RT info:eu-repo/semantics/article T1 Fouling control of submerged and side-stream membrane bioreactors based on the statistical analysis of mid-term assays A1 Martínez Díaz, Raquel A1 Ruiz Pérez, María Olga A1 Ramos Rodríguez, Cipriano A1 Cámara Nebreda, José María A1 Diez Blanco, Victorino K1 Membrane bioreactors K1 External membrane K1 Submerged membrane K1 Reversible and irreversible fouling rates K1 Box-behnken experimental design K1 Ingeniería química K1 Chemical engineering AB The response surface methodology has been applied to study reversible and irreversible fouling rates caused by anaerobic sludge in membrane bioreactors, with the aim of controlling membrane fouling by adjusting filtration conditions. The challenge of obtaining statistically significant results of long-term fouling by means of mid-term assays has been addressed. The individual and combined effects of the filtration flux, backwashing intensity, gas sparging and crossflow velocity on membrane fouling, were analyzed in two types of membranes: an external tubular membrane and a submerged hollow fiber membrane. In the external membrane, the reversible fouling rate was as low as 0.27 ± 0.10 mbar/min, depending mainly on the filtration flux and gas sparging. However, the principal control parameter of the irreversible fouling rate was the crossflow velocity, reaching 2.12 ± 1.75 1012 m−2 in terms of increase of resistance per cubic meter filtered by square meter of membrane. In the submerged membrane, the irreversible fouling rate was quite lower, 0.78 ± 0.40 mbar/d, despite the reversible fouling rate was higher, 1.26 ± 0.42 mbar/min. In this case, the irreversible fouling depended mainly on the backwashing frequency despite the reversible fouling was more affected by the filtration flux and gas sparging. Hence, the approach used to control the reversible fouling rate does not involve mitigating irreversible fouling on both submerged and external membranes. This study provides a methodological basis for the selection of site-specific operating conditions, under which sustainable operation of membrane bioreactors could be achieved. PB Elsevier SN 0959-6526 YR 2021 FD 2021-12 LK http://hdl.handle.net/10259/6205 UL http://hdl.handle.net/10259/6205 LA eng NO TCUE 2018–2020 cofounded by European Regional Development Fund (ERDF) and Junta de Castilla y León (Spain) and the inestimable collaboration of Campofrío Frescos and Grupo Ecoalia. DS Repositorio Institucional de la Universidad de Burgos RD 29-mar-2024