The pH curve shows a rapid increase from pH 5.53 to pH 11.1
during the first 15 s (not visible in Fig. 1 due to a total time scale of
24 h) then a drop between 15 to 400 s. Furthermore, the pH increases logarithmically during the next 8 h and converges to a steady value, 1. where it reaches a quasi-equilibrium state. The final decrease in pH
after 16 h is due to absorption of CO2 from the atmosphere, as no countermeasures were taken to avoid CO2 intrusion, nor were the experiments performed under an inert gas atmosphere. This experi-
ment was repeated five times with similar results. Therefore, it can be assumed that every MgO suspension, prepared at given ambient conditions, is reproducible during the quasi equilibrium state, and is suitable as a precursor for struvite precipitation
The pH curve shows a rapid increase from pH 5.53 to pH 11.1during the first 15 s (not visible in Fig. 1 due to a total time scale of24 h) then a drop between 15 to 400 s. Furthermore, the pH increases logarithmically during the next 8 h and converges to a steady value, 1. where it reaches a quasi-equilibrium state. The final decrease in pHafter 16 h is due to absorption of CO2 from the atmosphere, as no countermeasures were taken to avoid CO2 intrusion, nor were the experiments performed under an inert gas atmosphere. This experi-ment was repeated five times with similar results. Therefore, it can be assumed that every MgO suspension, prepared at given ambient conditions, is reproducible during the quasi equilibrium state, and is suitable as a precursor for struvite precipitation
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