Circular Food Research Articles

Upcycling to a circular food system

Upcycling to a circular food system

Transformative potential from the ground up: Sustainable innovation journeys, soft change and alignment of interests in urban food initiatives

This paper utilises the ‘sustainable innovation journeys’ concept to trace how people organise and design urban food initiatives and influence city-region food policy. We evaluate whether designs succeed or fail and monitor the exchange of ideas that takes place between stakeholders. Tracing these interactions reveals the transformative potential of innovative projects, particularly if the food system changes they bring to the fore are aligned with policy interests. Three case studies provide on-the-ground insights to assess how small and medium-sized enterprises at the micro-level induce sustainability shifts. The case studies are businesses in the city-regions of Rotterdam, The Netherlands (urban farm and circular food economy); Vigo, Spain (food, forest and multi-functional land use); and Zurich, Switzerland (organic food and short supply chains). Each initiative was studied in-depth over a two-year period, with follow-up analysis for a further four years to monitor change over time (2013–2018). The cases promote the adoption of micro-level innovation practices: locally designed transition pathways that bring the benefits of change to the city-region (i.e. from the micro-level initiative to meso-level policy). The analysis highlights the importance of ‘soft change’. This can be something as simple as visiting an inspiring urban food initiative and meeting with stakeholders to generate mutual understanding, from where interests align to influence food chain practices and policy. Soft changes act as ‘seeds of transition’ for a shift towards more sustainable urban food systems, but we observe too potentially negative impacts due to lack of alignment at the micro- (initiative) or meso- (city-region) levels.

Environmental and economic performance of Dutch dairy farms on peat soil

CONTEXTGlobal demand for milk is increasing, however, the dairy sector has considerable environmental impact and cattle are large contributors to greenhouse gas (GHG) emissions that lead to global warming. In a circular food system, the role of animals should be to convert biomass that humans cannot or do not want to eat into nutrient-dense products. In this system, dairy cows are only fed with grass from marginal lands and by-products from harvesting and food industries. One example of marginal land are peat areas, since these soils are mainly too wet for arable crop production. However, drainage caused peat to oxidize and emit CO2 and N2O. OBJECTIVEThe objective of this study was to evaluate global warming potential (GWP) and economic performance of Dutch dairy farms on peat compared to sandy soil. Also, two scenarios that might reduce GHG emissions of a dairy farm on peat soil were considered: 1) increased groundwater tables and 2) an adjusted dairy cow diet consisting of grass and by-products only. METHODSA whole-farm linear programming (LP) model used for dairy farms on sandy soil was updated and adjusted to simulate structure, management and labour income of a dairy farm on peat soil. The basic LP model is a static year model that includes all relevant activities and constraints that are common to a Dutch dairy farm and the solution generates feeding management, manure application and land use. The objective function maximized labour income. In addition, the linear model was combined with a Life-Cycle Assessment to determine the GWP of the produced milk, economically allocated between milk and meat. RESULTS AND DISCUSSIONThe results of this study showed that dairy farms on peat soil have lower labour income and considerably higher GWP compared to dairy farms on sandy soil. When the groundwater table on peat soil was increased, labour income decreased even more, however GHG emissions were somewhat reduced. Feeding a dairy cow diet with only grass and by-products resulted in higher labour income, but equal GWP compared to a regular dairy farm on peat soil. A sensitivity analysis was performed to explore the effect of grass yield on the economic and environmental performance of dairy farms on peat soil. SIGNIFICANCEDairy farms on peat soils have lower labour income and considerably higher GWP compared to sandy soils. Improvement of GWP is possible and can lead to increased labour income.

