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Publikacje Pracowników Politechniki Lubelskiej
Status:
Autorzy: Sochan Agata, Polakowski Cezary, Ryżak Magdalena, Łagód Grzegorz
Wersja dokumentu: Drukowana
Język: angielski
Strony: 129 - 130
Efekt badań statutowych NIE
Materiał konferencyjny: NIE
Publikacja OA: NIE
Abstrakty: angielski
One of the possibilities of particle size distribution (PSD) measurement is laser diffraction method (LDM) (Arriaga et al. 2006). It is based on recording of scattered laser light. This scattering occurs on the measured particles, which are intensive stirred and pumped through measuring cell. The less size of the measured particle the bigger angle of scattered laser beam. LDM can be successfully used for measurement of PSD of activated sludge but one should remember that the result of this method should be rather treated as the parameter – not the real value (Bieganowski et al. 2012). The reason for this is the intensive stirring and pumping the suspension – the result is dependent on the geometry of the measuring system and energy of stirring and pumping. The scattered light can be recalculated into PSD according to two mathematical models called: Fraunhofer or Mie theory. Fraunhofer theory is recommended for the suspension with the particles bigger than 50 μm. Because there are smaller particles in the activated sludge the better choice is the Mie theory. In the case of applying the Mie theory the knowledge of optical indices (refractive index – RI and absorption coefficient – AC) is required to obtain the result (ISO 13320:2009). Because the activated sludge is the heterogeneous mixture (Złotucha et al. 2012; Jaromin-Gleń et al. 2013) of different materials there is no possibility to specify the actual values of the optical indices. The aim of this work is to answer the questions whether optical parameters can significantly influence on results of PSD of activated sludge measured by LDM. Concluding one have to state that optical parameters have impact on PSD of activated sludge. Therefore the standardization of the procedure is necessary.