ISSN 0235-7224
ISSN 2029-0586 (online)
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2009 m. Nr. 3-4
Tetrad-forming-organism-dependent deterioration of
enhanced biological phosphorus removal in a full-scale
wastewater treatment plant
Giedrė VABOLIENĖ, Janina BRAŽĖNAITĖ
Proliferation of tetrad-forming organisms (TFOs) has been suggested to cause deterioration of enhanced biological phosphorus removal (EBPR) in wastewater treatment plants. TFOs are known store glycogen as an energy source, thus they are called glycogen-accumulating organisms (GAOs) and can compete with polyphosphate-accumulating organisms (PAOs) for volatile fatty acids. Wastewater temperature and sludge age have proven to be important factors in determining EBPR stability. The efficiency of BPR decreased with an increase of wastewater temperature. An increased population of TFOs and a higher level of glycogen were found in the activated sludge when the efficiency of EBPR was low. After decreasing the age of sludge to 5 days, EBPR stabilized and started functioning effectively. Glycogen concentration in the activated sludge decreased with decreasing wastewater temperature.
Keywords: biological phosphorus removal, enhanced biological phosphorus removal, polyphosphate-accumulating organisms, tetrad-forming organisms, glycogen-accumulating organisms
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