Eq./m 3 , when WW was treated with advanced treatment systems such as SBR and combined with microalgae systems. The above comparison clarifies that microalgae, when combined with other WW treatment might not reduce GWP and hence, the question arises was whether it could be considered for nutrient recovery. The answer to this question lies as when or if microalgae can be standalone WW treatment and nutrient recovery, a single-pot system like MFC. As MFC had a negative emission, only single-pot solutions can solve the environmental issues of nutrient recovery.