Inicio  /  Water  /  Vol: 15 Par: 14 (2023)  /  Artículo
ARTÍCULO
TITULO

Catalytic Performance of Fe-Rich Sludge in Pyrolysis of Waste Oil Scum as Volatiles and Magnetic Char

Jiancong Liu    
Manhong Ji    
Jiabao Qin    
Jia Zhu and Suiyi Zhu    

Resumen

Waste oil scum is commonly discharged during the air flotation process at oil-bearing wastewater treatment plants and disposed as an additive in cement kilns and/or furnaces. Herein, it was mixed with a magnetite-rich waste sludge and then completely recycled as value-added gas/oil and magnetic char via a facile catalytic pyrolysis route. Results showed that the oil scum was a blackish gel and contained 36.2% water, 52.5% tar, and 11.3% inorganics. After direct pyrolysis, the conversion efficiencies of tar to gas, oil, and char were 30.2%, 41.2%, and 28.6%, respectively, and the generated gas/oil was rich in aromatics. By adding Fe-rich sludge, the efficiencies varied to 57.3%, 26.9%, and 15.8%, respectively, and the gas/oil mainly comprised a chain hydrocarbon. During oil scum pyrolysis, the redox reaction of tar to Fe-rich sludge enabled a cycle of Fe/magnetite to accelerate the cleavage of tar as volatiles and to steadily retard the polycondensation of tar as char. In addition, the added Fe-rich sludge not only activated the rest of the char and created more surface functional groups for contaminant adsorption but also endowed the char with a good magnetic response. Such magnetic char showed a maximum adsorption capacity of ciprofloxacin of 63.5 mg/g, higher than that without the Fe-sludge catalyst, and had ability to selectively adsorb ciprofloxacin from benzoic/sulfanilamide-bearing wastewater. In summary, a ?waste to treat waste? strategy was developed to recycle waste oil scum as combustible gas/oil and magnetic char with the addition of magnetite-rich sludge.

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