关键词:

含磷废水, 复合钙盐, 磷肥, DMF

Abstract:

A new method of recovery of phosphorus from high concentration phosphorous-containing pharmaceutical industry wastewater with composite calcium was proposed. It was found that the efficiency of phosphorous removal from the wastewater was affected by dosage of composite calcium, pH of solution, and the mole ratio of calcium chloride and calcium oxide in the composite calcium. The production of phosphorus residue, the available phosphorus (calculated as P₂O₅) and N,N-dimethylformaide (DMF) in the phosphorus residue were also determined. The content of phosphorus in the wastewater could be reduced from 31000 mg·L^-1 to less than 0.5 mg·L^-1, and the content of the available phosphorus in the phosphorous residue was about 18%, approaching the national standard for superior grade product of phosphorus fertilizer. Furthermore, the poisonous material DMF was not detectable in the residue by GC-MS and spectra photometry.

Key words:

含磷废水, 复合钙盐, 磷肥, DMF