电-Fenton法预处理干法腈纶生产废水

以Ti金属网为阴极,Ti基RuO2涂层形稳电极为阳极,采用外加H2O2和Fe2+的方式,研究了电-Fenton氧化预处理干法腈纶生产废水的工艺,考察了H2O2投加量、Fe2+投加量、pH值和电流强度等因素对污染物降解过程的影响,分析了废水可生化性和污染物变化规律。结果表明,电-Fenton法可以有效降解废水中有机污染物,使废水COD迅速降低,在初始pH值为3.0,Fe2+投加量为5.0 mmol/L,H2O2投加量为60.0 mmol/L,电流强度0.2 A的条件下,反应120 min后COD去除率可以达到44.0%以上;反应过程中H2O2的投加方式对电-Fenton法的处理效果具有明显影响,H2O2分6次投加可以使COD去除率由一次性投加时的44.8%提高至54.1%;处理后废水的BOD5/COD由0.29升高至0.68;GC-MS结果表明,经电-Fenton法预处理后,废水中多数芳香族化合物和特征污染物能被有效降解。

Pretreatment of dry-spun acrylic fiber manufacturing wastewater by electro-Fenton process

An electro-Fenton oxidation process using Ti sheet as cathode and RuO₂/Ti as anode was established for the pretreatment of dry-spun acrylic fiber manufacturing wastewater. The effects of initial pH value, c(H₂O₂), c(Fe²⁺) and current intensity on the removals of organic pollutants were investigated. The variations of biodegradability and organic pollutants were also analyzed. The results showed that the organic pollutants were degraded efficiently and the COD removal efficiency reached above 44.0% under the optimized conditions with initial pH value of 3.0, c(H₂O₂) of 60.0 mmol/L, c(Fe²⁺) of 5.0 mmol/L and current intensity of 0.2 A. The feeding mode of H₂O₂ had significant influence on COD removal efficiency: the removal efficiency was 44.8% if all the H₂O₂ were fed in one time, while it would reach 54.1% if the total H₂O₂ was divided into 6 portions and fed by 6 times. The BOD₅/COD ratio increased from 0.29 to 0.68 after 240 min treatment. GC-MS analysis showed that most of the aromatic and other typical organics were degraded in the electro-Fenton process.