Elevated cyanobacterial cell number

Elevated cyanobacterial cell numbers (4.7
106 cells/mL) and total microcystins concentrations (up to 10 mg/L) accumulated in the clarifiers of the treatment plant.
Breakthrough of cells and toxins in filtered water was observed. Also, a total microcystins concentration of 2.47 mg/L was measured in chlorinated drinking water. Cyanobacterial cells and toxins from environmental bloom samples were more resistant to chlorination than results obtained using laboratory cultured cells and dissolved standard toxins.