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Zhang T, Li C, Sun S. Effect of Temperature on Oil–Water Separations Using Membranes in Horizontal Separators. MEMBRANES 2022; 12:membranes12020232. [PMID: 35207153 PMCID: PMC8879186 DOI: 10.3390/membranes12020232] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/27/2021] [Revised: 02/11/2022] [Accepted: 02/14/2022] [Indexed: 11/16/2022]
Abstract
The effect of temperature on oil–water separations is studied in this paper, focusing on the changed penetration velocities of water droplets on the separation membrane in a horizontal separator. A compact numerical scheme is developed based on the phase-field model, and the temperature effect is first theoretically analyzed regarding the key thermodynamic properties that may affect the separation performance. The computational scenario is designed based on practical horizontal separators in the oil field, and the droplet motions in the oil–water two-phase flow are simulated using our scheme under various operation conditions. It was found that a higher temperature may result in a faster penetration of the water droplets, and a larger density difference in the oil–water system is also preferred to accelerate the separation using membranes. Furthermore, increasing the operation temperature is proved to benefit the separation of water and heavy oil.
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Affiliation(s)
- Tao Zhang
- Computational Transport Phenomena Laboratory, Division of Physical Science and Engineering, King Abdullah University of Science and Technology, Thuwal 23955-6900, Saudi Arabia;
| | - Chenguang Li
- China National Oil and Gas Exploration and Development Company Limited, Beijing 100034, China;
| | - Shuyu Sun
- Computational Transport Phenomena Laboratory, Division of Physical Science and Engineering, King Abdullah University of Science and Technology, Thuwal 23955-6900, Saudi Arabia;
- Correspondence:
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Shi L, Huang J, Zeng G, Zhu L, Gu Y, Shi Y, Yi K, Li X. Roles of surfactants in pressure-driven membrane separation processes: a review. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2019; 26:30731-30754. [PMID: 31494849 DOI: 10.1007/s11356-019-06345-x] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/02/2019] [Accepted: 08/28/2019] [Indexed: 06/10/2023]
Abstract
Surfactants widely exist in various kinds of wastewaters which could be treated by pressure-driven membrane separation (PDMS) techniques. Due to the special characteristics of surfactants, they may affect the performance of membrane filtration. Over the last two decades, there are a number of studies on treating wastewaters containing surfactants by PDMS. The current paper gives a review of the roles of surfactants in PDMS processes. The effects of surfactants on membrane performance were discussed via two aspects: influence of surfactants on membrane fouling and enhanced removal of pollutants by surfactants. The characteristics of surfactants in solution and at solid-liquid interface were summarized. Surfactants in membrane filtration processes cause membrane fouling mainly through adsorption, concentration polarization, pore blocking, and cake formation, and fouling degree may be influenced by various factors (feed water composition, membrane properties, and operation conditions). Furthermore, surfactants may also have a positive effect on membrane performance. Enhanced removal of various kinds of pollutants by PDMS in the presence of surfactants has been summarized, and the removal mechanism has been revealed. Based on the current reports, further studies on membrane fouling caused by surfactants and enhanced removal of pollutants by surfactant-aided membrane filtration were also proposed.
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Affiliation(s)
- Lixiu Shi
- College of Environmental Science and Engineering, Hunan University, Changsha, 410082, Hunan, China
- Key Laboratory of Environmental Biology and Pollution Control, Ministry of Education, Hunan University, Changsha, 410082, Hunan, China
| | - Jinhui Huang
- College of Environmental Science and Engineering, Hunan University, Changsha, 410082, Hunan, China.
- Key Laboratory of Environmental Biology and Pollution Control, Ministry of Education, Hunan University, Changsha, 410082, Hunan, China.
| | - Guangming Zeng
- College of Environmental Science and Engineering, Hunan University, Changsha, 410082, Hunan, China.
- Key Laboratory of Environmental Biology and Pollution Control, Ministry of Education, Hunan University, Changsha, 410082, Hunan, China.
| | - Lei Zhu
- College of Environmental Science and Engineering, Hunan University, Changsha, 410082, Hunan, China
- Key Laboratory of Environmental Biology and Pollution Control, Ministry of Education, Hunan University, Changsha, 410082, Hunan, China
| | - Yanling Gu
- College of Environmental Science and Engineering, Hunan University, Changsha, 410082, Hunan, China
- Key Laboratory of Environmental Biology and Pollution Control, Ministry of Education, Hunan University, Changsha, 410082, Hunan, China
| | - Yahui Shi
- College of Environmental Science and Engineering, Hunan University, Changsha, 410082, Hunan, China
- Key Laboratory of Environmental Biology and Pollution Control, Ministry of Education, Hunan University, Changsha, 410082, Hunan, China
| | - Kaixin Yi
- College of Environmental Science and Engineering, Hunan University, Changsha, 410082, Hunan, China
- Key Laboratory of Environmental Biology and Pollution Control, Ministry of Education, Hunan University, Changsha, 410082, Hunan, China
| | - Xue Li
- Department of Bioengineering and Environmental Science, Changsha University, Changsha, 410003, Hunan, China
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