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Development of an air-scour control system for membrane bioreactorsFerrero, Giuliana 01 July 2011 (has links)
The thesis involves the development and implementation of a new and
robust control system based on permeability trends but at the same time capable of
reducing aeration proportionally to permeate flux. Permeability was made a key
parameter for directly comparing temporary changes in membrane performance.
Transmembrane pressure and flux were gathered every 10 seconds and permeability
values were automatically calculated; different mathematical algorithms were applied
for the signal filtering of on-line data. Short term and long term permeability trends
were compared once a day, and a control action was applied proportionally to the short
term/long term permeability ratio without exceeding the aeration flow recommended by
the membrane suppliers. / El treball presentat a la tesi inclou el desenvolupament i la implementacio d’un nou
sistema de control robust basat en les tendencies de la permeabilitat i, al mateix temps,
capac de reduir l’aeracio de forma proporcional al flux de permeat. S’ha seleccionat la
permeabilitat com el parametre clau per comparar directament els canvis temporals en el
funcionament de les membranes. La pressio transmembrana i el flux es mesuren cada 10
segons i llavors la permeabilitat es calcula automaticament. El senyal de les dades
recollides en linia es filtra adequadament mitjancant diversos algoritmes matematics.
L’algoritme de control compara diariament una tendencia a curt termini de la
permeabilitat amb una tendencia a llarg termini de la permeabilitat, i s’aplica una accio
de control proporcional al quocient de les dues tendencies, sense excedir mai el cabal
d’aeracio recomanat pels fabricants de membranes.
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