Highly alkaline (i.e. bleach-like) wastes are produced in large quantities by various globally important industrial processes. For example, up to 180 million tonnes of slags are produced each year by the steel industry, while up to 120 million tonnes of bauxite processing residue (from aluminium refining) are generated globally. Traditionally, these wastes have simply been dumped into landfill sites, and pose significant environmental risks. For example, water percolating through the landfill to form "leachate" is toxic to aquatic life, and dust generated from landfill activity can pose public health hazards. On the other hand, these wastes can also provide potential resources we would like to recover. Global mineral and metal prices are high, and there is renewed interest in recovery of metals from any available source. This is particularly the case for those metals important for technological applications, such as vanadium for high grade steel manufacture and rare earth elements for "hi-tech" applications such as visual displays, computer memory and green technologies such as wind turbines and hybrid cars. The potential of highly alkaline waste for metal recovery is enormous; not only is waste produced in large amounts every day, but there is up to 100 years of "legacy" stockpiles in some areas. Unfortunately, the concentration of metals within the leachate is low, and recovering metals from it would be expensive. Directly digging up legacy sites is feasible, but is also expensive and would cause a lot of environmental disturbance. Recent ground-breaking work by the project team has shown that we can accelerate natural weathering processes of steel industry residues by covering it with compost. This concentrates metals like nickel and vanadium to recoverable concentrations in the leachate with almost no physical disturbance. Covering the waste material in compost will also reduce - potentially prevent - dust generation. The compost used in these experiments is "municipal organic waste" that is mostly put into landfill today, so the treatment can be done at almost no financial cost and with a knock-on environmental benefit. If this were not enough, the compost allows more dissolved CO2 to penetrate into the waste material where it reacts with the metals to form carbonate minerals. This is an important means of carbon sequestration, which will offset some of the emissions from the industry. Further deposition of carbonate minerals can be encouraged within the leachate itself once it reaches surface, sequestering even more carbon and consuming some of the low value metals in the leachate it would be worthwhile to recover. As ever, there remain considerable economic, legislative, environmental and social issues that need to be addressed to ensure the responsible development of this kind of industry as well as a range of scientific challenges we still need to address. R3AW aims to address these challenges by bringing together key commercial partners (e.g. steel, cement and alumina industries) with a multi-disciplinary team of environmental scientists, waste policy experts and experts in systems analysis and stakeholder engagement to pave the way to transform resource recovery and environmental remediation in the steel and cement industries and elsewhere. Our objectives for the project are: 1) Develop an interdisciplinary approach involving researchers and all other stakeholders to identify key scientific, economic and societal needs and questions surrounding resource recovery from caustic waste streams. 2) Undertake preliminary assessment of the accelerated leaching approach we are pioneering under field conditions in the UK. 3) Determine the critical scientific, industrial, societal and policy issues currently limiting application of this highly promising science in a manner that can be addressed in future government and industrially funded projects. 4) Develop full research proposals to address these questions.

Planet Earth is under severe stress due to imbalances in production, consumption, abuse and misuse of natural and man-made resources and, poor climate control. Our resources will be further stretched as global population increases from 7 billion today to over 9 billion by 2050. Industrialised nations are resource intensive societies heavily reliant of crude oil (petroleum) and gas for their energy, chemical and material needs based on traditional manufacturing processes. However, crude oil is a finite resource and its continued use represents a major environmental burden. Thus, development of new manufacturing processes and technologies based on alternative feedstocks, i.e., biobased and ideally produced as a waste or currently under-utilised, within the confines of a sustainable circular economy is of paramount importance nationally and globally. Food and drink is the largest manufacturing sector in the UK, employing approximately 400,000 people with a turnover of £76 billion. Food manufacturing is a complex process that is in the main linear- rather than circular-thinking. A staggering 9.9 million tonnes of food waste and food by-products are generated per year in the food industry alone, of which 56% is considered unavoidable. Unavoidable food supply chain wastes (UFSCW) lost after harvest and along the distribution and consumption chain have a dual negative environmental impact: undue pressure on natural resources and ecosystem services and pollution through food discards. However, current strategies for dealing with UFSCW are rudimentary and of low value: these include waste to energy (including incineration and anaerobic digestion), where possible; animal feed and bedding; compositing; ploughing back in to soil; and, least preferable, landfill. UFSCW is unique as a bioresource: this readily available biomass contains a treasure trove of unexploited, bio-based materials and chemicals, with a range of potential commercial applications. Our aim is to develop a whole 'systems' understanding of upgrading and re-utilisation of unavoidable food supply chain wastes, [namely: brewers' spent grain; pea vine waste; out of specification citrus fruits; and out of specification potatoes], as a source of functional food ingredients. These four feedstocks are representative examples such that our methodologies and findings will be applicable to a wider range of feedstocks. Furthermore, key performance indicators such as amount of waste, pattern of generation, possible contamination with other food waste, seasonality, etc. will be used to develop an appropriate whole system thinking around food waste collection, reprocessing, and production of new food products. The ultimate objective of our proposed research is to achieve a whole systems thinking "closed-loop" manufacturing of food products, with all input materials fully utilised. The ramifications and any unintended consequences associated with the proposed alternatives will be assessed, at an industry level, working with previously identified partners, and within a broader scope, determining the consequences of these changes in the entire UK food manufacturing sector, linking into the work of the highly networked EPSRC Centre for Innovative Manufacturing in Food.