Food Connects Washington DC in 2050—A Vision for Urban Food Systems as the Centerpieces of a Circular Economy

This article presents a vision for an urban food system in Washington DC in 2050 that serves as the centerpiece of a circular economy for the capital region of the United States. Food serves as the connecting link for an inclusive, adaptive, and resilient urban economy embedded in the region. This food economy values natural resources, cultural diversity, and commitment to nature-based innovations. The vision is the result of a three-pronged methodology of: (1) community engagement; (2) a thoughtful, process-focused transformation; and (3) the scaling up of existing urban food initiatives. We argue that small, hyperlocal, neighborhood-based initiatives can become crucial game changers and catalysts of change for entire neighborhoods, cities, and regions. Therefore, we propose a design-based approach to advance our 2050 vision of a circular food system. Our design-based approach consists of three building blocks: (A) systems thinking; (B) the ability to manage wins and tradeoffs; and (C) transitional leadership and cooperation. We explain these building blocks and the way in which they are incorporated in the 2050 vision of Washington DC. We further argue that the food economy is an ideal sector to embark on such a design-based approach due to its systemic nature, its critical position as an indispensable economic sector, and the complex connections it brings to multiple other sectors of the economy. An urban food system can therefore offer the ideal starting point for a transition towards a circular economy.

Moving from Niche to Norm: Lessons from Food Waste Initiatives

For a transition to a circular economy to take place, behavioural change from people who are part of the transition is a key requirement. However, this change often does not occur by itself. For systemic behavioural change, policy instruments that incentivise behaviour supporting circular food systems play a key role. These instruments need to be aligned with the environment in which the behaviour takes place. In this study, we scrutinise a case study with five initiatives on the reduction of food loss and waste (FLW) contributing to a circular food system, to understand how specific, well-targeted combinations of instruments as well as other contextual and personal factors can fuel the transition to a circular economy and the reduction of FLW. All the initiatives are taking place under the umbrella of the Dutch initiative “United against food waste” (STV). We use a behavioural change perspective to assess how initiatives that support circular food systems arise and how they can be further supported. Based on the case-study analysis, we arrive at five common success traits and barriers, and five key needs for upscaling. We conclude that motivated, inspiring frontrunners are of key importance in the initial phase of a transition process. However, once a niche initiative is ready to be scaled up, the enabling environment becomes increasingly important.

Circular Food Futures: What Will They Look Like?

Potentially dramatic changes in the organisation of the food system are being driven by both consumers and producers. Consumers are demanding higher quality produce and more direct connection to producers. For farmers, more extreme weather events and global competition are increasingly making industrial agriculture less economically viable. This paper explores how circular economy (CE) debates might contribute to, and support, the changes needed for a sustainable future. Full compliance with the three objectives of a CE identified by the Ellen MacArthur Foundation might help to describe a sustainable and circular food future. An analysis of the food system is therefore carried out to determine how food systems may be organised to (a) design out waste and pollution, (b) keep products and materials in use and (c) regenerate natural systems. One critique of CE debates is the failure to explore systemic shifts and possible futures that are not an extrapolation of current conditions. This analysis of the food system points to the need for a decentralised network of diverse, polyculture farms, each with integrated energy and water micro-grids, and managed at a local level. Co-locating food producers with food consumers, as much as possible, creates an integrated village system at the food-water-energy-housing nexus. Villages may then be networked to enable collaboration for sharing of rarer skills or the satisfaction of more complex needs and wants, forming a trading network of circular economy villages. It is therefore posited that the transition to a fully circular economy will require a paradigm shift—another agricultural revolution—the transition away from large-scale industrial agriculture to a decentralised network of circular food systems.

A resource-based phosphorus footprint for urban diets

Large amounts of phosphorus resources, such as mineral fertilizers and manure, are mobilized globally to produce the food consumed in cities. Accounting for the use of these resources can allow cities to plan for interventions that reduce related pressures in their hinterlands, conserve resources, and lead to more circular food systems. In this study we calculate a resource-based phosphorus footprint for the food consumption in Brussels Capital Region and use it to compare different strategies towards increased circularity: waste reuse, waste reduction, dietary changes and shifts to locally produced food. The P footprint of an average inhabitant in Brussels is 7.7 kgP cap yr−1, 10 times higher than the physical P consumption of 0.7 kgP cap yr−1. About 60% of the total P inputs into food production are through manure, and the rest through mineral fertilizers; almost 80% of the inputs occur outside Belgium. Most of these inputs are related to the cultivation of feed for livestock, which is why a shift to vegetarian and vegan diets can reduce the footprint down to 4.8 kgP cap yr−1 and 0.9 kgP cap yr−1. To the contrary, consuming only food produced in Belgium would increase the footprint to 12 kgP cap yr−1, mostly as a result of the high manure use in the north of the country. A reduction in the P footprint signifies an absolute reduce in total resource use that can alleviate pressures in the hinterland and promote a city’s transition towards circularity.

