It is of utmost importance to collect organic waste from households as a separate waste stream. If collected separately, it could be used optimally to produce compost and biogas, it would not pollute fractions of materials that can be recovered from residual waste streams and it would not deteriorate the quality of some materials in residual waste (e.g. paper). In rural areas with separate organic waste collection systems, large quantities of organic waste are recovered. However, in the larger cities, only a small fraction of organic waste is recovered. In general, citizens dot not have space to store organic waste without nuisances of smell and/or flies. As this has been the cause of low organic waste collection rates, collection schemes have been cut, which created a further negative impact. Hence, additional efforts are required. There are some options to improve the organic waste recovery within the current system. Collection schemes might be improved, waste containers might be adapted to better suit the needs, and additional underground organic waste containers might be installed in residential neighbourhoods. There are persistent stories that separate organic waste collection makes no sense as the collectors just mix all municipal solid waste after collection, and incinerate it. Such stories might be fuelled by the practice that batches of contaminated organic waste are indeed incinerated. Trust in the system is important. Food waste is often regarded as unrein. Users might hate to store food waste in their kitchen that could attract insects, or the household pets. Hence, there is a challenge for socio-psychological research. This might also be supported by technology, e.g. organic waste storage devices and measures to improve waste separation in apartment buildings, such as separate chutes for waste fractions. Several cities have experimented with systems that collect organic wastes by the sewage system. By using a grinder, kitchen waste can be flushed into the sewage system, which in general produces biogas by the fermentation of sewage sludge. This is only a good option if the sewage is separated from the city drainage system, otherwise it might create water pollution. Another option might be to use grinders, that store the organic waste in a tank. This tank could be emptied regularly by a collection truck. Clearly, the preferred option depends on local conditions and culture. Besides, the density of the area, the type of sewage system and its biogas production, and the facilities that are already in place for organic waste collection are important parameters. In the paper, we will discuss the costs and benefits of future organic waste options and by discussing The Hague as an example.
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Wat zijn de mogelijkheden voor de decentrale verwerking van organische reststromen? Levert het lokaal verwerken van materialen als gft-afval, snoeiafval, horeca-afval en gewasresten in brede zin meer op dan afvoer naar grootschalige verwerkers? Die vraag staat centraal in het project RE-ORGANISE, geleid door de Hogeschool van Amsterdam in samenwerking met Aeres Hogeschool Dronten, verschillende andere kennispartners en ondernemers.In dit rapport wordt een overzicht gecreëerd van wat er technisch mogelijk is met de organische reststromen. Daartoe zijn zogenaamde factsheets opgesteld per technologie, die een beschrijving omvatten van wanneer en hoe verschillende verwerkingstechnologieën decentraal toe te passen zijn op organische reststromen.
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Industrial Symbiosis Networks (ISNs) consist of firms that exchange residual materials and energy locally, in order to gain economic, environmental and/or social advantages. In practice, ISNs regularly fail when partners leave and the recovery of residual streams ends. Regarding the current societal need for a shift towards sustainability, it is undesirable that ISNs should fail. Failures of ISNs may be caused by actor behaviour that leads to unanticipated economic losses. In this paper, we explore the effect of these behaviours on ISN robustness by using an agent-based model (ABM). The constructed model is based on insights from both literature and participatory modelling in three real-world cases. It simulates the implementation of synergies for local waste exchange and compost production. The Theory of Planned Behaviour (TPB) was used to model agent behaviour in time-dependent bilateral negotiations and synergy evaluation processes. We explored model behaviour with and without TPB logic across a range of possible TPB input variables. The simulation results show how the modelled planned behaviour affects the cash flow outcomes of the social agents and the robustness of the network. The study contributes to the theoretical development of industrial symbiosis research by providing a quantitative model of all ISN implementation stages, in which various behavioural patterns of entrepreneurs are included. It also contributes to practice by offering insights on how network dynamics and robustness outcomes are not only related to context and ISN design, but also to actor behaviour.
