Over recent years, the issue of how to manage waste sustainably has intensified for both researchers and policy makers. From a policy perspective, the reason for this intensification can be traced to European legislation and its transposition into UK policy. The Welsh Government in particular has set challenging statutory targets for Local Authorities. Such targets include increases in recycling and composting as well as waste reduction and reuse targets. From a research perspective there has been dissatisfaction with behavioural models and their willingness to explore alternative social science thinking (such as leading approaches to practice). Despite policy interest in sustainable waste practices, there remains little research which focuses specifically on waste minimisation at the individual or household level. What research exists focuses on pro-environmental or recycling behaviour, and tends to focus upon values, intention and behavioural change, rather than on what actual practices occur, and for what reasons. This research focuses on what practices take place in order to access a more complex range of reasons why such practices take place. The methodology adopts a qualitative approach to uncovering practices in a variety of contexts, and discovers a number of key insights which underpin waste minimisation practice. This thesis demonstrates that waste minimisation performances take place, but often do so ‘unwittingly’. Coupled to this, many witting or unwitting waste minimisation actions occur for reasons other than concern for the environment. Furthermore, this research suggests that practices (and their motivations) vary dependent upon the context in which they occur. In general, three key themes were found to be significant in influencing the take up and transfer of practice: cost, convenience, and community. As a waste practitioner, the researcher is able to engage with these themes in order to suggest future directions for waste minimisation policy as well as research.

The management of radioactive wastes is a significant environmental issue facing the international nuclear community today. The current international consensus is for disposal of higher activity waste from a variety of sources in deep geological disposal facilities (GDFs). Hydraulic seals, often planned to consist of compacted bentonite-sand blocks, are an important part of the closure phase of a GDF. As such, an understanding of the hydro-mechanical (HM) behaviour of these seals, and the ability to model and predict their behaviour is fundamental to support many planned safety cases and licence applications. Bentonite is well suited for use as a hydraulic seal due to its high swelling capacity that enables it to swell into voids while maintaining a low permeability sealed barrier to advective flow, and to provide structural support by generating a swelling pressure on the excavation walls. The hydro-mechanical process of bentonite hydration is a highly non-linear problem. As such, coupled process models that are able to account for the strong inter-dependence of the hydraulic and mechanical processes are employed to simulate the behaviour of bentonite under repository conditions. This thesis reports the development of an HM coupled model in the open source finite element code OpenGeoSys (OGS), and its application to the simulation of a range of hydraulic seal test conditions. The developed model couples Richards’ equation for unsaturated flow to a new strain dependent non-linear elastic mechanical model that incorporates a Lagrangian moving finite element mesh to inform the material non-linearity. Stress and volumetric dependent water retention behaviour are incorporated through the implementation of the Dueck suction concept extended to take into account non-recoverable strains during consolidation. A number of permeability functions are implemented and tested against experimental data. The mechanical model is extended to account for wetting-induced collapse behaviour by the definition of a failure curve derived from experimental results. Similar in definition to the Loading-Collapse curve in elasto-plastic models, this failure curve triggers the application of a source term to account for wetting-induced collapse. Coupling between the hydraulic and mechanical processes is achieved through the stress dependency of the water retention behaviour, the inclusion of a new coupling factor for the hydraulic contribution to the mechanical process, and the dependency of numerical convergence criteria on net mean stress. An explicit iterative calculation approach is employed. As a result, the hydraulic and mechanical moving meshes are decoupled to allow volumetric dependent parameters to be updated within process iterations. The model is calibrated and compared to experimental data from the SEALEX experiments conducted by the Institut de Radioprotection et de S ˆ uret´e Nucl´eaire (IRSN) at the Tournemire URL, France. The experimental programme comprises standardised laboratory tests, a 1/10th scale mock-up of a hydraulic seal with a uniform technological void, and a full scale in situ performance test with a non-uniform technological void due to its horizontal geometry. Using a model with 5 hydraulic parameters, 8 mechanical parameters with an experimentally defined failure curve, and one coupling parameter, the major trends of behaviour in all the SEALEX experiments can be recreated, including axial stress build up, water uptake, and final deformation. However, the elastic method employed leads to an over prediction of the rebound on loss of axial confinement in the 1/10th scale mock-up test. Simulations suggest that the non-symmetric technological void in the full scale performance test could have lasting effects on the development of heterogeneity in the hydraulic seal. The development of heterogeneity does not adversely affect the permeability with respect to the design criteria, but may have significant consequences for the development of a heterogeneous swelling pressure.

