铁碳微电解-Fenton法预处理苯胺基乙腈生产废水

Pretreatment of N-phenylglycinonitrile wastewater by combining iron-carbon micro-electrolysis with Fenton reagent

采用铁碳微电解-Fenton法对苯胺基乙腈生产废水进行预处理实验。通过静态实验确定铁碳微电解最佳条件为铁屑投加量300 g/L,Fe/C质量比为2∶3,反应75 min,不需要调节进水pH;Fenton反应最佳条件为铁碳微电解出水pH=4,30%H2O2投加量15 mL/L,在搅拌条件下反应60 min;然后沉淀反应时调节pH为9,混凝沉淀75 min。在上述条件下通过动态实验得到系统连续反应在48 h内废水的COD和苯胺去除率在50%和70%以上,可生化性BOD5/COD也保持在0.3以上,为后续生物处理创造了良好条件。

Fe-C micro-electrolysis with Fenton reagent was adopted to pretreat the N-phenylglycinonitrile wastewater. The static tests showed that the best operational conditions of Fe-C micro-electrolysis reactions were as follows： the scrap iron dosage of 300 g/L, the Fe-C mass ratio of 2/3, the reaction time of 75 min; in Fenton reactions the pH was 4, the 30% H2O2 addition was 15 ml/L, the stirring reaction time was 60 min; then in precipitation reactions the pH was adjusted to 9, the precipitation time was 75 min. In the dynamic tests under the above conditions, the removal rates of COD and anilines could reach 50% and 70%, respectively, and the BOD5/COD also remained at 0.3. All these have suggested that the pretreatment of N-phenylglycinonitrile wastewater can create good conditions for the follow-up biological treatment by combing Fe-C micro-electrolysis with Fenton reagent.