Publications
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Abstract
Most food manufacturers in industrialised countries produce significant amounts of food waste during their manufacturing activities. Due to the serious environmental consequences of managing these materials, environmental impact analyses have become popular to identify more sustainable practices for food waste management. Life-Cycle Assessment (LCA) is a useful methodology to assess such environmental impacts. This paper presents the main results obtained using the LCA methodology to analyse the potential environmental impacts of waste management for a brewery in the UK. Initially, the main waste types are identified for this industry: barley straw, malt waste and spent grain, and then barley straw is selected to study its environemental impact in detail. An alternative, more sustainable way to manage barley straw by extracting its wax with supercritical CO2 is discussed. SimaPro software is used to both quantify potential environmental impacts and evaluate the overall environmental performance of this valorisation opportunity, and to compare its modelled environmental impacts to the current impacts of managing barley straw. Results show that valorising barley straw by this method generates a high environmental impact due to the energy requirements of the processes involved, principally for human toxicity (cancer effects), human toxicity (non-cancer effects) and freshwater ecotoxicity impact categories. Using more energy-efficient processes or an alternative energy source would reduce this environmental impact. The analysis used in this paper allows an objective comparison between different scenarios with the final aim of supporting the use of sustainable solutions for waste management in the food industry.
SMART authors: Shahin Rahimifard , Guillermo García García
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Abstract
Food waste is a significant contemporary issue in the UK, with substantial environmental, social and economic costs to the nation. Whilst efforts to reduce food waste are laudable, a significant proportion of food and drink manufacturer waste is unavoidable. On the one hand, there is a drive from industry to reclaim as much value from this waste as possible, for example, by conversion to valuable products in what is known as 'valorisation'. At the same time, growing social and legislative pressures mean that any attempts to valorise food waste must be performed in a sustainable manner. However, for every company and its specific food wastes, there will be multiple valorisation possibilities and few tools exist that allow food and drink manufacturers to identify which is most profitable and sustainable for them. Such a decision would need to not only consider environmental, social and economic performance, but also how ready that technology is and how well it aligns with that company's strategy. In response, this paper develops and presents a hybrid framework that guides a company in modelling the volumes/seasonality of its wastes, identifying potential valorisation options and selecting appropriate indicators for environmental, social and economic performance as well as technological maturity and alignment with company goals. The framework guides users in analyzing economic and environmental performance using Cost-Benefit Analysis and Life Cycle Assessment respectively. The results can then be ranked alongside those for social performance, technological maturity and alignment with company goals using a weighted sum model variant of Multi-Criteria Decision Analysis to facilitate easy weighted sum model variant of Multi-Criteria Decision Analysis to facilitate easy visual comparison. This framework is demonstrated in the form of a case study with a major UK fruit consolidator to identify the optimal strategy for managing their citrus waste. Possibilities identified included sale of imperfect but still edible waste via wholesale at a significantly reduced profit and the investment in facilities to extract higher value pectin from the same waste stream using a microwave assisted pectin extraction process. Results suggest that continued sale of waste to wholesale markets is currently the most beneficial in terms of economic viability and environmental performance, but that in the medium to long term, the projected growth in the market for pectin suggests this could become the most viable strategy.
SMART authors: Shahin Rahimifard , Guillermo García García
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Abstract
Due to large quantities of food waste generated by manufacturers and the associated environmental impact of these waste streams, improving food waste can be complex and the most appropriate methods may not always be selected. There are a range of aspects to consider in order to select the most sustainable option to manage food waste, such as the specific type of food waste generated, characteristics of food companies that generate food waste, features of the management processors that will manage it, and the sustainability implications of dealing with the food waste. To support food waste management decision making, this paper presents a modelling procedure to assist in identifying what type and range of information is needed to model food waste management systems, allowing the user to follow a systematic methodology to make more informed decision. This procudure is based on the identification and analysis of qualitative and quanititative attributes necessary to model food waste management and an assessment of their relationships. Speciically, it describes a process to ensure that all relevant attributes are considered during the decision-making process. A case study with a large UK food and drink manufacturer is used to demonstrate the applicability and usefulness of this procedure. In conclusion, the systematic procedure presented in this paper provides a metholodgy to identify opportunities to improve the sustainability of industrial food waste management. The data obtained can be used to further undertake a life-cycle assessment study and/or to apply existing socio-economic methologies to thoroughly assess impacts and benefits of food waste management.
