwezig, dit betreft voornamelijk verpakkingen die eigenlijk in het PE of PP sorteerproduct thuishoren. De sorteerrest bevat nog een deel goed recyclebare verpakkingen, die via deze route verloren gaan. Daarnaast bevat de sorteerrest een groot aandeel slecht recyclebare verpakkingen, niet-verpakkingen en restafval, zoals de bedoeling is voor de sorteerrest.Het Nederlandse recyclingsysteem kan op het gebied van recyclebaarheid van verpakkingen op een drietal punten verbeterd worden: - Beter sorteren; minder Mix produceren en meer verpakkingen in de gewenste sorteercategorie sorteren.- Design for recycling; slecht recyclebare verpakkingen die goed vervangen of verbeterd kunnen worden voor een recyclebare verpakkingen. Bijvoorbeeld PS en PVC flacons vervangen voor een PE of PP flacon.- Design from recycling; voor verpakkingen die niet vervangen of verbeterd kunnen worden, bijvoorbeeld een deel van de laminaten en doordrukstrips, nieuwe of aangepaste recycling technologieën ontwikkelen
Biodigestion at the Neighbourhood Level : from community participation to waste separation
Hiemstra, J. ; Lie, R. ; Rietveld, M. - \ 2017
Urban Agriculture Magazine (2017)32. - ISSN 1571-6244 - p. 49 - 51.
bio-energie - biobrandstoffen - biobased economy - reststromen - projecten - co-vergisting - digestaat - hernieuwbare energie - energiebronnen - organisch afval - recycling - bioenergy - biofuels - residual streams - projects - co-fermentation - digestate - renewable energy - energy sources - organic wastes
Urban Agriculture magazine • number 32 • September 2017 49 www.ruaf.org High energy bills and litter on the streets caused a group of residents of the Wildeman neighbourhood in the district of Osdorp in Amsterdam to act. Expecting no solution from the municipality, they decided to take care of it themselves and tackled these two problems with one solution: using the technology of biodigestion to produce energy from municipal food waste - a perfect example of the urban food-waste-energy nexus.
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.
Recyclingopties voor PET schalen
Thoden van Velzen, Ulphard - \ 2017
Wageningen : Wageningen Food & Biobased Research (Wageningen Food & Biobased Research rapport 1761) - 19
recycling - verpakkingsmaterialen - kunststoffen - afvalverwijdering - platte bakken - huisvuilverwijdering - packaging materials - plastics - waste disposal - trays - municipal refuse disposal
KringloopToets: sluiten van de nutriëntenkringloop op het niveau van Noordwest-Europa : inhoudelijke en procesmatige rapportage
Leenstra, Ferry ; Vellinga, Theun ; Bremmer, Bart - \ 2017
Wageningen : Wageningen Livestock Research (Wageningen Livestock Research rapport 1019) - 47
nutriëntenstromen - voer - diervoedering - diervoeding - recycling - noordwest-europa - nutrient flows - feeds - animal feeding - animal nutrition - northwestern europe
The Nutrient Cycle Assessment aims at visualizing nutrient flows. In policy documents closing of nutrient cycles at the level of North Western Europe is often mentioned. Province North Brabant, farmers organisation ZLTO and NGO BMF examined together with Wageningen University & Research the effects of closing the borders of North West Europe (Benelux, France, Germany, UK) for feed ingredients and animal products. The results of this exercise were discussed in a separate session with representatives of the feed industry. This report describes the conclusions of the analysis and the lessons that can be learned from this exercise for future work with the Nutrient Cycle Assessment.
Lift up of Lowlands : beneficial use of dredged sediments to reverse land subsidence
Figueiredo Oliveira, Bruna Raquel - \ 2017
Wageningen University. Promotor(en): Huub Rijnaarts, co-promotor(en): Tim Grotenhuis. - Wageningen : Wageningen University - ISBN 9789462578838 - 229
dredgings - dredging - sedimentation - soil - sediment - subsidence - recycling - environmental engineering - bagger - baggeren - sedimentatie - bodem - sediment - bodemdaling - recycling - milieutechniek
In this thesis, the beneficial use of dredged sediments to reverse land subsidence in lowlands and delta areas is explored. The major constraints for beneficial use of sediments are the contaminant concentrations, and the proper managing of supply and demand of sediments (Chapter 1).
