Aspen Plus v12 models for design a project-based learning on developing a novel technology for slurry management

Preliminary investigation on the likelihood of trapping CO₂ and NH₃, which are emitted at a rate of 132 mg/h and up to 5.1 – 510 mg/h during the storage of manure at 25 °C, in brines of NaCl and CaCl₂ was conducted in Aspen Plus® v12. The supersaturated solution of 0.5 kg H₂O and 10 kg salt was considered to account for any possible absorption in the liquid film that is generated during the deliquescence phenomenon. Only in the case of using the CaCl₂ as dehydrating agent (anhydrous salt) in the prototype, the simulation in the commercial package predicted the absorption of CO₂ and NH₃ and formation of CaCO₃ and NH₄Cl. On the other hand, the extents of formation of NaHCO₃, and even NH₄HCO₃ or NH₄COONH₂ were found to be negligible under the conditions that the prototype operates. Prediction of the solubilities of NaCl, NH₄Cl, NaHCO₃, CaCO₃, Ca(OH)₂, CaCl₂, CaCl₂·H₂O, CaCl₂·2H₂O, CaCl₂·4H₂O, and CaCl₂·6H₂O in the temperature range 0 – 100 °C at 1 atm.