二次纤维造纸污水的絮凝-光催化处理  

Flocculation-Photocatalysis Treatment of Secondary-Fiber Papermaking Wastewater

作　　者：沈文浩[1] 宁利[1] 陈小泉[1] 李翠翠[1] 

机构地区：[1]华南理工大学制浆造纸工程国家重点实验室,广东广州510640

出　　处：《华南理工大学学报（自然科学版）》2011年第6期90-94,共5页Journal of South China University of Technology(Natural Science Edition)

基　　金：国家自然科学基金资助项目(61074109)

摘　　要：以钛氧有机物水解法制备的TiO2胶体为絮凝剂和光催化剂,对二次纤维造纸厂的混合污水进行了胶体絮凝-光催化处理,并对絮凝机理以及光催化反应的最佳条件进行了探讨.研究表明:平均粒径为13.5 nm的TiO2胶体粒子具有良好的光催化活性;在pH值为4、TiO2用量(纯TiO2质量分数)为0.025%的条件下对污水进行絮凝处理,然后在pH值为3、TiO2用量为0.050%的条件下进行光催化处理时,水样COD从909.7 mg/L降至103.0 mg/L,总的COD去除率为88.7%;TiO2胶体对污水中细小纤维与胶粘物粒子的絮凝主要是依靠纳米粒子在细小纤维和胶粘物质之间的架桥作用;在光催化过程中,反应前期TiO2胶体具有高的COD去除率,6 h后反应趋于平缓;该造纸污水光催化剂用量少,能回收再利用,可有效降低能耗及水处理成本.In this paper,the flocculation-photocatalysis treatment of the mixed wastewater from secondary-fiber paper mill was carried out,with TiO2 colloid prepared by the hydrolysis of titanyl organic compound as the flocculant and the photocatalyzer.Then,the flocculation mechanism of TiO2 colloid and the optimal photocatalysis conditions were investigated.The results indicate that（1） TiO2 colloid particles with the average diameter of 13.5 nm is of high photocatalytic activity;（2） when the flocculation performs at a TiO2 dosage of 0.025%（mass fraction） with a pH value of 4,and when the photocatalysis performs at a TiO2 dosage of 0.050% with a pH value of 3,the COD of wastewater sample decreases from 909.7mg/L to 103.0mg/L,and the total COD removal reaches 88.7%;（3） the flocculation of TiO2 colloid is mainly due to the bridging between TiO2 colloid and the fine fibers as well as the dissolved colloidal substances（DCS） in the wastewater;（4） the COD removal of TiO2 colloid is high in the earlier stage of photocatalysis,and then slowly changes after 6 hours;and（5） TiO2 colloid is a kind of reusable photocatalyzer and a small dosage of it helps to reduce the energy consumption and the cost of wastewater treatment.

关 键 词：二氧化钛胶体 污水处理 絮凝 光催化 

分 类 号：X506[环境科学与工程—环境工程] TQ085[化学工程]