不同预处理方式对超滤膜深度处理印染废水效能影响的研究

以印染废水处理站的二级出水为原水,考察了不同预处理方式(砂滤、微絮凝、微絮凝直接过滤)对超滤膜性能及其去除印染废水中污染物的影响。结果表明,砂滤随着运行时间的延长造成膜的不可逆污染,微絮凝可缓解膜污染,微絮凝直接过滤对膜污染在微絮凝基础上有所改善;不同预处理方式均能保证出水浊度小于0.1NTU;微絮凝直接过滤预处理工艺对CODCr去除率接近70%,微絮凝直接过滤处理方法能有效缓解膜污染,对浊度和有机物的去除效果较好,是较有优势的预处理工艺。

Influences of pretreatment methods on advanced treatment of printing and dyeing wastewater by UF membrane

Taking the secondary effluent from a printing and dyeing wastewater treatment station as the experimental water,the influences of different preatment methods(sand filtration,microflocculation and microflo-cculation-direct filtration) on UF membrane performance and pollutants removal were investigated.The results showed that,along with time passing,sand filtration caused irreversible membrane fouling.The membrane fouling condition could be relieved by microflocculation,and be improved by microflocculation-direct filtration.All of the above pretreatment methods could ensure the effluent turbidity less than 0.1 NTU,the removal rate of CODCr by microflocculation direct filtration was close to 70%.Microflocculation-direct filtration could effectively relieve the membrane fouling,and had good turbidity and organic pollutants removal performance,which showed it was a good preatment process.