Changes in density and composition of algal assemblages in certain unit processes of two South African water purification plants

  • MGJ Oosthuizen
  • S Janse van Vuuren

Abstract

The water purification plants at Virginia and Bothaville, South Africa, experience problems with cyanobacteria and other algae. Their algal assemblages were studied during 2010 and 2011 to determine the dominant species that may pose problems in purification. Cyanobacteria, diatoms and green algae were the dominant phytoplankton taxa and constantly succeeded each other in both plants. Blooms of cyanobacteria in the raw water were due to high temperatures and nitrogen concentrations. These organisms were mostly eliminated during sedimentation, indicating that the purification procedures were sufficient for effective removal of cyanobacteria. It was possible to relate algal assemblages, dominance and succession to prevailing environmental variables.

Keywords: algae, blooms, blue-green bacteria, dissolved inorganic nitrogen

African Journal of Aquatic Science 2014, 39(3): 313–326

Author Biographies

MGJ Oosthuizen
Unit for Environmental Sciences and Management, North-West University, Potchefstroom, South Africa; current address: 5F, -12, No. 2-13, Yutian Road, Wanli District, New Taipei City, 20744, Taiwan (ROC)
S Janse van Vuuren
Unit for Environmental Sciences and Management, North-West University, Potchefstroom, South Africa
Published
2014-11-07
Section
Articles

Journal Identifiers


eISSN: 1727-9364
print ISSN: 1608-5914