pH of the solution reaches to 10.5, the time was recorded,
and thewaterwas replaced by fresh distilledwater. A target pHwas
set as 10.5 because it is the preferable pH for the calcium phosphate
formation using lime in conventional wastewater treatment
(Jenkins et al., 1971; Tchobanoglous et al., 2004). The experiment
was terminated when the time required to reach pH 10.5 exceeds
one hour