Over half a billion tonnes of alkaline (i.e. bleach-like) wastes are produced globally each year by industries such as steel production, alumina refining and coal-fired power generation. These wastes are currently stored in piles or landfill and can pose serious environmental hazards. Water that filters through the waste is toxic to aquatic life and dust generated as it is moved and stored is a public health hazard. It can take decades for these risks to fade. On the other hand, alkaline wastes contain large quantities of materials we would like to recover for re-use, particularly metals important to the technologies of the future, such as vanadium, used in steel manufacture for offshore wind turbines, lithium and cobalt for vehicle fuel cells and rare earth elements crucial for next-generation solar power systems. The obvious solution: using the profits from recovering resources locked in the waste to pay for remediation of the pollution, is hampered by the environmental damage caused by digging up stored waste piles and the expense of extracting the metals from the waste using existing technology. Ground-breaking pilot research recently conducted by the team proposing this project shows that harnessing the power of low-cost, low-energy natural processes could solve the problem. We are developing a unique 'biomining' approach to increase the rate at which resources stored in the waste dissolve into water passing through it. Our pilot tests have shown that covering the waste pile with a layer of 'solid municipal waste' (compost) is very effective in driving this process. As water flows through waste treated with compost, metals like vanadium leach out to levels over twice those of untreated piles. The metal solution then flows out of the bottom of the waste pile under gravity. The high concentrations mean that extracting metals from this solution becomes viable using existing technology which we propose to implement as part of this project. In effect the valuable resources are extracted without digging up the waste. The resource recovery benefits are matched by benefits to the environment. The layer of compost reduces dust generation from the site, and allows more CO2 to penetrate into the pile where it is locked away in significant quantities by reacting to form solid carbonate minerals. As elements like vanadium are pollutants as well as resources, recovery will eliminate the pollution alkaline waste weathering causes. Furthermore, the weathered waste piles have ideal conditions for nationally-scarce, orchid-rich plant communities to become established, making them suitable for restoration to create habitat of high conservation value. In order to turn the extremely promising results of our pilot studies into optimised, industry-ready processes we must better understand the specific mechanisms which control the biomining and develop a road map for negotiating the economic, legislative, environmental and societal challenges to the implementation of a new technology in an established industry with strict requirements for environmental protection. Our proposed research will tackle both these aspects in parallel. The combined package: recovery of the metal resources while suppressing dust, increasing carbon sequestration and treating the pollution caused, would be hugely beneficial to partners in our project from both industry (Tata Steel, Rio Tinto and the Minerals Industry Research Organisation) and environmental protection (Environment Agency). The project will bring together key commercial partners with a multi-disciplinary team of environmental scientists, waste policy experts and specialists in systems analysis and stakeholder engagement to pave the way for transforming resource recovery and environmental remediation. This team will investigate the key obstacles to this transformation and identify potential remedies, such as lobbying for legislative change or making a clear business case for resource recovery.

Our modern industrial society produces increasing amounts of waste. Yet many of these wastes might either contain useful materials (perhaps metals or nutrients) or could themselves be used as an input for another process (maybe as a fuel or raw material). Recovering these resources from wastes is an important part of waste management and normally involves collecting wastes from an industrial process, organisation or community and then carrying out sorting, reprocessing, recycling or incineration. All these activities have benefits and impacts in many different ways, for example: * the economy: benefits come from selling the recovered materials, while the impacts are the costs of collection, processing etc; * our society: providing reprocessing jobs is a benefit, at the cost of harsh rules on rubbish collection; * the environment: preventing harmful materials from being dumped helps the environment, but reprocessing may involve carbon emissions or use of more resources; * our health: keeping the streets clean prevents disease, but some recycling jobs may be dangerous. When choosing which resource recovery system is best, it is difficult to weigh up all these factors. Often, we simply 'bolt on' a piece of technology to the end of the process, worrying mainly whether it is cost-effective and often assuming that because we are recovering resources, the environmental impact is automatically good. But many recovery systems have 'hidden' impacts that require complex analysis to untangle. Studies have shown that in some cases, collection and recycling of plastic bottles produces more carbon dioxide and uses more resources than simply making new bottles; a hidden environmental impact. In fact, much of our plastic waste is exported to the Far East, where it is reprocessed by workers in unhealthy conditions paid very poor wages; a hidden social and health impact. Until we have a method for weighing up all these factors, poor decisions driven by faith in simplistic ideas such as 'the waste heirarchy' will continue to be made. In the C-VORR project, we will bring together scientists, engineers, mathematicians and economists to help build this method. Working with our industry partners and international experts, we will look at processes that produce waste; not just at the 'end of the pipe' , but upstream and downstream throughout the whole system. We will examine the flows of materials through these systems and see how their 'complex value' - the balance of their economic, social, environmental and health benefits and impacts - changes as we adjust the system. This will allow us to identify the adjustments - perhaps a change in the way a product is made, or a new recycling process, or using the waste from one system as the input to another - that give us the best value overall; not just in terms of money, but also in terms of the effect on our health, happiness and environment. To do this, we will need to combine scientific and engineering methods that measure flows with ways of measuring benefits and impacts, checking how these vary with time and space. We will have to completely redefine value, using unorthodox economic thinking to help us. If we get this right, then we can completely change the way that we look at recovering resource from waste, and instead talk about preventing value from being dissipated into waste in the first place. We will have a tool that will not only let us decide which recovery technology - or change to the process - is best for society and the environment, but that can also identify business opportunities to recover previous hidden value. It will allow us to move away from simplistic ideas about recycling and reprocessing that may have unintended consequences, and give us all a more sophisticated understanding of how to best preserve our scarce resources, our precious environment and the quality of not just our lives but those connected to us; in this globalised world, that's everyone.