CaCO₃ solubility in the process water of recycled containerboard mills

Abstract Water system closure in recycled containerboard mills may have reached a technical limit due to the accumulation of organic and inorganic contaminants process water. The specific water chemistry characteristics with restricted systems were analyzed computer model was developed simulate calcium carbonate solubility presence volatile fatty acids under relevant mill conditions. A strong linear correlation between VFAs ions found. dissolution mechanism, solubility, precipitation investigated. reaction results formation bicarbonate carbonic acid. By binding hydrogen ions, has pH buffering effect. acid dissociates into CO 2 . Gaseous escapes from leads decarbonization. This mechanism is responsible for uncoupling concentration VFAs, as well dissolved ions. resulting lack carbonates prevents carbonate. introduction contained biogas produced anaerobic biological treatment reverses causes Concentrating technologies such membrane filtration evaporation therefore meet requirements complete better than current commonly used treatment.