纳米铁强化絮凝/砂滤/超滤工艺深度处理印染废水

Advanced Treatment of Printing and Dying Wastewater Using Nanoscale Iron Enhanced Flocculation/Sand Filtration/UF Combined Process

采用絮凝/砂滤/超滤组合工艺对印染废水二级出水进行深度处理,考察了该工艺的除污效果,并对运行参数进行优化;同时,采用纳米铁与新型复合絮凝剂高效聚合氯化铝(HPAC)进行复合投加,以GC/MS进行有机物全分析,研究纳米铁对尾水中有毒有害有机物的削减作用。结果表明,絮凝/砂滤能够减轻超滤膜的负荷,延缓膜污染,是一种较优的预处理工艺。该工艺的运行周期可达8 h,超滤出水浊度<0.1 NTU、COD<25 mg/L,出水水质满足《城市污水再生利用工业用水水质》(GB/T 19923—2005)的要求。纳米铁与絮凝剂的复合投加对有毒有害有机物具有一定的削减作用,用于印染废水的脱毒减排具有良好的前景。

Flocculation/sand filtration/UF combined process was used for advanced treatment of secondary effluent of printing and dying wastewater. The treatment efficiency and optimal operation conditions were investigated. The nanoscale iron and HPAC flocculant were added at the same time to enhance the toxic organics removal. GC/MS was used for the screen analysis of the organic compounds in the effluent. The results showed that flocculation/sand filtration as a pretreatment process could greatly reduce the subsequent ultrafiltration load and slow down the membrane fouling. The operational cycle time of this process could reach 8 h, and the effluent turbidity and COD were less than 0.1 NTU and 25 rag/L, respectively. The effluent quality could meet the Reuse of Urban Recycling Water -- Water Quality Standard for Industrial Uses （ GB/T 19923 - 2005 ）. It was concluded that dosing nanoscale iron and HPAC flocculant assisted the reduction of toxic organic substances in the advanced treatment of printing and dying wastewater.