Preliminary Study of Enhanced Removal of Phosphate by Iron Oxides Formed in situ through Reducing Fe (VI) with Fe (II)

Author

Ma, Weichao ; Ma, Jun ; Liu, Fang

Author_Institution

Sch. of Municipal & Environ. Eng., Harbin Inst. of Technol., Harbin, China

fYear

2009

fDate

11-13 June 2009

Firstpage

1

Lastpage

4

Abstract

Phosphorous removal in secondary by ferric (Fe(III)) was investigated in presence of ferrate (Fe(VI))/ferrous(Fe(II)). In the raw water, adding Fe(VI) or Fe(VI)+Fe(II) could increase the phosphorous removal in comparison to Fe(III) coagulation. For initial phosphate concentration of 2.5 mg P/L, phosphate removal rates of about 15-30% were observed. But the increasing removal rate was not associated with the dosage of total Fe. At the same dosage of total Fe, about 10% increasing was observed. The experimental data of synthetic water demonstrated that Fe(VI) and Fe(II) form freshly amorphous hydrated iron oxides which had much more adsorptive capacity due to theirs small size and amorphous state, therefore they had much affinity for ligand phosphate. The dominant mechanism for the phosphate removal with Fe(VI) + Fe(II) was adsorption firstly, then co-precipitation.

Keywords

adsorption; decontamination; iron compounds; phosphorus compounds; precipitation; reduction (chemical); Fe (II); Fe (VI); Fe(III) coagulation; Fe⁺; Fe⁵⁺; PO₄ ^3-; adsorption; amorphous hydrated iron oxides; coprecipitation; enhanced phosphate removal; ferrate; ligand phosphate; phosphorous removal; reduction; Aluminum; Amorphous materials; Chemical processes; Coagulation; Costs; Effluents; Iron; Microorganisms; Surface treatment; Wastewater treatment;

fLanguage

English

Publisher

ieee

Conference_Titel

Bioinformatics and Biomedical Engineering , 2009. ICBBE 2009. 3rd International Conference on

Conference_Location

Beijing

Print_ISBN

978-1-4244-2901-1

Electronic_ISBN

978-1-4244-2902-8

Type

conf

DOI

10.1109/ICBBE.2009.5163222

Filename

5163222