When sediments are transferred from waterways to upland conditions, a series of processes take place that transform the waterlogged sediments into aerated soils, a process known as ripening. To understand the relation between the sediments and the soils formed, physical/chemical and biological processes were studied at three scales: laboratory scale, mesoscale, and field scale. The knowledge obtained with these experiments can provide guidelines to effectively use dredged sediments to reverse land subsidence.
In the laboratory experiments, the environmental conditions were controlled, leading to constant water content and optimal oxygen concentration for biological processes. In the mesoscale experiment, the environmental parameters such as wind, precipitation and temperature, were not controlled as the 1 m3 containers used for these experiments were placed outside, in open air conditions. Still, the water level could be monitored and controlled, and the subsidence of the dredged sediment could be monitored. In the field experiment, the environmental and filling conditions could not be controlled but the changes occurring in the deposit were monitored.
In the first laboratory experiment (Chapter 2) the behaviour of dredged sediments with varying particle size distribution and organic matter content was studied. The dredged sediments were dewatered using suction chambers and then submitted to biochemical ripening during 141 days. The five types of dredged sediments had similar overall behaviour. The most significant observation was that most volume lost during dewatering and biochemical ripening was due to shrinkage and not to organic matter mineralization. Furthermore, the type of organic matter changed in the direction of humification, i.e., more stable compounds were formed. The soils formed from biochemical ripening of dredged sediments had very stable aggregates and the load-bearing capacity was enough to sustain cattle and tractors.
The second laboratory experiment (Chapter 3) was designed to investigate the influence of mixing compost and the solid fraction of swine manure (low in nutrients) with dredged sediments on dewatering and biochemical ripening. When the supply of dredged sediments is too low to compensate for land subsidence, bio-wastes, such as compost and manure, can be mixed with the sediments to reverse land subsidence. The results of this experiment confirm that most volume lost during ripening was due to shrinkage and not due to organic matter mineralization. Adding compost or the solid fraction of manure to the dredged sediments enhances the changes in the type of organic matter and CO2 production, i.e., the addition results in increased rates of organic matter mineralization which is described in the literature as the priming effect. In addition, the undrained shear strength of the mixtures of sediments with compost or manure was three times higher than the measured values for the sediments alone, meaning that organic amendments will improve the characteristics of the soil formed from ripening of sediments.
The mesoscale experiment (Chapter 4) was performed during 400 days in 1m3 containers which allowed to control the water level. Two scenarios were tested: upland deposits in which the sediments are allowed to dry; and underwater deposits in which the water level is always 2 cm above the sediments. It was expected that the upland deposit conditions would lead to a higher subsidence than the underwater conditions. However, subsidence of the sediments was very similar for the two scenarios. Also in these experiments it was observed that most subsidence could be attributed to shrinkage and not organic matter mineralization, and the type of organic matter changed in the direction of humification. Furthermore, the water balance indicated that evapotranspiration results in higher loss of water than drainage. Still, in this case the undrained shear strength after 400 days of experiment was not enough to sustain cattle or tractors even though it increased with time.
The monitored field scale upland deposit of dredged sediments (Chapter 5) is located in the Wormer- en Jisperveld area – North Holland, the Netherlands. The deposit was filled in two stages reaching a maximum height of sediments of 195 cm. After 17 months of monitoring, the subsidence of the sediments was 119 cm to which an extra subsidence of 19.5 cm of the underlying soil due to the overburden pressure was added. The results observed in the upland deposit are in line with the laboratory and mesoscale results since subsidence could also be attributed to shrinkage and no significant changes in the organic matter content were observed. However, in the case of the upland deposit, the type of organic matter changed in the direction of humification during the first 8 months (March to November), then stabilized during 7 months (November to June), and changed in the direction of mineralization afterwards.
The outcomes of this research indicate that dredged sediments have the potential to reverse land subsidence. This statement is supported by the consistent results showing that the decrease in volume of dredged sediments is caused by shrinkage and not to organic matter mineralization as traditionally reported (Chapters 2, 3, 4, and 5).
