This work demonstrates the recovery of phosphorus from a solution (150 mg-P/L) using ferrous salts (FeSO4) and hydrogen peroxide (H2O2) as precipitants through the fluidized bed crystallization (FBC) process. Jar-test experiments were conducted to investigate effective pH and molar ratios of H2O2/Fe(II) and Fe(II)/P in the removal of phosphate. The pure ferric phosphate crystal was then recovered using the FBC process and the effluent pHe and surface loading (L, kg-P/m2h) were tested. The results of XRD revealed that the FBC pellets were composed of the mixtures of rodolicoite and giniite, with a Fe/P molar ratio of approximately 1.1, based on elemental analysis. Under conditions pHe = 2.6, an H2O2/Fe(II) molar ratio of 0.6, an Fe(II)/P molar ration of 1.2, and L = 0.3–0.89 kg/m2h, a crystallization ratio of 86% and a removal efficiency of 95% were achieved.
|Number of pages||8|
|Journal||Journal of the Taiwan Institute of Chemical Engineers|
|Publication status||Published - 2017 Nov 1|
All Science Journal Classification (ASJC) codes
- Chemical Engineering(all)