Impact of information hiding on circular food supply chains in business-to-business context

This study has analyzed food supply chains from the circular economy viewpoint with a focus on knowledge hiding. In this paper, we examine the practice of hiding knowledge among stakeholders, in which dimension, what this knowledge is and whether there are differences among specific groups of stakeholders. This is applied to distributors, producers, consumers, retailers, suppliers and farmers working within the meat industry in Turkey. It shows how information hiding affects the traceability of food supply chains and circularity in the meat industry. Three different theories have been examined in this paper. Stakeholder theory helps to analyze traceability of food supply chains among stakeholders; the theory of industrial symbiosis aims to achieve an efficient circular food supply chain through 9R (refuse, rethink, reduce, reuse, repair, refurbish, remanufacture, repurpose, recycle, recover) strategies by adopting traceability; the information theory is a key enabler to coordinate traceability from farm to fork to support a circular food supply chain. By using the theoretical lens, this paper sets out proposals for policymakers and managers in food supply chains to ensure traceability and transparency to achieve circular economy. Although some prior studies address knowledge hiding, information hiding hasn’t been examined with traceability and transparency dimensions in Circular Food Supply Chain (CFSC) in B2B business. This study attempts to fill this gap in the literature, improve theoretical understanding with our proposed framework and validating the impact of information hiding and reveal where knowledge is mostly hidden in terms of circular economy, stakeholders and 9Rs in the meat industry. A proposed framework for managers and policymakers based on a circular economy can bring social, economic and environmental benefits for the red meat industry in Turkey. Additionally, it offers a framework and recommendations for other countries and industries for possible adoption.

Analyzing Barriers of Circular Food Supply Chains and Proposing Industry 4.0 Solutions

The concept of the circular economy (CE) has gained importance worldwide recently since it offers a wider perspective in terms of promoting sustainable production and consumption with limited resources. However, few studies have investigated the barriers to CE in circular food supply chains. Accordingly, this paper presents a systematic literature review of 136 papers from 2010 to 2020 from WOS and Scopus databases regarding these barriers to understand CE implementation in food supply chains. The barriers are classified under seven categories: “cultural”, “business and business finance”, “regulatory and governmental”, “technological”, “managerial”, “supply-chain management”, “knowledge and skills”. The findings show the need to identify barriers preventing the transition to CE. The findings also indicate that these challenges to CE can be overcome through Industry 4.0, which includes a variety of technologies, such as the Internet of Things (IoT), cloud technologies, machine learning, and blockchain. Specifically, machine learning can offer support by making workflows more efficient through the forecasting and analytical capabilities of food supply chains. Blockchain and big data analytics can provide the necessary support to establish legal systems and improve environmental regulations since transparency is a crucial issue for taxation and incentives systems. Thus, CE can be promoted via adequate laws, policies, and innovative technologies.

Incorporation of Fermented Brewers Spent Grain in the Production of Sourdough Bread

The utilisation of food production by-products back into food production within a circular food economy is one of the driving examples to improve sustainability within the food industry. Brewers spent grain is the most abundant by-product from the brewing industry, with currently most of it being used as animal feed. In this study, we utilised brewers spent grain as a substrate in a solid-state fermentation in order to produce a Type-3 sourdough culture. Sourdough bread is becoming increasingly popular throughout the western world. The use of fermented brewers spent grain in the production of sourdough bread yielded sourdough bread that was acceptable by consumers. We also investigated the production and presence of the main organic acids in sourdough during the proofing process and the baking process. The baking trials showed that there was a reduction in both lactic and acetic acid content during the actual baking process. The reduction in the concentration of both organic acids appears to be at the heart of the observation that for both organic acids, there is typically a lower concentration in the crust compared to the crumb of the sourdough breads, which was observed in our sourdough breads and those commercially available.

