尿醛预聚体改性木质素絮凝剂对重革废水的脱色效果

Tanned wastewater decoloured by lignin positiveion flocculant modified by carbamide and formaldehyde

在碱性条件下 ,利用尿、醛对木质素进行共混改性 ,在尿醛的摩尔比为 1∶1时 ,所合成的尿醛木质素絮凝剂用量为 70 0mg/L时 ,色度、COD去除率分别可达到 90 %与 80

On the condition of alkalescence,the mixing reaction along carbamide,formaldehyde(with thre same concentration)and lignin,the lignin flocculants modified by carbamide and formaldehyde are positive ions.The test results of tanned wastewater flocculated by the flocculant show that the removal ratio of colour or COD reaches 90% or 80%,when pH<6 and flocculant dosage 700mg/L.