ORIGINAL RESEARCH
Removal of Organic Compounds from Municipal
Wastewater by Immobilized Biomass
M. Zielińska*, I. Wojnowska-Baryła
University of Warmia and Mazury in Olsztyn, Faculty of Environmental Sciences and Fisheries,
Prawocheńskiego 1,10-957 Olsztyn, Poland
Prawocheńskiego 1,10-957 Olsztyn, Poland
Pol. J. Environ. Stud. 2004;13(5):573–577
KEYWORDS
biomass immobilizationporous ceramic carriersmunicipal wastewaterorganic compoundsremoval by oxidationdenitrificationsludge yield and internal storage
ABSTRACT
Two porous ceramic carriers (internal active surface 0.04 m2 for carrier I and 0.2 m2 for carrier II) with
immobilized activated sludge were the stationary filling of the reactors. Municipal wastewater was treated
at hydraulic retention time (HRT) from 70 to 15 min. The efficiency of organic compounds removal from
wastewater changed for reactor I from 85.2 to 93.8%, for reactor II from 62.9 to 87.1%. The contribution
of oxidation, biomass synthesis, denitrification and intracellular storage in organic compounds removal
depended on the type of carrier and on hydraulic retention time (HRT). Over 20% of organic loading in
influent to reactors I and II was used for cellular oxidation. Only for reactor I at HRT 30 and 15 min higher
participation of nitrate respiration than oxygen was one observed. From 6.1 to 14.5% of loading in influent
was removed as a result of sludge yield. For reactor I the high contribution of intracellular storage in
organic compounds removal from wastewater was observed.
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