铁碳微电解预处理甲硝唑制药废水

Pretreatment of Metronidazole Pharmaceutical Wastewater by Iron-carbon Micro-electrolysis

为提高甲硝唑制药废水的可生化性、降低COD,对铁碳微电解工艺预处理甲硝唑制药废水进行了研究。首先,在静态烧杯试验中通过正交实验设计和单因素试验探索废水初始pH值、曝气量和反应时间3个工艺参数最优值,结果表明,废水pH值为3、曝气量为15.0L/min、反应时间为120min时废水COD去除率最高,达到38.4%。之后,在静态烧杯试验结果的基础上进行了连续动态试验,连续动态试验考察了不同固液比和废水COD浓度对COD去除效率的影响,发现增加微电解反应柱中固液比能提高COD去除率,而废水COD浓度对COD去除率的影响不大。最后生化验证试验中验证了铁碳微电解预处理提高了废水的可生化性以及预处理工艺的稳定性。

In order to improve the biodegradability of metronidazole pharmaceutical wastewater and reduce COD, the pretreatment of metronidazole pharmaceutical wastewater by iron-carbon micro-electrolysis was studied. Firstly, in the static beaker test, the optimal values of three initial process parameters, such as initial pH value, aeration amount and reaction time,were explored by orthogonal experimental design and single factor test. The results showed that when the initial pH value was3.0, the aeration rate was 15.0 L/min with the reaction time for 120 min, the COD removal rate of wastewater was the highest,reaching 38.4%.Then, based on that results, continuous dynamic test was carried out to investigate the effects of different solid-liquid ratio and initial COD concentration on COD removal efficiency. It was found that increasing the solid-liquid ratio in the micro-electrolytic reaction column could improve the removal rate of COD, while the influence of initial COD concentration was not significant. Finally, in biochemical treatment test, it was shown that the pretreatment can improve the biodegradability of wastewater and the stability of pretreatment process.