In addition, in places where composted and stable bio-wastes are available, these can be added to dredged sediments to further reverse land subsidence. Still, in this case special attention should be given to the potential priming effect (Chapter 3).
Finally it is recommended to adapt the current practices of disposal of dredged sediments in upland deposits, since 19.5 cm of subsidence observed for the underlying soil in the upland deposit (Chapter 5), was caused by the overburden pressure of the dredged sediment. From the point of view of avoiding/reversing land subsidence it is recommended to spread thin layers (in the order of cm) of sediments over the land, although this might lead to an increase in the time and costs for the stakeholders involved in dredging and in managing the water boards.
How to achieve resource use efficiency in integrated food and biobased value chains : Vision paper
Annevelink, E. ; Gogh, J.B. van; Bartels, Paul ; Broeze, J. ; Dam, J.E.G. van; Groot, Jim ; Koenderink, N.J.J.P. ; Oever, M.J.A. van den; Snels, J.C.M.A. ; Top, J.L. ; Willems, D.J.M. - \ 2016
Wageningen : Wageningen UR - Food & Biobased Research - 24
biobased economy - resource utilization - value chain analysis - bioenergy - biomass - recycling - sustainable development - economic development - food production - biobased economy - hulpbronnengebruik - waardeketenanalyse - bio-energie - biomassa - recycling - duurzame ontwikkeling - economische ontwikkeling - voedselproductie
This publication contains a vision, formulated by research experts in food and biobased production, on how to achieve increased efficient and effective use of available resources during the production and (re)processing of biomass for food and biobased products, feed and energy. This paper briefly elaborates on the transition to a sustainable bio-economy (see graph 1), focusing on the needs and requirements from a value chain perspective.
Circular Solutions : Part IV From Waste to Resource
Annevelink, E. ; Bos, H.L. ; Meesters, K.P.H. ; Oever, M.J.A. van den; Haas, W. de; Kuikman, P.J. ; Rietra, R.P.J.J. ; Sikirica, N. - \ 2016
TO2 Federatie - 65
biobased economy - waste utilization - recycling - refuse - waste management - innovations - biobased economy - afvalhergebruik - recycling - vuilnis - afvalbeheer - innovaties
The fifth part of this report on Circular Solutions is about the circular principle From Waste to Resource. The purpose of this study is to select promising options for the implementation of this circular principle and to elaborate these options further.
Feed sources for livestock : recycling towards a green planet
Zanten, H.H.E. van - \ 2016
Wageningen University. Promotor(en): Imke de Boer, co-promotor(en): Paul Bikker; Bastiaan Meerburg. - Wageningen : Wageningen University - ISBN 9789462578050 - 251
cum laude - livestock - livestock feeding - feeds - resources - food wastes - leftovers - recycling - greenhouse gases - environmental impact - innovations - sustainable animal husbandry - animal production - vee - veevoeding - voer - hulpbronnen - voedselafval - etensresten - recycling - broeikasgassen - milieueffect - innovaties - duurzame veehouderij - dierlijke productie
Production of food has re-emerged at the top of the global political agenda, driven by two contemporary challenges: the challenge to produce enough nutritious food to feed a growing and more prosperous human population, and the challenge to produce this food in an environmentally sustainable way. Current levels of production of especially animal-source food (ASF), pose severe pressure on the environment via their emissions to air, water, and soil; and their use of scarce resources, such as land, water, and fossil energy. The livestock sector, for example, is responsible for about 15% of the global anthropogenic emissions of greenhouse gases and uses about 70% of global agricultural land.
Many proposed mitigation strategies to feed the world sustainably, therefore, focus primarily on reducing the environmental impact of the livestock sector, so-called production-side strategies. Other strategies focus on changing consumption patterns by reducing consumption of ASF, or on shifting from ASF with a higher environmental impact (e.g. beef) to ASF with a lower environmental impact (e.g. pork or chicken), so called consumption-side strategies.
