Bacterial removal and protozoan grazing in biological sand filters

Journal of Environmental Quality
Anne-Marie BomoJon Fredrik Hanssen

Abstract

The objective of the study was to investigate the importance of protozoan predation as a biological removal mechanism in sand filters used for purification of bacteria from wastewater. Eleven sand filter columns were seeded with a high dose of wastewater (70 mm d(-1)) and a high concentration (10(8) colony forming units [CFU] mL(-1)) of Aeromonas hydrophila (American Type Culture Collection [ATCC] 14715) for a period of 30 d. Water samples from three filter outlets were analyzed for the concentration of A. hydrophila. In addition, one filter column was sacrificed each sampling day for the quantification of A. hydrophila, culturable bacteria (heterotrophic plate counts, HPC), total bacterial counts, and protozoa in the sand. The mean removal efficiency of A. hydrophila in the sand filter columns was 4.7 log units. The concentration of A. hydrophila in the sand filter effluent, however, had a clearly time-dependent pattern from high (log 6) and unstable concentrations to low and more stable levels (log 2). The removal efficiency of A. hydrophila correlated significantly (P = 0.0005, r2 = 0.6) with numbers of protozoa in the sand filters. Significantly higher (P < 0.05) concentrations of A. hydrophila were observed in sand filter ...Continue Reading

Citations

May 20, 2003·Water Research·Anne-Marie BomoJon Fredrik Hanssen
Feb 26, 2013·International Journal of Environmental Research and Public Health·Dong-Uk ParkKyeong-Min Lee
Jan 7, 2014·Journal of Environmental Management·A Y KatukizaP N L Lens
Jul 30, 2004·Journal of Applied Microbiology·A-M BomoA Frostegård
Jul 22, 2008·Environmental Microbiology·Vincent ThomasGilbert Greub
Aug 11, 2006·Water Research·Sylvaine ChabaudPierre Le Cloirec
Aug 13, 2015·Applied Microbiology and Biotechnology·Kristina R PfannesRainer U Meckenstock
Aug 30, 2014·Journal of Environmental Management·A Y KatukizaP N L Lens
Jun 2, 2006·Journal of Environmental Quality·José A AmadorErika L Nicosia
Sep 22, 2010·Water Environment Research : a Research Publication of the Water Environment Federation·Lan ZhangJeffrey S Karns
Jan 5, 2011·Environmental Science & Technology·Jacqueline M Thomas, Nicholas J Ashbolt

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