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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
11

A Chemical Substitution Study For A Wet Processing Textile Mill In Turkey

Ozturk, Ertan 01 June 2007 (has links) (PDF)
The main environmental concern in the textile industry is about the amount of water discharged and the chemical load it carries. The total quantity of chemicals used in textile mills varies from 10% to over 100% of the weight of the cloth produced. Many chemicals currently used in the textile industry affect the amount and the type of waste produced and their influence the aquatic life of the receiving stream. One of the critical steps in pollution prevention studies is auditing the use of chemicals and making the necessary chemical substitutions. Chemical substitution simply means the replacement and/or reduction of hazardous chemicals in products and processes with less- or non-hazardous ones. This study was conducted on one of the major textile factories in Turkey with a capacity of 20,000 tons of denim fabric per year. During this study, chemical consumption level, recipes applied, environmentally problematic and alternative chemicals were examined. Integrated Pollution Prevention and Control (IPPC) Reference Document on Best Available Techniques (BAT) for the Textile Industry was accepted as main reference document and also related case studies were examined. According to the study, over 60% reduction in sulphide, which is very toxic to aquatic life, was achieved by replacing sulphur dyestuff with low sulphide content. By replacing an alternative complexing agent, the mill not only prevented the 3100 kg/month COD load to the WWTP, but also obtained more biodegradable wastewater generated during production. On the other hand, some of the chemical substitution options were on progress or dropped.
12

Beyond the fences : co-ordinating individual action in rural resource management through Landcare : a case study of managing non-point source discharges to water in Waikato, New Zealand

Ritchie, Helen, University of Western Sydney, Hawkesbury, Faculty of Environmental Management and Agriculture January 1998 (has links)
This study addresses the central problem of how the behaviour of individuals may be co-ordinated to manage collective natural resources, and in particular, to what degree this can be achieved through voluntary, community based means under a free market policy regime. This question was explored by researching how local groups known as Landcare, or Care groups, are managing waterways in Waikato, New Zealand, and specifically by examining their effectiveness in controlling non-point source contaminants to water originating from agricultural land.An action research approach was used to investigate research questions regarding what motivates actors to support activity to enhance water quality, the effectiveness of such activity in addressing non-point source discharges to water, and the equity issues which are associated with environmental management through Landcare. This study suggests that neo-liberal philosophies of governance, while favouring voluntary resource management, disregard the conditions which, in practice, underpin effective and equitable examples of this type of activity. A call is therefore made for a more active role for government, in directly supporting local action, in compensating for the impacts of free-market policies on natural resource use, and in facilitating the representation of the diversity of views in environmental management. Action research, participatory planning, and other learning based and communicative processes could be usefully employed to guide and inform such interventions / Doctor of Philosophy (PhD)
13

Pollution prevention in Oregon's electronics industry

Jones, Cynthia L. 17 January 1995 (has links)
Pollution prevention is promoted by the Environmental Protection Agency (EPA) and other governmental agencies as a method of reducing the generation of wastes and pollutants. Pollution prevention is also called source reduction because it reduces wastes early in the production process. Source reduction has been used by some industries to comply with governmental regulations and decrease costs associated with the management of hazardous materials. Nationally, the electronics industry generates a large quantity of hazardous waste. Similarly in Oregon, the electronics industry has recently been identified by the DEQ as one of the top five polluters in the state. The purpose of this research was to identify pollution prevention strategies that are currently being used by the electronics industry in Oregon and to assess the industry's interest in switching to less hazardous practices. A questionnaire was distributed to 180 businesses, which included all industries affiliated with the Oregon Electronics Association and additional electronics firms listed in Oregon phone directories. From those responding to the survey, the results indicated that electronics organizations in Oregon manufacture a wide variety of products including circuit boards, cable assemblies, software, laser equipment, printers, and control panels. Over half of those participating in the survey reported that the largest quantity of hazardous materials were generated early in the manufacturing process. Forty-seven percent of the respondents indicated they had attempted incorporating less hazardous compounds to those used previously. Common problems encountered which discouraged the industry from switching to less hazardous products or processes were revealed by the participants to include: The new product/process did not work as well (37%), did not believe current practices were harmful (18%), cost factors (14%), pressure from governmental agencies (3%), and other factors (28%). Fifty percent of those responding revealed that their company recycles materials within the facility. Participants indicated the products which were most likely to be recycled included cardboard (19%), office paper (18%), tin/aluminum (13%), newspaper (12%), and used chemicals (11%). The largest number of participants (43%) defined "green" or "environmentally safe/friendly" products as those that contain no known hazardous chemicals. Using this chosen definition, sixty-five percent of those responding indicated their organization did use these "green" products. It was indicated by those returning completed surveys that one reason the industry has attempted to incorporate less hazardous products and processes into their production process is primarily because of long term financial benefits. Other factors influencing the use of less hazardous materials included ethical concerns and the desire to find safer products that work as well as current products. A vast majority of respondents indicated more should be done in the area of pollution prevention and want leadership to come from within the industry itself. It is recommended that top executives in this field meet to share methods of overcoming obstacles to pollution prevention, clarify current terminology as it relates to new products, develop a system of rewarding those who are engaging in pollution prevention activities and promote technology transfer. / Graduation date: 1995
14