SMART authors: Shahin Rahimifard , Guillermo García García
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Abstract
Food manufacturing is comprised of a number of complex processes which generate vast amounts of food waste. Frequently, strategies for dealing with these materials are rudimentary and provide a low economic and environmental value, for instance animal feeding, anaerobic digestion, composting, incineration, landspreading and landfilling. However, food wastes contain numerous chemicals with a wide range of potential commercial applications, which makes these materials suitable feedstocks for valorisation. This paper applies a Waste Flow Modelling methodology to achieve two aims: to provide valuable food manufacturing and waste data in order to better understand current food manufacturing activities, and to analyse existing food waste management practices to lay the foundation for the implementation of alternative food waste valorsiation solutions. Four UK industrial companies have been selected and assessed to represent four different food sectors where food waste valorisation could provide an economic and/or environmental advantage: a fruits supplier, a brewery, a potato supplier and a producer of peas. The production line of each of these four businesses is defined and characterised, which allows the identification of food wastes generated. Next, food wastes are categorised and quantified, and their patterns of generation and current waste management practices are described. Sankey diagrams and performance indicators are used to assess the efficiency of processes, combination of processes and the complete production line in terms of food waste generation. Finally, the results are analysed and used to obtain the main conclusions and provide recommendations for an improved food waste management system, with a focus on valorisation opportunities.
SMART authors: Shahin Rahimifard , Guillermo García García
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Abstract
The first Life-Cycle Assessment (LCA) of an acid-free, microwave-assisted process for pectin production at pilot scale is reported. The properties of the resulting pectin were measured and compared against the criteria for commercial pectin, while the energy consumption of the microwave process was measured to compare its life cycle impacts with that of the current commercial process. Overall, the pectin met all the criteria for food-grade commercial pectin. The microwave unit was estimated to have <25% of the environmental impact of traditional acid-assisted thermal process in all categories measured and provided an improved yield of 5% (wet weight basis) compared to 3% by thermal heating under normalized conditions. The readouts were comparable with each other over three runs indicating a robust and reproducible process, crucial for scale-up purposes. With the product meeting the relevant criteria and the process being robust and more environmentally friendly, this work demonstrates the practical and commercial potential of microwave technology to succeed conventional acid-based extraction of pectin production.
SMART authors: Shahin Rahimifard , Guillermo García García
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Abstract
One of the most prominent challenges commonly acknowledged by modern manufacturing industries is ‘how to produce more with fewer resources?’ Nowhere is this more true than in the food sector due to the recent concerns regarding the long-term availability and security of food products. The unique attributes of food products such as the need for fresh perishable ingredients, health risks associated with inappropriate production environment, stringent storage and distributions requirements together with relatively short post-production shelf-life makes their preparation, production and supply considerably different to other manufactured goods. Furthermore, the impacts of climate change on our ability to produce food, the rapidly increasing global population, as well as changes in demand and dietary behaviours both within developed and developing countries urgently demands a need to change the way we grow, manufacture and consume our food products. This paper discusses a number of key research challenges facing modern food manufacturers, including improved productivity using fewer resources, valorisation of food waste, improving the resilience of food supply chains, localisation of food production, and utilisation of new sustainable sources of nutrition for provision of customised food products.
Link to Loughborough University Repository:
https://dspace.lboro.ac.uk/2134/24925
SMART authors: Shahin Rahimifard , Guillermo García García , Jamie Stone , Patrick Webb , Aicha Jellil , Sandeep Jagtap , Pedro Gimenez-Escalante
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Abstract
Global levels of food waste are attracting growing concern and require immediate action to mitigate their negative ecological and socio-economic ramifications. In the developed world, of the order of 20-40% of food waste is generated at the manufacturing stage of supply chains and is often managed in non-optimised ways leading to additional environmental impacts. This research describes a novel decision-support tool to enable food manufacturers to evaluate a range of waste management options and identify the most sustainable solution. A nine-stage qualitative evaluation tool is used in conjunction with a number of quantitative parameters to assess industrial food waste, which is then used to generate performance factors that enable the evaluation of economic, environmental and social implications of a range of food-waste management alternatives. The applicability of this process in a software-based decision-support tool is discussed in the context of two industrial case studies.
Link to Loughborough University Institutional Repository:
https://dspace.lboro.ac.uk/dspace-jspui/handle/2134/23785
SMART authors: Shahin Rahimifard , Guillermo García García
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Abstract
Globally, one third of food produced is wasted. In the UK, 47% of the food waste is post-consumer revealing a need to encourage more efficient consumption. This research asserts that manufacturers and retailers can play a crucial role in minimising consumer food waste (CFW) through consumer engagement and provision of smart solutions that ensure more efficient use of food products. Supporting manufacturers and retailers to minimise CFW can be achieved via two stages: a) understanding and evaluating CFW, and b) identifying improvements to manufacturing and retail activities that would reduce CFW. Onsite waste audits have identified that the percentage of edible CFW from domestic environments (77%) is greater than that disposed of in public areas (14%) supporting the hypothesis that improving the full food provisioning process (e.g. packaging, storage, guidance) would be beneficial. This paper proposes a number of mechanisms to support manufacturing and retail in reducing CFW.
