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纳米TiO2胶体絮凝-光催化氧化-砂滤深度处理造纸废水研究
Advanced Treatment of Paper-making Wastewater Using Nano-TiO2Colloid Coagulation, Photocatalyzed Oxidation and Sand Filtration Processes
收稿日期：  
DOI：10.11980/j.issn.0254-508X.2013.02.007
关键词:  造纸废水  絮凝  光催化氧化  砂滤
Key Words:paper-making wastewater  coagulation  photocatalyzed oxidation  sand filtration
基金项目:广东省部产学研结合专项资金项目(2007A090302069)。
作者单位
张洪鑫 华南理工大学制浆造纸工程国家重点实验室，广东广州，510640 
陈小泉* 华南理工大学制浆造纸工程国家重点实验室，广东广州，510640 
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摘要:研究了纳米TiO2胶体絮凝-光催化氧化-砂滤深度处理造纸废水的效果。分析了絮凝剂的选择和用量、光催化剂用量、光催化时间和外加氧化剂等对废水CODCr去除效果的影响；研究证实了样品中残留微量纳米TiO2胶体对CODCr测定的影响，并利用砂滤除去。实验结果表明，以用量为0.01%(相对于废水质量，下同)的纳米TiO2胶体为絮凝剂对经序列间歇式活性污泥法（SBR）处理后的造纸废水进行处理，在光催化剂用量（质量分数）0.05%，曝气并紫外光照射2 h时，沉降后的上层液体经过砂滤，废水CODCr从210 mg/L降到43.0 mg/L。
Abstract:In this article, advanced treatment of paper-making wastewater by nano-TiO2 colloid coagulation, photocatalyzed oxidation and sand filtration was studied. The experimental such as the types and dosage of coagulatants, dosage of photocatalysts, illumination time and external oxidants were investigated. The results indicated that residual nano-TiO2 which can be removed by sand filtration will affect the determined CODCr value. When the wastewater was pretreated by using 0.01% (on wastewater weight) nano-TiO2 as a coagulatant, then further treated by UV irradiation for 2 hours with using 0.05% nano-TiO2 as photocatalyst and under aeration, the upper water after sedimentation passed through sand filtration, the CODCr of the final effluent decreased from 210 mg/L to 43mg/L.
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