采用活性炭强化常规处理原水突发油类污染的研究

Study on activated carbon enhanced conventional water purification against emergent oil pollution of raw water

中试研究表明,常规处理(混凝—沉淀—过滤)可以将含油约为10mg/L的原水处理达标,并且除油率不受混凝剂投加量的影响。油污染浓度为7.2～18mg/L的原水经混凝沉淀去除的效率基本相同。20mg/L的油污染仅通过常规处理无法达标,需采用投加粉末活性炭(PAC)的强化混凝或颗粒活性炭(GAC)的强化过滤,即投加40mg/L的PAC,或在过滤阶段铺40cmGAC层的炭砂滤柱。KMnO4和Cl2的预氧化对除油效果无影响。

Pilot experiment indicated that the conventional water purification processes of coagulation-sedimentation-filtration could get normal outflow quite enough to meet the requirement of water quality standard in time when the oil concentration in the raw water was 10 mg/L around. In this case the oil purification is not correlated to the coagulant dose. However, even when the oil content fallen in range of 7.2 to 18 mg/L, normal outlet water could be gotten by the routine coagulation-sedimentation process. When oil content increased to 20 mg/L or more, the conventional process gone to incapable, so the PAC enhanced coagulation or GAC enhanced filtration has to be needed. If 40 mg/L PAC was added, the sedimentation outflow was eligible. In case when PAC enhancement was absent, the sedimentation outflow was eligible when a GAC layer with depth of 40 cm was added to the filter. Preoxidation of KMnO4 or Cl2 had no influence on oil removal.