Abhatoo - Centre Nationale de Documentation

The biological study of a wastewater treatment plant by natural lagoon systems is an important aspect not to be neglected, especially as the Hammam-Foukani station is the first experience of wastewater treatment in the city of Figuig.
In this study, we focused on qualitative and quantitative monitoring of phytoplankton over a two year period. Microscopic observation of samples showed significant proliferation of Cyanobacteria such as Scynechocystis, Pseudoanabaena and Oscillatoria, as well as Chlorophyceae and Euglenophyceae. Chlorella showed strong growth in hot periods, while diatoms are moderately abundant downstream of the station.
The quantitative aspect indicates a strong phytoplankton bloom in summertime, measured as well by dosing chlorophyll pigments and by counting algal cells.
Rising temperatures and pH values as well as strong sunlight are the main factors for control of algal and cyanobacterial biomass.