Javier Lafuente

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The activated sludge process –the main biological technology usually applied to wastewater treatment plants (WWTP)– directly depends on live beings (microorganisms), and therefore, on unforeseen changes experimented by them. It could be possible to get a good plant operation if the supervisory control system is able to react to the changes and deviations of(More)
Although activated sludge process is a very widely used biological process in wastewater treatment plants (WWTP), and there are properly functioning control loops such as that of dissolved oxygen, in practice, this type of plant requires a major time investment on the part of the operator, involving many manual operations. Treatment plants work well most of(More)
This paper presents the development and implementation of a Real-Time Expert System (RTES) for the supervision and control of a wastewater treatment pilot plant (WWTPP) with biological removal of organic matter and nutrients. The hardware architecture contains different supervision levels, including two autonomous process computers (plant control and(More)
In this paper we investigate the influence of semantics in the text categorization. Moreover, we study how the vocabulary size reduction affects this task. The K Nearest Neighbours method was used to perform the categori-zation. In order to reduce the vocabulary size, the Information Gain technique was employed. A number of different document codification(More)
A dynamic model to describe ammonia removal in a gas-phase biofilter was developed. The mathematical model is based on discretized mass balances and detailed nitrification kinetics that include inhibitory effects caused by free ammonia (FA) and free nitrous acid (FNA). The model has been able to predict experimental results for dynamic operation under(More)
Removal of hydrogen sulfide from waste and energy-rich gases is required, not only because of environmental health and safety reasons, but also because of operational reasons if such gases have to be used for energy generation. A biotrickling filter for the removal of ultra-high concentrations of H2S from oxygen-poor gases is proposed and studied in this(More)
Evaluation of Tc-99m red blood cell (RBC) SPECT in suspected hemangioma of the liver shows a high sensitivity and specificity when lesions are larger than 2 cm, and allows for the discrimination between hemangioma and other hepatic lesions. However, its major limitation arises with small size lesions. The accuracy of Tc-99m RBC SPECT in small suspected(More)
Monitoring the biological activity in biotrickling filters is difficult since it implies estimating biomass concentration and its growth yield, which can hardly be measured in immobilized biomass systems. In this study, the characterization of a sulfide-oxidizing nitrate-reducing biomass obtained from an anoxic biotrickling filter was performed through the(More)
Turbo Spin Echo (TSE) is a sequence of choice for obtaining T(2)-weighted images. TSE reduces acquisition time by acquiring several echoes within each TR, at the cost of introducing an exponential weighting in the k-space that leads to a certain image blurring. This is particularly important for short-T(2) structures, which can even disappear if their size(More)