Abstract
In this study, alumina ceramic plate microfiltration membranes (ACMs) were used for the treatment of oily wastewater with different concentrations. The permeate oil concentration of the system was basically less than 5 mg·L−1, and the oil rejection rate was up to 97.6%. The effects of raw oil concentration on permeation flux and oil rejection rate of oily wastewater were studied. The results showed that with the increase of raw oil concentration, the oil rejection rate increased slightly due to the existence of oil film on the surface of filtered ACMs. Moreover, the existence of oil film had little effect on the flux change of ceramic membranes. The results showed that the permeability of ACMs mainly depended on their own oleophobic properties. In this system, physical cleaning technology is used to remove oil droplets and particles blocked in membrane pores. The results showed that physical cleaning could significantly recover the permeation flux as well as improve the oil rejection rate. On this basis, a system is proposed as a potential technique for oily wastewater treatment.
Highlights
Accepted: 11 January 2022Oily wastewater is found in large volumes as a result of oil spill accidents and various industries such as oil and gas extraction, food industry, and metal manufacturing [1,2]
alumina ceramic plate microfiltration membranes (ACMs) were successfully applied to the treatment of oily wastewater
The results showed that ceramic membrane had good permeation fluxPore andBlocking good oil Blocking rejection rate on low concentration oily wastewater
Summary
Accepted: 11 January 2022Oily wastewater is found in large volumes as a result of oil spill accidents and various industries such as oil and gas extraction, food industry, and metal manufacturing [1,2]. The widespread existence of emulsified oil makes it difficult to treat oily wastewater by traditional methods, for instance, gravity separation, biological degradation, hydrocyclone, air flotation, and the skimmers [7,8,9,10]. The treatment of oily wastewater using routine processes renders it difficult to reach the standard of low energy consumption and high efficiency, due to the limitations of low efficiency, high energy consumption, and secondary pollution. It is very necessary for environmental safety and human health to develop environmentally friendly, economical, and efficient oil-water emulsion treatment technologies
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