Freshwater microalgae Chlorella vulgaris was cultured and induced with strigolactone (GR24) to simultaneously eliminate nutrients in biogas slurry and purify biogas. Treatment with 10-7 M GR24 yielded maximum growth rate and mean daily productivity for algae at 0.187 ± 0.06 d-1 and 0.097 ± 0.008 g L-1 d-1, respectively. Results from chlorophyll fluorescence transients method demonstrated that moderate concentration of GR24 could enhance the photosynthetic performance of microalgae. In addition, GR24 affected intracellular carbonic anhydrase activity and chlorophyll-a content. Maximum chemical oxygen demand, total nitrogen, and CO2 removal efficiencies were 78.62 ± 2.36%, 76.47 ± 1.53% and 64.05 ± 1.15% with 10-7 M GR24 induction, respectively. Further, highest total phosphorus removal efficiency (80.27 ± 1.93%) was observed at 10-9 M. The optimal GR24 concentration range was determined to be between 10-9 and 10-7 M in consideration with nutrient and CO2 removal efficiencies.
Keywords: CO(2) removal; Chlorella vulgaris; Photosynthetic characteristic; Pollutant removal; Strigolactone.
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