Organics (COD) removal in dependence on loading of volatile fatty acids (VFA)

• Autorzy: Bernat K. , Wojnowska-Baryła I. , Dobrzyńska A.

Warianty tytułu

PL

Usuwanie związków organicznych (ChZT) w zależności od obciążenia osadu czynnego ładunkiem lotnych kwasów tłuszczowych (LKT)

• Języki publikacji: EN

Abstrakty

EN

The aim of the study was to estimate the influence of volatile fatty acids (VFA) loading on the contribution of the biomass growth, cell respiration, denitrification and poly-β-hydroxybutyrate (PHB) accumulation involved in COD removal by activated sludge. Kinetics of PHB production, PHB and COD consumption were determined. Experimental series were carried out in sequencing batch reactor. The amount of air entering SBR was maintained at the stable set-point of 2 mg O_2/L, oxygen depletion phase occurred in initial hours of the reaction time. SBR was fed with the mixture of municipal wastewater and supernatant from the digesters. Feast period of the external organic substrate availability (f_1) and famine period of little organics availability (f_2) were determined. With VFA loading (rVFA) increase from 0.029 to 0.052 g VFA/g VSS•d in the feast period, the effectiveness of COD removal depended on the use of organics for denitrification and internal PHB storage. PHB content in activated sludge increased from 0.2 to 0.35 C_mol/C_mol. In f1 biomass growth and cell respiration in COD removal decreased from 21 to 14% and from 12 to 5%, respectively. In the famine period the remaining organics were removed due to biomass growth and cell respiration, denitrification and internal PHB storage was not observed.

PL

W pracy określono udział usuwania związków organicznych (ChZT) ze ścieków w procesach przyrostu biomasy, oddychania komórkowego, denitryfikacji oraz syntezy kwasu poli-β-hydroksymasłowego (PHB) w zależności od obciążenia osadu czynnego ładunkiem lotnych kwasów tłuszczowych w ściekach. Ponadto przeanalizowano kinetykę magazynowania oraz degradacji kwasu poli-b-hydroksymasłowego. Eksperyment prowadzono w reaktorze sekwencyjnym SBR. Ilość powietrza doprowadzanego do reaktora była automatycznie ustawiona na poziomie 2 mg O_2/L, w początkowych godzinach fazy reakcji notowano fazę wyczerpywania tlenu w reaktorze. SBR był zasilany ściekami komunalnymi z udziałem wód nadosadowych z komór fermentacyjnych.

Słowa kluczowe

EN

VFA loading; activated sludge; poly-B-hydroxybutyrate storage; biomass growth; cell respiration; denitrification process

PL

usuwanie związków organicznych; osad czynny; przyrost biomasy; oddychanie komórkowe; denitryfikacja

• Wydawca: Institute of Environmental Engineering, Polish Academy of Sciences
• Czasopismo: Archives of Environmental Protection
• Rocznik: 2010
• Tom: Vol. 36, no. 4
• Strony: 93--105
• Opis fizyczny: Bibliogr. 18 poz., tab., wykr.

Twórcy

autor

Bernat K.

autor

Wojnowska-Baryła I.

autor

Dobrzyńska A.

• University of Warmia and Mazury in Olsztyn, Department of Environmental Biotechnology, Sloneczna str. 45G,10-709 Olsztyn, Poland,

Bibliografia

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