The flocculant demand of five algal species was tested based on the electrophoretic mobility (EM) of the cells in a Zeta meter. The algae exhibited time-dependent behaviour in EM when observed immediately after destabilisation. The charge reversal could be delayed up to 5 min after flocculant addition. Flocculant experiments in synthetic and natural water demonstrated that the dissolved organic carbon (DOC) and pH values had a much more important influence on the coagulation process for the algal cells, than the interspecific differences of the algae.

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