The Kingdom of Saudi Arabia is the largest country in the golf states and one of the richest oil producing countries. Saudi population is nearly 27million; in addition, Saudi Arabia receives millions of people from around the world for Islamic pilgrimages. Moreover, Saudi is hosting hundreds of thousands of international professionals and labourers. Hence, the country infrastructure and services have been in the top agenda to be modernized in order to cope with new demand for better quality of life for a rich country. The healthcare sector is one of the key sectors which requires a special on going attention, particularly medically generated waste. Therefore, this research work has been conducted to investigate the status of medical waste management in the capital city; Riyadh. The prime aim of this research work is to propose a strategic framework which can be used as a roadmap for the different stakeholders. This will contribute to the enforcement of better handling and treatment of medical waste and more importantly prevent and control the spread of diseases or harm might be caused by poor handling of medical waste. The aim of the research has been achieved through; the critical review and analysis of the relevant literature, which has revealed the noticeable gap and lack of scientific studies of the proposed field. Appropriately, the findings of the research has contributed to filling the gap of the knowledge as well as serving as a milestone for further research work in this very important field. By surveying Riyadh’s hospitals and other national and international reports has. This allowed the presentation of the facts and indications of the current status of medical waste in Riyadh City. To obtain in-depth knowledge and gather the important findings concerning the medical waste management, focused; interviews of different medical professionals from various hospitals were conducted. This research has revealed more important factors that need to be addressed. These findings were used to propose the framework, which has been formed to enable resolving the challenges of the integration, of the awareness element though Islamic principles, within the Saudi system. The proposed framework has been evaluated by committee of medical professionals and has been accepted as good roadmap and appropriate solution that address the main aim of this research work. Finally, the research work is just a step towards the establishment of a proper biomedical waste management system in the Kingdom of Saudi Arabia. Some recommendations for future implementation are suggested at the end of this thesis.

Microorganisms control many processes pertinent to the stability of radwaste inventories in nuclear storage and disposal facilities. Furthermore, numerous subsurface bacteria, such as Shewanella spp. have the ability to couple the oxidation of organic matter to the reduction of a range of metals, anions and radionuclides, thus providing the potential for the use of such versatile species in the bioremediation of radionuclide contaminated land. However, the organisms promoting these processes will likely be subject to significant radiation doses. Hence, the impact of acute doses of ionizing radiation on the physiological status of a key Fe(III)-reducing organism, Shewanella oneidensis, was assessed. FT-IR spectroscopy and MALDI-TOF-MS suggested that the metabolic response to radiation is underpinned by alterations to proteins and lipids. Multivariate statistical analysis indicated that the phenotypic response was somewhat predictable although dependent upon radiation dose and stage of recovery. In addition to the cellular environment, the impact of radiation on the extracellular environment was also assessed. Gamma radiation activated ferrihydrite and the usually recalcitrant hematite for reduction by S. oneidensis. TEM, SAED and Mössbauer spectroscopy revealed that this was a result of radiation induced changes to crystallinity. Despite these observations, environments exposed to radiation fluxes will be much more complex, with a range of electron acceptors, electron donors and a diverse microbial community. In addition, environmental dose rates will be much lower than those used in previous experiments. Sediment microcosms irradiated over a two month period at chronic dose rates exhibited enhanced Fe(III)-reduction despite receiving potentially lethal doses. The microbial ecology was probed throughout irradiations using pyrosequencing to reveal significant shifts in the microbial communities, dependent on dose and availability of organic electron donors. The radiation tolerance of an algal contaminant of a spent nuclear fuel pond was also assessed. FT-IR spectroscopy revealed a resistant phenotype of Haematococcus pluvialis, whose metabolism may be protected by the radiation induced production of an astaxanthin carotenoid. The experiments of this thesis provide evidence for a range of impacts of ionizing radiation on microorganisms, including the potential for radiation to provide the basis for novel ecosystems. These results have important implications to the long-term storage of nuclear waste and the geomicrobiology of nuclear environments.

