Methodology
63
Therefor :
L= √ 5 × í µí±† 𝑝
 Calculation of the total mass of microalgae in raceway ponds (Xa)
We have : Xa =
𝑳 𝟎
𝑪 𝒎
With :
Cm : Volume load (kg BOD5/m
3 .d), Mc= 0.3 Kg BOD5/ Kg VSS.d.
L0 : BOD5 pollutant load at pond inlet (kg /d).
 Calculation of the concentration of microalgae in raceway ponds ( [Xa])
We have :
[Xa]=
𝑋 𝑎
𝑉 𝑇
 Calculation of the dwell time
We have:
td =
𝑽 𝑻
𝑸
With :
td : Dwell time (h).
VT: Total volime of raceway pond (m
3 ), (we have :VT =2541.375 m
3 ).
Q : Wastewater flow rate.
 For the Average hourly flow (𝑸 𝒂𝒗𝒆𝒓.𝒉 )
We have :
𝒕 𝒅 =
𝑽 𝑻
𝑸 𝒂𝒗𝒆𝒓.𝒉
 For the dry weather peak flow (𝑸 𝑫𝑾𝑷 )
We have :
Td =
𝑽 𝑻
𝑸 𝑫𝑾𝑷