Analisi della fase di start-up di un bioreattore a membrana

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Abstract

[automatically translated] The application of MBR systems, while ensuring high removal yields, is still now limited, because of some factors that affect the operation. Among these, one of the main is the fouling due to the fouling phenomena of the part of the biological membrane suspension. In memory we report the first results of a study which had the objective of defining the evolution and influence of fouling on the filtration process during plant start-up, it happened without the initial inoculum of mud. The experiment was conducted in a pilot plant consists of a bioreactor within which is installed the hollow fiber membrane module in a submerged configuration. The wastewater used for the testing was carried out before the primary settlement tanks of municipal sewage treatment plant of the city of Palermo. The results confirmed that the MBR plant already in the starting phase reaches good purification performance and high biomass concentrations, thanks to the rapid growth that develops in the bioreactor due to the selective barrier. With regard to the characterization and performance of the hydraulic resistances characterizing fouling during the trial, it was shown that the membrane was subjected to a globally increasing fouling, with significant increases significantly especially in the first days of activation. The trend over time of the resistance due to surface deposit of flocs (cake deposition) was found to be correlated with that of the suspended solids in the tank; it was increasing in time, to the exclusion of the first week, with greater speed than the resistance due to the deposit of solids within the pores (pore blocking), even if the latter is maintained higher than the first absolute value. Finally, fouling of the membrane was put in relation with the dimensional characteristics of the biomass flakes; the particle size analysis performed for this purpose has highlighted the progressive increase of the presence of micro-flakes in the reactor, which can then charge the corresponding increase fouling of the membrane. it was increasing in time, to the exclusion of the first week, with greater speed than the resistance due to the deposit of solids within the pores (pore blocking), even if the latter is maintained higher than the first absolute value. Finally, fouling of the membrane was put in relation with the dimensional characteristics of the biomass flakes; the particle size analysis performed for this purpose has highlighted the progressive increase of the presence of micro-flakes in the reactor, which can then charge the corresponding increase fouling of the membrane. it was increasing in time, to the exclusion of the first week, with greater speed than the resistance due to the deposit of solids within the pores (pore blocking), even if the latter is maintained higher than the first absolute value. Finally, fouling of the membrane was put in relation with the dimensional characteristics of the biomass flakes; the particle size analysis performed for this purpose has highlighted the progressive increase of the presence of micro-flakes in the reactor, which can then charge the corresponding increase fouling of the membrane. Finally, fouling of the membrane was put in relation with the dimensional characteristics of the biomass flakes; the particle size analysis performed for this purpose has highlighted the progressive increase of the presence of micro-flakes in the reactor, which can then charge the corresponding increase fouling of the membrane. Finally, fouling of the membrane was put in relation with the dimension
Original languageItalian
Number of pages0
Publication statusPublished - 2006

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