Chemical process optimization and pollution prevention via mass and property integration

Hortua, Ana Carolina 15 May 2009 (has links)
The process industries such as petrochemicals, chemicals and pharmaceuticals, among others, consume large amounts of material and energy resources. These industries are also characterized by generating enormous amounts of waste that significantly contribute to the pollution of the environment. Integrated process design is a very effective technique in conserving process resources and preventing pollution. The design and environmental constraints may involve a variety of component- and property-based restrictions. To date, most techniques have been developed to handle process constraints which is either composition-based (via mass integration) or property-based. No work has been reported to handle the synthesis of resource conservation network that is governed by both constraints. The objective of this work is to develop a systematic and cost-effective design technique that is aimed at minimizing the consumption of fresh resources and the discharge of pollutants simultaneously. Because of the nature of the component- and property-based constraints, this approach is based on mass and property integration and takes into account the process constraints and also environmental regulations. In this research work, a new approach has been developed to simultaneously address component-based recycle constraints as well as property-based discharge constraints. The proposed optimization technique is intended to minimize the consumption of fresh resources, the pollutant content in the waste streams, and the operational and waste treatment costs. Additionally, a mixed-integer nonlinear programming (MINLP) formulation is solved for a case study of phenol production from cumene hydroperoxyde to illustrate the new problem and devised solution algorithm.
15

An analysis of state efforts on adaptation to climate change in the transportation sector with applications to Georgia

Guobaitis, Vincent Michael 18 November 2011 (has links)
With climate change arising as an important issue in the 21th century, many states have been working diligently to develop climate action plans with the hopes of reducing greenhouse gas emissions and stop climate change from occurring. According to scientists' theories, however, many places across the globe are already feeling the effects of a changing climate and must therefore switch their focus from mitigation to adaptation. In the United States, there has been a focus on how climate change will impact one of the most vulnerable parts of the country, the transportation infrastructure. Many countries have already begun adapting their transportation infrastructure to climate change including the United States. This thesis focuses on how states are adapting to climate change by analyzing strategies, frameworks, and reports released by these states in order to document where they stand in regards to adaptation of the transportation network. The states that are adapting their transportation infrastructure are Washington, Oregon, California, Hawaii, Alaska, Florida, North Carolina, Maryland, Delaware, Pennsylvania, Michigan, Connecticut, Massachusetts, Vermont, and Maine. There is also a brief summary of how Canada and the United Kingdom are preparing for climate change with an analysis of frameworks and strategies used to adapt their transportation infrastructure. The ultimate goal of this thesis is to provide engineers and policymakers with evidence that several states are implementing adaptation into transportation projects and provide a variety of strategies for them to use in their own state. Specifically, this report provides applications of adaptation for Georgia to use, so that they can begin the lengthy process of adapting their transportation infrastructure to climate change.
16

The impact of the diversity of cultures upon the implementation of the international management code for the safe operation of ships and for pollution prevention

