氧化剂与新型絮凝剂协同去除酸性大红的研究

Removal of Acid Brilliant Scarlet by the Synergistic Effect of Oxidant and New Flocculant

选取浓度为25mg/L的酸性大红-GR溶液为模拟染料废水,采用氧化-絮凝耦合工艺,探索了氧化剂种类、絮凝剂种类、废水pH值、氧化剂和絮凝剂投加量对氧化-絮凝耦合处理酸性大红染料的影响,确定最佳处理条件为:酸性大红溶液初始pH值不变,高锰酸钾和PTSS的投加量分别为为20mg/L和10mg/L(以钛离子计),脱色率和COD去除率均最大,分别为96.3%、56.5%。通过FTIR光谱扫描、絮体的显微形貌观察、酸性大红和新型絮凝剂聚硅硫酸钛(PTSS)的表面电动电位随pH值的变化的测定,分析了氧化-絮凝耦合法的反应历程:高锰酸钾破坏酸性大红的发色基团后,自身被还原成新生态二氧化锰胶体;二氧化锰胶体吸附酸性大红及其氧化产物,并被无机高分子絮凝剂PTSS通过电中和及架桥网捕等作用卷裹成絮体。

Dyestuff wastewater which is simulated by Acid Scarlet GR （25mg/L） was treated by coupled flocculation and oxidation process. The influence of oxidant species, flocculant species, wastewater pH value, dosage of oxidant and flocculant was investigated, then the optimal operating conditions were determined, adding 20mg/L potassium permanganate and 10mg/L PTSS when the initial pH value of Acid Scarlet GR is unchanged, treatment effect is optimization and, the color and COD removal rates reached 96.3% and 56.5%. The reaction mechanism of coupled flocculation and oxidation process were also studied through infrared adsorption spectrum, morphology of aggregates, particle size disuibution of flocculant, zeta potential of wastewater and poly-titanic-silicic sulfate. Results show that acid brilliant scarlet GR is oxidized into small organic molecules by potassium permanganate, then small organic molecules are adsorbed by the reduction product newly formed hydrous manganese dioxide, which is enwrapped by charge neutralization and adsorption bridging action of poly-titanic-silicic sulfate in the next step.