混凝—热固化联合空气吹脱法处理高浓度水性油墨废水

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1 406.25 mg/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%。

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

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%.