湿式氧化处理制药废水的实验研究

STUDY ON PHARMACEUTICAL WASTEWATER TREATMENT BY WET OXIDATION PROCESS

研究了湿式氧化处理对模拟制药废水的处理效果,并探究其对后续生化处理效果的影响。实验使用的模拟头孢制药废水含有1.5 g/L的7-ACA、0.5 g/L的头孢曲松钠以及1 m L/L的DMF,COD平均浓度为2 650 mg/L。实验的湿式氧化部分采用了WAO和WPO两种工艺,后续生化处理使用SBR工艺。实验结果得出,WAO工艺的最优工况为:温度210℃、p H=7、氧气分压2 MPa、反应时间3 h,得出的COD去除率为67.8%;WPO工艺的最优工况为:温度150℃、p H=7、双氧水投量为计算理论值、反应时间1 h,得出的COD去除率为70.8%。经湿式氧化工艺处理后的模拟废水再进入SBR反应器,出水COD去除率可达80%,并且SBR的负荷也得到了提高。

The aim of this experiment is to investigate the treatment for simulated pharmaceutical wastewater by wet oxidation process,as well as its effect to the subsequent biochemical treatment. The simulated wastewater contained 1. 5 g / L 7-ACA、0. 5 g / L cephalosporins and 1 m L / L DMF,and the COD reached to 2 650 mg / L on average. The wet oxidation process consisted of WAO and WPO,while the biochemical process was SBR. According to results,the optimum operating condition of WAO was as followed: Temperature was 210 ℃ 、p H = 7、oxygen partial pressure was 2 MPa、reaction time was 3 h,and the COD removal rate reached to 67. 8%; the optimum operating condition of WPO was as followed: Temperature was 150 ℃ 、p H = 7、H2O2dosage was the theoretical value、reaction time was 1 h,the COD removal rate reached to 70. 8%. After the wet oxidation process and the SBR process,COD removal rate of the outlet water could reached to 80%,and the load of SBR could also be improved.