化学原料制药废水生化前处理试验研究

Experimental research on biochemical pretreatment of chemical raw material pharmaceutical wastewater

某制药厂回收工段产生大量化学原料残液,COD达到70000~75000 mg/L,可生化性极差。采用铁碳微电解法分别联合Fenton法和过硫酸盐高级氧化法对其进行预处理。结果表明,当微电解初始pH为5.60、填料用量为750 g/L、停留时间为120 min、过硫酸盐高级氧化初始pH为3.78、Fe2+投加量为1.30 g/L、过硫酸氢钾复合盐投加量为5.02 g/L、反应时间为110 min时,该工艺的COD去除率可达到74.51%,且废水的B/C由0.14提升到0.43,可生化性显著改善。

A large number of chemical raw material residual liquids were produced in the recycling section of a pha-rmaceutical factory,the COD of which reached 70000-75000 mg/L,with extremely poor biochemical properties.It was pretreated by iron-carbon micro-electrolysis method combined with Fenton method and persulfate advanced oxi-dation.The results showed that the COD removal rate could reach 74.51%with the initial pH of micro-electrolysis 5.60,filler dosage 750 g/L,the retention time 120 min,the initial pH of persulfate advanced oxidation 3.78,Fe2+dosage 1.30 g/L,potassium persulfate composite salt dosage 5.02 g/L,and the reaction time 110 min.Simultaneously,the B/C of wastewater was increased from 0.14 to 0.43,and the biodegradability was significantly improved.