There are many cases in which the atmosphere contained into the process buildings on a Waste Water Treatment Plant (WWTP), show important deficiencies regarding air renovation.
R. Cerdá Ortiz *; J.M. Juárez-Galán; A.J. Amo Peña; I. Valor
Aqualogy Medio Ambiente. C/Dracma 16-18. Polígono Industrial Las Atalayas. 03114 Alicante. * ruben.cerda@labaqua.com
Keywords: CFD, odours, ventilation, energy efficiency, WWTP.
Abstract
There are many cases in which the atmosphere contained into the process buildings on a Waste Water Treatment Plant (WWTP), show important deficiencies regarding air renovation. This contributes to increase the concentration of chemical compounds, which can be potentially responsible of odour episodes, health risk for the operators, corrosion and fugitive emissions. In many occasions, ventilation systems are designed based on over sizing the air changes per hour ratio (ACH), without ensuring an optimal behavior. The verification of ventilation systems efficiency is a very complex task in which the consideration of several parameters is required. Thus, it is mandatory to use tools able to predict the bahaviour of air and pollutans contained into process buildings. Simulation by CFD (Computational Fluid Dynamics) software, is a cutting-edge tool for assisting in the optimization of ventilation systems in process buildings, in a cost and time saving way, with the aim of improving the indoor air quality and the extraction of odours for an adequate treatment, optimizing the costs derived from the ventilation. In this paper, the CFD optimization of the ventilation systems of a sludge dewatering building located on a WWTP is presented. The results of the study show the deficiencies on the initial design proposed so, several modifications, both geometric and operational, were suggested. The study also proves that the most efficient design is not always the one in which the highest ACH ratio is used. The obtained result implies a better indoor atmosphere (lower pollutant concentration), and an approximated cost savings around 25% of the ventilation costs.
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