Abstract
In order to meet the growing demand for phosphate rock and sludge treatment, this study developed a hydrothermal oxidation–precipitation method for efficiently recovering phosphorus from dewatered sludge. The method could recover almost 90% of the phosphorus in sludge and acquire solid recyclate with a phosphorus content of 9.47%±0.21%. Oxidation, acidification, and complexation during the hydrothermal oxidation process contributed releasing the majority of phosphorus into liquid products. The newly formed flocs between humic substances and scarcely-soluble phosphate became final recyclate during recovery stage.
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