Most of the environmental impact of production of ASF is related to production of feed. One production-side strategy to reduce the environmental impact is the use of products that humans cannot or do not want to eat, such as co-products, food-waste, and biomass from marginal lands for livestock feed (referred to as ‘leftover streams’ in this thesis). This strategy is effective, because feeding leftover streams to livestock transforms an inedible food stream into high-quality food products, such as meat, milk, and eggs.
Two production-side strategies that use leftover streams as livestock feed were explored in this thesis: replacing soybean meal (SBM) in diets of growing pigs with either rapeseed meal (RSM) or with waste-fed larvae meal. Replacing SBM with RSM in growing-pig diets was assessed because RSM became increasingly available following an increase in bio-energy production in the EU. In this strategy, therefore, the RSM content in pig diets increased at the expense of SBM. SBM is an ingredient associated with a high environmental impact. It was expected, therefore, that replacing SBM with RSM in pig diets would lead to a decrease in the environmental impact of pork production. Replacing SBM with waste-fed larvae meal was assessed because recent developments show the environmental benefits of rearing insects as livestock feed. Insects have a low feed conversion ratio (kg feed/kg product) and can be consumed completely, without residual materials, such as bones or feathers. The nutritional value of insects is high, especially as a protein source for livestock. Insect-based feed products, therefore, can replace conventional feed ingredients, such as SBM. Altogether this strategy suggests that waste-fed larvae meal might become an important alternative feed source in the future.
To gain insight into the status quo of the environmental impact of both mitigation strategies, replacing SBM with RSM or with waste-fed insects, we first used the attributional life cycle assessment (ALCA) method. Based on the ALCA method, results showed that each mitigation strategy was promising. Replacing SBM with RSM in growing pig diets hardly changed either global warming potential (GWP) or energy use (EU), but decreased land use (LU) up to 16% per kg body weight gain. As expected, feed production had the largest environmental impact, responsible for about 50% of the GWP, 60% of the EU, and 77% of the total LU. Feed production in combination with feed intake, were the most sensitive parameters; a small change in both these two parameters changed the results. Replacing SBM with waste-fed larvae meal in growing-pig diets showed that EU hardly changed, but GWP (29%) and LU (54%) decreased per kg body weight gain. Based on ALCA results, each mitigation strategy, therefore, seems to offer potential to reduce the environmental impact of pork production. An ALCA, however, has two disadvantages: it does not account for product-packages and it does not consider feed-food competition.
The first disadvantage of ALCA was that the complexity of dealing with product-packages is not fully considered. ‘Product-package’ refers to a multiple-output situation. During the processing of sugar beet, for example, beet-pulp and molasses are produced in addition to sugar. Sugar, beet-pulp, and molasses together form a ‘package of products’ because they cannot be produced independently from each other. An ALCA does not account for the fact that the production volume of the co-product(s) depends on the demand for the determining product (e.g. sugar), which results in the limited availability of co-products. Increasing the use of co-products in animal feed, consequently, results in reducing use of a co-product in another sector, requiring them to be replaced with a different product. The environmental impact of increasing the use of a co-product or food-waste, therefore, depends on the net environmental impact. The net environmental impact refers to the environmental benefits of using the product in its new application minus the environmental cost of replacing the product in its old application.
A consequential theoretical framework was developed to account for product-packages. The results, based on the consequential framework, contradicted standard ALCA results. The consequential LCA (CLCA) method we used for replacing SBM with RSM showed an increased GWP (up to 15%), EU (up to 12%), and LU (up to 10%) per kg body weight gain. Moreover, this CLCA method showed that replacing SBM with waste-fed larvae meal increased GWP (60%) and EU (90%), but decreased LU (73%) per kg body weight gain.
Accounting for product-packages increased the net environmental impact of each strategy, replacing SBM with RSM or with waste-fed larvae meal. The difference in results between ALCA and CLCA was especially large in the strategy with waste-fed larvae meal. The difference was caused mainly by the use of food-waste. Food-waste fed to larvae was used initially to produce bio-energy via anaerobic digestion. In CLCA, the environmental impact related to replacing the bio-energy function of food-waste with fossil-energy was included. The net environmental impact became negative, because environmental benefits of replacing SBM with waste-fed larvae meal were less than environmental costs related to the marginal energy source, i.e. fossil energy, replacing the bio-energy. Results of the indirect environmental impact, however, are situation specific: if the marginal energy source were wind or solar energy, the net environmental impact of using waste-fed larvae meal might be positive. Waste-fed larvae meal, therefore, appears to be an interesting mitigation strategy only when energy from wind and solar energy are used more dominantly than energy from fossil sources.
