中和-络合萃取-双极膜电渗析处理金刚烷胺制药废水

Treatment of amantadine pharmaceutical wastewater by using neutralizationcomplex extraction-bipolar membrane electrodialysis combined process

采用中和沉淀-络合萃取-双极膜电渗析组合工艺协同处理金刚烷胺制药胺化废水与溴化废水.结果表明,通过胺化废水与溴化废水的中和反应,可以大幅消减废水中溶解性固体和有机污染物,避免后续萃取过程中的乳化现象.在pH值为8.0、油/水相比为1∶1的条件下,P204∶正辛醇=3∶2的复配萃取剂对废水中TOC和TN的萃取效率分别为56.9%和20.6%,金刚烷胺及其衍生物几乎被完全萃取.以2.0 mol·L-1的HCl溶液为反萃取剂,可以将47.5%的金刚烷胺从负载有机相中反萃分离,再生后的萃取剂可以多次重复使用.对萃余液采用双极膜电渗析进行处理,可以去除64.2%的无机盐和部分有机物,同时还能回收到较高浓度的酸,但由于氢离子的渗漏难以回收高浓度的碱.

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 p H 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 HCl solution of 2. 0 mol·L- 1and 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+.