2020 Volume 76 Issue 7 Pages III_181-III_187
This paper reports the recovery of phosphorus and potassium from biomass aiming at removing accumulated nutrients in soil in agriculture and to reuse them. At first, the thermodynamic properties were determined for precipitate which contains phosphorus and potassium together in pure chemical solution. The precipitate formed had K:Mg:P ratio of 1:1:1, but different crystalline structure from struvite-K reported so far. The solubility product, ΔrG°, ΔrH° of dissolution reaction of the precipitate were 10−10.9, −62.4 and −23.0 kJ/mol, respectively. Then, a method to recover P and K from biomass was proposed. The experiment demonstrated that those elements were recovered when KCl solution was used as the initial extraction solvent.
Proceedings of the Symposium on Global Environment
PRE-PRINTS OF THE SYMPOSIUM ON GLOBAL ENVIRONMENT
ENVIRONMENTAL SYSTEMS RESEARCH
ENVIRONMENTAL SYSTEMS RESEARCH
ENVIRONMENTAL ENGINEERING RESEARCH
PROCEEDINGS OF ENVIRONMENTAL AND SANITARY ENGINEERING RESEARCH
