Fenton强化微电解工艺处理靛蓝牛仔布印染废水研究

研究了铁炭微电解-Fenton试剂作用下靛蓝牛仔布印染废水的脱色和COD去除行为,通过正交试验和单因素试验确定了微电解-Fenton反应的最佳操作条件,分析了各影响因子的作用机理。结果表明:在铁炭质量比为2∶1,pH值为3的条件下反应90 min,铁炭微电解出水COD的去除率在49.20%,色度去除率达到80%,BOD5/COD值由0.248上升至0.436,可生化性提高;微电解出水在pH值为5,H2O2投加量为0.3%条件下反应60 min后,COD去除率可达84.1%,色度去除率达90%,BOD5/COD值上升至0.525;铁炭微电解-Fenton组合工艺COD的总去除率为87.26%。

Study on the sewage residue from dyeing indigo-jeans by ferric-carbon micro-electrolysis and Fenton reagent

The present paper is engaged in a study on the sewage residue from dyeing indigo-jeans by ferric-carbon micro-electrolysis and Fenton reagent.As is known,ferric-carbon micro-electrolysis and Fenton reagent are commonly used in pre-treating printing and dyeing sewage.For our research purpose,we have done a series of combined orthogonal experiments and the single factor experiment through the micro-electrolysis and Fenton and worked out the optimal operating conditions of COD and color removing effects.And,then,we have analyzed the mechanism of the affecting factors.The optimal conditions we have established through experiments can be stated as follows: the volume ratio of iron to carbon is equal to 2:1,the influent pH value is 3,the ferric-carbon micro-electrolysis aeration time is 90 min.We have also enhanced the removal of COD and color,which can reach about 49% and 80%.When the treatment is over,we have found that the BOD5/COD could be heightened from 0.248 to 0.436,with the biodegradability being improved.In addition,we have also found that Fe2+ and ·OH could be generated at low cost by effective combination of micro-electrolysis and Fenton,which helps to overcome high cost and waste in Fenton reaction.Moreover,our study has also found the best operating conditions for Fenton reaction system: pH=5,dosage of H2O2=0.3%,and reaction time=60 min.Under such conditions,the removal rate of COD and color could be promoted to 84% and 90% respectively,the BOD5/COD would increase to 0.525.The total removal of COD could reach about 87% by the micro-Fenton method.For all the discovery and conclusion,the results of this study can serve as an important reference to the practical application of micro-Fenton method in processing printing and dyeing sewage.