混凝—热固化联合空气吹脱法处理高浓度水性油墨废水

Treatment of high-concentration water-based ink wastewater by combination process of coagulation-heat curing and air stripping

采用混凝—热固化联合空气吹脱法处理高浓度水性油墨废水。混凝—热固化法处理高浓度水性油墨废水的优化工艺条件为混凝剂NS-1投加量7.36 g/L,热固化温度75℃,热固化时间30 min,在此条件下COD去除率达91.00%,色度去除率达99.00%。空气吹脱法处理混凝—热固化出水,初始ρ(氨氮)对氨氮去除率影响较小;气液比增大、废水pH升高、吹脱次数增加、废水温度升高均能提高氨氮去除率。在废水初始ρ(氨氮)为1 406.25mg/L、气液比为2 667、废水pH为11.50、废水温度为25℃、连续吹脱4次的条件下,氨氮去除率达95.34%。

The high-concentration water-based ink wastewater was treated by the combination process of coagulation-heat curing and air stripping. The optimum conditions for coagulation-heat curing were as follows：coagulant NS-1 amount 7.36 g/L,heat curing temperature 75 ℃,heat curing time 30 min. Under these conditions,the removal rate of COD and chroma reached 91.00% and 99.00%,respectively. Then the effluent was treated by air stripping. The removal rate of NH3-N increased with the increasing of gas-liquid ratio,wastewater pH,air stripping times and wastewater temperature,but not initial ρ（NH3-N）. When the initial ρ（NH3-N） was 1 406.25 mg/L,the gas-liquid ratio was 2 667,the wastewater pH was 11.50,the wastewater temperature was 25 ℃ and air stripping for 4 times,the removal rate of NH3-N was 95.34%.