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Mini-plant and bench-scale studies on the fouling mechanisms as well as the responsible organic foulants during direct filtration of algal-containing waters using hollow-fiber membranes
This study mainly explores comprehensive investigations which were carried out on fouling scenarios in Polyethersulfone hollow-fiber (HF) membrane modules occurring during filtration of various suspensions containing microalgae. Intensity and various types of fouling were correlated to properties and cell condition of the microalgae, organic components of the algal-containing suspension, and membrane retention. Four microalgae species were individually suspended in two extreme cell conditions which are intact (i.e., growth / algae bloom phase) and lysed (i.e., death and ultimate cell breakage phase). Suspensions were made without prior separation of algal cells, debris, and algae organic matter (AOM) as in case of real application. Mini-plant filtration experiments were performed at operating conditions close to full-scale application, up to 16 multiple cycles of dead-end constant flux filtration and mechanical backwashing, equivalent to 1,040 L/m2 total filtered volume per one experiment. Moreover, the temporal variation of fouling mechanisms with the number of filtration cycles performed was modelled via a consolidation between classical pore blocking filtration model and resistance-in-series model using a self-made algorithm. This method allows changes in the contribution of different fouling mechanisms (in fouling rates per cycle and in fouling reversibility over multiple filtration cycles) to be properly interpreted. Additionally, the observed fouling behavior could be identified as combined fouling and reliably correlated with the ratio of individual chemical substances in the AOM and chlorophyll-a concentration, as well as with the cell conformation and size distribution of the microalgae. The vast majority of experiments reported in the literature investigating membrane performance loss and fouling behavior during filtration of microalgae were conducted using flat sheet membranes (FS) that are backwashable only once, if at all. Additionally, the fouling mechanisms (in particular, cake layer formation) ...
Mini-plant and bench-scale studies on the fouling mechanisms as well as the responsible organic foulants during direct filtration of algal-containing waters using hollow-fiber membranes
This study mainly explores comprehensive investigations which were carried out on fouling scenarios in Polyethersulfone hollow-fiber (HF) membrane modules occurring during filtration of various suspensions containing microalgae. Intensity and various types of fouling were correlated to properties and cell condition of the microalgae, organic components of the algal-containing suspension, and membrane retention. Four microalgae species were individually suspended in two extreme cell conditions which are intact (i.e., growth / algae bloom phase) and lysed (i.e., death and ultimate cell breakage phase). Suspensions were made without prior separation of algal cells, debris, and algae organic matter (AOM) as in case of real application. Mini-plant filtration experiments were performed at operating conditions close to full-scale application, up to 16 multiple cycles of dead-end constant flux filtration and mechanical backwashing, equivalent to 1,040 L/m2 total filtered volume per one experiment. Moreover, the temporal variation of fouling mechanisms with the number of filtration cycles performed was modelled via a consolidation between classical pore blocking filtration model and resistance-in-series model using a self-made algorithm. This method allows changes in the contribution of different fouling mechanisms (in fouling rates per cycle and in fouling reversibility over multiple filtration cycles) to be properly interpreted. Additionally, the observed fouling behavior could be identified as combined fouling and reliably correlated with the ratio of individual chemical substances in the AOM and chlorophyll-a concentration, as well as with the cell conformation and size distribution of the microalgae. The vast majority of experiments reported in the literature investigating membrane performance loss and fouling behavior during filtration of microalgae were conducted using flat sheet membranes (FS) that are backwashable only once, if at all. Additionally, the fouling mechanisms (in particular, cake layer formation) ...
Mini-plant and bench-scale studies on the fouling mechanisms as well as the responsible organic foulants during direct filtration of algal-containing waters using hollow-fiber membranes
Laksono, Sucipta (author) / Panglisch, Stefan
2021-08-05
Theses
Electronic Resource
English
Fouling potentials and properties of foulants in an innovative algal-sludge membrane bioreactor
| DOAJ | 2021
| British Library Conference Proceedings | 2006