某制药厂废水的处理研究

Study on Treatment of Wastewater from a Pharmaceutical Factory

制药废水化学需氧量(COD)值高,生化需氧量/化学需氧量(BOD/COD)值小,无法直接进行生化处理。依据废水特点,采用Fenton氧化法对废水进行预处理后再进行生化处理。实验结果表明,Fenton氧化法处理废水的最佳条件为:5%FeSO4溶液的用量为40mL/L、溶液pH为1、H2O2溶液的用量为4mL/L、搅拌速率为150r/min,反应时间为20min。此时,COD去除率达到最高,为41%;原水直接生化处理时COD的去除率为21%,原水预处理后再生化处理,其COD去除率达到68%。Fenton氧化法对废水的预处理大大提高了废水的可生化性。

The pharmaceutical wastewater can not directly perform biochemical treatment because of high chemical oxygen demand (COD) value and low biochemical oxygen demand/chemical oxygen demand (BOD/COD) value. According to these characteristics, Fenton oxidation method was applied to pretreat the wastewater before biochemical treatment, the optimal conditions of Fenton oxidation were as follows: the dosage of 5% FeSO4 solution was 40 mL/L, the solution pH was1, the dosage of H2O2 solution was 4 mL/L, the stirring rate was 150 r/min, and the reaction time was 20 min. Under above conditions, the highest COD removal rate was 41%. The COD removal rate by direct biochemical treatment was 21% and that reached 68% by biochemical treatment after pretreated. It could be concluded that the pretreatment of wastewater by Fenton oxidation method greatly improved the biodegradability of wastewater.