If results were based solely on ALCA, then these potentially negative impacts would have been overlooked. Consideration of the environmental consequences of product-packaging, therefore, is essential to determine total environmental costs. If policy makers or the feed industry want to assess the net environmental impact of a potential mitigation strategy, then we recommend to perform a CLCA instead of an ALCA. The framework developed in this thesis can be used to perform such an assessment.
The second disadvantage of an LCA was that it does not take into account feed-food competition, e.g. competition for land between humans and animals. Most LCA studies focus on the total amount of land required to produce one kg ASF. LCA studies do not account for competition for land between humans and animals, or so-called feed-food competition. In other words, they do not include, differences in the consumption of human-edible products by various livestock species or differences in the suitability of land used for feed production as land to cultivate food-crops directly. Given the global constraints on land, it is more efficient to grow food directly for human consumption rather than for livestock. To address the contribution of livestock to a future sustainable food supply, a measure for land use efficiency was developed, called the land use ratio (LUR). The LUR accounts for plant productivity, efficiency of converting human-inedible feed into ASF, and suitability of land for crop cultivation. The LUR also has a life-cycle perspective.
Results of the LUR illustrated that dairy cows on sandy soil, laying hens, and pig production systems in the Netherlands have a LUR >1.0. In terms of protein produced per m2, therefore, it is more efficient to use these soils for livestock production to produce crops for direct human consumption than to produce feed for livestock. Only dairy cows on peat soil produce human digestible protein (HDP) more efficiently than crops do, because peat is not suitable for crop production. The LUR allows identification of livestock production systems that are able to produce HDP more efficiently than crops do. Livestock systems with a LUR<1.0, such as dairy on peat, have an important role to play in future sustainable nutrition supply.
Results of the LUR showed that livestock production systems using mainly co-products, food-waste, and biomass from marginal land, can produce human digestible protein more efficiently than crop production systems do. The availability of those leftover streams, however, is limited and, therefore, the amount of ASF produced based only on leftover streams is also limited. Because LUR is a ratio, LUR results do not give an indication of how much ASF can be produced based on livestock systems that feed mainly on leftover streams.
The third, and last, mitigation strategy, therefore, focused on the amount of ASF that can be consumed by humans, when livestock are fed only on leftover steams, also referred to as “default livestock”. The calculation of the amount of ASF was based on the assumption that a vegan diet was consumed in principle. The resulting co-products and food-waste were fed to pigs and, biomass from grazing land was fed to ruminants. Results showed that in total 21 g animal source protein per person per day could be produced by feeding livestock entirely on leftovers.
Considering feed-food crops and feeding food-waste made an important contribution to the 21 g of protein that could be produced from default livestock. Considering feed-food crops implies that choices have to be made between different crops, based on their contribution to feed and food production. Oil production from soy cultivation, for example, resulted in the co-product SBM. Results showed that considering feed-food crops can affect the final protein production from pork. The practice of feeding food-waste to livestock is currently prohibited due to problems of food safety but the practice shows potential in extensively reducing the environmental impact of livestock production. Considering feed-food crops and feeding food-waste are examples of mitigation strategies that currently can be implemented to reduce further the environmental impact of the livestock sector.
On average, it is recommended to consume about 57 g of protein from ASF or plant-origin per person per day. Only ASF from default livestock does not fulfil the current global protein consumption of 32 g per person per day, but about one third of the protein each person needs can be produced without any competition for land between feed and food production. To feed the world more sustainably, by requiring livestock production systems with a LUR <1.0, however, a paradigm shift is needed. Global average consumption of ASF should decrease to about 21 g of protein per person per day. Innovations are needed, moreover, to overcome problems of food safety and technical concerns related to collecting the leftover streams. This applies, in particular to food-waste, which is currently unused in livestock production but which presents a valuable strategy in mitigating environmental impacts caused by livestock production. Livestock systems should change their focus, furthermore, from increasing productivity per animal towards increasing protein production for humans per ha. By using leftover streams optimally, the livestock sector is able to produce a crucial amount of protein, while still avoiding competition for land between feed and food crops. Livestock, therefore, can make an important contribution to the future nutrition supply.
