The construction and operation of central wastewater treatment plants started around the 20th century. With the advent of rigorous membrane research and development in the middle of the 20th century, more and more wastewater plants started incorporating a Membrane BioReactor, MBR, in their design. The MBR system however is far from perfect. Membrane systems continuously foul, and if fouling is incurred for a long period of time, maintenance and cleaning costs will rise in proportion. A Fouling monitoring and prediction tool has been designed in MATLAB\Simulink. The model takes states related to membrane fouling, and calculates the membrane total resistance based on deterministic and stochastic models. The tool is capable of predicting future TMP cycles based on older TMP performance via an artificial neural network algorithm. TMP data have been synthetically generated from a validated mathematical model. Finally, an artificial neural network controller is implemented to control temperature and MLSS around their desired setpoints. The controller is able to minimize disturbances in both states in a narrow band around their desired setpoints.

Made available in DSpace on 2016-06-02T20:00:31Z (GMT). No. of bitstreams: 1 2763.pdf: 2681165 bytes, checksum: 7237b8c3b1ff40a69103153b0c034e41 (MD5) Previous issue date: 2009-06-26 / Financiadora de Estudos e Projetos / The purpose of this work is to evaluate, according to the population s perception, the benefit to the environment by treating the sanitary sewers flowing into the Limoeiro stream located in Presidente Prudente, in the state of Sao Paulo. It is sometimes difficult to place a value on natural resources and this research attempts to develop a method to place a value to this particular natural resources, the Limoeiro stream. By making it possible to have a base of common comparison, the financial value, provides a justification for investments in environment conservation projects. With this objective, the contingent valuation method was used to evaluate the natural resource which investigated the disposition of the population to pay for this process in two types of scenarios. In the first scenario, which presents the legal view of the conservation, determined that it would be R$ 5,12 with 95% of entrust and a plus or minus 10% margin of error. In the second scenario, which presents the ideal view of the water course conservation would be R$ 7,35 also showing a 95% entrust and a plus or minus 10% margin of error. A period of 30 years was stipulated and the global liquid present value between R$ 9.126.914,16 to R$ 16.011.288,26 with a discount tax of 12% of the capital. / O presente trabalhou teve por objetivo valorar, conforme a percepção da população, o ganho de qualidade ambiental produzido pelo tratamento dos esgotos sanitários no curso de água córrego Limoeiro, município de Presidente Prudente, estado de São Paulo. Os recursos naturais não têm seu valor estipulado pelo mercado, sendo assim, necessita-se de outros meios, como a presente pesquisa, para contribuir no sentido de valorar os recursos naturais, sendo então possível ter uma base de comparação comum, qual seja, o valor financeiro, para justificar investimentos e projetos na área da conservação ambiental. Com esse objetivo, de valorar o recurso natural, utilizou-se o método de valoração contingente que buscou captar a disposição a pagar (DAP) da população para dois Cenários. No Cenário que atendia a disposição legal foi captada uma DAP per capta da ordem de R$ 5,12, com 95% de confiabilidade e uma margem de erro de 10% para mais ou para menos. No Cenário que atingia a situação ideal de conservação do curso de água a DAP per capta captada foi de R$ 7,35, também com 95% de confiabilidade e uma margem de erro de 10% para mais ou para menos. Foi estipulado um período de 30 anos e o valor presente líquido global encontrado está na faixa de R$ 9.126.914,16 a R$ R$ 16.011.288,26, para uma taxa de desconto do capital de 12% ao ano.