Abstract
Oily wastewater discharge from various industry processes and activities have caused dramatic impacts on the human and environment. Treatment of oily wastewater using membrane technology has gained worldwide attention due to its efficiency in removing the amount and concentration of oil and grease as well as other specific pollutants in order to be reused or to fulfill stringent discharge standard. The application of thin film composite (TFC) membrane in reverse osmosis (RO) and forward osmosis (FO) for oily wastewater treatment is an emerging and exciting alternative in this field. This review presents the recent and distinctive development of TFC membranes to address the issues related to oily wastewater treatment. The recent advances in terms of TFC membrane design and separation performance evaluation are reviewed. This article aims to provide useful information and strategies, in both scientific knowledge advancement and practical implementation point of view, for the application TFC membrane for oily wastewater treatment.
Highlights
Pollution by oily wastewater, which is known as produced water, has become one of the major worldwide issues as the consequences of rapid industrialization in oil and gas, petrochemical and metallurgical industries [1]
When the oil emulsion was stabilized with cationic surfactant dodecyltrimethylammonium bromide (DTAB), the lowest critical flux was achieved as the weak oil–oil repulsion has resulted in the extensive coalescence of the oil droplets
Water recovery up to 80% was achieved upon simple water rinsing, indicating excellent antifouling performance, which was consistent to its superhydrophilic and underwater superoleophobic properties of the modified thin film composite (TFC) membranes
Summary
Pollution by oily wastewater, which is known as produced water, has become one of the major worldwide issues as the consequences of rapid industrialization in oil and gas, petrochemical and metallurgical industries [1]. Flotation has been conventionally used due to its high processing capacity and separation efficiency despite some significant disadvantages such as high-energy consumption Another commonly used method to treat oily wastewater is coagulation, which is known to be efficient in removing emulsified and dissolved oil, as well as some non-biodegradable organic compounds that co-exist in the wastewater [12]. Emerging membrane processes such as forward osmosis (FO) and membrane distillation (MD) have gained attention for more sustainable oily wastewater treatment The former osmotically-driven process exhibits energy efficiency and lower fouling propensity in the absence of hydraulic pressure [19,20], and the latter thermal-driven process is known as a green technology where low-grade waste heat can be harnessed for its operation [21]. The challenges and future outlook of this field are reviewed before the conclusion is drawn
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