【摘要】 退浆废水污染物含量占到整个印染废水的一半以上,其中含有聚乙烯醇(PVA)、聚羧酸酯(CMC)、变性淀粉等高分子浆料,可生化降解性差.以退浆废水实际体系为研究对象,从截留分子量、材质和表面性质多个角度对膜进行筛选和操作条件优化,确定截留分子量为50 000 Dalton的疏水性聚砜超滤膜适合于处理退浆废水;选定0.08 MPa,70℃为处理退浆废水适宜的操作条件.该条件下超滤膜对PVA和淀粉的截留率分别为96%和87%,化学耗氧量由23 000 mg/L降低到5 700 mg/L,COD去除率达到75%.先用pH值为13的NaOH溶液清洗,再用0.2 mol/L的H3BO3溶液清洗可以使通量恢复率达到97%.更多还原

【Abstract】 The COD value of desizing wastewater is more than 30 000 mg/L and the BOD/COD is only 0.05.The most COD of printing and dyeing wastewater is originated from desizing wastewater containing 1% PVA and 0.5% starch.The optimal UF membrane is fixed out on base of experimental result.It can be concluded that the hydrophilic PS membrane(MWCO=50 000 Dalton) is optimal for this system.It is optimal to treatment of desizing wastewater on the conditions of 0.08 MPa,70 ℃.The COD removal ratio can reach 75% and the rejection of PVA and starch is 96%,87%.The recovery of membrane flux can reach up to 97% using 90 ℃ H3BO3 and NaOH solution cleaning.更多还原