The coupled system of wastewater treatment and microalgal biofuel production based on microalgal cultivation
is a promising process. Screening of suitable microalgal species for this coupled system is necessary
to achieve the dual purpose of the single system. In this study, biomass production, nutrient removal,
and lipid accumulation in domestic secondary effluent by Haematococcus pluvialis were investigated.
The maximal algal dry weight, maximal population growth rate, and maximal algal biomass productivity
achieved by H. pluvialis in a typical domestic secondary effluent were 207 mg L−1, 1.16 × 104 cells mL−1 d−1,
and 27.8 mg L−1 d−1, respectively. Although the nitrogen/phosphorus ratio was as high as 15:1 in the secondary
effluent used in this study, both nitrogen (93.8%) and phosphorus (97.8%) were removed efficiently
by H. pluvialis when the stationary growth stage was reached. Furthermore, the lipid content of H. pluvialis
increased from 25% to 43% due to nutrient depletion on the 10th day of cultivation. The maximal lipid
accumulation rate obtained was 12.0 mg L−1 d−1. Compared with most microalgal species reported in the
literature, H. pluvialis showed significant advantages in biomass production, nutrient removal, and lipid
accumulation in domestic secondary effluent.
The coupled system of wastewater treatment and microalgal biofuel production based on microalgal cultivation
is a promising process. Screening of suitable microalgal species for this coupled system is necessary
to achieve the dual purpose of the single system. In this study, biomass production, nutrient removal,
and lipid accumulation in domestic secondary effluent by Haematococcus pluvialis were investigated.
The maximal algal dry weight, maximal population growth rate, and maximal algal biomass productivity
achieved by H. pluvialis in a typical domestic secondary effluent were 207 mg L−1, 1.16 × 104 cells mL−1 d−1,
and 27.8 mg L−1 d−1, respectively. Although the nitrogen/phosphorus ratio was as high as 15:1 in the secondary
effluent used in this study, both nitrogen (93.8%) and phosphorus (97.8%) were removed efficiently
by H. pluvialis when the stationary growth stage was reached. Furthermore, the lipid content of H. pluvialis
increased from 25% to 43% due to nutrient depletion on the 10th day of cultivation. The maximal lipid
accumulation rate obtained was 12.0 mg L−1 d−1. Compared with most microalgal species reported in the
literature, H. pluvialis showed significant advantages in biomass production, nutrient removal, and lipid
accumulation in domestic secondary effluent.
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