印染废水CWAO法处理中均相催化剂的研制

为了制备用于催化湿式氧化法处理高浓度印染废水的催化剂,实验中以COD达2 000 mg.L-1的亚甲蓝水溶液作降解对象,用均相催化湿式氧化法进行处理,催化剂性能以COD去除率和脱色率进行评价.在对19种可溶盐进行普选的基础上,对双组分催化剂进行复配.结果表明:铜盐和铁盐的催化活性居于前列,而硫酸铜和硫酸亚铁复配的Cu1Fe1催化剂在活性和成本上显示了优越性,同等条件下对水样的COD去除率比不加催化剂时提高约50%.对Cu1Fe1的作用机理分析表明,自由基反应以及Fe(Ⅲ)聚合物的混凝同时发挥了作用.

Preparation of Homogeneous CWAO Catalysts to Treat Dyeing-Printing Wastewater

To prepare the CWAO catalysts to treat high-concentration dyeing-printing wastewater, an experiment was done to degrade the methylene blue aqueous solution as sample, of which the COD value is up to 2000 mg·L^-1, with homogeneous CWAO process. The performance of those catalysts was evaluated with COD removal rates and decoloring rates. Among the 19 kinds of soluble salts, some double-component catalysts were chosen and resynthesized. The results showed that the leading catalytic activity is of copper/iron salt, while the Cu1Fe1 catalyst resynthesized by copper sulphate and ferrisulphas is superior in both activity and cost and its COD removal rate in the sample wastewater increases by about 50% in comparison to that without the catalyst used. The mechanism analysis of Cu1Fe1 catalyst shows that the free-radicle reaction and coagulation of Fe (III) polymer both function simultaneously.