Figure 8From: Dual application of duckweed and azolla plants for wastewater treatment and renewable fuels and petrochemicals productionEnergy-dispersive x-ray spectroscopy analysis of bio-char and ash from duckweed, azolla and microalgae. (A-C) Bio-char; (D-F) ash; (A, D) duckweed, (B, E) azolla and (C, F) microalgae.Back to article page