Abstract:

Aqueous bromamine acid (sodium 1-amino-4-bromine-anthraquinone-2-sulfonate) solution was selected as the sample in this study. The change of the solute and solvent in the freezing field was investigated. The results indicated that the ice sample was obviously divided into four layers as micro-pollution layer，cleaned layer，mixed layer and precipitate layer after aqueous bromamine acid solution was completely frozen. The water quality of the cleaned layer was almost unaffected by coolant temperature in the range of －5℃ to －30℃. The removal rate of chemical oxygen demand (CODCr)，total organic carbon (TOC) and chroma were all above 97%. As the coolant temperatures fell from －5℃ to－30℃，the volume of the cleaned layer decreased from 64.7% of the total volume to 35.3%. The water quality of the cleaned layer was also almost unaffected by bromamine acid concentration in the range of 50 mg/L to 1000 mg/L. The volume of the cleaned layer decreased from 49.4% of the total volume to 29.4%，and the CODCr and TOC were 25 mg/L and 2 mg/L respectively at －25℃.