[Sorption-desorption of phosphate in wastewater by hydrous iron oxide].
FeCl3 was used t o prepare hydrous iron oxide (HIO) as a n absorbent for phosphate (P) sorption and desorption study. The results showed that as pH decreased, the sorption capacity of HIO increased, and the sorption kinetics followed the second-order model, and the sorption isotherm could be fitted by the Langmuir equation. A 50 g/L NaOH solution was used for desorption of P from HIO, and the desorption rate could be reached over 98% . No relation was found between desorption rate and adsorption capacity. Based on above results, HIO was applied to adsorption of P from supernatant of sludge thickener, and after desorption, more than 90% of P was recovered. According to the results obtained, an effective system for P removal and recovery from municipal wastewater was suggested, which includes the following processes: adsorption, desorption, regeneration of HIO, and of recovery of P from P-rich desorption solution.
Xiang
Xue-Min
XM
Key Laboratory of Industrial Ecology and Environmental Engineering, Ministry of Education, School of Environmental & Biological Science & Technology, Dalian University of Technology, Dalian 116023, China. hjyjs@dlut.edu.cn
Liu
Ying
Y
Zhou
Ji-Ti
JT
Wang
Ren
R
D000327:Adsorption; D005290:Ferric Compounds / Q000737:chemistry*; D010710:Phosphates / Q000737:chemistry* / Q000302:isolation & purification; D012722:Sewage / Q000737:chemistry*; D014865:Waste Disposal, Fluid / Q000379:methods*
D005290:Ferric Compounds; D010710:Phosphates; D012722:Sewage; C000499:ferric oxide