Treatment of amantadine pharmaceutical wastewater by using neutralization-complex extraction-bipolar membrane electrodialysis combined process
Neutralization,complex extraction and bipolar membrane electrodialysis combined process was applied to the treatment of amantadine pharmaceutical amination wastewater and bromination wastewater.The results showed that the neutralization process between amination wastewater and bromination wastewater could substantially remove the dissolved solids and organic pollutants,avoiding the emulsification in the following complex extraction process ; Under the conditions of pH value 8.0,oil to water ratio 1 ∶ 1 and P204 ∶ octanol =3∶ 2,extraction efficiencies of TOC and TN reached 56.9％ and 20.6％,respectively,with almost all amantadine and its derivatives removed.About 47.5％ amantadine was stripped from the loaded solvent with HC1 solution of 2.0 mol· L-1 and the complexion extractant can be reused for many times in the extraction and back-extraction processes.Bipolar membrane electrodialysis process could remove 64.2％ inorganic salt and some organic pollutants from the wastewater after the complex extraction.The recycled high concentration acid can be reused but the recovery of high concentration alkali was difficult due to the leakage of H+.
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