外电场促进生物厌氧与铁床耦合降解活性艳蓝研究

IMPROVEMENT OF ELECTRIC FIELD ON THE TREATMENT OF DYE BY ANAEROBIC BIOLOGICAL TECHNIQUE COUPLING WITH ZERO-VALENT IRON

采用生物厌氧与铁床耦合工艺处理蒽醌染料活性艳蓝KN-R,通过生物厌氧、生物厌氧与铁床耦合、耦合工艺施加外电场3种模式的对比,研究外加电场对促进该耦合工艺降解染料的效果以及影响因素。结果表明,单独生物厌氧的为活性艳蓝KN-R和COD去除率分别为11.86%和32.28%;生物厌氧与铁床耦合能显著提高活性艳蓝KN-R和COD去除率,分别达到65.64%和56.25%;耦合工艺施加外电场后,去除率在0.5V电压下分别达到90.92%、73.38%。单独厌氧的污泥对染料吸附量少,微生物也没有固定形态;与铁床耦合后的污泥开始以染料及中间产物作为吸附有机物,厌氧污泥区对去除活性艳蓝KN-R起主要作用;加入电场后,污泥微生物以螺旋菌为主,铁区对去除活性艳蓝KN-R其主要作用。加入电场后活性艳蓝KN-R去除率随硫酸钠含量增大而下降,在碱性条件下脱除率更高。

The treatment of reactive brilliant blue KN-R by anaerobic biological treament and anaerobic biological treatment coupling with zero-valent iron was tudied.Compared with single anaerobic treatment,anaerobic treatment coupling with zero-valent iron and external electric field imposed on coupling technique,the effect of electric field on this coupling technique and the influencing factor was studied.It shown that the decolorization ratio was 11.86% and ratio of COD elimination was 32.28% using single anaerobic treatment;the decolorization ratio and ratio of COD elimination were increased to 65.64% and 56.25% respectively using naerobic treatment coupling with zero-valent iron;while adding electric field,the decolorization ratio and ratio of COD elimination were increased to 90.92% and 73.38% at 0.5 V,respectively.The sludge of single anaerobic treatment had small amount of dye adsorption,and the microorganism did not have definite form;The sludge of naerobic treatment coupling with zero-valent iron began to adsorb dye and dye intermediate and anaerobic sludge area played an important role on the decolorization;When adding electric field,the microorganism formed as spirochete and the iron area played an important role on the decolorization.When adding electric field,the decolorization ratio dropped following the increase of the Na2SO4 econcentration,and the decolorization ratio was higher in alkaline condition.