Table 2 Characteristics of the effluent from the photobioreactor and the pollutants removal efficiency in the steady state period.

From: Growth of microalgae and cyanobacteria consortium in a photobioreactor treating liquid anaerobic digestate from vegetable waste

Indicator

Mean value ± standard deviation

Concentration

Removal rate (%)

Ammonium nitrogen

27.1 ± 2.8 mg/L

X

Nitrates

230.6 ± 8.6 mg/L

X

Nitrites

0.7 ± 0.1 mg/L

X

Total nitrogen*

73.4 ± 3.8 mgN/L

89.3 ± 0.5

Orthophosphates

95.1 ± 7.3 mg/L

72.8 ± 2.1

Soluble COD

696.9 ± 128.0 mgO2/L

91.2 ± 1.6

Total COD

1687.5 ± 482.9 mgO2/L

78.9 ± 6.0

  1. X—removal rate not determined for individual nitrogen compounds due to the fact that nitrates and nitrites are formed during the oxidation of ammonium nitrogen.
  2. *Calculated as the sum of all nitrogen forms (NH4+, NO3−, NO2−) computed from Eq. (2).
Back to article page