Wang Ce, Lü Yuling, Song Chao, Zhang Dechong, Rong Feng, He Limin
College of Pipeline and Civil Engineering, China University of Petroleum (East China), Shandong, Qingdao 266580, China.
College of Pipeline and Civil Engineering, China University of Petroleum (East China), Shandong, Qingdao 266580, China.
Sci Total Environ. 2022 Nov 1;845:157304. doi: 10.1016/j.scitotenv.2022.157304. Epub 2022 Jul 14.
The development and production of oil and gas fields would eventually result in a considerable amount of oily generated water, posing serious risks to humans and the environment. Nowadays, the oil concentration in the drainage stream of the produced water is strictly regulated, and many countries have established strict emission standards. As an indispensable oily wastewater treatment technology, flotation technology has attracted much attention because of its maturity, economy, practicality, and relative efficiency. Firstly, this paper summarizes and compares flotation techniques, such as dissolved gas flotation, induced gas flotation, electroflotation, and compact flotation units widely used in produced water treatment offshore in recent years. Considering the complexity of the mechanism of oil removal by air flotation, the mechanism of the oil droplet-bubble interaction is further discussed. The effects of flocculant, PH, and salinity on the oil droplet-bubble interaction in the flotation process were summarized from the perspective of the microscopic colloidal interface, which has a specific guiding role in improving the oil removal efficiency in the gas flotation process. Finally, the research status of produced water treatment by air flotation is summarized, and the feasible research direction is put forward.
油气田的开发和生产最终会产生大量含油采出水，对人类和环境构成严重风险。如今，采出水中排水流的含油浓度受到严格监管，许多国家都制定了严格的排放标准。作为一种不可或缺的含油污水处理技术，浮选技术因其成熟性、经济性、实用性和相对效率而备受关注。首先，本文总结并比较了近年来在海上采出水处理中广泛应用的浮选技术，如溶解气浮选、诱导气浮、电浮选和紧凑型浮选装置。考虑到气浮除油机理的复杂性，进一步探讨了油滴 - 气泡相互作用的机理。从微观胶体界面的角度总结了絮凝剂、pH值和盐度对浮选过程中油滴 - 气泡相互作用的影响，这对提高气浮过程中的除油效率具有特定的指导作用。最后，总结了气浮处理采出水的研究现状，并提出了可行的研究方向。
