Adsorption characteristics and mechanism of ammonia nitrogen and phosphate from biogas slurry by Ca2+-modified soybean straw biochar
Fig 9
Adsorption isotherms of ammonia nitrogen (a-c) and phosphate (d-f): following the Langmuir model for ammonia nitrogen (a) and phosphate (d); the Freundlich model for ammonia nitrogen (b) and phosphate (e); the Langmuir–Freundlich for ammonia nitrogen (c) and phosphate (f).