Results and discussions
80
Sizing of a wastewater
plant with the Application
of activated sludge, in
Bouinan, Blida.
Surface area
6 hectares
Purification yield
90%
Total
energy
requirement
1440 kw
According to table Table 22, that shows the results of comparison between microalgae and
activated sludge processes used in this study and two other studies, for a number of Inhabitent
Equivalent that is approximately the number of the proposed WWTP we note that :
 Secondary astewater treatment using activated sludge requires a large surface area.
 Secondary wastewater treatment using microalgae, has shown the highest purification
yeald (92,8%).
 The lowest Total energy requirement, was recorded in the secondary treatment using
microalgae, while the highest energy requirement was recorded in the process with
activated sludge, and that is due to pumping.
 the ideal process with the most advantages for wastewater treatment is the microalgaebased treatment process.
1.5.3. Tertiary treatment (disinfection)
The disinfection methode proposed is disinfection with sodium hypochlorite. The calculations
results of sizing the disinfection basin are summarized in table 23.