【摘要】 针对油田开采后期,污水成分复杂且各种常规水处理方法都有其局限性的问题,提出了水力空化技术与臭氧氧化技术联合工艺处理污水的设想。利用臭氧氧化与空化效应,采用多孔孔板建立了水力空化污水处理系统,对油田现场污水进行了尝试性的试验研究。分别对水力空化和臭氧各自单独降解与两者联合降解水样COD的效果作了对比分析。结果表明,孔板入口压力在0.19MPa附近以及系统的进气量在70L/h时COD的去除率相对较高;水力空化与臭氧联合降解的效果明显优于两者单独降解的效果;同时说明水力空化与臭氧在降解COD过程中存在互相强化的关系,孔板型空化水处理系统对降低油污水的COD含量具有一定的作用,但效率并不高,但对分析水力空化技术作为油田污水辅助处理技术的可行性,有一定参考价值。更多还原

【Abstract】 In the late stage of oilfield development, the wastewater has a complicated composition, which renders conventional water treatment methods unsatisfactory. To solve this problem, a method of using jointly hydrodynamic cavitation and ozone in degrading oilfield wastewater is proposed in this paper. A wastewater treatment system using hydrodynamic cavitation was built with the structure of a multi -hole orifice based on the theory of ozone oxidation and cavitation effect, and tests were made on oilfield wastewater from a working site. The Chemical Oxygen Demand (COD) of oilfield wastewater with treatment of hydrodynamic cavitation combined with ozone was determined. The effects of using hydrodynamic cavitation and ozone oxidization separately or combined in reducing the CODof oilfield wastewater were analyzed and compared. The experimental results show that the effects are better by using hydrodynamic cavitation combined with ozone than by using just one of them. The effects are the best when the orifice inlet pressure is about 0.2 MPa and when the air intake is about 70 L an hour. It is also shown that there are mutual enhancing effects between hydrodynamic cavitation and ozone in the process of degrading oilfield wastewater. The orifice device has a certain role in decreasing COD of oilfield wastewater, but with a ratio not very high. This investigation provides some guidance for analyzing the feasibility of using hydrodynamic cavitation as a supplemental treatment technology for oilfield wastewater.更多还原