Guvenc Senem Yazici, Erkan Hanife Sari, Varank Gamze, Bilgili Mehmet Sinan, Engin Guleda Onkal
Department of Environmental Engineering, Yıldız Technical University, Davutpasa Campus, Esenler, Istanbul 34220, Turkey E-mail:
Water Sci Technol. 2017 Oct;76(7-8):2015-2031. doi: 10.2166/wst.2017.327.
This study deals with chemical oxygen demand (COD), phenol and Ca removal from paper mill industry wastewater by electrocoagulation (EC) and electro-Fenton (EF) processes. A response surface methodology (RSM) approach was employed to evaluate the effects and interactions of the process variables and to optimize the performance of both processes. Significant quadratic polynomial models were obtained (R = 0.959, R = 0.993 and R = 0.969 for COD, phenol and Ca removal, respectively, for EC and R = 0.936, R = 0.934 and R = 0.890 for COD, phenol and Ca removal, respectively). Numerical optimization based on desirability function was employed; in a 27.55 min trial, 34.7% of COD removal was achieved at pH 9 and current density 96 mA/cm for EC, whereas in a 30 min trial, 74.31% of COD removal was achieved at pH 2 and current density 96 mA/cm and HO/COD molar ratio 2.0 for EF. The operating costs were calculated to be 6.44 €/m for EC and 7.02 €/m for EF depending on energy and electrode consumption at optimum conditions. The results indicate that the RSM is suitable for the design and optimization of both of the processes. However, EF process was a more effective technology for paper mill industry wastewater treatment as compared with EC.
本研究探讨了采用电凝聚（EC）和电芬顿（EF）工艺去除造纸工业废水中的化学需氧量（COD）、苯酚和钙。采用响应面法（RSM）评估工艺变量的影响和相互作用，并优化这两种工艺的性能。得到了显著的二次多项式模型（EC去除COD、苯酚和钙的R分别为0.959、0.993和0.969，EF去除COD、苯酚和钙的R分别为0.936、0.934和0.890）。采用基于合意函数的数值优化方法；在27.55分钟的试验中，EC在pH为9、电流密度为96 mA/cm²时，COD去除率达到34.7%，而在30分钟的试验中，EF在pH为2、电流密度为96 mA/cm²且H₂O₂/COD摩尔比为2.0时，COD去除率达到74.31%。根据最佳条件下的能源和电极消耗计算，EC的运行成本为6.44 €/m³，EF的运行成本为7.02 €/m³。结果表明，RSM适用于这两种工艺的设计和优化。然而，与EC相比，EF工艺是处理造纸工业废水更有效的技术。