Managing a Circular Food System in Sustainable Urban Farming. Experimental Research at the Turku University Campus (Finland)

People around the world pay increasingly more attention to health, social, environmental, and ethical issues. As a consequence, they seek value in food that is fresh, less processed, and sustainably sourced. The article presents an experimental project supporting the implementation of a circular food system in the city of Turku, Finland. The outcome of the project is a globally replicable concept of managing a local circular food system in sustainable urban farming. The project had two objectives: (1) to reduce food waste in restaurants in the Turku University Campus; (2) to support local recycling of nutrients by composting food waste generated in the pilot restaurant and reuse the nutrients in the process of urban farming. The presented concept is based on the results of two experimental studies. It ties in with UN and EU sustainable development strategies and policies, e.g., Sustainable Development Goals (2, 11, and 12), the European Green Deal, the Farm to Fork Strategy, and the concepts of Circular Economy and Sustainable Cities.

Circular Cities: What Are the Benefits of Circular Development?

If cities could become regenerative and adaptive urban ecosystems, in which resource loops were closed and waste was obsolete, their ecological footprint would diminish. In addition, urban resource security would increase, the health of urban populations would improve and urban greenhouse gas emissions would be reduced. These are the principle goals under-pinning the circular city. Circular cities emerge through the process of circular development. Circular development alters cities’ systems of provision to enable circular practices of inhabitants to develop. This manifests as circular food systems and construction, water and nutrient recycling; adaptive reuse of spaces and pop-up activities; bioremediation of contaminated sites and integration of blue-green infrastructure throughout cities. To transform our cities will require significant investment, political support and public engagement. If the benefits of adopting such an approach can be identified, this will begin to make the case for support. The research presented in this paper draws on an inductive and deductive content analysis of relevant literature and interviews with those implementing circular projects in European cities (London, Paris, Amsterdam and Stockholm). It provides a clear definition of the normative concept of circular development. It creates a framework of benefits which are likely to accrue from adopting this approach. It points to the synergistic benefits emerging from circular development. It also highlights problems around valuation of those benefits, the unintended consequences of circular development and the inequalities in accessing benefits across society.

Life cycle assessment of fish oil substitute produced by microalgae using food waste

Fish oil has been used in conventional aquaculture for decades, despite the known links between increasing global demand for fish and depletion of natural resources and vital ecosystems (FAO, 2020, 2019). Alternative feed ingredients, including algae oil rich in docosahexaenoic acid (DHA), has therefore been increasingly used to substitute traditional fish oil. Heterotrophic algae cultivation in bioreactors can be supported by a primary carbon feedstock recovered from food waste, a solution that could reduce environmental impacts and support the transition towards circular food systems. This study used life cycle assessment to quantify environmental impact of DHA produced by the heterotrophic algae Crypthecodinium cohnii, using short-chain carboxylic acids derived from dark fermentation of food waste. The future potential of DHA from algae was evaluated by comparing the environmental impact to that of DHA from Peruvian anchovy oil. With respect to global warming, terrestrial acidification, freshwater eutrophication and land use, algae oil inferred -52 ton CO2eq, 3.5 ton SO2eq, -94 kg Peq, 2700 m2 eq, respectively per ton DHA. In comparison, the impact per ton DHA from fish oil was -15 ton CO2eq, 3.9 ton SO2eq, -97 kg Peq and 3200 m2 eq. Furthermore, algae oil showed lower climate impact compared to canola and linseed oil. By including Ecosystem damage as indicator for ecosystem quality at endpoint level, the important aspect of biodiversity impact was accounted for. Although the method primarily accounts for indirect effects on biodiversity, DHA from algae oil showed lower Ecosystem damage compared to fish oil even when future energy development, optimized production, increased energy demand and effects on biotic resources were considered via sensitivity analyses. As the results suggest, algae oil holds a promising potential for increased sustainability within aquaculture, provided that continued development and optimization of this emerging technology is enabled through active decision-making and purposeful investments.