The work reported involves the evaluation of technologies and management systems applied to Municipal Solid Waste (MSW). The study focuses on Mexico City, which with a population of approximately 9 million inhabitants and an estimated daily generation of 13,000 tonnes of waste, is encountering extreme waste management issues. The structures and public policies designed to provide waste management services have proved inadequate in relation to high rates of population growth and intensive business activities. The significant increase in demand has led the government of Mexico City to base public services on rudimentary techniques using obsolete equipment. The research approaches the problem through the analysis of several different aspects: (1) a comprehensive literature review of waste management including technologies and legal frameworks; (2) a general overview of the main demographic, geographic and economic aspects of Mexico City; (3) an extensive analysis of historic and future waste generation profiles and composition of waste in Mexico City; (4) an evaluation of the current status of the waste management system, including programmes, plans, facilities and infrastructure; and (5) a comparative study of the waste management system of Mexico City and the systems of selected international cities. The evaluation resulted in the identification of the following significant issues: (1) limitations in legislation related to waste management and environmental laws; (2) high population growth and increasing business activity, which contribute escalating generation of MSW; (3) ineffective public policies focused on waste management; (4) significant gaps in low levels of recycling activities; (5) obsolescence of equipment, infrastructure and facilities; (6) lack of diversification in treatment methods for MSW; and (7) failure to exploit market opportunities in the waste management sector. In addition to the evaluation of the system in Mexico City, the analysis of waste management systems in selected international cities allowed the author to identify key factors in order to develop integrated proposals. The analysis highlighted significant aspects including: legal frameworks, the participation of the private sector, waste hierarchy, and guiding principles for plans and programmes. The information enabled the design of a proposed development plan of a comprehensive waste management system in Mexico City through two main proposals. Firstly, an integrated programme for waste management in Mexico City was developed to provide feasible long-term strategies in the field of waste management. The specific objectives, goals, actions, responsibilities and time scales were defined in order to provide concrete activities under specific fields of operation. Secondly, a project to obtain funding for technology transfer structured according to technical, market and economic studies, was elaborated. The guide is aimed to exemplify an investment project through the analysis of a feasibility study related to generation of energy from biogas in a controlled landfill in Mexico City. The process may be adapted to the acquisition of technology in different sectors of the waste management process.

The Environment Agency are responsible for the regulation of radioactive substances in England, which is a highly controversial area to regulate due to the public perception regarding the associated environmental and health impacts. This is further complicated by the Environment Agency’s primary aim of contributing towards sustainable development, which is another controversial and contested concept. The principles of good regulation require a proportionate approach, which can be considered a key component of sustainable development also. However, published literature asserts that the regulation of radioactive discharges is disproportionate, which lacks verifiable data on the regulatory compliance costs and impacts imposed. This also implies that the regulation may not contribute towards sustainable development, which is compounded by the ambiguity of this requirement in the regulatory framework. This thesis therefore seeks to evaluate whether the Environment Agency is achieving its primary aim of contributing towards sustainable development in its regulation of radioactive discharges. To this end, this study sought to identify the interpretation of sustainable development that the law, policy and guidance for the regulation of radioactive discharges requires the Environment Agency to adhere to, and then collect data to assess whether this is being implemented. To achieve this, the law, policy and guidance for the regulation of radioactive discharges has been mapped on to an enhanced sliding-scale of sustainable development interpretations. This has revealed that the regulatory framework drives the Environment Agency to adhere to the newly developed interpretation of stronger sustainability, which requires a proportionate approach to be applied within the limitations of the environment. The regulation applied to Sellafield’s radioactive discharges has then been assessed against this stronger sustainability paradigm. The data collected confirms discharges are within environmental limits and that the regulation has resulted in direct compliance costs of £120 million between 2002 and 2009 without yielding any benefit to the environment in terms of a reduction in collective dose. The measured costs and benefits have been supplemented by a qualitative analysis of impacts that cannot be quantified, and these reinforce the contention that the regulatory approach at Sellafield is disproportionate and therefore inconsistent with stronger sustainability. A likely cause of the disproportionate regulatory approach is attributed to stakeholder and political pressures. Improvements have been proposed to address the disproportionate approach, which have already influenced the removal of some discharge limitations.

