Table 5 General assumptions for the microalgae cultivation

Assumed depth of pond (m)

0.30

Assumed dimensions of a pond (m)

10, 100, and 0.30 for width, length, and depth, respectively

Fraction of area occupied by the PBRs (%)

0.10

Temperature (°C)

29.70

Characteristics of the wastewater

pH

6.60

Characteristics of the wastewater

Algae growth rate/productivity (g/m²/day)

25

[21, 22]

Mixing velocity in the pond (cm/s)

25

Electricity demand by paddle wheel (kW/ha)

2

Electricity demand to pump WW to pond (kWh/L)

2.40 × 10^-5

[23]

Electricity demand to pump from pond to bio-flocculation (kWh/L)

4.80 × 10^-5

Electricity demand for recycle pump (kWh/L)

2.50 × 10^-5

Electricity consumption for flue gas injection (kWh/kg CO₂)

2.22 × 10^-2

[24]

% of flue gases captured

90

Estimated

CO₂ utilization (% converted to algae)

85

[8, 23]

CO₂ required for algal growth (g CO₂/g algae dry)

1.92

From the microalgae composition

TN required for algal growth (g N/g algae dry)

0.09

From the microalgae composition

TP required for algal growth (g P/g algae dry)

1.28 × 10^-2

From the microalgae composition

TN reduction (%)

95

[25, 26]

TP reduction (%)

80

[8]

Water loss by evaporation (m/day)

6.91 × 10^-3

Average evaporation rate data for Metahara [27]

Algae oil content (wt.%)

30

[8], [28]

Culture density (g/L)

0.50 (0.10–2)

[22, 25]

Ratio of total pond area to total facility foot print (%)

84

[29]