US EPA

1351068 

Journal Article 

Separation of inorganic phosphorus from municipal wastewater by solvent extraction with primary amine in the presence of sodium molybdate 

Zhao, YC; Lin, M 

1999 

Yes 

Chemical Speciation and Bioavailability
ISSN: 0954-2299 

11 

4 

135-139 

WOS:000086681600003 

Effective extraction and separation of inorganic phosphorus from municipal wastewater with primary amine as a solvent in the presence of sodium molybdate was studied. The optimum extraction acidity was found to be at pH 6-7. When the content of inorganic phosphorus in aqueous solutions is in the range of 0-300 mg L-1, the quantitative extraction of the inorganic phosphorus can be obtained with 1% primary amine in n-heptane solution and a phase ratio of 1:1 in the presence of 10 g L-1 Mo. Over 75% organic phosphorus in wastewater cannot be extracted by primary amine. The loaded organic phase can be stripped quantitatively with NaOH solution and less than 20% organic phosphorus in the organic phase can be stripped. The resultant aqueous solution after stripping is used directly for colorimetric determination of inorganic phosphorus. 

inorganic phosphorus; solvent extraction; wastewater; primary amine