Few environmental problems exemplify market-failure better than municipal solid waste does: A direct by-product of economic production and consumption, its collection and disposal (still mainly at landfills, in many countries) incurs high capital and running costs, creates environmental and health impacts and, in European Union countries, risks incurring heavy financial penalties. The main remedy proposed in environmental economics is a marginal tax on the disposal of mixed household waste, intended to incentivise its reduction and separation for recycling. But taxes are politically unpopular, expensive to administer and generate variable response − sometimes stimulating illegal disposal of waste instead of its reduction. Taxes also risk undermining the moral benefits people seem to enjoy from cooperating voluntarily. Inducing voluntary cooperation could cultivate moral motives and generate cooperation, but this has received less attention in environmental economics to date. The aim of this thesis is to examine the determinants of cooperation by households in waste management activities, investigating the role that government policy can play in stimulating it, and focusing on the role of price incentives and of scheme promotion. Chapter 1 introduces the issue of waste management as an economic problem, and the role of household cooperation as a promising solution. Chapter 2 surveys the literature on the topic of what determines household cooperation in waste management and identifies the key gaps which the thesis seeks to address. Three manuscripts are presented in Chapters 3, 4 and 5, each of which examines a distinct question on the determinants of household cooperation in waste management. Chapter 6 concludes with a synthesis of main findings, key policy cues and suggestions for future research. The first manuscript titled “Voluntary recycling despite financial disincentives” employs a unique merged panel data set (n = 4,644) using data from 58 localities over 86 weeks to assess the determinants of participation in a voluntary waste separation scheme in Malta. The two manuscripts that follow are based on a nationally-representative telephone survey (n = 1,037), containing two embedded experiments, and conducted during 2013, in Malta, for this thesis. Manuscript 2 titled “Partisanship, priming and participation in voluntary recycling” tests whether party identification, as distinct from environmental or political ideology, can act as a determinant of participation in a recycling scheme, particularly if the scheme is promoted in a manner that associates it with the party in government. Manuscript 3 titled “The impact of a Pay as You Throw tax level and label on home-composting” examines the potential of a Pay As You Throw (PAYT) tax, and of its labelling, to induce substitution of biodegradable waste away from mixed kerb-side disposal and into home-composting. It also examines the prospect that this type of intervention stimulates illegal disposal. Synthesising the results of three studies, the thesis finds that: 1. The type of households most likely to cooperate in waste management schemes are multiple-person ones facing lower constraints of space and time, where members hold pro-environmental preferences. This confirms findings of similar studies in other contexts, helps forecast uptake and may guide the design and promotion of schemes to target low-lying fruit and tackle relevant constraints. 2. Driven mainly by moral motives, households are willing to recycle voluntarily even if it is less convenientc e than disposing of un-separated waste, and they are willing to pay for it. This is a useful finding for municipalities with low budgets, unable to institute taxes or fearing illegal disposal as a reaction. 3. Political preferences are relevant to recycling: Where negative sentiment towards the party in government exists, (even subtle cues) promoting the scheme as a government scheme and associating it with the party in government can suppress participation. Decoupling political communication from scheme promotion can release more households into cooperative effort. 4. Responses to waste taxes are not just a matter of price level but also of tax salience: A tax label can significantly increase waste separation and home-composting but it also boosts higher illegal-disposal intent. The way a fee is labelled therefore itself forms part of the intervention tool-kit, meriting pre-testing and capable of manipulation. These findings make a marginal contribution to gaps in the environmental economics literature by integrating insights from psychology. They are also intended to offer simple and applicable ideas to policy-makers and to scheme-operators aiming to increase household cooperation in waste management.

This thesis examines the regional electronic and electrical waste (e-waste) recycling network in Malaysia and Singapore, with a secondary focus on the articulations of informal labour within the network. I argue that there is a need to theorise production networks post-consumption; i.e. to focus on the activities and processes that occur after a commodity is consumed and subsequently discarded. I argue that discarded e-waste are not ‘value-less’ waste, but instead embody value (specifically latent use value), and have the potential to be re-inserted as ‘raw materials’ into production networks through the processes of recycling. Also, key to the processes of value (re)creation, enhancement and capture is the labour process. I examine informal labour by focusing on karung guni (a local term for the rag-and-bone man) – analysing their critical role in value (re)creation in this regional e-waste recycling production network through the lens of petty commodity production. I argue that karung guni are constitutive of this production network through their collection and primary processing of e-waste, which forms the basis for subsequent value creation, enhancement and capture by downstream actors. Conceptualising karung guni as petty commodity producers – who own both the means of production and their own labour power – is significant in problematising as not so straightforward the separation of capital and labour into discreet categories as normally presented in global value chains (GVC)/global production networks (GPN) approaches. This thesis makes four significant contributions to the GVC/GPN literature. First, it recognises activities beyond the point of consumption (which has been the focus of present GVC/GPN research). Second, it conceptualises the constitutive role of informal labour in the development and structure of production networks. Third, it emphasises the continued relevance of the state. Fourth, by adopting a multi-sited case study method, it contributes to debates on how to carry out GVC/GPN research.

