Efficient alleviation of ultrafiltration membrane fouling in treatment of dye effluent by a novel cationic dendritic starch-based flocculant
简介：Dye effluent has become a challenging problem in wastewater treatment.Ultrafiltration(UF)is a popular method to purify dye effluent,but membrane fouling is a major problem seriously restricting its wide applications.A novel cationic dendritic starch-based flocculant(CL-CS-G)was designed and fabricated.The performance and mechanism of CL-CS-G in alleviation of membrane fouling during the successive flocculation-UF treatment of Acid Green 25 effluent,a typical industrial dye,were evaluated.Compared with polyaluminum chloride(PAC),CL-CS-G showed a lower loss of water flux but a less required dosage,besides,this dendritic flocculant could effectively reduce both reversible and irreversible fouling,and its irreversible fouling resistance was even reduced by 91.2％,because of its distinct structural feature.The hyperbranched structure of CL-CS-G,with relatively loose and net-like configuration but also abundant reactive end-groups contained,caused higher bridging and sweeping flocculation effects in addition to charge neutralization;moreover,produced larger but looser dye flocs,than PAC and its linear analogue,resulting in a looser and porous cake layer,more easily cleaned up,and thus a higher efficiency in alleviation of membrane fouling.The high performance of CL-CS-G in flocculation and alleviation of membrane fouling was confirmed by its high economical efficiency,good reusability of the treated membrane,and effective purification of two other dye effluents and a simulated real dye mixture.CL-CS-G is an efficient,low cost and environmental-friendly flocculant,and thus has high application potentials in pretreatment of dye effluents and alleviation of membrane fouling.展开
学者：YUYANGWangWenxiaoRenHUYang
关键词：Membrane fouling controlFlocculation pretreatmentDye effluentDendritic starch-based flocculantAlleviation performance and mechanisms
在线出版日期：2026-05-11 （网站首发日期）