Kringlopen - Grondstoffen : Kennisclip Bogo-project e-learning
Baltissen, A.H.M.C. - \ 2016
cycling - resource conservation - biobased economy - renewable resources - recycling - horticulture - teaching materials - kringlopen - hulpbronnenbehoud - biobased economy - vervangbare hulpbronnen - recycling - tuinbouw - lesmaterialen
Deze kennisclip maakt onderdeel uit van de lesmodule Biobased Economy van het CIV T&U.
Compost en nuttige organismen kunnen weerbaarheid verhogen (interview van Tijs Kierkels met Joeke Postma)
Postma, Joeke - \ 2015
greenhouse horticulture - cultural methods - cropping systems - substrates - composts - soil organic matter - recycling - vegetables - soil suppressiveness
Phosphorus recycling from the waste sector
Ruijter, F.J. de; Dijk, W. Van; Curth-van Middelkoop, J.C. ; Reuler, H. van - \ 2015
Plant Research International, Wageningen UR (Rapport / Plant Research International 641) - 29
phosphorus - waste water - composts - recycling - sewage sludge - sludges - fosfor - afvalwater - compost - recycling - rioolslib - slib
An efficient use of phosphorus (P) is necessary as phosphate rock is a finite resource and P is essential for crop production. From the waste sector in the Netherlands, 23 Mkg P is sequestered in landfill, incineration ashes and cement. Flows containing P are discussed, together with options to recover P and reduce P losses, and the interactions between these options.
Fosforstromen door landbouw, industrie, huishoudens en afval
Curth-van Middelkoop, J.C. ; Dijk, W. van; Reuler, H. van; Ruijter, F.J. de; Smit, A.L. - \ 2015
V-focus 2015 (2015). - ISSN 1574-1575 - p. 36 - 38.
fosfaat - kringlopen - landbouw en milieu - agro-industriële ketens - samenleving - afvalhergebruik - overschotten - afvalverwerking - bodemchemie - oppervlaktewater - dierlijke meststoffen - recycling - phosphate - cycling - agriculture and environment - agro-industrial chains - society - waste utilization - surpluses - waste treatment - soil chemistry - surface water - animal manures - recycling
Fosfaat: we horen de term vaak in combinatie met overschot. In de landbouw spelen voer, mest en land daar een rol in. Maar hoeveel fosfaat komt er vrij uit de maatschappij? Wat als we dat fosfaat willen recyclen voor landbouwkundige doeleinden? In een studie naar fosforstromen is nagegaan hoe groot de stromen in Nederland zijn.
Handbook for sorting of plastic packaging waste concentrates : separation efficiencies of common plastic packaging objects in widely used separaion machines at existing sorting facilities with mixed postconsumer plastic packaging waste as input
Jansen, M. ; Thoden van Velzen, E.U. ; Pretz, Th. - \ 2015
Wageningen : Wageningen UR - Food & Biobased Research (Reports of Wageningen UR Food & Biobased Research 1604) - ISBN 9789462575295 - 30
recycling - packaging materials - plastics - waste management - waste treatment - sorting - sorters - verpakkingsmaterialen - kunststoffen - afvalbeheer - afvalverwerking - sorteren - sorteermachines
Hergebruik van huishoudelijk kunststofverpakkingsafval is een ingewikkelde keten die in het algemeen uit drie stappen bestaat; gescheiden inzameling bij de burgers of nascheiding uit het huisvuil, sorteren en opwerken tot gewassen maalgoed. Dit onderzoek analyseert de tweede stap, waarin of gescheiden ingezameld kunststofverpakkingsafval of nagescheiden kunststofconcentraat wordt gesorteerd in materiaalfracties die verhandeld kunnen worden met recyclingbedrijven.