L’objet de cette thèse est d’analyser la double question de l’intégration ou de l’effacement progressif de l’agriculture dans la ville de Dakar et la valorisation agricole des déchets organiques urbains. Le premier aspect pose d’emblée la question de la gouvernance territoriale de l’action publique locale. Le second aspect renvoie à la multifonctionnalité de l’agriculture dans un contexte d’écologisation des activités humaines pour protéger l’environnement. Comment les maraîchers de Dakar s’adaptent-ils à cette double préoccupation ? La multifonctionnalité agricole peut-elle contribuer au maintien et au renforcement de l’activité maraîchère ? Ces questions ont été abordées en adoptant une approche interdisciplinaire croisant en particulier la sociologie et la géographie. Nous faisons l’hypothèse que cette nouvelle fonction environnementale de l’agriculture « péri-urbaine » constitue une opportunité pour les maraîchers de Dakar pour développer des stratégies d’adaptation au contexte local et au projet d’écologisation du secteur agricole. Une approche géographique de l’espace des Niayes (de Dakar) a fait apparaître que les pratiques agricoles sont largement déterminées par les caractéristiques de ce milieu soumis à une anthropisation renforcée par l’urbanisation. Nous montrons aussi que la mise en agenda des problèmes agricoles en ville à Dakar ressemble plus à de l’affichage politique qu’à une réelle inscription dans le projet urbain. Enfin, il existe des facteurs bloquants à surmonter pour « intensifier écologiquement » les systèmes de production agricole. Certains de ces facteurs trouvent leur origine dans l’inscription des pratiques agricoles dans le système socio-culturel local et dans le rapport des maraîchers avec le « monde » scientifique et les questions d’environnement. / The purpose of this thesis is to analyze the double issue of integration or the gradual disappearance of agriculture in the city of Dakar and the agricultural use of urban organic waste. The first aspect raises immediately the question of territorial governance of local public action. The second aspect refers to the multifunctionality of agriculture in the context of greening of human activities to protect the environment. How do gardeners adapt to this double concern: to maintain agriculture in city and promote urban organic waste? How can agricultural multifunctionality contribute to maintain and strengthen gardening activity? These issues were tackled by adopting an interdisciplinary approach crossing especially sociology and geography. We suppose that this new environmental function of “peri-urban” agriculture is an opportunity for gardeners in Dakar to develop strategies for adaptation to the local context and to the project of greening of agriculture. A geographical approach of Niayes’ space (Dakar) showed that agricultural practices are largely determined by the characteristics of this environment under human transformation reinforced by urbanization. We show also that the agenda of agricultural development problems in the city Dakar is likely to display political than an actual entry in the urban project. Finally, it remains blocking factors to overcome for “environmentally intensify” the systems of production of agriculture. Some of these factors are based on the registration of agricultural practices in the local socio-cultural system and the relations that gardeners have with the scientific “world” and environmental issues.

Cette thèse de doctorat analyse les inégalités écologiques dans les villes africaines, à travers l’exemple de Cotonou au Bénin, à l’aune du choléra. En tant que pathologie liée à l’exposition à un environnement insalubre, le choléra constitue un marqueur pertinent des inégalités écologiques, qu’il s’agisse d’inégalités d’exposition aux nuisances environnementales, d’accès aux aménités urbaines, de pouvoir d’interpellation de la puissance publique face aux nuisances environnementales ou de participation aux projets environnementaux. A travers l’approche par « effet de lieu », nous avons montré que l’incidence différentielle du choléra entre les arrondissements et les quartiers de Cotonou est liée non seulement à l’effet combiné du milieu et des profils socio-économiques, aux pratiques sociales, mais aussi aux politiques publiques, inspirées parfois des recommandations internationales dans le domaine de l’environnement, et qui occultent le contexte socio-politique local. / This doctoral thesis analyses the ecological inequalities in the african cities, by focusing on the example of Cotonou in Benin, with regard to cholera. As a pathology related to the exposure to an unhealthy environment, cholera forms a relevant marker of the ecological inequalities under all their forms: whether they are inequalities of exposure to the environmental nuisances, access to urban amenities, capacity to question the public power as far as environmental nuisances are concerned or participation in environmental projects. Through the approach by “effect of place”, we showed that the differential incidence of the cholera between the districts of Cotonou is related not only to the combined effect of the environment and the socio-economic profiles, social practices, but also with the public policies, inspired sometimes of the international recommendations in the field of the environment, and that overlook the socio-political local context.