Link to Loughborough University Repository:
https://dspace.lboro.ac.uk/2134/22780
SMART authors: Shahin Rahimifard , Guillermo García García , Aicha Jellil
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Abstract
DOI 10.1007/s12649-016-9720-0
As much as one-third of the food intentionally grown for human consumption is never consumed and is therefore wasted, with significant environmental, social and economic ramifications. An increasing number of publications in this area currently consider different aspects of this critical issue, and generally focus on proactive approaches to reduce food waste, or reactive solutions for more efficient waste management. In this context, this paper takes a holistic approach with the aim of achieving a better understanding of the different types of food waste, and using this knowledge to support informed decisions for more sustainable management of food waste. With this aim, existing food waste categorizations are reviewed and their usefulness are analysed. A systematic methodology to identify types of food waste through a nine-stage categorization is used in conjunction with a version of the waste hierarchy applied to food products. For each type of food waste characterized, a set of waste management alternatives are suggested in order to minimize environmental impacts and maximize social and economic benefits. This decision-support process is demonstrated for two case studies from the UK food manufacturing sector. As a result, types of food waste which could be managed in a more sustainable manner are identified and recommendations are given. The applicability of the categorisation process for industrial food waste management is discussed.
Link to Loughborough University Institutional Repository:
https://dspace.lboro.ac.uk/dspace-jspui/handle/2134/22695
SMART authors: Shahin Rahimifard , Guillermo García García
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Abstract
In this paper, we demonstrate the functionality and functionalisation of waste particles as an emulsifier for oil-in-water (o/w) and water-in-oil (w/o) emulsions. Ground coffee waste was chosen as a candidate waste material due to its naturally high content of lignin, a chemical component imparting emulsifying ability. The waste coffee particles readily stabilised o/w emulsions and following hydrothermal treatment adapted from the bioenergy field they also stabilised w/o emulsions. The hydrothermal treatment relocated the lignin component of the cell walls within the coffee particles onto the particle surface thereby increasing the surface hydrophobicity of the particles as demonstrated by an emulsion assay. Emulsion droplet sizes were comparable to those found in processed foods in the case of hydrophilic waste coffee particles stabilizing o/w emulsions. These emulsions were stable against coalescence for at least 12 weeks, flocculated but stable against coalescence in shear and stable to pasteurisation conditions (10 min at 80 °C). Emulsion droplet size was also insensitive to pH of the aqueous phase during preparation (pH 3–pH 9). Stable against coalescence, the water droplets in w/o emulsions prepared with hydrothermally treated waste coffee particles were considerably larger and microscopic examination showed evidence of arrested coalescence indicative of particle jamming at the surface of the emulsion droplets. Refinement of the hydrothermal treatment and broadening out to other lignin-rich plant or plant based food waste material are promising routes to bring closer the development of commercially relevant lignin based food Pickering particles applicable to emulsion based processed foods ranging from fat continuous spreads and fillings to salad dressings.
Link to Loughborough University Institutional Repository:
https://dspace.lboro.ac.uk/dspace-jspui/handle/2134/22731
SMART authors: Guillermo García García
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Abstract
The ability to feed 9 billion people by 2050 will rely on processed foods being delivered through complex and dispersed international supply chains. Currently as much as a third of all food grown is lost as waste at various points along existing supply chains, with roughly half of food waste in the developed world occurring after purchase by the end consumer. For the long-term resilience of the food industry, and as holders of critical information, manufacturers need to play a part in reducing this waste. Using a novel method of food waste categorization, this research describes how the prevention of food waste for certain categories can be facilitated using a Smart Phone App that enables industrial inventory management for the domestic environment, providing the consumer with supporting information about food condition and appropriate preparation processes. Data availability issues and the benefits in terms of resource efficiency and consumer loyalty are discussed.
Link to Loughborough University Institutional Repository:
https://dspace.lboro.ac.uk/2134/19396
SMART authors: Shahin Rahimifard , Guillermo García García
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Abstract
A considerable amount of waste is generated in the food supply chains of both developing and developed countries. In an increasingly resource constrained world, it is imperative to reduce the high environmental, social and economic impacts associated with this type of waste. This necessitates the development and implementation of improved, targeted management practices. This paper discusses the various definitions and categorizations of food waste according to different international organizations, reviews the most up-to-date data on waste generated in the food supply chains as well as its environmental impact and assess the applicability of current waste management options. This analysis provides the basis for the development of a framework for increasing the effectiveness of food waste management practices through structured assessment and better informed selection of waste management methodologies for each food waste category. The usability of this novel framework is discussed.
Link to Loughborough University Institutional Repository:
https://dspace.lboro.ac.uk/dspace-jspui/handle/2134/18195
SMART authors: Shahin Rahimifard , Guillermo García García