碱性破乳-Fenton氧化工艺预处理三烯丙基异氰脲酸酯(TAIC)生产废水

Pretreatment of triallyl isocyanurate( TAIC) production wastewater by alkaline demulsification-Fenton oxidation process

三烯丙基异氰脲酸酯(TAIC)作为一种性质稳定难于生化降解的化合物而危害环境,其生产废水不容易被电化学、高级氧化或吸附方法得以高效处理。采用一种简易高效的碱性破乳法结合Fenton氧化工艺来处理TAIC生产废水,并考察了碱性破乳中的反应温度和pH值以及Fenton氧化中的H_2O_2投加量、n(H_2O_2)/n(Fe^(2+))、反应时间和反应pH值对处理效果的影响。结果表明:在最佳的碱性破乳条件(反应温度为60℃,pH值为12)下,COD去除率可以达到46.4%以上,TAIC去除率可以达到70.3%以上,同时可以使浊度和盐度大幅度降低;在最佳的Fenton氧化条件(H_2O_2投加量为7 g L-1,n(H_2O_2)/n(Fe^(2+))为3∶1,反应时间为40 min,初始pH值为3.5)下,COD去除率可以达到49.6%,B/C比提高到了0.36。碱性破乳法可以使TAIC直接从水中大量析出,是一种绿色环保的清洁工艺。该组合工艺可以有效地削减后续进入生化反应的负荷。

Triallyl isocyanurate（ TAIC） is a stable compound that is difficult to degrade using biochemical methods. Furthermore,TAIC in wastewater cannot be efficiently treated by electrochemistry,advanced oxidation,or adsorption processes. This study adopted a simple and effective alkaline demulsification method combined with the Fenton oxidation process to treat TAIC in wastewater. The factors that influenced the treatment were studied,including reaction temperature,the pH in the alkaline demulsification,H_2O_2 dosage,ratio of H_2O_2 to Fe^（2 ＋）,reaction time,and the pH in the Fenton oxidation process. The results were as follows： using optimal conditions for alkaline demulsification（ reaction temperature = 60 ℃,pH = 12）,the removal rates of COD and TAIC reached over 46. 4% and 70. 3%,respectively,while the turbidity and salinity also significantly reduced; using optimal conditions for the Fenton oxidation process（ H_2O_2 dosage = 7 g·L-1,n（ H_2O_2） /n（ Fe2 ＋）= 3 ∶ 1,reaction time = 40 min,initial pH = 3. 5）,COD removal rate could reach 49. 6% and BOD5/ COD（ B /C） could reach 0. 36. In this study,alkaline demulsification could directly separate TAIC from wastewater,making it a green and cleaner process. The combined process could also effectively reduce the load of subsequent biochemical reactions.