Análisis de alternativas para el diseño de una estación de depuración de aguas residuales para Benicarló
[EN] The main objective of the purification of wastewater, contaminated as a result of the use made of water, is the conservation of natural resources. The direct discharge of these waters into the environment involves the alteration of the ecosystems where these are dumped. This alteration is due t...
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| Tipo de recurso: | tesis de maestría |
| Fecha de publicación: | 2013 |
| País: | España |
| Institución: | Universitat Politècnica de València (UPV) |
| Repositorio: | RiuNet. Repositorio Institucional de la Universitat Politécnica de Valéncia |
| Idioma: | español |
| OAI Identifier: | oai:riunet.upv.es:10251/39149 |
| Acceso en línea: | https://riunet.upv.es/handle/10251/39149 |
| Access Level: | acceso abierto |
| Palabra clave: | Desass Benicarló Simulación Simulation TECNOLOGIA DEL MEDIO AMBIENTE Máster Universitario en Ingeniería Hidráulica y Medio Ambiente-Màster Universitari en Enginyeria Hidràulica i Medi Ambient |
| Sumario: | [EN] The main objective of the purification of wastewater, contaminated as a result of the use made of water, is the conservation of natural resources. The direct discharge of these waters into the environment involves the alteration of the ecosystems where these are dumped. This alteration is due to contaminants found in water such as organic matter, suspended solids, nutrients, and pathogens. One of the main changes that aquatic ecosystems may suffer as a result of the dumping of raw sewage is eutrophication. Caused by the nutrients found in the water ( N and P ), the water bodies eutrophication is the result of the input of organic matter due to the rapid growth of organisms such as algae and aquatic plants. The decomposition of this organic matter leads to the drastic reduction of dissolved oxygen in these ecosystems. Council Directive 91/271/EEC on Urban Wastewater Treatment of 21 of May 1991 which would collect the permitted limit value of each parameter, to be considered when pouring the resulting effluent of the water purification. In this master thesis a water treatment plant for the town of Benicarló will be designed, aiming to clean the residual water from the municipality according to the quality fixed by the European Board 91/271/CEE. The current WWTP consisting only in a pretreatment pours the water through a submarine outfall in a sensitive area near the coastline. It has been compared three biological treatment schemes. A conventional treatment system, a extended aeration process and a third consisting of a extended aeration process through a membrane bioreactor. Removing nitrogen was designed using nitrification and denitrification biological process, while the phosphorus removal had to be accomplished by chemical precipitation. Due to the high concentrations of salts found in water, autotrophic bacteria, responsible for performing the nitrification, have their growth partially inhibited. So for its growth, it has to be used high cell retention times, condition in which it is very difficult to grow PAO bacteria, responsible for phosphorus removal. Through the simulation program DESASS 7.1 (Design and Simulation of Activated Sludge Systems) the optimum operating conditions of the WWTP have been established regarding to sludge retention time and internal recirculation flow rate. After obtaining the results, the calculations of different costs have been performed. An analysis of these costs has been made in order to conclude which alternative is the most convenient. |
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