冷冻分凝原理处理溴氨酸水溶液方法初步研究

Application of freeze-dephlegmation to bromamine acid aqueous solution purification

以溴氨酸水溶液为对象,研究水溶性有机物溶液在冷冻场下溶质和溶剂的变化特征。试验表明,溴氨酸水溶液完全冻结后,冰样可分为4层:微污染层、洁净层、混合层和析出层。在-5～-30℃范围内,温度对洁净层水质影响不明显,其化学需氧量(CODCr)、总有机碳(TOC)和吸光度去除率均达97%以上,但洁净层体积分数从64.7%降至35.3%。溴氨酸浓度在50～1000 mg/L范围内,溶液浓度变化对洁净层水质无影响,在-25℃,其冰融水的CODCr和TOC分别保持在25 mg/L和2 mg/L左右,洁净层体积分数从49.4%降至29.4%。

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℃.