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In June 2016, two Dutch SME companies which are active in the area of urban solid waste management approached the International Environmental Sciences department of Avans about the current R&D activities on urban solid waste management in cooperation with the Federal University of Minas Gerais (UFMG) Brazil. The companies had interest in developing activities in Brazil, since they are aware of the great potential for exporting both knowledge and technology. Solid waste poses a major problem in Brazil which affects 200 million residents. The Brazilian municipalities collect around 71 million tons solid municipal waste on a yearly basis and only a tiny percentage of this collected waste gets recycled. As such. the overwhelming majority of the collected urban solid waste goes to landfills. Within the State of Minas Gerais there are 850 towns of which 600 have less than 20.000 residents and are agriculturally oriented. Current organic waste composting practices take place under very poor conditions (pathogens and weeds still remain in the compost) and most often the resulting compost product is not well received by its residential and agricultural consumers. As such there is huge room for improvement. The SME companies work with Avans and UFMG to address these challenges. The joint research team consisting of the two Dutch SME companies and the two Research and educational institutes have defined the following research question: What is the current status of organic solid waste management in Minas Gerais and how can cooperation between Brazil and the Netherlands result in a win-win for both countries? Two individual KIEM VANG proposals have been defined in order to address these challenges. The planned activities are a joint effort with professor R. T. de Vasconcelos Barros of the Universidade Federal de Minas Gerais (UFMG) and are executed within the Living Lab Biobased Brazil program (www.biobasedbrazil.org).
Compostering van organische reststromen is een bekende technologie om organische afvalstro-men op duurzame manier te verwerken. Doel van deze KiemVang aanvraag is het verkennen van vermicomposting op het landgoed van VHL en bij koffiebranderij Peeze als mogelijkheid om orga-nisch afval duurzaam te verwerken. Vermicompostering onderscheidt zich van conventionele com-postering door de inzet van wormen, waardoor een product (wormenhumus) ontstaat met specifieke eigenschappen, die o.a. goed zouden zijn voor de bodemgezondheid. Dit project beoogt om op klei-ne schaal te pilotten met vermicomposting, waarbij studenten deelopdrachten uitvoeren bij VHL en/of Peeze. Startpunt van de verkenning is het in kaart brengen van de verschillende organische reststromen en het formuleren van verschillende recepturen opgesteld om wormenhumus te ma-ken. In testopstellingen wordt vervolgens het composteerproces getoetst. Monitoring vindt plaats van o.a. de reductie in afval en de kwaliteit van het eindproduct. Tot slot is de toepassing van de gevormde wormenhumus punt van onderzoek. Vraag hierbij is of de humus volledig door VHL en Peeze zelf kan worden benut, of dat afzet naar de lokale gemeenschap gewenst en mogelijk is. Ook is inzicht nodig in de geldende wet- en regelgeving om het proces in de toekomst op grotere schaal te kunnen implementeren. De achterliggende onderzoeksvraag is hoe vermicomposting een bijdrage kan leveren aan duurzame afvalverwerking en het sluiten van kringlopen. Het project draagt ook bij aan de actualisatie van praktijkonderwijs wat betreft circulaire economie.
The expanding world’s population challenges the way we produce and supply food. The ever-increasing production of food and its subsequent generated biomass forms immense risks to the environment and, eventually, public health. Aside from developing innovative food production methods (hydroponics, non-toxic pesticides, resistant species), the generation of waste biomass remains a challenge. Large volumes of food waste are processed in animal food, biofuel or used as a composting source, while these by-products are valuable sources of bioactive compounds (BACs). The processing of fruits and vegetables generates a variety of biomass such as peels, seeds and pulp that contain high-value compounds such as polyphenols. These BACs are implemented in pharmaceutical products or food supplements for their beneficial influence on human health, such as antioxidant or anti-inflammatory properties. The valorization and extraction of these compounds originating from agricultural waste streams is a key strategy for recycling and reusing food waste and, subsequently, reducing the environmental impact caused by waste streams. Additionally, the ability to further process food waste into valuable compounds can provide an extra source of income for the agricultural sector, supporting local economies. Local pharmaceutical companies are interested in developing methods to extract BACs from local sources since the current market is strongly dependent on the Asian market. Phytopharma finds the production of local food supplements crucial for the local circular economy and their sustainable business. During this project, the consortium partners will investigate sustainable extraction methods of BACs from local waste streams (duurzame chemie: bronnen en grondstoffen). More specifically Zuyd, CHILL and Phytopharma will pursue the “green” extraction of quercetin (BACs) from locally sourced onion waste. The partners will explore various extraction and purification methods needed to evaluate a potentially sustainable business model. Furthermore, the bioavailability of quercetin will be enhanced by encapsulation.
