Statistical modeling of phosphorus solubilization from chemical sludge and evaluation of optimal sodium hydroxide dose.

摘要: Abstract Phosphorus (P) recovery from sludge has drawn widespread attention across the world to minimize P load watershed, a concern for eutrophication, and meet stringent effluent discharge regulations in some countries. Waste activated (WAS) dewatered (DS) were treated with wide range of NaOH doses (0–0.75 g g−1 TS). The WAS was diluted 4.5%–2.25% TS before treatment make comparable amount as DS (2.25%–1.5%). kinetic study illustrated that solubilization reached equilibrium within first 20 min duration. Significant positive correlation found between solution pH solubilization, whereas effect mostly insignificant. experimental data well fitted exponential models exhibited maximum about 67% 56% at 0.71 0.27 g g−1 TS, respectively. optimal application dose 0.36 g g−1 0.20 g g−1 obtained 64% 48% modeling approach this could be utilized other types sludges having similar ratio mechanisms further extended type techniques.