Phycoremediation and biogas potential of native algal isolates from soil and wastewater

► Pioneering study to integrate phycoremediation and biogas production. ► First report on phycoremediation and biogas potential of terrestrial and aquatic alga. ► More than 70% reduction in COD by algal isolates. ► Good synergy of algal isolates with native microbes in phycoremediation. ► Biogas yield in the range of 0.401-0.487 m3 Kg−1 VS added.