Improving the sustainability of food supply chains through circular economy practices – a qualitative mapping approach

PurposeThe purpose of this paper is to present a methodological approach to support qualitative analysis of waste flows in food supply chains. The methodological framework introduced allows the identification of circular food waste flows that can maximise the sustainability of food supply chains.Design/methodology/approachFollowing a qualitative approach, circular economy perspectives are combined with core industrial ecology concepts in the specification of a standardised analytical method to map food waste flows and industrial synergies across a supply chain.FindingsThe mapped waste flows and industrial linkages depict two time-related scenarios: (1) current scenarios showing the status quo of existing food waste flows, and (2) future scenarios pointing out circular flows along the supply chain. The future scenarios inform potential alternatives to take waste flows up the food waste hierarchy.Research limitations/implicationsThe qualitative approach does not allow generalisations of findings out of the scope of the study. The framework is intended for providing focussed analysis, case by case. Future research involving mixed methods where quantitative approaches complement the qualitative perspectives of the framework would expand the analytical perspective.Originality/valueThe framework provides a relatively low-cost and pragmatic method to identify alternatives to minimise landfill disposals and improve the sustainability of food supply chains. Its phased methodology and standardised outcomes serve as a referential basis to inform not only comparative analysis, but also policymaking and strategic decisions aimed at transforming linear food supply chains into circular economy ecosystems.

Measuring Circularity in Food Supply Chain Using Life Cycle Assessment; Refining Oil from Olive Kernel.

Valorization of food waste is a potential strategy toward a circular food supply chain. In this regard, measuring the circularity of food waste valorization systems is highly important to better understand multiple environmental impacts. Therefore, this study investigated the circularity of a food waste valorization system (refining oil from olive kernel) using a life cycle assessment methodology. An inventory of an industrial-based olive kernel oil production system is also provided in this study. The system boundary was the cradle to the factory gate of the production system. The results indicated that natural gas consumption was the highest contributor to most of the investigated impact categories. The global warming potential of one kg of oil produced from olive kernel was calculated to be 1.37 kg CO2eq. Moreover, the calculated damages of 1 kg oil production from olive kernel to human health, ecosystem quality, and resource depletion were 5.29 × 10−7 DALY, 0.12 PDF∙m2∙yr., and 24.40 MJ, respectively.

Cutting edge technologies to end food waste

Cutting edge technologies to end food waste

Circular Food Behaviors: A Literature Review

Consumer behavior is crucial in the transition towards circular food systems. Studies so far investigate isolated circular food behaviors, but it is still unclear how the literature comprehensively addresses these behaviors. This paper provides an overview of the literature on circular food behaviors. Following a semi-systematic literature review, we analyze 46 papers related to circular food behaviors. We summarize their main features, categorize the behaviors, and propose a future research agenda. Results show the novelty and quick popularity of the topic, a dispersion across sustainability and agri-food journals, the manuscripts’ goals related to consumption, a predominance of empirical data collection in Europe, a focus on behaviors related to protein alternatives, food waste, and upcycled foods, and the importance of communication and consumers’ education. We categorize and characterize three types of circular food behaviors: linear, transitioning, and circular behaviors. Circular behaviors (i) are part of a systemic circular economy view, (ii) define consumers as “doers” or “prosumers”, (iii) pursue long-term sustainability goals, (iv) show a high engagement of skilled consumers, and (v) are supported by technologies. Future research should consider the social dimension of sustainability and pursue a systemic view of circular food behaviors. We suggest that a circular food-related lifestyle may incorporate the recommended directions.

Influence of substrate inclusion of quail manure on the growth performance, body composition, fatty acid and amino acid profiles of black soldier fly larvae (Hermetia illucens)

In recent years, monounsaturated fatty acids (MUFAs), especially palmitoleic acid (omega-7, POA) and oleic acid (omega-9, OA), have gained increasing notoriety; however, traditional sources of MUFAs have not achieved sustainability. Black soldier fly (BSF) larvae can convert low-quality products into high-quality biomass to be used in many industrial applications. Therefore, this study aims to assess increasing of quail manure on the biological traits of BSF larvae and the bioaccumulation of MUFAs by BSF larvae reared on quail manure, which causes many harmful effects to the environment. Different concentrations of quail manure from 0 to 100% were mixed with wheat bran. The inclusion of quail manure in the substrate resulted in (1) a decrease in saturated fatty acids by 20.20%, (2) accumulation of OA (47.36%), (3) biosynthesis of POA (157.73%) in BSF larvae, and (4) no significant differences in total protein (~38%) or essential amino acids (~43%) of BSF larvae. Inclusion of 40% of quail manure improved the performance of BSF larvae. Therefore, rearing BSF larvae on quail manure is considered to be a renewable and sustainable source of omega-7 and omega-9 for nutraceutical production, pharmaceutical uses, or animal food additives to achieve circular food production.

