悬浮结晶法冷冻处理喹乙醇生产废液

采用悬浮结晶法处理喹乙醇生产废液,考察了成冰率(冰晶融化后的体积占原水总体积的百分比)对废液COD、氨氮、TN和电导率去除效果的影响。在一级冷冻成冰率45%的条件下,经过三级冷冻处理后,三级出水的COD、氨氮、TN和电导率的去除率分别为99.4%、98.7%、98.5%和98.2%,一级浓缩液的COD、氨氮和TN的浓缩比分别为1.6、1.5和1.5;在一级冷冻成冰率80%的条件下,每一级出水的各项指标的去除率均有所下降,三级出水的COD、氨氮、TN和电导率的去除率分别为98.6%、98.3%、97.1%和95.9%,但一级浓缩液的浓缩比明显提高,COD、氨氮和TN的浓缩比分别为2.7、2.2和2.4。成冰率为80%时一级浓缩液的热值为7 449 J/g,在焚烧过程中可以依靠自身热量维持燃烧,不需要添加辅助燃料,减少焚烧处理的成本。

Treatment of liquid wastes from olaquindox production by suspension crystallization method

The liquid wastes from olaquindox production were treated by suspension crystallization method. The effects of ice formation rate （the volume ratio of melt water to raw water） on removal of COD,ammonia nitrogen,TN and conductivity were studied. Under the condition of ice formation rate of the first-stage freezing 45%,the removal rates of COD,ammonia nitrogen,TN and conductivity of the 3-stage effluent were 99.4%,98.7%,98.5% and 98.2% after three stage freezing treatment,and the concentration ratio of COD,ammonia nitrogen and TN of the first-stage concentrate were 1.6,1.5 and 1.5,respectively;Under the condition of ice formation rate of the first-stage freezing 80%,the removal rates of each stage effluent were decreased,and those of the 3-stage effluent were 98.6%,98.3%,97.1% and 95.9%,respectively,but the concentration ratio of COD,ammonia nitrogen and TN of the first-stage concentrate were 2.7,2.2 and 2.4,which were significantly increased. Combustion value of the first-stage concentrate was 7 449 J/g,which meant it could maintain combustion in the incineration process by its own heat. No addition of auxiliary fuel made the incineration cost reduced.