The influence of a high density of rotifers, which is known to be able to control filamentous bacteria, on the parameters of an activated sludge process was examined in four professional laboratory batch reactors. These reactors allow the imitation of the work of a wastewater treatment plant with enhanced nutrient removal. The parameters, including oxygen concentration, pH and temperature, were constantly controlled. The experiment showed that Lecane rotifers are able to proliferate in cyclically anaerobic/anoxic and aerobic conditions and at dissolved oxygen concentrations as low as 1 mg/L. In 1 week, rotifer density increased fivefold, exceeding the value of 2,200 ind./mL. The grazing activity led to an improvement in settling properties. Extremely high numbers of rotifers did not affect the main parameters, chemical oxygen demand (COD), N-NH4, N-NO3, P-PO4 and pH, during sewage treatment. Therefore, the use of rotifers as a tool to limit the growth of filamentous bacteria appears to be safe for the entire wastewater treatment process.
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Research Article|
October 19 2013
Effect of the rotifer Lecane inermis, a potential sludge bulking control agent, on process parameters in a laboratory-scale SBR system
Wioleta Kocerba-Soroka;
1Institute of Environmental Sciences, Jagiellonian University, Gronostajowa 7, 30-387 Kraków, Poland
E-mail: wioleta.kocerba@uj.edu.pl
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Edyta Fiałkowska;
Edyta Fiałkowska
1Institute of Environmental Sciences, Jagiellonian University, Gronostajowa 7, 30-387 Kraków, Poland
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Agnieszka Pajdak-Stós;
Agnieszka Pajdak-Stós
1Institute of Environmental Sciences, Jagiellonian University, Gronostajowa 7, 30-387 Kraków, Poland
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Mateusz Sobczyk;
Mateusz Sobczyk
1Institute of Environmental Sciences, Jagiellonian University, Gronostajowa 7, 30-387 Kraków, Poland
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Małgorzata Pławecka;
Małgorzata Pławecka
2Przedsiębiorstwo Inżynierii Miejskiej Sp.z o.o. ul, Szarych Szeregów 2, 43-502 Czechowice- Dziedzice, Poland
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Janusz Fyda
Janusz Fyda
1Institute of Environmental Sciences, Jagiellonian University, Gronostajowa 7, 30-387 Kraków, Poland
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Water Sci Technol (2013) 68 (9): 2012–2018.
Article history
Received:
April 16 2013
Accepted:
June 28 2013
Citation
Wioleta Kocerba-Soroka, Edyta Fiałkowska, Agnieszka Pajdak-Stós, Mateusz Sobczyk, Małgorzata Pławecka, Janusz Fyda; Effect of the rotifer Lecane inermis, a potential sludge bulking control agent, on process parameters in a laboratory-scale SBR system. Water Sci Technol 1 November 2013; 68 (9): 2012–2018. doi: https://doi.org/10.2166/wst.2013.453
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