Life cycle assessment of a circular, urban mushroom farm

Modern food systems incur many environmental impacts, which can be mitigated by the application of circular economy principles, such as the closing of material and energy loops and the upcycling of waste products. Mushroom farming provides a relevant case in this direction because organic waste can be used for substrate as an input in the cultivation process, which produces valuable outputs such as edible foodstuffs and soil amendment. Few studies evaluate the actual environmental impacts of circular food production systems and assess their efficacy with respect to more linear alternatives. To address this research gap, we quantified the environmental impacts of a circular, urban mushroom farm next to Paris, France. We used life cycle assessment to study the production of 1 kg of fresh oyster mushrooms (Pleurotus ostreatus), from the generation of substrate materials through delivery to the distribution center. Our goals were to quantify the environmental impacts of a novel type of food production system, to find the aspects of production that contribute most to these impacts, and to assess the advantages and disadvantages of circular economy for this case study. In terms of climate change impact, the product system emitted 2.99e3.18 kg CO2-eq./kg mushroom, and on-farm energy use was the top contributor to all impact categories except land use. Surprisingly, 31% of the climate change impacts came from transport throughout the supply chain, despite the local nature of the farm. Circular economy actions helped optimize the environmental performance by minimizing impacts from the use of materials, which were mostly upcycled. This suggests that further improvements could be made by reducing energy consumption on the farm or by making the transport schemes more efficient, rather than continuing to focus on the type and source of materials used. This circular, urban farm had similar climate change impacts to classical, more linear systems, but these impacts could be largely reduced by implementing appropriate actions. These were identified and discussed with the farmers, factoring in their feasibility.

Use Them for What They Are Good at: Mealworms in Circular Food Systems.

Simple SummaryDifferent challenges exist, such as climate change and a growing number of people living on the planet, that put pressure on current and future food systems. In the future, more food must be produced on less land. At the same time, food-related greenhouse gas emissions must be reduced to be in line with the 2 °C climate goal, to limit potential risks of climate change. In this context, mealworms have been discussed as a sustainable and resource-efficient protein production option in circular food systems. They are an efficient biomass converter of low-quality by-products, such as wheat bran and brewer’s spent grain. In this article, we provide an overview of by-products that have been used in mealworm feeding trials. We quantify commonly available by-product types in Austria, and discuss potentials and limitations associated with mealworm farming. We found that further research is needed to better understand the strengths of mealworms in circular food systems, and several hurdles need to be addressed so that mealworm farming becomes more attractive in Western countries.Future food systems must provide more food produced on less land with fewer greenhouse gas emissions if the goal is to keep planetary boundaries within safe zones. The valorisation of agricultural and industrial by-products by insects is an increasingly investigated strategy, because it can help to address resource scarcities and related environmental issues. Thus, insects for food and feed have gained increasing attention as a sustainable protein production strategy in circular food systems lately. In this article, we provide an overview on by-products, which have already been fed to T. molitor (mealworms), a common edible insect species. In addition, we investigate other by-products in Austria, which can be suitable substrates for T. molitor farming. We also provide an overview and discuss different perspectives on T. molitor and link it with the circular economy concept. We identify several future research fields, such as more comprehensive feeding trials with other by-products, feeding trials with mealworms over several generations, and the development of a standardized framework for insect rearing trials. In addition, we argue that due to their ability to convert organic by-products from agricultural and industrial processes into biomass in an efficient way, T. molitor can contribute towards resource-efficient and circular food and feed production. However, several hurdles, such as legal frameworks, need to be adapted, and further research is needed to fully reap the benefits of mealworm farming.