实验研究了某油田联合站稠油采出水的COD_Cr构成,初步探明了COD_Cr难以处理的原因,并提出了降低COD_Cr的对策。结果表明,该联合站污水COD_Cr主要由油和水中残留的各种化学药剂构成,对于新鲜污水,二者对COD_Cr的贡献分别为 6 0.7%和 39.3% ;油对COD_Cr的贡献可采用方程COD_Cr=4.3912X +0.6 171(X为油含量,mg/L)来定量表征 ;污水中残留的在采油作业或地面作业时使用的各种化学药剂是其COD_Cr难以达标的主要原因。药剂的生化降解性能或水处理剂对污水中残留药剂的选择去除效果是影响COD_Cr处理结果的重要原因。

The COD_Cr composition of heavy oil effluent has been studied, and the reason of the hardness of its treatment has been discussed.A novel method of COD_Cr treatment is given.The results show that the COD_Cr of heavy oil effluent is composed of organic chemical agentswhich are left from oil and water.For fresh effluent the COD_Cr percentages of oil and chemical additives are 60.7 %and 39.3%respectively.The equation,COD_Cr=4. 391 2X +0.617 1,can express the oil content contribution to COD_Cr.The main reason of the hardness of COD_Cr treatment exists in the disposal difficulty of chemical additives in the effluent.The selective flocculation effect of the biodegradation by the complex flocculant is proved to be feasible