Trafford, Sean Michael January 2006 (has links)
Shipping is a fragmented, global industry operating in a culturally diverse environment. As a result of rising maritime accident rates and pollution incidents in the 1970s and 1980s, the International Maritime Organisation introduced two conventions that entered fully into force in 2002: the International Management Code for the Safe Operation of Ships and Pollution Prevention (ISM Code), and the 1995 revision of the 1978 Convention on Standards of Training, Certification and Watchkeeping for Seafarers (STCW Code). Introduction of the conventions served to focus the attention of the international maritime community on the need to raise industry-wide safety standards, but questions were raised about whether it was possible to develop a safety culture in a fragmented, global industry and what effects the diversity of cultures might have upon implementation of the ISM Code. This study explores those questions. Subsequent to a review of the literature, a model of the working of the ISM Code is developed and used to identify the constraints and pressures, particularly those that might be influenced by cultural values and attitudes, that impact upon the development and implementation of a Safety Management System in individual shipping organisations, which is the essence of the ISM Code. A comparative case study methodology is adopted for the empirical research and a number of investigative techniques are used to test the ISM Code model and obtain both qualitative and quantitative data to determine whether the impact of culturally influenced constraints and pressures would be best addressed by stricter enforcement of existing regulatory provisions or greater emphasis on education and training. From analysis of the data collected, the study concluded that: • Professional, vocational and safety training correctly utilised are effective in harmonising culturally influenced safety perspectives, thus improving safety performance; and • Culturally influenced constraints and pressures can be dealt with by the application of standard management techniques which, in a multi-cultural environment requires good cross-cultural management skills. The most common method of determining how effective a company has been in dealing with the various constraints and pressures affecting safety performance is to evaluate the efficacy of the organisation's Safety Management System by analysis of accident records, lost time incidents and hazardous occurrences (ACNSI, 1993). These data, reported under the provisions of Clause 9 of the ISM Code, are therefore analysed and compared with an industry sector benchmark. The study however, goes beyond such a purely quantitative approach and establishes the relative safety climate of the case study companies by means of perceptual audit of salient, safety-related factors. This qualitative technique draws together all the main research elements of the study and a Safety Climate Comparator is developed that provides a useful indicator of the relative status of those culturally influenced factors that ultimately affect a company's safety performance. By extension, the technique may be used to provide a Relative Safety Culture Maturity Model to measure the safety climate of other shipping companies relative to a benchmark standard.
17

Evaluating water quality impacts of alternative management practices through development of a BMP database

Butler, Gary Brooks, January 2007 (has links) (PDF)
Thesis (M.S.)--Auburn University, 2007. / Abstract. Vita. Includes bibliographic references (ℓ. 111-121)
18

Assessment of application, effectiveness, and compliance of forestry best management practices in West Virginia

Goff, William A. January 2005 (has links)
Thesis (M.S.)--West Virginia University, 2005. / Title from document title page. Document formatted into pages; contains ix, 109 p. : ill. (some col.), maps (part col.). Includes abstract. Includes bibliographical references (p. 103-105).
19

Simulating the effects of riparian zone delineation and management practices on landscape pattern and timber production

Bellchamber, Sara B. January 2004 (has links)
Thesis (M.S.) University of Missouri-Columbia, 2004. / The entire dissertation/thesis text is included in the research.pdf file; the official abstract appears in the short.pdf file (which also appears in the research.pdf); a non-technical general description, or public abstract, appears in the public.pdf file. Title from title screen of research.pdf file viewed on (June 29, 2006) Vita. Includes bibliographical references.
20

Modeling the influence of climate and management practices on water quality in Goodwater Creek experimental watershed

Bockhold, Amanda Koelling. January 2006 (has links)
Thesis (M.S.) University of Missouri-Columbia, 2006. / The entire dissertation/thesis text is included in the research.pdf file; the official abstract appears in the short.pdf file (which also appears in the research.pdf); a non-technical general description, or public abstract, appears in the public.pdf file. Title from title screen of research.pdf file (viewed on August 21, 2007) Includes bibliographical references.

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