Dissertation submitted in compliance with the requirements for the Master's Degree in Technology: Biotechnology, Technikon Natal, 2001. / The vegetable oil industry produces effluent containing quantities of fat, oil, sodium, phosphates as well as other pollutants. Oils and greases tend to clog sewers and pumps, thus creating difficulties within the municipal wastewater treatment works. Physico-chemical treatment methods, such as (Dissolved Air Flotation) OAF, gravity separation and the use of coagulants have been attempted providing a considerable reduction in organic loading; however, discharge standards are still not met. Thus, biological treatment methods are being sought after. Aerobic treatment has been attempted however, shock loads cause problems while running such a process. The objective of this study was to assess the efficiency of anaerobic digestion to degrade Vegetable Oil Effluent (VOE) as well as the efficiency of the Anaerobic Baffled Reactor (ABR). Anaerobic digestion involves the breakdown of organic matter by the action of microorganisms in the absence of oxygen, producing methane-rich biogas. The VOE was characterized, providing significant information on its chemical composition. It was found that the effluent had high sulphate content as well as a high COD content. High sulpahte content of wastewaters have known to promote growth of Sulphate Reducing Bacteria (SRB), which utilize the same energy source as Methane Producing Bacteria (MPB) and therefore compete for the same energy source. Sulphate and lipid reduction pretreatment experiments were carried out, using barium chloride and gravitational separation respectively. The results obtained, showed that the use of barium chloride to reduce sulphate content in VOE was successful, with significant sulphate reduction. The lipid reduction experiments however, did not show any significant lipid reduction. Batch tests were conducted in serum bottles to assess the extent of biodegradation of the VOE in its raw state as well as with reduced sulpahte content. Methanogenic toxicity tests on the raw and pretreated VOE provided a range of toxicity results. These assays are relatively simple and inexpensive. Gas production was monitored to determine the rate and extent of biodegradation. The efficiency of digestion was assessed by COD reduction. Results indicated potential inhibition of the methanogenic bacteria responsible for methane production by the / M

by Fung Wai-kan, Kai Siu-lung. / Abstract also in Chinese / Bibliography : leaves 106-108 / Thesis (M.B.A.)--Chinese University of Hong Kong, 1982

Orientador: Fernando Sarti / Tese (doutorado) - Universidade Estadual de Campinas, Instituto de Economia / Made available in DSpace on 2018-08-20T22:48:23Z (GMT). No. of bitstreams: 1 Ruas_JoseAugustoGaspar_D.pdf: 4470321 bytes, checksum: c691e9c4afc9d211f35e0952db4c6dc5 (MD5) Previous issue date: 2012 / Resumo: A descoberta de petróleo na camada Pré-Sal brasileira trouxe novos desafios para o país, tanto em âmbito macroeconômico, quanto microeconômico e energético/ambiental. Estes desafios, por sua vez, conduzem a uma necessária reorganização de instituições e políticas para o desenvolvimento econômico nacional. No âmbito microeconômico, a compreensão dos determinantes da dinâmica de concorrência na indústria parapetrolífera é um dos elementos indispensáveis para construção de políticas de desenvolvimento industrial. Esta tese apresenta como a coevolução das trajetórias tecnológicas e de acumulação de capitais condicionam as dinâmicas de concorrência nos diversos e heterogêneos segmentos da indústria parapetrolífera. A análise destas trajetórias e de suas características aponta para a dinâmica de investimentos na indústria petrolífera e para as políticas de Estado como determinantes fundamentais em sua constituição. Estes fatores também determinam, em conjunto com as estratégias de empresas parapetrolíferas, o perfil da inserção setorial dos agentes líderes e a composição regional da produção desta indústria. Por sua vez, o perfil desta inserção, da formação dos grandes players, guarda relação direta com sua capacidade de acumular e participar ativamente nas redes de aprendizado e de constituição de projetos dominantes em cada segmento. A partir destes pontos de vista esta tese analisa a indústria de equipamentos subsea, um dos segmentos de maior destaque na indústria parapetrolífera brasileira, seja pelo elevado volume de encomendas no país, seja pela participação nacional no desenvolvimento tecnológico do setor. Em âmbito mundial, a emergência desta indústria está relacionada à evolução histórica e investimentos da indústria petrolífera offshore. Esta evolução conduz à formação redes para desenvolvimento de produtos e serviços, ao progressivo crescimento das possibilidades de acumulação nestes mercados e, especialmente nas últimas décadas, à internacionalização produtiva destes agentes. Este movimento condiciona um processo de concentração setorial, seja através de investimentos greenfield, seja através de fusões e aquisições, que progressivamente promove redução das possibilidades de entrada de novos players e condiciona as estratégias de desenvolvimento local. O Brasil, que esteve diretamente associado ao desenvolvimento histórico desta indústria, mesmo tendo atuação decisiva na formação dos projetos dominantes, grande volume de encomendas e capacidade produtiva construída desde a década de 1980, perde espaço na estrutura patrimonial no último ciclo da indústria. Ao contrário de outros países, não houve uma política de formação de grandes grupos nacionais no setor, permitindo uma atuação mais ativa na dinâmica de concorrência global recente. Essas características de sua formação histórica explicam as potencialidades e limitações deste conjunto de segmentos industriais para os próximos anos e indicam os quais os desafios para uma nova estratégia no setor / Abstract: The discovery of Brazilian's Pre-Salt brought up challenges to deal with forthcoming macroeconomic, microeconomic and environment/energetic new contexts. These challenges, on their turn, leads to necessary reorganizations of institutions and national development policies. At the microeconomic level, the understanding of oil supply industry competitive dynamics is a vital element in building new industry development policies. This thesis shows how the coevolution of technological and capital accumulation paths affects the competitive dynamics of numerous and heterogeneous oil supply industry segments. The analysis of those pathways and their features indicate oil industry investment and state policies as their vital determinants. These factors also determine, together with oil supply companies strategies, the leading supplier positioning and regional composition of industry production. On the other hand, firm positioning and the development of leading suppliers are related with their ability to accumulate capital and to become actively involved in learning networks and dominant design product development. The subsea equipment industry, a distinguished segment of Brazilian oil supply industry, is studied here based on this set of working premises. First of all, worldwide, the emergence of this industry can be related to the offshore oil industry investment history. This investment evolution explains equipment and services research and development networks emergence, possibilities of capital accumulation on those market segments and, especially in the past decade, to internationalization of companies and their production. These movements, on their turn, determines a process of sectorial concentration, carried out through greenfield investments, mergers and acquisitions. Finally, as a result of this concentration, higher entry barriers to newcomers and restricted scope of national policy instruments characterize current subsea biggest segments. Historically, Brazilian subsea industry played a great role in equipment and subsea operation technology development, and also had a large proportion of world market since 1980?s. Despite these features, Brazilian companies couldn?t play similar role in the last years. Unlike other pioneer countries, Brazil have not promoted its indigenous companies consolidation, especially during 1990?s and 2000?s industry internationalization process. This absence favored foreign groups, which enlarged their investment in Brazil since mid nineties. This process increased national production capacity and sectorial efficiency, but reduced national companies share in large segments. These features explains current Brazilian subsea industry strengths and weakness, and indicates which challenges need to be addressed in a Pre-Salt new sectorial strategy / Doutorado / Teoria Economica / Doutor em Ciências Econômicas