High value pigment production and carbon sequestration through wastewater grown Spirulina (Arthrospira) platensis: A green technology for wastewater utilization

•Biomass yield of 2.764 ± 0.03 g/L of S. platensis obtained in amended aquaculture wastewater.•Yield of biomass in amended wastewater was only 0.89% lesser than synthetic medium.•Biomass composition of demonstrated a maximum cell productivity of 0.0734 ± 0.0050 g/L/day.•Rate of carbon sequestration was 0.0314 g/L/day in wastewater cultured Spirulina.•Downstream processing of wastewater grown biomass yielded 101.95 ± 1.49 mg/g DW of the natural colorant Phycocyanin.