海绵铁对印染废水脱色研究

Study on Decoloration Efforts of Printing and Dying Wastewater with Spongy Iron

海绵铁脱色是电化学、氧化还原、电场作用、絮凝沉淀以及物理吸附等的共同作用。实验结果表明 :海绵铁对色度的吸附过程符合Freundlich等温式。研究了海绵铁对几种不同颜色废水的脱色情况 ,海绵铁对酸性金黄、酸性藏蓝以及大红色染料都有较好的脱色效果 ,脱色率在 90 %以上 ;对耐晒黑染料的脱色效果相对较差为 80 %左右。同时通过几种影响因素的研究 ,确定了脱色的最佳实验条件。并在实际废水中得到了有效的验证 ,当滤速为 6m/h时 ,脱色率可达到

The mechanism based on the combined action of electrochemistry, oxidation-reduction, flocculation and physical adsorption. Test result showed that the adsorption process of spongy iron for color accords with Freundlich isotherm. Study on the decolorization effect for different color wastewater with spongy iron, the removal rate of acidic golden, navy blue and red dye wastewater may exceed 90%, black dye wastewater removal efficiency 80%. It finds the best treatment condition that can be efficiently used. When velocity of wastewater is 6m/h,the removal rate of dying may be over 94%.