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。
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 eoagulatants, 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 de-termined CODcr value. When the wastewater was pretreated by using 0.01% （on wastewater weight） nano-TiO2 as a coagulatant, then fur-ther treated by UV irradiation for 2 hours with using 0.05% nano-TiO2 as photocatalyst and under aeration, the upper water after sedimenta-tion passed through sand filtration, the CODc, of the final effluent decreased from 210 mg/L to 43mg/L.
出处
《中国造纸》
CAS
北大核心
2013年第2期30-35,共6页
China Pulp & Paper
基金
广东省部产学研结合专项资金项目(2007A090302069)
关键词
造纸废水
絮凝
光催化氧化
砂滤
paper-making wastewater
coagulation
photocatalyzed oxidation
sand filtration
