摘要
采用O3和O3/H2O2氧化法对某制药厂的制药废水进行氧化处理,主要考察废水的pH值、O3流量、反应时间对COD去除率的影响。结果表明,O3氧化法的最佳条件为:废水的pH值为9.00,O3流量为5 g/h,反应时间为90 min。在此条件下,废水的COD和TOC的去除率分别达到64.16%和75.34%。O3/H2O2氧化法更能有效的提高废水COD和TOC的去除率,但需要合适的H2O2投加量。处理后两者去除率分别达87.45%和91.49%,且处理后的COD值(351 mg/L)符合该厂排入市政管网的要求(500 mg/L),同时废水的可生化性提高,B/C由0.12提高至0.32。对O3/H2O2处理制药废水的反应机制研究表明,COD的去除率随自由基抑制剂浓度的增加而降低,COD的去除主要是体系中.OH的贡献。另外,采用COD和TOC结合起来作为评价指标更能准确的反映出制药废水中有机物的去除规律。
Pharmaceutical wastewater from a pharmaceutical factory was treated by O3 and O3 /H2O2 oxidation,effects of pH,ozone flow and reaction time on removal rate of COD were mainly investigated.Results showed that under the optimal conditions of pH value 9.00,ozone flow 5 g/h and reaction time 90 min,the removal rate of COD and TOC were 64.16% and 75.34% respectively by O3 oxidation.O3 /H2O2 oxidation was more effective for increasing removal rates of COD and TOC,but appropriate dosage of H2O2 was needed.After the treatment,removal rate of the both were up to 87.45% and 91.49% respectively,COD of 351 mg/L could also meet the requirement of municipal pipe network of 500 mg/L.The biodegradability of wastewater was also improved,with B/C increased from 0.12 to 0.32.Reactive mechanism suggested that removal rate of COD was decreased with increasing of radical inhibitors concentration,and the removal of COD was mainly owing to hydroxyl free radical produced by O3 /H2O2 process.The combination of COD and TOC as an evaluating indicator more exactly reflected the removal rule of organics in the pharmaceutical wastewater.
出处
《环境科学与技术》
CAS
CSCD
北大核心
2011年第3期85-89,共5页
Environmental Science & Technology
