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为了同时去除某油田三元采出液中的浊度和油分,采用混凝-微气泡气浮工艺进行预处理。拟从常用的混凝剂中确定经济高效的混凝剂和适宜的混凝条件。结果表明,聚氯化铝(PAC)混凝剂在碱性条件下,对油田采出废液的处理效果较好。通过探讨混凝剂添加量、气浮处理时间和微气泡发生器工作压力对混凝-微气泡气浮效果影响,获得了较适宜的工艺条件,即PAC添加量50 mg/L,混凝气浮处理15 min,工作压力0.4 MPa,此时浊度去除率和油分去除率分别为46.1%和82.2%。混凝-微气泡气浮的油分去除率比单独混凝沉降和单独微气泡气浮处理的油分去除率之和高出27.7个百分点,说明混凝和微气泡气浮2者之间存在着协同作用,可减少混凝剂的用量。
In order to remove the turbidity and oil content in the ternary recovery fluid of an oilfield at the same time, the coagulation-microbubble flotation process was used for pretreatment. It is proposed to determine cost-effective coagulants and suitable coagulation conditions from commonly used coagulants. The results show that polyaluminum chloride (PAC) coagulant under alkaline conditions, the oilfield waste water treatment effect is better. By investigating the influence of coagulant dosage, flotation time and the working pressure of microbubble generator on the flotation effect of coagulation-microbubble, more suitable process conditions were obtained, namely PAC addition amount 50 mg / L, coagulation gas Float treatment 15 min, working pressure 0.4 MPa, turbidity removal and oil removal rates were 46.1% and 82.2% respectively. The removal rate of coagulation-microbubble flotation is 27.7% higher than that of coagulation alone and microbubble flotation, which shows that there is synergy between coagulation and microbubble flotation Role, can reduce the amount of coagulant.