[Extraction and stripping of H acid and DSD acid wastewater]

H acid and DSD acid are two important substrate of dyes, which wastewater is treated more difficulty because of containing multi-component, with high chroma value and nonbiodegradability. A treatment way of this wastewater by extraction based on chemical association was carried out. Trialkylamine (Alamine 336) and chlorinated quaternary ammonium salt (Aliquat 336) were used as reacting agent with n-octanol, kerosene as modifier and diluent respectively. Results showed that the extraction efficiency depended on solution pH. Alamine 336 could be used to treat waste water with low pH while Aliquat 336 was high efficiency for waste water with pH > 6. Recovery yield of H acid and DSD acid was greater than 99% and the chroma value of wastewater was reduced effectively by simulating multi-stages cross-flow extraction. Back-extraction is quite easy and the solvent could be regenerated.